Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies

Lähteenmäki, A.; Järvelä, E.; Tornikoski, M.; Tammi, J.; Vera, R. J. C.; Chamani, Wara

doi:10.1051/0004-6361/201833378

Cited by 63 publications

(93 citation statements)

References 37 publications

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“…Nevertheless, we expect more sources to appear, as Fermi continues its measurements. Evidence for faint and/or sporadic γ-ray emission was reported for several more radioloud NLS1 galaxies ( [44], [94], [33], [105], [88]). [12] recently re-classified the optical spectrum Table 1: γ-ray emitting NLS1 galaxies, detected at high significance and published in main journals (see [44], [94], [33], [105], [12] and [88] for further candidates).…”

Section: γ-Ray Detection Of Radio-loud Nls1 Galaxiesmentioning

confidence: 83%

Multi-wavelength properties of radio-loud Narrow-line Seyfert 1 galaxies

Komossa

2018

Proceedings of Revisiting Narrow-Line Seyfert 1 Galaxies and Their Place in the Universe — PoS(NLS1-2018)

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Radio-loud Narrow-line Seyfert 1 (NLS1) galaxies are unique probes of the formation of powerful radio jets at extreme (near-Eddington) accretion rates and low black hole masses, in a regime very different from classical blazars and, therefore, not probed before. Further, strong thermal and nonthermal components simultaneously present in their spectral energy distributions (SEDs), shed new light on the jet-disk connection at much shorter timescales, given their low SMBH masses. While NLS1 galaxies have been studied thoroughly at optical and X-ray energies for decades, the populations of radio-loud, and γ-ray emitting NLS1 galaxies have only emerged more recently. This contribution provides a short review of the multi-wavelength properties of this intriguing class of Active Galactic Nuclei (AGN), including X-ray variability and emission mechanisms, γ-ray discoveries, SEDs, star formation activity, host galaxy morphologies, different methods of black hole mass estimation, (unexpected) FeII properties, and high-velocity large-scale outflows possibly driven by the radio jet and with a surprisingly pronounced ionization stratification.Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe Radio-loud NLS1 galaxies S. Komossa this then implies accretion at or near the Eddington limit (Fig. 1). NLS1 galaxies are, therefore, rapidly growing their supermassive black holes (SMBHs), and may represent young or re-juvenated AGN ([99]). In the Eigenvector (EV) analysis of [18], the Eddington ratio L bol /L Edd drives the first eigenvector EV1, while accretion rate drives EV2.While NLS1 galaxies are on average more radio-quiet than broad-line AGN, a fraction of NLS1s are beamed and radio-loud, are highly variable at radio frequencies, and are detected at γ-rays. This contribution provides a review of the multi-wavelength properties of this remarkable new class of radio-loud, jet-emitting AGN.

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Section: γ-Ray Detection Of Radio-loud Nls1 Galaxiesmentioning

confidence: 83%

Multi-wavelength properties of radio-loud Narrow-line Seyfert 1 galaxies

Komossa

2018

Proceedings of Revisiting Narrow-Line Seyfert 1 Galaxies and Their Place in the Universe — PoS(NLS1-2018)

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“…Since, in this work, we focus on objects with closely aligned jets, γ-ray detected CSS NLSy1s are not considered. Moreover, the γ-ray detection of SDSS J164100.10+345452.7, claimed by Lähteenmäki et al (2018), has not been confirmed (see, Ciprini & Fermi-LAT Collaboration 2018) and hence this object was also not included in our sample. circular regions on the same chip, avoiding contaminating sources.…”

Section: Hard X-raysmentioning

confidence: 99%

General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies

Paliya

Parker

Jiang

et al. 2019

ApJ

116

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We present the results of a detailed multi-wavelength study of a sample of sixteen narrow-line Seyfert 1 (NLSy1) galaxies known in γ-rays so far. This includes a focused X-ray spectral analysis, to compare them with a more general NLSy1 population, and a broadband spectral energy distribution (SED) modeling considering the leptonic radiative processes to understand their similarity/dissimilarity with blazars. The X-ray spectra of γ-NLSy1 galaxies exhibit similarities both with typical NLSy1 sources below 2 keV and blazars at higher energies. We also find weak evidences of excess absorption in the soft X-ray spectra of 3 sources and a tentative detection of Fe line in 1H 0323+342. A comparison of the broadband parameters derived from the SED modeling reveals the similarity of γ-NLSy1 objects with blazars, in particular more with flat spectrum radio quasars. The γ-NLS1 galaxies host relatively low power jets with small bulk Lorentz factors with respect to blazars and this explains the paucity of such sources in the γ-ray catalogs and identification of an even fewer parent population members. Many of the observed features of these intriguing objects suggest they host lowmass black holes. The accretion rate in Eddington units can be considered as the driving factor to explain the physical properties of γ-NLSy1 sources, similar to that which is known for general blazar population.

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“…With Fermi/LAT, it was discovered that a few of the jetted NLS1 galaxies emit luminous γ-ray radiation, highly variable in some cases, and E-mail: yaosu@pku.edu.cn independently confirming the presence of powerful jets in some NLS1 galaxies (Abdo et al 2009b). Meanwhile, about 15 γ-ray emitting NLS1s have been identified (Abdo et al 2009a;Abdo et al 2009a;Foschini 2011;D'Ammando et al 2012;D'Ammando et al 2015;Yao et al 2015;Yang et al 2018;Paliya et al 2018;Lähteenmäki et al 2018; see Komossa 2018 andRomano et al 2018 for reviews).…”

Section: Introductionmentioning

confidence: 99%

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

Yao

Komossa

Liu

et al. 2019

Monthly Notices of the Royal Astronomical Society: Letters

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As hybrids of narrow-line Seyfert 1 (NLS1) galaxies and blazars, γ-ray emitting NLS1s are important probes of jet physics in the high Eddington-ratio regime. Only very few of them are known to date; the majority of them below redshift z = 0.5. Here we present the identification of the γ-ray emitting AGN TXS 0943+105 (SDSS J094635.06+101706.1) as a high-redshift NLS1 galaxy. It turns out to be one of the radio-loudest NLS1s known, highly variable at all wavelengths, and shows widely extended radio emission at a (projected) > 100 kpc scale. It is a known strong γ-ray emitter with a luminous flare reported previously. At redshift z=1.004, this is the most distant γ-NLS1 known to date.

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Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies

Cited by 63 publications

References 37 publications

Multi-wavelength properties of radio-loud Narrow-line Seyfert 1 galaxies

Multi-wavelength properties of radio-loud Narrow-line Seyfert 1 galaxies

General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies

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

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