[O III] line properties in two samples of radio-emitting narrow-line Seyfert 1 galaxies

Berton, M.; Foschini, L.; Ciroi, S.; Cracco, V.; Mura, G. La; Mille, F. Di; Rafanelli, P.

doi:10.1051/0004-6361/201527056

Cited by 47 publications

(56 citation statements)

References 67 publications

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“…In fact, since CSS/HERGs display lobes that are already developed (Orienti 2016), this means that the extended radio emission form even in very young ages, which in turn implies the rejection of the radio-quiet hypothesis. This conclusion is in agreement with the results of Berton et al (2016b), where the observed differences in narrow-line region properties points in the same direction.…”

Section: Evolutionary Picturesupporting

confidence: 93%

Compact steep-spectrum sources as the parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Berton¹,

Caccianiga²,

Foschini³

et al. 2016

A&A

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Narrow-line Seyfert 1 galaxies (NLS1s) are an interesting subclass of active galactic nuclei (AGN), which tipically does not exhibit any strong radio emission. Seven percent of them, though, are radio-loud and often show a flat radio-spectrum (F-NLS1s). This, along to the detection of γ-ray emission coming from them, is usually interpreted as a sign of a relativistic beamed jet oriented along the line of sight. An important aspect of these AGN that must be understood is the nature of their parent population, in other words how do they appear when observed under different angles. In the recent literature it has been proposed that a specific class of radio-galaxies, compact-steep sources (CSS) classified as high excitation radio galaxies (HERG), can represent the parent population of F-NLS1s. To test this hypothesis in a quantitative way,in this paper we analyzed the only two statistically complete samples of CSS/HERGs and F-NLS1s available in the literature. We derived the black hole mass and Eddington ratio distributions, and we built for the first time the radio luminosity function of F-NLS1s. Finally, we applied a relativistic beaming model to the luminosity function of CSS/HERGs, and compared the result with the observed function of F-NLS1s. We found that compact steep-spectrum sources are valid parent candidates and that F-NLS1s, when observed with a different inclination, might actually appear as CSS/HERGs.

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Section: Evolutionary Picturesupporting

confidence: 93%

Compact steep-spectrum sources as the parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Berton¹,

Caccianiga²,

Foschini³

et al. 2016

A&A

Self Cite

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“…By combining these optical data with archival radio, infrared (WISE), γ-ray (Fermi) data and X-ray data taken via a ToO observation with X-ray Telescope (XRT) on board the Swift satellite, Tanaka et al (2014) revealed the similarity of this object's SED to those of the radio/γ-ray-loud NLS1s, although the large [O III]/Hβ flux ratio does not satisfy the general criteria for NLS1s. Flux ratio between the [O III] emission lines and radio emission is also consistent with those of radio-loud NLS1s (Berton et al 2016).…”

Section: Introductionsupporting

confidence: 79%

OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3

Morokuma

Tanaka

et al. 2017

Publications of the Astronomical Society of Japan

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We present monitoring campaign observations at optical and near-infrared (NIR) wavelengths for a radio-loud active galactic nucleus (AGN) at z = 0.840, SDSS J110006.07+442144.3 (hereafter, J1100+4421), which was identified during a flare phase in late February, 2014. The campaigns consist of three intensive observing runs from the discovery to March, 2015, mostly within the scheme of the OISTER collaboration. Optical-NIR light curves and simultaneous spectral energy distributions (SEDs) are obtained. Our measurements show the strongest brightening in March, 2015. We found that the optical-NIR SEDs of J1100+4421 show an almost steady shape despite the large and rapid intranight variability. This constant SED shape is confirmed to extend to ∼ 5 µm in the observed frame using the archival WISE data. Given the lack of absorption lines and the steep power-law spectrum of α ν ∼ −1.4, where f ν ∝ ν αν , synchrotron radiation by a relativistic jet with no or small contributions from the host galaxy and the accretion disk seems most plausible as an optical-NIR emission mechanism. The steep optical-NIR spectral shape and the large amplitude of variability are consistent with this object being a low ν peak jet-dominated AGN. In addition, sub-arcsec resolution optical imaging data taken with Subaru Hyper Suprime-Cam does not show a clear extended component and the spatial scales are significantly smaller than the large extensions detected at radio wavelengths. The optical spectrum of a possible faint companion galaxy does not show any emission lines at the same redshift and hence a merging hypothesis for this AGN-related activity is not supported by our observations.

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“…This might indicate that more sources of this kind could be found among RQ objects. Very few RQNLS1s show detectable jets or diffuse radio emission (Berton et al 2016b). This is partly because they are by definition faint in the radio regime, but some objects that fit the RQ definition show nonthermal core emission when observed with high sensitivity (Giroletti & Panessa 2009).…”

Section: Discussionmentioning

confidence: 99%

“…This broad component is clearly visible in all the permitted lines of the optical spectrum. Conversely, narrow lines, and particularly [O III]λ5007, do not show any outflowing component and are well reproduced by a single Gaussian profile (Berton et al 2016b).…”

Section: Mrk 783mentioning

confidence: 96%

Kiloparsec-scale emission in the narrow-line Seyfert 1 galaxy Mrk 783

Congiu

Berton

Giroletti

et al. 2017

A&A

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We present the first results of a radio survey of 79 narrow-line Seyfert 1 (NLS1) carried out with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A configuration aimed at studying the radio properties of these sources. We report the detection of extended emission in one object: Mrk 783. This is intriguing, since the radio-loudness parameter R of this object is close to the threshold between radio-quiet and radio-loud active galactic nuclei (AGN). The galaxy is one of the few NLS1 showing such an extended emission at z < 0.1. The radio emission is divided into a compact core component and an extended component, observed on both sides of the nucleus and extending from 14 kpc southeast to 12 kpc northwest. There is no sign of a collimated jet and the shape of the extended component is similar to those of some Seyfert galaxies. The properties of the emission are compatible with a relic produced by the intermittent activity cycle of the AGN.

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[O III] line properties in two samples of radio-emitting narrow-line Seyfert 1 galaxies

Cited by 47 publications

References 67 publications

Compact steep-spectrum sources as the parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Compact steep-spectrum sources as the parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3

Kiloparsec-scale emission in the narrow-line Seyfert 1 galaxy Mrk 783

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