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The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS J1222+0413.

Kynoch, Daniel and Landt, Hermine and Ward, Martin J. and Done, Chris and Boisson, Catherine and Baloković, Mislav and Angelakis, Emmanouil and Myserlis, Ioannis (2019) 'The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy PKS J1222+0413.', Monthly notices of the Royal Astronomical Society., 487 (1). pp. 181-197.


We present a multi-frequency study of PKS J1222+0413 (4C +04.42), currently the highest redshift γ-ray emitting narrow-line Seyfert 1 (γ-NLS1). We assemble a broad spectral energy distribution (SED) including previously unpublished datasets: X-ray data obtained with the NuSTAR and Neil Gehrels Swift observatories; near-infrared, optical and UV spectroscopy obtained with VLT X-shooter; and multiband radio data from the Effelsberg telescope. These new observations are supplemented by archival data from the literature. We apply physical models to the broadband SED, parameterising the accretion flow and jet emission to investigate the disc-jet connection. PKS J1222+0413 has a much greater black hole mass than most other NLS1s, MBH≈2×108 M⊙, similar to those found in flat spectrum radio quasars (FSRQs). Therefore this source provides insight into how the jets of γ-NLS1s relate to those of FSRQs.

Item Type:Article
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Publisher statement:© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:25 April 2019
Date deposited:03 May 2019
Date of first online publication:02 May 2019
Date first made open access:No date available

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