Parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Berton, M.; Foschini, L.; Ciroi, S.; Cracco, V.; Mura, G. La; Lister, M. L.; Mathur, S.; Peterson, B. M.; Richards, J. L.; Rafanelli, P.

doi:10.1051/0004-6361/201525691

Cited by 84 publications

(141 citation statements)

References 92 publications

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“…Our results on the morphology and brightness temperature indicate that IRAS 17020+4544 is different from this sub-set of the NLS1 population; yet, it remains also markedly separated from the bulk of the radio quiet NLS1 population, which have much lower radio powers (as low as P 1.4 GHz ∼ 10 19 W Hz −1 ) and are seldom detected with VLBI (Giroletti & Panessa 2009;Doi et al 2013). One intriguing possibility is that IRAS 17020+4544 belongs to the elusive population of misaligned RL NLS1s (Berton et al 2015).…”

Section: Discussionmentioning

confidence: 70%

Coexistence of a non-thermal jet and a complex ultra-fast X-ray outflow in a moderately luminous AGN

Giroletti

Panessa

Longinotti

et al. 2017

A&A

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Context. Recent XMM-Newton observations have revealed that IRAS 17020+4544 is a very unusual example of black hole windproduced feedback by a moderately luminous AGN in a spiral galaxy. Aims. Since the source is known for being a radio emitter, we investigated about the presence and the properties of a non-thermal component. Methods. We observed IRAS 17020+4544 with the Very Long Baseline Array at 5, 8, 15, and 24 GHz within a month of the 2014 XMM-Newton observations. We further analysed archival data taken in 2000 and 2012.Results. We detect the source at 5 GHz and on short baselines at 8 GHz. At 15 and 24 GHz, the source is below our baseline sensitivity for fringe fitting, indicating the lack of prominent compact features. The morphology is that of an asymmetric double, with significant diffuse emission. The spectrum between 5 and 8 GHz is rather steep (S (ν) ∼ ν −(1.0±0.2) ). Our re-analysis of the archival data at 5 and 8 GHz provides results consistent with the new observations, suggesting that flux density and structural variability are not important in this source. We put a limit on the separation speed between the main components of < 0.06c. Conclusions. IRAS 17020+4544 shows interesting features of several classes of objects: its properties are typical of compact steep spectrum sources, low power compact sources, radio-emitting narrow line Seyfert 1 galaxies. However, it can not be classified in any of these categories, remaining so far a one-of-a-kind object.

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Section: Discussionmentioning

confidence: 70%

Coexistence of a non-thermal jet and a complex ultra-fast X-ray outflow in a moderately luminous AGN

Giroletti

Panessa

Longinotti

et al. 2017

A&A

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“…Both paradigms are also discussed for γ-NLS1(e.g., Abdo et al 2009c;Foschini et al 2015;Berton et al 2015), and it has been proposed that CSS and RL-NLS1 are linked (e.g., Komossa et al 2006;Doi et al 2012;Caccianiga et al 2014;Komossa et al 2015;Gu et al 2015). Recently, Caccianiga et al (2015) have found evidence of significant star formation activity in a sample of RL-NLS1s, favouring the scenario that RL-NLS1s are young AGNs.…”

Section: Parsec-scale Structure and Jet Orientationmentioning

confidence: 99%

“…Then, Yuan et al (2008) compiled a genuine sample of 23 RL-NLS1s with RL 1.4 GHz > 100, with black hole masses of 10 6 -10 8 M and Eddingtion ratios R Edd ≈ 1. Based on these and other studies, Foschini et al (2015) and Berton et al (2015) have a combined sample of 60 sources with RL 5 GHz > 10. Only a few RL-NLS1s have been detected by Fermi/LAT (γ-NLS1, Abdo et al 2009b;Foschini et al 2015;D'Ammando et al 2015;Yao et al 2015, see Sect.…”

Section: Introductionmentioning

confidence: 95%

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

Schulz

Kreikenbohm

Kadler

et al. 2016

A&A

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Context. Γ-ray-detected radio-loud narrow-line Seyfert 1 (γ-NLS1) galaxies constitute a small but interesting sample of the γ-ray-loud AGN. The radio-loudest γ-NLS1 known, PKS 2004−447, is located in the southern hemisphere and is monitored in the radio regime by the multiwavelength monitoring programme TANAMI. Aims. We aim for the first detailed study of the radio morphology and long-term radio spectral evolution of PKS 2004−447, which are essential for understanding the diversity of the radio properties of γ-NLS1s. Methods. The TANAMI VLBI monitoring program uses the Australian Long Baseline Array (LBA) and telescopes in Antarctica, Chile, New Zealand, and South Africa to monitor the jets of radio-loud active galaxies in the southern hemisphere. Lower resolution radio flux density measurements at multiple radio frequencies over four years of observations were obtained with the Australia Telescope Compact Array (ATCA). Results. The TANAMI VLBI image at 8.4 GHz shows an extended one-sided jet with a dominant compact VLBI core. Its brightness temperature is consistent with equipartition, but it is an order of magnitude below other γ-NLS1s with the sample value varying over two orders of magnitude. We find a compact morphology with a projected large-scale size <11 kpc and a persistent steep radio spectrum with moderate flux-density variability. Conclusions. PKS 2004−447 appears to be a unique member of the γ-NLS1 sample. It exhibits blazar-like features, such as a flat featureless X-ray spectrum and a core-dominated, one-sided parsec-scale jet with indications for relativistic beaming. However, the data also reveal properties atypical for blazars, such as a radio spectrum and large-scale size consistent with compact-steep-spectrum (CSS) objects, which are usually associated with young radio sources. These characteristics are unique among all γ-NLS1s and extremely rare among γ-ray-loud AGN.

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“…Our sample consists of 60 sources drawn from the papers by Foschini et al (2015) and Berton et al (2015), and it contains radio-quiet (but not radio-silent) NLS1s, F-NLS1s, and S-NLS1s. In this paper we report the detection of extended emission in one S-NLS1s, Mrk 783.…”

Section: Introductionmentioning

confidence: 99%

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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Parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies

Cited by 84 publications

References 92 publications

Coexistence of a non-thermal jet and a complex ultra-fast X-ray outflow in a moderately luminous AGN

Coexistence of a non-thermal jet and a complex ultra-fast X-ray outflow in a moderately luminous AGN

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

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

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