Daniel Kynoch
The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
Kynoch, Daniel; Landt, Hermine; Ward, Martin J; Done, Chris; Gardner, Emma; Boisson, Catherine; Arrieta-Lobo, Maialen; Zech, Andreas; Steenbrugge, Katrien; Pereira Santaella, Miguel
Authors
Hermine Landt
Professor Martin Ward martin.ward@durham.ac.uk
External Examiner (PGR)
Professor Christine Done chris.done@durham.ac.uk
Professor
Emma Gardner
Catherine Boisson
Maialen Arrieta-Lobo
Andreas Zech
Katrien Steenbrugge
Miguel Pereira Santaella
Contributors
Dr Hermine Landt-Wilman hermine.landt@durham.ac.uk
Other
Abstract
The detection of several radio-loud narrow-line Seyfert 1 (NLS1) galaxies by the Fermi Gamma-Ray Space Telescope hints at the existence of a rare, new class of γ-ray emitting active galactic nuclei with low black hole masses. Like flat spectrum radio quasars (FSRQs), their γ-ray emission is thought to be produced via the external Compton mechanism whereby relativistic jet electrons upscatter a photon field external to the jet, e.g. from the accretion disc, broad line region (BLR), and dusty torus, to higher energies. Here we study the origin of the γ-ray emission in the lowest-redshift candidate among the currently known γ-ray emitting NLS1s, 1H 0323+342, and take a new approach. We observationally constrain the external photon field using quasi-simultaneous near-infrared, optical, and X-ray spectroscopy. Applying a one-zone leptonic jet model, we simulate the range of jet parameters for which this photon field, when Compton scattered to higher energies, can explain the γ-ray emission. We find that the site of the γ-ray emission lies well within the BLR and that the seed photons mainly originate from the accretion disc. The jet power that we determine, 1.0 × 1045 erg s−1, is approximately half the accretion disc luminosity. We show that this object is not simply a low-mass FSRQ, its jet is intrinsically less powerful than predicted by scaling a typical FSRQ jet by black hole mass and accretion rate. That γ-ray-emitting NLS1s appear to host underpowered jets may go some way to explaining why so few have been detected to date.
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 4, 2017 |
Online Publication Date | Dec 8, 2017 |
Publication Date | Mar 21, 2018 |
Deposit Date | Feb 2, 2018 |
Publicly Available Date | Feb 2, 2018 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 475 |
Issue | 1 |
Pages | 404-423 |
DOI | https://doi.org/10.1093/mnras/stx3161 |
Public URL | https://durham-repository.worktribe.com/output/1340298 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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