Metsähovi Radio Observatory

2026

A long-term multiwavelength study of the flat spectrum radio quasar OP 313

Bartolini, C., Lindfors, E., Tramacere, A., Giroletti, M., Cerasole, D., Agudo, I., Angelakis, E., Bissaldi, E., Casaburo, F., D’Ammando, F., Di Venere, L., Fallah Ramazani, V., Giacchino, F., Giordano, F., Gurwell, M., Jormanainen, J., Jorstad, S., Keating, G., Kouch, P. M. & Kraus, A. & 8 others, Lähteenmäki, A., Loporchio, S., Marchili, N., Marscher, A., Myserlis, I., Rao, R., Righini, S. & Tornikoski, M., 1 Mar 2026, In: Astronomy and Astrophysics. 707, A136.

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A Search for Supermassive Black Hole Binary Candidates in 46 yr Radio Light Curves of 83 Blazars

Molina, B., Mroz, P., De la Parra, P. V., Readhead, A. C. S., Surti, T., Aller, M. F., Scargle, J. D., Reeves, R. A., Aller, H., Begelman, M. C., Blandford, R. D., Ding, Y., Graham, M. J., Harrison, F., Hovatta, T., Liodakis, I., Lister, M. L., Max-Moerbeck, W., Pavlidou, V. & Pearson, T. J. & 6 others, Ravi, V., Sullivan, A. G., Synani, A., Tassis, K., Tremblay, S. E. & Zensus, J. A., 20 Mar 2026, In: Astrophysical Journal. 1000, 1, p. 1-16 16 p., 72.

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Compelling Evidence for a Harmonic in the Light Curve of the Supermassive Black Hole Binary Candidate PKS J1309+1154

Readhead, A. C. S., Aller, M. F., Sullivan, A. G., Blandford, R. D., Mroz, P., De La Parra, P. V., Molina, B., Most, E. R., Synani, A., Aller, H., Begelman, M. C., Ding, Y., Graham, M. J., Harrison, F., Hovatta, T., Liodakis, I., Max-Moerbeck, W., Pavlidou, V., Pearson, T. J. & Ravi, V. & 5 others, Reeves, R. A., Surti, T., Tassis, K., Tremblay, S. E. & Zensus, J. A., 10 Jan 2026, In: Astrophysical Journal Letters. 996, 2, 10 p., L39.

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First detection of VHE gamma-ray signal from the FSRQ TON 0599

Lähteenmäki, A., Tornikoski, M. & MAGIC Collaboration, 1 Mar 2026, In: Monthly Notices of the Royal Astronomical Society. 546, 4, stag032.

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Insights into jet–NLR energetics in PMN J0948+0022

Dalla Barba, B., Foschini, L., Berton, M., Lähteenmäki, A., Tornikoski, M., Sani, E., Crepaldi, L., Congiu, E., Venturi, G., Hon, W. J. & Vietri, A., 2026, In: Contributions of the Astronomical Observatory Skalnate Pleso. 56, 1, p. 43-51 9 p.

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Massive stars exploding in a He-rich circumstellar medium: XII. SN 2024acyl: A fast, linearly declining Type Ibn supernova with early flash-ionisation features

Cai, Y. Z., Pastorello, A., Maeda, K., Zhao, J. W., Wang, Z. Y., Peng, Z. H., Reguitti, A., Tartaglia, L., Filippenko, A. V., Pan, Y., Valerin, G., Kumar, B., Wang, Z., Fraser, M., Anderson, J. P., Benetti, S., Bose, S., Brink, T. G., Cappellaro, E. & Chen, T. W. & 46 others, Chen, X. L., Elias-Rosa, N., Esamdin, A., Gal-Yam, A., González-Bañuelos, M., Gromadzki, M., Gutiérrez, C. P., Inserra, C., Iskandar, A., Kangas, T., Kankare, E., Kravtsov, T., Kuncarayakti, H., Li, L. P., Liu, C. X., Liu, X. K., Lundqvist, P., Matilainen, K., Mattila, S., Moran, S., Müller-Bravo, T. E., Nagao, T., Petrushevska, T., Pignata, G., Salmaso, I., Smartt, S. J., Sollerman, J., Srivastav, S., Stritzinger, M. D., Wang, L. T., Yan, S. Y., Yang, Y., Yang, Y. P., Zheng, W., Zou, X. Z., Chen, L. Y., Du, X. L., Fang, Q. L., Fiore, A., Ragosta, F., Zha, S., Zhang, J. J., Liu, X. W., Bai, J. M., Wang, B. & Wang, X. F., 1 Mar 2026, In: Astronomy and Astrophysics. 707, A157.

