TY - JOUR
T1 - Detection of persistent VHE gamma-ray emission from PKS 1510-089 by the MAGIC telescopes during low states between 2012 and 2017
AU - Acciari, V.A.
AU - Ansoldi, S.
AU - Antonelli, L. A.
AU - Engels, Arbet
AU - Arcaro, C.
AU - Baack, D.
AU - Babić, A.
AU - Banerjee, B.
AU - Bangale, P.
AU - Barres de Almeida, U.
AU - Barrio, J. A.
AU - Bednarek, W
AU - Bernardini, E.
AU - Berti, A
AU - Besenrieder, J
AU - Bhattacharyya, W
AU - Bigongiari, C.
AU - Biland, A
AU - Blanch, O
AU - Bonnoli, G
AU - Carosi, R
AU - Ceribella, G
AU - Cikota, S.
AU - Colak, S M
AU - Colin, P.
AU - Colombo, E.
AU - Contreras, J. L.
AU - Cortina, J.
AU - Covino, S.
AU - D’Elia, V
AU - Da Vela, P.
AU - Dazzi, F
AU - De Angelis, Alessandro
AU - De Lotto, B.
AU - Delfino, M
AU - Delgado, J
AU - Di Pierro, F
AU - Do Souto Espiñera, E.
AU - Domínguez, A.
AU - Dominis Prester, Dijana
AU - Dorner, D
AU - Doro, M.
AU - Einecke, S.
AU - Elsaesser, D.
AU - Fallah Ramazani, V.
AU - Fattorini, L.
AU - Fernández-Barral, A.
AU - Ferrara, G.
AU - Fidalgo, D.
AU - Foffano, L.
AU - Fonseca, M.V.
AU - Font, L.
AU - Fruck, C.
AU - Galindo, D.
AU - Gallozzi, S
AU - García López, R.J.
AU - Garczarczyk, M.
AU - Gaug, M.
AU - Giammaria, P.
AU - Godinovic, N.
AU - Guberman, D.
AU - Hadasch, D.
AU - Hahn, A.
AU - Hassan, T.
AU - Herrera, J.
AU - Hoang, J.
AU - Hrupec, D.
AU - Inoue, S.
AU - Ishio, K.
AU - Iwamure, Y.
AU - Kubo, Hidetoshi
AU - Kushida, J.
AU - Kuveždić, D.
AU - Lamastra, A.
AU - Lelas, D.
AU - Leone, F.
AU - Lindfors, E.
AU - Lombardi, S.
AU - Longo, F.
AU - López, M.
AU - López-Oramas, A.
AU - Maggio, C.
AU - Majumdar, P.
AU - Makariev, M.
AU - Maneva, G.
AU - Manganaro, M.
AU - Mannheim, K.
AU - Maraschi, L.
AU - Mariotti, M.
AU - Martínez, M.
AU - Masuda, S.
AU - Mazin, D.
AU - Minev, M.
AU - Miranda, J.M.
AU - Mirzoyan, R.
AU - Molina, E.
AU - Moralejo, A.
AU - Moreno, V.
AU - Moretti, E.
AU - Munar-Adrover, P.
AU - Neustroev, V.
AU - Niedzwiecki, A.
AU - Nievas Rosillo, M.
AU - Nigro, C.
AU - Nilsson, K.
AU - Ninci, D.
AU - Nishijima, K.
AU - Noda, K.
AU - Nogués, L.
AU - Paiano, S.
AU - Palacio, J.
AU - Paneque, D.
AU - Paoletti, R.
AU - Paredes, J.M.
AU - Pedaletti, G.
AU - Peñil, P.
AU - Peresano, M.
AU - Persic, M.
AU - Prada Moroni, P.G.
AU - Prandini, E.
AU - Puljak, I.
AU - Garcia, J.R.
AU - Rhode, W.
AU - Ribó, M.
AU - Rico, J.
AU - Righi, C.
AU - Rugliancich, A.
AU - Saha, L.
AU - Saito, T.
AU - Satalecka, K.
AU - Schweizer, T.
AU - Sitarek, J.
AU - Šnidarić, I.
AU - Sobczynska, D.
AU - Somero, A.
AU - Stamerra, A.
AU - Strzys, M.
AU - Suric, T.
AU - Tavecchio, F.
AU - Temnikov, P.
AU - Terzic, T.
AU - Teshima, M.
AU - Torres-Albà, N.
AU - Tsujimoto, S.
AU - van Scherpenberg, J.
AU - Vanzo, G.
