SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy

Yao, Shujie; Komossa, Stefanie; Liu, Wenjuan; Yi, Weimin; Yuan, Weimin; Zhou, Hongyan; Wu, Xuebing

doi:10.1093/mnrasl/slz071

Cited by 26 publications

(22 citation statements)

References 63 publications

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“…RL NLS1s are likely to harbour powerful relativistic jets, which are the predominant origin of the radio, optical, partially X-ray, and in some cases, γ -ray radiation. The discovery of γ -ray emission from RL NLS1s detected by the Fermi Large Area Telescope (LAT) confirmed the presence of relativistic beamed jets in this type of AGNs along with blazars and radio galaxies (Abdo et al 2009a, b, c;Foschini et al 2011Foschini et al , 2015D'Ammando et al 2015D'Ammando et al , 2016Liao et al 2015;Yao et al 2015;Paliya & Stalin 2016;Berton et al 2017;Lähteenmäki et al 2018;Paliya et al 2018;Yao et al 2019). In addition, radio observations of several RL NLS1s with the Very Long Baseline Array (VLBA) showed that they exhibit pcscale radio jets, compact radio morphologies, flat or inverted radio spectra, high brightness temperatures, and a significant degree of polarization (Abdo et al 2009a, b;Gu et al 2015;Lister et al 2018).…”

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confidence: 91%

Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations

Chen

Järvelä

Crepaldi

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present the results of new radio observations carried out with the Karl G. Jansky Very Large Array C-configuration at 5.5 GHz for a sample of southern narrow-line Seyfert 1 galaxies (NLS1s). This work increases the number of known radio-detected NLS1s in the southern hemisphere, and confirms that the radio emission of NLS1s is mainly concentrated in a central region at kpc-scale and only a few sources show diffuse emission. In radio-quiet NLS1s, the radio luminosity tends to be higher in steep-spectrum sources and be lower in flat-spectrum sources, which is opposite to radio-loud NLS1s. This may be because the radio emission of steep NLS1s is dominated by misaligned jets, AGN-driven outflows, or star formation superposing on a compact core. Instead the radio emission of flat NLS1s may be produced by a central core which has not yet developed radio jets and outflows. We discover new NLS1s harboring kpc-scale radio jets and confirm that a powerful jet does not require a large-mass black hole to be generated. We also find sources dominated by star formation. These NLS1s could be new candidates in investigating the radio emission of different mechanisms.

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confidence: 91%

Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations

Chen

Järvelä

Crepaldi

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…The detection of γ-ray emission in RL-NLS1s by Fermi /LAT is convincing evidence for the existence of relativistic jets in this class of AGNs (Abdo et al 2009;D'Ammando et al 2012;Yao et al 2015Yao et al , 2019Paliya et al 2018;Yang et al 2018;Paliya 2019). Evidence for interactions between kpc-scale jets and ambient gas in CSSs is revealed (O'Dea 1998 for a review), and superluminal motion is also observed in a few CSSs (Cotton et al 1997 for 3C 138;Taylor et al 1995 for 3C 216;Gawroński & Kus 2006 for 3C 309.1), indicating that the beaming effect may impact on some orientation-dependent properties of CSSs (Saikia et al 1995).…”

Section: Introductionmentioning

confidence: 84%

Jet Properties of Compact Steep-Spectrum Sources and an Eddington-Ratio-Driven Unification Scheme of Jet Radiation in Active Galactic Nuclei

Zhang,

Gan

et al. 2020

Preprint

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Compact steep-spectrum sources (CSSs) likely represent a population of young radio-loud active galactic nuclei (AGNs) and have been identified as γ-ray emitting sources. We present a comprehensive analysis of their γ-ray emission observed with Fermi/LAT and establish their broadband spectral energy distributions (SEDs). We derive their jet properties by the SED fits with a two-zone leptonic model for radiations from the compact core and large-scale extended region, and explore the possible signature of a unification picture of jet radiation among subclasses of AGNs. We show that the observed γ-rays of CSSs with significant variability are contributed by the radiation of their compact cores via the inverse Compton process of the torus photons. The derived power-law distribution index of the radiating electrons is p 1 ∼ 1.5 − 1.8, magnetic field strength is B ∼ 0.15 − 0.6 G, and Doppler boosting factor is δ ∼ 2.8 − 8.9. Assuming that the jet is composed of e ± pairs, the compact cores of CSSs are magnetized and have a high radiation efficiency, similar to that of flat spectrum radio quasars. The γ-ray emitting CSSs on average have higher Eddington ratio and black hole mass than those non-GeV-detected CSSs, and they follow the correlation between the jet power in units of Eddington luminosity (P e ± jet /L Edd ) and Eddington ratio (R Edd ) with other sub-classes of AGNs, P e ± jet /L Edd ∝ R 0.52±0.03 Edd, indicating that R Edd would be a key physical driver for the unification scheme of AGN jet radiation.

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“…On the other hand, in addition to a similar doublehumped spectral energy distribution (SED) of some RLNLSy1s with blazars (e.g., Abdo et al, 2009c;Paliya et al, 2013b;Paliya, 2019), a significant fraction of RLNLSy1s especially very radio-loud (R > 100) display blazar-like characteristics such as rapid infrared and X-ray flux variability (Boller et al, 1996;Grupe et al, 1998;Leighly, 1999;Hayashida, 2000;Komossa & Meerschweinchen, 2000;Jiang et al, 2012;Itoh et al, 2013;Yao et al, 2015;Gabanyi et al, 2018), compact radio cores, high brightness temperature, superluminal motion, flat radio and X-ray spectra (Yuan et al, 2008;Orienti et al, 2012;Berton et al, 2018;Lister, 2018). All these characteristics give indirect evidence of the presence of jets in them and detections of γ-ray emissions by Fermi-Large Area Telescope (Fermi-LAT) 1 from a handful of RLNLSy1s support the scenario that these jets are relativistic (Abdo et al, 2009a,b,c;Foschini et al, 2010;Foschini, 2011;D'Ammando et al, 2012D'Ammando et al, , 2015Yao et al, 2015;Paliya et al, 2018;Yang et al, 2018;Yao et al, 2019).…”

Section: Introductionmentioning

confidence: 94%

Intra-night optical variability study of a non-jetted narrow-line Seyfert 1 galaxy: SDSS J163401.94+480940.1

Ojha

2022

Preprint

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SDSS J163401.94+480940.2 is a non-jetted radio-loud narrow-line Seyfert 1 (NLSy1) galaxy. Optical monitoring of this object was carried out in two intra-night sessions each ≥ 3 hrs with 3.6m DOT. Intra-night optical variability (INOV) characterization is presented for the first time for this source. We have detected an unexpected remarkable flare in one of two monitoring sessions of SDSS J163401.94+480940.2, whose rapid brightening phase implied a minute like doubling time of ∼ 22 minutes, thereby approaching to the extremely fast minute like variability, observed from FSRQ PKS 1222+21 at 400 GeV. The detection of a minute-like variability suggests the existence of relativistic jets with a small viewing angle. We briefly discuss the possible mechanisms for the nondetection of relativistic jets in its Very Long Baseline Array (VLBA) observations.

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SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy

Cited by 26 publications

References 63 publications

Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations

Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations

Jet Properties of Compact Steep-Spectrum Sources and an Eddington-Ratio-Driven Unification Scheme of Jet Radiation in Active Galactic Nuclei

Intra-night optical variability study of a non-jetted narrow-line Seyfert 1 galaxy: SDSS J163401.94+480940.1

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