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Peculiar SN Ic 2022esa : An explosion of a massive Wolf–Rayet star in a binary as a precursor to a BH–BH binary?

Maeda, K., Kuncarayakti, H., Nagao, T., Kawabata, M., Taguchi, K., Uno, K. & De, K., 1 Feb 2026, In: Publications of the Astronomical Society of Japan. 78, 1, p. L1-L7

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Probing jet base emission of M87* with the 2021 Event Horizon Telescope observations

Ramakrishnan, V., Savolainen, T., Wiik, K. & Event Horizon Telescope Collaboration, 1 Feb 2026, In: Astronomy and Astrophysics. 706, A27.

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SN 2023gpw: Exploring the diversity and power sources of hydrogen-rich superluminous supernovae

Kangas, T., Charalampopoulos, P., Nagao, T., Yan, L., Stritzinger, M., Schulze, S., Das, K., Elias-Rosa, N., Fremling, C., Perley, D., Sollerman, J., Müller-Bravo, T. E., Galbany, L., Groom, S. L., Gutiérrez, C. P., Kasliwal, M. M., Kotak, R., Laher, R. R., Lundqvist, P. & Mattila, S. & 1 others, Smith, R., 6 Jan 2026, In: Astronomy and Astrophysics. 705, 28 p., A52.

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SN 2024cld: unveiling the complex mass-loss histories of evolved supergiant progenitors to core collapse supernovae

Killestein, T. L., Pursiainen, M., Kotak, R., Charalampopoulos, P., Lyman, J., Ackley, K., Belkin, S., Coppejans, D. L., Davies, B., Dyer, M. J., Galbany, L., Godson, B., Jarvis, D., Koivisto, N., Kumar, A., Magee, M., Mitchell, M., O’Neill, D., Sahu, A. & Warwick, B. & 35 others, Breton, R. P., Butterley, T., 蔡永志, Casares, J., Dhillon, V. S., Elias-Rosa, N., Fraser, M., Galloway, D. K., Gompertz, B., González-Bañuelos, M., Gutiérrez, C. P., Kangas, T., Kankare, E., Kelsey, L., Kravtsov, T., Leloudas, G., Littlefair, S. P., Matilainen, K., Mattila, S., Nagao, T., Noysena, K., Nuttall, L. K., O’Brien, P., Pollacco, D., Ramsay, G., Reguitti, A., Reynolds, T. M., Salmaso, I., Starling, R. L. C., Steeghs, D., Stritzinger, M., Ulaczyk, K., Valerin, G., Wang, Z. & Wilson, R., May 2026, In: Monthly Notices of the Royal Astronomical Society. 548, 2

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Spatially resolved polarization swings in the supermassive binary black hole candidate OJ 287 with first Event Horizon Telescope observations

Ramakrishnan, V., Savolainen, T., Wiik, K. & Event Horizon Telescope Collaboration, 1 Jan 2026, In: Astronomy and Astrophysics. 705, A23.

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The hydrogen-free circumstellar interaction in the Type Ib supernova 2021efd : A clue to the mechanism of the helium-layer stripping

Pyykkinen, N., Nagao, T., Kuncarayakti, H., Stritzinger, M. D., Kangas, T., Maeda, K., Chen, P., Sollerman, J., Burns, C., Bose, S., Folatelli, G., Ferrari, L., Morrell, N., Reguitti, A., Salmaso, I., Mattila, S., Gal-Yam, A., Fremling, C., Anand, S. & Kasliwal, M. M. & 10 others, Gutierrez, C. P., Galbany, L., Hoogendam, W., Schulze, S., Ashall, C., Medler, K., Pfeffer, C. M., Lundqvist, P., Rusholme, B. & Adler, J., 10 Feb 2026, In: Astronomy & Astrophysics. 706, p. 1-16 16 p., A183.

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2025

Accessing a New Population of Supermassive Black Holes with Extensions to the Event Horizon Telescope

Zhang, X. A., Ricarte, A., Pesce, D. W., Johnson, M. D., Nagar, N., Narayan, R., Ramakrishnan, V., Doeleman, S., Palumbo, D. C. M. & Event Horizon Telescope Collaboration, 20 May 2025, In: Astrophysical Journal. 985, 1, 41.

