The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN

E. Congiu; P. Kharb; A. Tarchi; M. Berton; A. Caccianiga; S. Chen; L. Crepaldi; F. Di Mille; E. Järvelä; M. E. Jarvis; G. la Mura; A. Vietri

doi:10.1093/mnras/staa3024

The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN

E. Congiu^*
, P. Kharb
, A. Tarchi
, M. Berton
, A. Caccianiga
, S. Chen
, L. Crepaldi
, F. Di Mille
, E. Järvelä
, M. E. Jarvis
, G. la Mura
, A. Vietri

^*Corresponding author for this work

Metsähovi Radio Observatory

Universidad de Chile
Carnegie Institution of Washington
Tata Institute of Fundamental Research
National Institute for Astrophysics (INAF)
University of Turku
Istituto Nazionale di Astrofisica (INAF)
Technion - Israel Institute of Technology
University of Padova
European Space Astronomy Centre
Max-Planck-Institut für Astrophysik
European Southern Observatory
Ludwig Maximilian University of Munich

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

9 Citations (Scopus)

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Abstract

In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interferometer confirm the presence of the diffuse emission previously observed. The Very Long Baseline Array (VLBA) also detects the nuclear source both at 1.6 GHz (L band) and 5 GHz (C band). While the L-band image shows only an unresolved core, the C-band image shows the presence of a partially resolved structure at a position angle of 60^◦. The brightness temperature of the emission in both bands (>10⁶ K) suggests that it is a pc-scale jet produced by the active galactic nucleus. The relatively steep VLBA spectral index (α_VLBA = 0.63 ± 0.03) is consistent with the presence of optically thin emission on milliarcsecond scales. Finally, we investigated two possible scenarios that can result in the misalignment between the kpc and pc-scale radio structure detected in the galaxy. We also analysed the optical morphology of the galaxy, which suggests that Mrk 783 underwent a merging in relatively recent times.

Original language	English
Pages (from-to)	3149-3157
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	499
Issue number	3
DOIs	https://doi.org/10.1093/mnras/staa3024
Publication status	Published - 1 Dec 2020
MoE publication type	A1 Journal article-refereed

Funding

The authors of the paper want to thank the anonymous referee for helpful suggestions and Dr. Javier Molton of the e-MERLIN support centre for his precious help on the data reduction. EC acknowledges support from ANID project Basal AFB-170002. e-MERLIN is a National Facility operated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This paper includes data gathered with the 2.5-m du Pont Telescopes located at Las Campanas Observatory, Chile. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research made use of facilities at the Mets?hovi Radio Observatory, operated by the Aalto University, Finland. This research made use of Astropy5, a community-developed core PYTHON package for Astronomy (Astropy Collaboration 2013, 2018). This research made use of APLPY, an open-source plotting package for PYTHON hosted at http://aplpy.github.com.

Keywords

Galaxies: individual: Mrk 783
Galaxies: Seyfert
Radio continuum: galaxies

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10.1093/mnras/staa3024

staa3024Final published version, 1.53 MB

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@article{26df71935a46429cad1fdcbd4ddef17e,

title = "The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN",

abstract = "In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interferometer confirm the presence of the diffuse emission previously observed. The Very Long Baseline Array (VLBA) also detects the nuclear source both at 1.6 GHz (L band) and 5 GHz (C band). While the L-band image shows only an unresolved core, the C-band image shows the presence of a partially resolved structure at a position angle of 60◦. The brightness temperature of the emission in both bands (>106 K) suggests that it is a pc-scale jet produced by the active galactic nucleus. The relatively steep VLBA spectral index (αVLBA = 0.63 ± 0.03) is consistent with the presence of optically thin emission on milliarcsecond scales. Finally, we investigated two possible scenarios that can result in the misalignment between the kpc and pc-scale radio structure detected in the galaxy. We also analysed the optical morphology of the galaxy, which suggests that Mrk 783 underwent a merging in relatively recent times.",

keywords = "Galaxies: individual: Mrk 783, Galaxies: Seyfert, Radio continuum: galaxies",

author = "E. Congiu and P. Kharb and A. Tarchi and M. Berton and A. Caccianiga and S. Chen and L. Crepaldi and \{Di Mille\}, F. and E. J{\"a}rvel{\"a} and Jarvis, \{M. E.\} and \{la Mura\}, G. and A. Vietri",

year = "2020",

month = dec,

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doi = "10.1093/mnras/staa3024",

language = "English",

volume = "499",

pages = "3149--3157",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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TY - JOUR

T1 - The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN

AU - Congiu, E.

AU - Kharb, P.

AU - Tarchi, A.

AU - Berton, M.

AU - Caccianiga, A.

AU - Chen, S.

AU - Crepaldi, L.

AU - Di Mille, F.

AU - Järvelä, E.

AU - Jarvis, M. E.

AU - la Mura, G.

AU - Vietri, A.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interferometer confirm the presence of the diffuse emission previously observed. The Very Long Baseline Array (VLBA) also detects the nuclear source both at 1.6 GHz (L band) and 5 GHz (C band). While the L-band image shows only an unresolved core, the C-band image shows the presence of a partially resolved structure at a position angle of 60◦. The brightness temperature of the emission in both bands (>106 K) suggests that it is a pc-scale jet produced by the active galactic nucleus. The relatively steep VLBA spectral index (αVLBA = 0.63 ± 0.03) is consistent with the presence of optically thin emission on milliarcsecond scales. Finally, we investigated two possible scenarios that can result in the misalignment between the kpc and pc-scale radio structure detected in the galaxy. We also analysed the optical morphology of the galaxy, which suggests that Mrk 783 underwent a merging in relatively recent times.

AB - In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interferometer confirm the presence of the diffuse emission previously observed. The Very Long Baseline Array (VLBA) also detects the nuclear source both at 1.6 GHz (L band) and 5 GHz (C band). While the L-band image shows only an unresolved core, the C-band image shows the presence of a partially resolved structure at a position angle of 60◦. The brightness temperature of the emission in both bands (>106 K) suggests that it is a pc-scale jet produced by the active galactic nucleus. The relatively steep VLBA spectral index (αVLBA = 0.63 ± 0.03) is consistent with the presence of optically thin emission on milliarcsecond scales. Finally, we investigated two possible scenarios that can result in the misalignment between the kpc and pc-scale radio structure detected in the galaxy. We also analysed the optical morphology of the galaxy, which suggests that Mrk 783 underwent a merging in relatively recent times.

KW - Galaxies: individual: Mrk 783

KW - Galaxies: Seyfert

KW - Radio continuum: galaxies

UR - https://www.scopus.com/pages/publications/85097032838

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DO - 10.1093/mnras/staa3024

M3 - Article

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SP - 3149

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN

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Metsähovi Radio Observatory

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The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN

Abstract

Funding

Keywords

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Metsähovi Radio Observatory

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