AU - Acosta, M. Vazquez
AU - Vovk, I.
AU - Ward, J.E.
AU - Will, M.
AU - Zarić, D.
AU - Becerra González, J.
AU - Raiteri, C.M.
AU - Sandrinelli, A.
AU - Hovatta, Talvikki
AU - Kiehlmann, Sebastian
AU - Max-Moerbeck, W.
AU - Tornikoski, Merja
AU - Lähteenmäki, Anne
AU - Tammi, Joni
AU - Ramakrishnan, Venkatessh
AU - Thum, C.
AU - Agudo, I.
AU - Molina, S.N.
AU - Gómez, J.L.
AU - Fuentes, A.
AU - Casadio, C.
AU - Traianou, Efthalia
AU - Myserlis, I.
AU - Kim, Jaeyoung
AU - MAGIC Collaboration
AU - Fermi Large Area Telescope Collaboration
PY - 2018
Y1 - 2018
N2 - PKS 1510-089 is a flat spectrum radio quasar strongly variable in the optical and GeV range. We search for low-state VHE gamma-ray emission from PKS 1510-089. We aim to characterize and model the source in a broad-band context, which would provide a baseline over which high states and flares could be better understood. We use daily binned Fermi-LAT flux measurements of PKS 1510-089 to characterize the GeV emission and select the observation periods of MAGIC during low state of activity. For the selected times we compute the average radio, IR, optical, UV, X-ray and gamma-ray emission to construct a low-state spectral energy distribution of the source. The broadband emission is modelled within an External Compton scenario with a stationary emission region through which plasma and magnetic field are flowing. We perform also the emission-model-independent calculations of the maximum absorption in the broad line region (BLR) using two different models. Results. The MAGIC telescopes collected 75 hrs of data during times when the Fermi-LAT flux measured above 1 GeV was below 3x10-8cm-2s-1, which is the threshold adopted for the definition of a low gamma-ray activity state. The data show a strongly significant (9.5{\sigma}) VHE gamma-ray emission at the level of (4.27+-0.61stat)x10-12cm-2s-1 above 150GeV, a factor 80 smaller than the highest flare observed so far from this object. Despite the lower flux, the spectral shape is consistent with earlier detections in the VHE band. The broad-band emission is compatible with the EC scenario assuming a large emission region located beyond the BLR. For the first time the gamma-ray data allow us to place a limit on the location of the emission region during a low gamma-ray state of a FSRQ. For the used model of the BLR, the 95% C.L. on the location of the emission region allows us to place it at the distance >74% of the outer radius of the BLR.
AB - PKS 1510-089 is a flat spectrum radio quasar strongly variable in the optical and GeV range. We search for low-state VHE gamma-ray emission from PKS 1510-089. We aim to characterize and model the source in a broad-band context, which would provide a baseline over which high states and flares could be better understood. We use daily binned Fermi-LAT flux measurements of PKS 1510-089 to characterize the GeV emission and select the observation periods of MAGIC during low state of activity. For the selected times we compute the average radio, IR, optical, UV, X-ray and gamma-ray emission to construct a low-state spectral energy distribution of the source. The broadband emission is modelled within an External Compton scenario with a stationary emission region through which plasma and magnetic field are flowing. We perform also the emission-model-independent calculations of the maximum absorption in the broad line region (BLR) using two different models. Results. The MAGIC telescopes collected 75 hrs of data during times when the Fermi-LAT flux measured above 1 GeV was below 3x10-8cm-2s-1, which is the threshold adopted for the definition of a low gamma-ray activity state. The data show a strongly significant (9.5{\sigma}) VHE gamma-ray emission at the level of (4.27+-0.61stat)x10-12cm-2s-1 above 150GeV, a factor 80 smaller than the highest flare observed so far from this object. Despite the lower flux, the spectral shape is consistent with earlier detections in the VHE band. The broad-band emission is compatible with the EC scenario assuming a large emission region located beyond the BLR. For the first time the gamma-ray data allow us to place a limit on the location of the emission region during a low gamma-ray state of a FSRQ. For the used model of the BLR, the 95% C.L. on the location of the emission region allows us to place it at the distance >74% of the outer radius of the BLR.
KW - Galaxies: active
KW - Galaxies: jets
KW - Gamma rays: galaxies
KW - Quasars: individual: PKS 1510-089
U2 - 10.1051/0004-6361/201833618
DO - 10.1051/0004-6361/201833618
M3 - Article
SN - 0004-6361
VL - 619
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A159
ER -