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7 Citations (Scopus)

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A comprehensive radio study of narrow-line Seyfert 1 galaxies

Varglund, I., Järvelä, E., Hardcastle, M. J., Varglund, S. & Lähteenmäki, A., 1 Nov 2025, In: Astronomy & Astrophysics. 703, A202.

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1 Citation (Web of Science)

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Active galactic nucleus time-variability analysis and its caveats

Kankkunen, S., Tornikoski, M. & Hovatta, T., 1 Jan 2025, In: Astronomy & Astrophysics. 693, 14 p., A319.

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6 Citations (Scopus)

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A multifrequency study of sub-parsec jets with the Event Horizon Telescope

Savolainen, T., Ramakrishnan, V., Wiik, K. & Event Horizon Telescope Collaboration, 1 Mar 2025, In: Astronomy & Astrophysics. 695, 21 p., A233.

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9 Citations (Web of Science)

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A real-time search for Type Ia Supernovae with late-time interactions with circumstellar material in ZTF data

Terwel, J. H., Maguire, K., Brennan, S. J., Galbany, L., Reusch, S., Schulze, S., Koivisto, N., Pursimo, T., Grund Sørensen, S., Díaz Teodori, M. A., Guldberg Theil, A., Turkki, M., Müller-Bravo, T. E., Burgaz, U., Kim, Y. L., Bloom, J. S., Graham, M. J., Kasliwal, M. M., Kulkarni, S. R. & Masci, F. J. & 3 others, Purdum, J., Pyshna, O. & Wold, A., 1 Oct 2025, In: Astronomy & Astrophysics. 702, 17 p., A21.

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2 Citations (Scopus)

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A Two-week IXPE Monitoring Campaign on Mrk 421

Maksym, W. P., Liodakis, I., Saade, M. L., Kim, D. E., Middei, R., Di Gesu, L., Kiehlmann, S., Matzeu, G., Agudo, I., Marscher, A. P., Ehlert, S. R., Jorstad, S. G., Kaaret, P., Marshall, H. L., Pacciani, L., Perri, M., Puccetti, S., Kouch, P. M., Lindfors, E. & Aceituno, F. J. & 137 others, Bonnoli, G., Casanova, V., Escudero, J., Gómez, J. L., Agís-González, B., Husillos, C., Morcuende, D., Santos, J. O., Sota, A., Piirola, V., Imazawa, R., Sasada, M., Fukazawa, Y., Kawabata, K. S., Uemura, M., Mizuno, T., Nakaoka, T., Akitaya, H., McCall, C., Jermak, H. E., Steele, I. A., Borman, G. A., Grishina, T. S., Hagen-Thorn, V. A., Kopatskaya, E. N., Larionova, E. G., Morozova, D. A., Savchenko, S. S., Shishkina, E. V., Troitskiy, I. S., Troitskaya, Y. V., Vasilyev, A. A., Zhovtan, A. V., Myserlis, I., Gurwell, M., Keating, G., Rao, R., Pauley, C., Angelakis, E., Kraus, A., Berdyugin, A. V., Kagitani, M., Kravtsov, V., Poutanen, J., Sakanoi, T., Kang, S., Lee, S. S., Kim, S. H., Cheong, W. Y., Jeong, H. W., Song, C., Blinov, D., Shablovinskaya, E., Antonelli, L. A., Bachetti, M., Baldini, L., Baumgartner, W. H., Bellazzini, R., Bianchi, S., Bongiorno, S. D., Bonino, R., Brez, A., Bucciantini, N., Capitanio, F., Castellano, S., Cavazzuti, E., Chen, C. T., Ciprini, S., Costa, E., De Rosa, A., Del Monte, E., Di Lalla, N., Di Marco, A., Donnarumma, I., Doroshenko, V., Dovčiak, M., Enoto, T., Evangelista, Y., Fabiani, S., Ferrazzoli, R., Garcia, J. A., Gunji, S., Hayashida, K., Heyl, J., Iwakiri, W., Karas, V., Kislat, F., Kitaguchi, T., Kolodziejczak, J. J., Krawczynski, H., La Monaca, F., Latronico, L., Maldera, S., Manfreda, A., Marin, F., Marinucci, A., Massaro, F., Matt, G., Mitsuishi, I., Muleri, F., Negro, M., Ng, C. Y., O’Dell, S. L., Omodei, N., Oppedisano, C., Papitto, A., Pavlov, G. G., Peirson, A. L., Pesce-Rollins, M., Petrucci, P. O., Pilia, M., Possenti, A., Ramsey, B. D., Rankin, J., Ratheesh, A., Roberts, O. J., Romani, R. W., Sgró, C., Slane, P., Soffitta, P., Spandre, G., Swartz, D. A., Tamagawa, T., Tavecchio, F., Taverna, R., Tawara, Y., Tennant, A. F., Thomas, N. E., Tombesi, F., Trois, A., Tsygankov, S. S., Turolla, R., Vink, J., Weisskopf, M. C., Wu, K., Xie, F. & Zane, S., 20 Jun 2025, In: Astrophysical Journal. 986, 2, 20 p., 230.

