JET PROPERTIES OF GeV-SELECTED RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES AND POSSIBLE CONNECTION TO THEIR DISK AND CORONA

Sun, Xiao-Na; Zhang, Jin; Lin, Da-Bin; Xue, Zi-Wei; Liang, En‐Wei; Zhang, Shuang‐Nan

doi:10.1088/0004-637x/798/1/43

Cited by 41 publications

(88 citation statements)

References 81 publications

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“…In comparison to the SED of a typical BL Lac and FSRQ source, they found that their broad-band spectra can be regarded as intermediate between both blazar types, although they bear a closer resemblance to the SED of FSRQs. Similar results have been obtained by independent studies from Foschini et al (2015) and Sun et al (2015). Table 7.…”

Section: Foschinisupporting

confidence: 91%

The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447

Kreikenbohm

Schulz

Kadler

et al. 2015

A&A

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As part of the TANAMI multiwavelength progam, we discuss new X-ray observations of the γ-ray and radio-loud narrow line Seyfert 1 galaxy (γ-NLS1) PKS 2004−447. The active galaxy is a member of a small sample of radio-loud NLS1s detected in γ-rays by the Fermi Large Area Telescope. It stands out for being the radio-loudest and the only southern-hemisphere source in this sample. We present results from our X-ray monitoring program comprised of Swift snapshot observations from 2012 through 2014 and two new X-ray observations with XMM-Newton in 2012. Supplemented by archival data from 2004 and 2011, our data set allows for a careful analysis of the X-ray spectrum and variability of this peculiar source. The (0.5-10) keV spectrum is described well by a power law (Γ ∼ 1.6), which can be interpreted as non-thermal emission from a relativistic jet. The source exhibits moderate flux variability on timescales of both months and years. Correlated brightness variations in the (0.5-2) keV and (2-10) keV bands are explained by a single variable spectral component, such as the one from the jet. A possible soft excess seen in the data from 2004 cannot be confirmed by the new XMM-Newton observations taken during low-flux states. Any contribution to the total flux in 2004 is less than 20% of the power-law component. The (0.5-10) keV luminosities of PKS 2004−447 are in the range of (0.5−2.7) × 10 44 erg s −1 . A comparison of the X-ray properties among the known γ-NLS1 galaxies shows that in four out of five cases the X-ray spectrum is dominated by a flat power law without intrinsic absorption. These objects are moderately variable in their brightness, while spectral variability is observed in at least two sources. The major difference across the X-ray spectra of γ-NLS1s is the luminosity, which spans a range of almost two orders of magnitude from 10 44 erg s −1 to 10 46 erg s −1 in the (0.5-10) keV band.

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Section: Foschinisupporting

confidence: 91%

The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447

Kreikenbohm

Schulz

Kadler

et al. 2015

A&A

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“…Two scenarios were considered for the EC scattering process: a seed photon field dominated from the torus and from the BLR, respectively. The energy density of the former was assumed to be 3 × 10 −4 erg cm −3 (see more details in Cleary et al 2007;Ghisellini & Tavecchio 2008) and the latter was estimated from the broad Hβ line luminosity derived in Section 2 (see more details in Sun et al 2015;Zhang et al 2015). The energy distribution of the injected relativistic electrons was assumed to be a broken PL in the range of [γ min , γ max ] with a break energy γ b .…”

Section: Broad-band Spectral Energy Distributionmentioning

confidence: 99%

SDSS J211852.96−073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy

Yang

Yuan

Yao

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We report on the identification of a new γ-ray-emitting narrow-line Seyfert 1 (NLS1) galaxy, SDSS J211852.96−073227.5 (hereinafter J2118−0732). The galaxy, at a redshift of 0.26, is associated with a radio source of flat/inverted spectrum at high radio frequencies. The analysis of its optical spectrum obtained in the Sloan Digital Sky Survey (SDSS) revealed a small linewidth of the broad component of the Hβ line (full width at half-maximum = 1585 km s −1 ), making it a radio-loud NLS1 galaxy -an intriguing class of active galactic nuclei with exceptional multiwavelength properties. A new γ-ray source centred at J2118−0732 was sporadically detected during 2009-2013 in form of flares by the Fermi-LAT. Our XMM-Newton observations revealed a flat X-ray spectrum described by a simple power law, and a flux variation by a factor of ∼2.5 in five months. The source also shows intraday variability in the infrared band. Its broad-band spectral energy distribution can be modelled by emission from a simple one-zone leptonic jet model, and the flux drop from infrared to X-rays in five months can be explained by changes of the jet parameters, though the exact values may be subject to relatively large uncertainties. With the NLS1-blazar composite nucleus, the clear detection of the host galaxy, and the synchronous variations in the multiwavelength fluxes, J2118−0732 provides a new perspective on the formation and evolution of relativistic jets under the regime of relatively small black hole masses and high accretion rates.

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“…Along with their small SMBH masses, i.e., more rapid timescales of variability, this makes radio-loud NLS1 galaxies excellently suited for studying the disc-jet symbiosis. The black symbols represent the SED of SDSSJ1222+0413 ( [148]), while the grey symbols are measurements and models of PMN0948+0022 at different epochs, taken from [31], [132] and [46].…”

Section: Figurementioning

confidence: 99%

“…In many cases, an accretion-disc component is additionally present. The SEDs are generally well modelled with one-zone leptonic jet models with external Comptonization (e.g., [1], [2], [3], [44], [27], [28], [31], [32], [45], [46], [47], [113], [114], [115], [153], [103], [132], [147], [148], [110], [79], [146]). Based on detailed modelling of the SED of 1H0323+342, [85] concluded that the site of the γ-ray formation is located inside the BLR, and that the external Comptonization is due to seed photons from the accretion disc.…”

Section: Sed Modellingmentioning

confidence: 99%

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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JET PROPERTIES OF GeV-SELECTED RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES AND POSSIBLE CONNECTION TO THEIR DISK AND CORONA

Cited by 41 publications

References 81 publications

The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447

The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447

SDSS J211852.96−073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy

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

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