The relativistic jet of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
Daniel Kynoch, Hermine Landt, Martin J. Ward, Chris Done, Emma, Gardner, Catherine Boisson, Maialen Arrieta-Lobo, Andreas Zech, Katrien, Steenbrugge, Miguel Pereira Santaella

TL;DR
This study investigates the gamma-ray emission mechanism in the NLS1 galaxy 1H 0323+342, revealing its jet originates within the BLR and is less powerful than scaled-down FSRQ jets, explaining their rarity.
Contribution
It provides the first detailed jet modeling for a gamma-ray emitting NLS1, showing its emission site within the BLR and its intrinsically lower jet power compared to FSRQs.
Findings
Gamma-ray emission site is within the BLR.
Seed photons mainly from the accretion disc.
Jet power is about half of the accretion disc luminosity.
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 gamma-ray emitting active galactic nuclei with low black hole masses. Like flat spectrum radio quasars (FSRQs), their gamma-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 gamma-ray emission in the lowest-redshift candidate among the currently-known gamma-ray emitting NLS1s, 1H 0323+342, and take a new approach. We observationally constrain the external photon field using quasi-simultaneous near-IR, optical and X-ray spectroscopy. Applying a one-zone leptonic jet model, we simulate the range of jet…
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