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2 Citations (Web of Science)

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Characterization of Markarian 421 during its most violent year: Multiwavelength variability and correlations

Lähteenmäki, A., Tornikoski, M., MAGIC Collaboration, VERITAS Collaboration & Fermi Large Area Telescope Collaboration, 1 Feb 2025, In: Astronomy & Astrophysics. 694, 20 p., A195.

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9 Citations (Scopus)

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Detection of Compton Scattering in the Jet of 3C 84

Liodakis, I., Chakraborty, S., Marin, F., Ehlert, S. R., Barnouin, T., Kouch, P. M., Nilsson, K., Lindfors, E., Pursimo, T., Paraschos, G. F., Middei, R., Falcão, A. T., Jorstad, S., Agudo, I., Kovalev, Y. Y., Casey, J. J., Gesu, L. D., Kaaret, P., Kim, D. E. & Kislat, F. & 60 others, Ratheesh, A., Saade, M. L., Tombesi, F., Marscher, A., Aceituno, F. J., Bonnoli, G., Casanova, V., Emery, G., Pedrosa, J. E., Morcuende, D., Otero-Santos, J., Sota, A., Piirola, V., Bachev, R., Strigachev, A., Borman, G. A., Grishina, T. S., Hagen-Thorn, V. A., Kopatskaya, E. N., Larionova, E. G., Morozova, D. A., Savchenko, S. S., Shishkina, E. V., Troitskiy, I. S., Troitskaya, Y. V., Vasilyev, A. A., Zhovtan, A. V., Myserlis, I., Gurwell, M., Keating, G., Rao, R., Kang, S., Lee, S. S., Kim, S., Cheong, W. Y., Jeong, H. W., Song, C., Li, S., Nam, M. S., Álvarez-Ortega, D., Casadio, C., Angelakis, E., Kraus, A., Jormanainen, J., Ramazani, V. F., Chen, C. T., Costa, E., Churazov, E., Ferrazzoli, R., Galanti, G., Khabibullin, I., O’Dell, S. L., Pacciani, L., Roncadelli, M., Roberts, O. J., Soffitta, P., Swartz, D. A., Tavecchio, F., Weisskopf, M. C. & Zhuravleva, I., 20 Nov 2025, In: Astrophysical Journal Letters. 994, 1, p. 1-15 15 p., L9.

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Determining the origin of the X-ray emission in blazars through multiwavelength polarization

Liodakis, I., Zhang, H., Boula, S., Middei, R., Otero-Santos, J., Blinov, D., Agudo, I., Böttcher, M., Chen, C. T., Ehlert, S. R., Jorstad, S. G., Kaaret, P., Krawczynski, H., Peirson, A. L., Romani, R. W., Tavecchio, F., Weisskopf, M. C., Kouch, P. M., Lindfors, E. & Nilsson, K. & 31 others, McCall, C., Jermak, H. E., Steele, I. A., Myserlis, I., Gurwell, M., Keating, G. K., Rao, R., Kang, S., Lee, S. S., Kim, S., Cheong, W. Y., Jeong, H. W., Angelakis, E., Kraus, A., Aceituno, F. J., Bonnoli, G., Casanova, V., Escudero, J., Agís-González, B., Morcuende, D., Sota, A., Bachev, R., Grishina, T. S., Kopatskaya, E. N., Larionova, E. G., Morozova, D. A., Savchenko, S. S., Shishkina, E. V., Troitskiy, I. S., Troitskaya, Y. V. & Vasilyev, A. A., 1 Jun 2025, In: Astronomy & Astrophysics. 698, L19.

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5 Citations (Web of Science)

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Drone localization in GNSS-denied environments: Addressing the impacts of hardware imperfections, RIS assistance, and jammer nullification

Meles, M. B., 2025, Aalto University. 141 p.

Research output: Thesis › Doctoral Thesis › Collection of Articles

Open Access

First polarization study of the M87 jet and active galactic nuclei at submillimeter wavelengths with ALMA

Ramakrishnan, V., Savolainen, T., Wiik, K. & Event Horizon Telescope Collaboration, 1 Jul 2025, In: Astronomy & Astrophysics. 699, A265.

Research output: Contribution to journal › Article › Scientific › peer-review

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5 Citations (Scopus)

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Galactic transient sources with the Cherenkov Telescope Array Observatory

Abe, K., Abe, S., Abhir, J., Abhishek, A., Acero, F., Acharyya, A., Adam, R., Aguasca-Cabot, A., Agudo, I., Aguirre-Santaella, A., Alfaro, J., Alfaro, R., Alvarez-Crespo, N., Alves Batista, R., Amans, J.-P., Amato, E., Ambrosi, G., Ambrosino, F., Anguner, E. O. & Antonelli, L. A. & 31 others, Aramo, C., Arcaro, C., Arnesen, T. T. H., Asano, K., Ascasibar, Y., Aschersleben, J., Ashkar, H., Augusto Stuani, L., Baack, D., Backes, M., Balazs, C., Balbo, M., Baquero Larriva, A., Barbosa Martins, V., Chen, A. W., Dai, S., Gonzalez, M. M., Hovatta, T., Jin, W., Lindfors, E., Martinez, G. A., Miranda, J. M., Nayak, A., Rocha, L. S., Romeo, G., Sarkar, A., Tian, W. W., Will, M., Yang, L., Zhang, W. & Cherenkov Telescope Array Observatory Consortium, Jun 2025, In: Monthly Notices of the Royal Astronomical Society. 540, 1, p. 205-238 34 p.

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3 Citations (Web of Science)

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Gamma-ray flares from the jet of the blazar CTA 102 in 2016–2018

Kim, S., Lee, S. S., Algaba, J. C., Rani, B., Park, J., Jeong, H. W., Cheong, W. Y., D’Ammando, F., Lähteenmäki, A., Tornikoski, M., Tammi, J., Ramakrishnan, V., Agudo, I., Casadio, C., Escudero, J., Fuentes, A., Traianou, E., Myserlis, I. & Thum, C., 1 Feb 2025, In: Astronomy & Astrophysics. 694, A291.

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1 Citation (Scopus)

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High Optical-to-X-Ray Polarization Ratio Reveals Compton Scattering in BL Lacertae’s Jet

Agudo, I., Liodakis, I., Otero-Santos, J., Middei, R., Marscher, A., Jorstad, S., Zhang, H., Li, H., Di Gesu, L., Romani, R. W., Kim, D. E., Fenu, F., Marshall, H. L., Pacciani, L., Pedrosa, J. E., Aceituno, F. J., Agís-González, B., Bonnoli, G., Casanova, V. & Morcuende, D. & 130 others, Piirola, V., Sota, A., Kouch, P. M., Lindfors, E., McCall, C., Jermak, H. E., Steele, I. A., Borman, G. A., Grishina, T. S., Hagen-Thorn, V. A., Kopatskaya, E. N., Larionova, E. G., Morozova, D. A., Savchenko, S. S., Shishkina, E. V., Troitskiy, I. S., Troitskaya, Y. V., Vasilyev, A. A., Zhovtan, A. V., Myserlis, I., Gurwell, M., Keating, G., Rao, R., Kang, S., Lee, S. S., Kim, S., Cheong, W. Y., Jeong, H. W., Angelakis, E., Kraus, A., Blinov, D., Maharana, S., Bachev, R., Jormanainen, J., Nilsson, K., Fallah Ramazani, V., Casadio, C., Fuentes, A., Traianou, E., Thum, C., Gómez, J. L., Antonelli, L. A., Bachetti, M., Baldini, L., Baumgartner, W. H., Bellazzini, R., Bianchi, S., Bongiorno, S. D., Bonino, R., Brez, A., Bucciantini, N., Capitanio, F., Castellano, S., Cavazzuti, E., Chen, C. T., Ciprini, S., Costa, E., De Rosa, A., Del Monte, E., Di Lalla, N., Di Marco, A., Donnarumma, I., Doroshenko, V., Dovčiak, M., Ehlert, S. R., Enoto, T., Evangelista, Y., Fabiani, S., Ferrazzoli, R., García, J. A., Gunji, S., Hayashida, K., Heyl, J., Iwakiri, W., Kaaret, P., Karas, V., Kislat, F., Kitaguchi, T., Kolodziejczak, J. J., Krawczynski, H., La Monaca, F., Latronico, L., Maldera, S., Manfreda, A., Marin, F., Marinucci, A., Massaro, F., Matt, G., Mitsuishi, I., Mizuno, T., Muleri, F., Negro, M., Ng, C. Y., O’Dell, S. L., Omodei, N., Oppedisano, C., Papitto, A., Pavlov, G. G., Peirson, A. L., Perri, M., Pesce-Rollins, M., Petrucci, P. O., Pilia, M., Possenti, A., Poutanen, J., Puccetti, S., Ramsey, B. D., Rankin, J., Ratheesh, A., Roberts, O. J., Sgrò, C., Slane, P., Soffitta, P., Spandre, G., Swartz, D. A., Tamagawa, T., Tavecchio, F., Taverna, R., Tawara, Y., Tennant, A. F., Thomas, N. E., Tombesi, F., Trois, A., Tsygankov, S. S., Turolla, R., Vink, J., Weisskopf, M. C., Wu, K., Xie, F. & Zane, S., 20 May 2025, In: Astrophysical Journal Letters. 985, 1, 18 p., L15.

Research output: Contribution to journal › Article › Scientific › peer-review

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10 Citations (Web of Science)

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Horizon-scale variability of M87* from 2017–2021 EHT observations

Ramakrishnan, V., Savolainen, T., Wiik, K. & Event Horizon Telescope Collaboration, 1 Dec 2025, In: Astronomy & Astrophysics. 704, A91.

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6 Citations (Web of Science)

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Insight into the Jet Emission Properties from Long-Term Monitoring of the TeV Blazar PG 1553+113

Hovatta, T. & MAGIC Collaboration, 30 Dec 2025, In: POS Proceedings of Science. 501, 8 p., 813.

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Instrumental and systematic effects in VGOS differential ionospheric total electron content

Zubko, N., Xu, M. H., Kareinen, N., Savolainen, T. & Poutanen, M., 1 Oct 2025, In: Advances in Space Research. 76, 7, p. 3914-3930 17 p.

Research output: Contribution to journal › Article › Scientific › peer-review

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1 Citation (Scopus)

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Keplerian molecular gas disk and black hole mass of NGC 4751

Osorno, J., Nagar, N., Richtler, T., Ramakrishnan, V., Finlez, C., Messias, H., Gültekin, K., Gebhardt, K. & Teuben, P., 1 Mar 2025, In: Astronomy & Astrophysics. 695, 15 p., A72.

Research output: Contribution to journal › Article › Scientific › peer-review

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1 Citation (Scopus)

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Long term multi-wavelength analysis of the flat spectrum radio quasar OP 313

Lähteenmäki, A., Tornikoski, M. & Fermi Large Area Telescope Collaboration, 2025, In: Il Nuovo Cimento C. 48, 4, 214.

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Long-term multi-wavelength analysis of the FSRQ OP 313

Bartolini, C., Lindfors, E., Giroletti, M., Tramacere, A., Giacchino, F., Casaburo, F., Cerasole, D., Myserlis, I., Lähteenmäki, A., Tornikoski, M., D’Ammando, F., Marchili, N., Righini, S., Angelakis, E., Kraus, A., Rao, R., Gurwell, M., Keating, G., Agudo, I. & Marscher, A. & 5 others, Jorstad, S., Bissaldi, E., Di Venere, L., Giordano, F. & Loporchio, S., 30 Dec 2025, In: POS Proceedings of Science. 501, 565.

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Long-term radio variability of active galactic nuclei at 37 GHz

Kankkunen, S., Tornikoski, M., Hovatta, T. & Lähteenmäki, A., 1 Jan 2025, In: Astronomy & Astrophysics. 693, 22 p., A318.

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6 Citations (Scopus)

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Looking into the jet cone of the neutrino-associated very high-energy blazar PKS 1424+240

Kovalev, Y. Y., Pushkarev, A. B., Gómez, J. L., Homan, D. C., Lister, M. L., Livingston, J. D., Pashchenko, I. N., Plavin, A. V., Savolainen, T. & Troitsky, S. V., 1 Aug 2025, In: Astronomy & Astrophysics. 700, L12.

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Modeling the Multiwavelength Emission of 3C 279 during the 14 yr Fermi-LAT Era

Mohana A, K., Gupta, A. C., Fan, J., Sahakyan, N., Raiteri, C. M., Cui, L., Lähteenmäki, A., Gurwell, M., Tornikoski, M. & Villata, M., 10 Aug 2025, In: Astrophysical Journal. 989, 1, 125.

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MOJAVE – XXII. Brightness temperature distributions and geometric profiles along parsec-scale active galactic nucleus jets

Savolainen, T., Fermi Large Area Telescope Collaboration & MOJAVE Team, 1 Apr 2025, In: Monthly Notices of the Royal Astronomical Society. 538, 3, p. 2008-2030 23 p.

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Multi-epoch leptohadronic modeling of neutrino source candidate blazar PKS 0735+178

Omeliukh, A., Garrappa, S., Ramazani, V. F., Franckowiak, A., Winter, W., Lindfors, E., Nilsson, K., Jormanainen, J., Wierda, F., Filippenko, A. V., Zheng, W., Tornikoski, M., Lahteenmaki, A., Kankkunen, S. & Tammi, J., 27 Mar 2025, In: Astronomy & Astrophysics. 695, p. 1-15 15 p., A266.

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Multiwavelength study of OT 081: broadband modelling of a transitional blazar

Hovatta, T., Lähteenmäki, A., Tornikoski, M., Fermi Large Area Telescope Collaboration, MWL Collaborators , MAGIC Collaboration & VHE Gamma-ray collaborators, 1 Jun 2025, In: Monthly Notices of the Royal Astronomical Society. 540, 1, p. 364-384 21 p.

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Observational diversity of bright long-lived Type II supernovae

Nagao, T., Reynolds, T. M., Kuncarayakti, H., Cartier, R., Mattila, S., Maeda, K., Sollerman, J., Pessi, P. J., Anderson, J. P., Inserra, C., Chen, T. W., Ferrari, L., Fraser, M., Young, D. R., Gromadzki, M., Gutiérrez, C. P., Lundqvist, P., Pignata, G., Müller-Bravo, T. E. & Ragosta, F. & 5 others, Reguitti, A., Moran, S., González-Bañuelos, M., Kopsacheili, M. & Petrushevska, T., 1 Jul 2025, In: Astronomy & Astrophysics. 699, A283.

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Optical evolution of AT 2024wpp: the high-velocity outflows in Cow-like transients are consistent with high spherical symmetry

Pursiainen, M., Killestein, T. L., Kuncarayakti, H., Charalampopoulos, P., Warwick, B., Lyman, J., Kotak, R., Leloudas, G., Coppejans, D., Kravtsov, T., Maeda, K., Nagao, T., Taguchi, K., Ackley, K., Dhillon, V. S., Galloway, D. K., Kumar, A., O’Neill, D., Ramsay, G. & Steeghs, D., 1 Mar 2025, In: Monthly Notices of the Royal Astronomical Society. 537, 4, p. 3298-3309 12 p.

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Optimizing the hunt for extraterrestrial high-energy neutrino counterparts

Kouch, P. M., Lindfors, E., Hovatta, T., Liodakis, I., Koljonen, K. I. I., Nilsson, K., Jormanainen, J., Fallah Ramazani, V. & Graham, M. J., 1 Apr 2025, In: Astronomy & Astrophysics. 696, p. 1-22 22 p., A73.

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Origin of the ring ellipticity in the black hole images of M87

Wiik, K., Ramakrishnan, V., Savolainen, T., Event Horizon Telescope Collaboration & Freeman, W. T., 1 Jul 2025, In: Astronomy & Astrophysics. 699, A279.

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Pinpointing the location of the γ -ray emitting region in the FSRQ 4C +01.28

Rösch, F., Kadler, M., Ros, E., Ricci, L., Gurwell, M. A., Hovatta, T., Macdonald, N. R. & Readhead, A. C. S., 1 Dec 2025, In: Astronomy & Astrophysics. 704, A143.

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PKS 2131−021-Discovery of Strong Coherent Sinusoidal Variations from Radio to Optical Frequencies: Compelling Evidence for a Blazar Supermassive Black Hole Binary

Kiehlmann, S., de la Parra, P. V., Sullivan, A. G., Synani, A., Liodakis, I., Mróz, P., Næss, S. K., Readhead, A. C. S., Begelman, M. C., Blandford, R. D., Chatziioannou, K., Ding, Y., Graham, M. J., Harrison, F., Homan, D. C., Hovatta, T., Kulkarni, S. R., Lister, M. L., Maiolino, R. & Max-Moerbeck, W. & 14 others, Molina, B., O’Dea, C. P., Pavlidou, V., Pearson, T. J., Aller, M. F., Lawrence, C. R., Lazio, T. J. W., O’Neill, S., Prince, T. A., Ravi, V., Reeves, R. A., Tassis, K., Vallisneri, M. & Zensus, J. A., 20 May 2025, In: Astrophysical Journal. 985, 1, 22 p., 59.

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PKS J0805-0111: A Second Owens Valley Radio Observatory Blazar Showing Highly Significant Sinusoidal Radio Variability—The Tip of the Iceberg

de la Parra, P. V., Kiehlmann, S., Mróz, P., Readhead, A. C. S., Synani, A., Begelman, M. C., Blandford, R. D., Ding, Y., Harrison, F., Liodakis, I., Max-Moerbeck, W., Pavlidou, V., Reeves, R., Vallisneri, M., Aller, M. F., Graham, M. J., Hovatta, T., Lawrence, C. R., Lazio, T. J. W. & Mahabal, A. A. & 6 others, Molina, B., O’Neill, S., Pearson, T. J., Ravi, V., Tassis, K. & Zensus, J. A., 10 Jul 2025, In: Astrophysical Journal. 987, 2, 191.

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Revisiting 3C 279 jet morphology with space VLBI at 26 microarcsecond resolution

Toscano, T., Gómez, J. L., Zhao, G. Y., Lico, R., Fuentes, A., Savolainen, T., Röder, J., Wielgus, M., Pushkarev, A. B., Traianou, E., Zeng, A. L., Gurvits, L. I., Kovalev, Y. Y., Pötzl, F. M. & Lisakov, M., 1 Dec 2025, In: Astronomy & Astrophysics. 704, 12 p., A225.

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Shared-optical-path VLBI frequency phase transfer from 86 to 258 GHz on an 8600km baseline: Demonstrated with the APEX and IRAM 30m telescopes

Zhao, G. Y., Roy, A. L., Wagner, J. F., Donoso, E., Torne, P., Ros, E., Lindqvist, M., Lobanov, A. P., Ramakrishnan, V., Krichbaum, T. P., Rottmann, H., Zensus, J. A., Pérez-Beaupuits, J. P., Klein, B., Menten, K. M., Ricken, O., Reyes, N., Sánchez, S., Ruiz, I. & Durán, C. & 8 others, John, D., Santaren, J. L., Sánchez-Portal, M., Bremer, M., Kramer, C., Schuster, K. F., Rioja, M. J. & Dodson, R., 1 Sept 2025, In: Astronomy & Astrophysics. 701, A132.

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Spectral Energy Distribution Variability of the Blazar OJ 287 During 2009-2021

Zuo, W., Gupta, A. C., Gu, M., Valtonen, M. J., Jorstad, S. G., Aller, M. F., Lahteenmaki, A., Kiehlmann, S., Kushwaha, P., Aller, H. D., Chen, L., Readhead, A. C. S., Tornikoski, M. & Yuan, Q., 1 Feb 2025, In: Astrophysical Journal. 979, 2, 210.

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Spectropolarimetry of a Nuclear Transient AT2023clx: Revealing the Geometrical Alignment between the Transient Outflow and the Nuclear Dusty Region

Uno, K., Maeda, K., Nagao, T., Leloudas, G., Charalampopoulos, P., Mattila, S., Aoki, K., Taguchi, K., Kawabata, M., Moldon, J., Pérez-Torres, M., Pursiainen, M. & Reynolds, T., 20 Jun 2025, In: Astrophysical Journal Letters. 986, 2, L23.

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Spectropolarimetry of NGC 1275 reveals a narrow-line radio galaxy with polarization parallel to its radio jet axis

Marin, F., Pursimo, T., Liodakis, I., Lindfors, E., Biedermann, J., Hutsemékers, D. & Turkki, M., 1 Oct 2025, In: Astronomy & Astrophysics. 702, L16.

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Metsähovi Radio Observatory

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