A Narrow-Line Seyfert 1-Blazar Composite Nucleus in 2MASX J0324+3410

Zhou, Hongyan; Wang, Tinggui; Yuan, Weimin; Shan, H. G.; Komossa, Stefanie; Lu, Honglin; Liu, Yi; Xu, Dawei; Bai, J. M.; Jiang, Dongrong

doi:10.1086/513604

Cited by 133 publications

(211 citation statements)

References 38 publications

Supporting

Mentioning

193

Contrasting

Order By: Relevance

“…3 we showed that PKS 2004−447 exhibits radio flux density variability up to a factor of 2 on time scales of months to years at centimetre wavelengths, which are comparable to values reported for other γ-NLS1s (e.g., Zhou et al 2007;D'Ammando et al 2013a,b;Angelakis et al 2015). The recent studies by Foschini et al (2015) and Angelakis et al (2015) have presented the densest, simultaneous multi-frequency radio monitoring of four γ-NLS1s.…”

Section: Flux Density Variability and Spectrumsupporting

confidence: 85%

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

Schulz

Kreikenbohm

Kadler

et al. 2016

A&A

View full text Add to dashboard Cite

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.

show abstract

Section: Flux Density Variability and Spectrumsupporting

confidence: 85%

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

Schulz

Kreikenbohm

Kadler

et al. 2016

A&A

View full text Add to dashboard Cite

show abstract

“…For 1H 0323+342, Hubble Space Telescope images show a ring-like structure (Zhou et al 2007). More detailed studies of the host galaxy decompose into several components, (1) a core, (2) a disk, and (3) a ring, displaying evidence for a recent galaxy interaction rather than secular evolution (León Tavares et al 2014).…”

Section: Host Galaxymentioning

confidence: 99%

“…(3) The radio-loudness of 1H 0323 +342 is high, indicating that the relativistic jet is beamed. (4) Its extensively studied host galaxy shows a complicated structure (e.g., Zhou et al 2007;León Tavares et al 2014), which is different from the paradigm of giant elliptical galaxies as hosts of radio-loud active galactic nuclei (AGNs) (e.g., Scarpa et al 2000). The key point to understand these issues is to measure the black hole mass through reverberation mapping.…”

mentioning

confidence: 99%

Reverberation Mapping of the Gamma-Ray Loud Narrow-Line Seyfert 1 Galaxy 1h 0323+342

Wang

et al. 2016

ApJ

View full text Add to dashboard Cite

Recently, 1H 0323+342 has attracted a lot of attention as one of several narrow-line Seyfert 1 galaxies detected in the γ-ray band. To understand their central energy engines and jet phenomena, the black hole mass is important. We made use of the Lijiang 2.4 m Telescope to monitor 1H 0323+342 for more than two months. This galaxy is one of the candidates for a monitoring project of super-Eddington accreting massive black holes. The reverberation mapping shows that Hβ emission has a delayed response of -+ 14.8 2.7 3.9 days with respect to the SDSS g′ light curve in the rest frame. The optical Fe II variations were detected after subtracting host contaminations, and a reverberation with a delay of -+ 15.2 4.1 7.4 days was found in the rest frame. By assuming the viral factor f BLR = 6.17 for the broadline region (BLR) velocity characterized by FWHM because of the face-on orientation, we find that the black hole mass derived from Hβ is =-, and the accretion rate is M = -+ 1.11 0.47• is the mass accretion rate, L Edd is the Eddington luminosity, and c is the speed of light. This black hole is one order less massive than that given by the Magorrian relation from the bulge mass. We test the relation between accretion rates and radio-loudnesses in all mapped radio-loud active galactic nuclei, and find that 1H 0323+342 falls within this group.

show abstract

“…Furthermore, in general the host galaxies of radio-loud NLS1 have not been yet well characterised and, therefore, it is not clear that these object are host by disk galaxies. Two examples (see Zhou et al 2007;Foschini 2011) suggest that this could be the case at least for some of them. If this is confirmed for a larger sample, it may indicate a possible, interesting link between this group of object and objects like PKS 1814-637.…”

Section: Link To Seyfert Galaxiesmentioning

confidence: 99%

PKS 1814-637: a powerful radio-loud AGN in a disk galaxy

Morganti

Holt

Tadhunter

et al. 2011

A&A

View full text Add to dashboard Cite

We present a detailed study of PKS 1814-637, a rare case of powerful radio source (P 5 GHz = 4.1 × 10 25 W Hz −1 ) hosted by a disk galaxy. Optical images have been used to model the host galaxy morphology confirming it to be dominated by a strong (and warped) disk component that is observed close to edge-on to the line of sight. This is the first radio galaxy found to reside in a disk dominated galaxy with radio luminosity equivalent to powerful FRII objects. At radio wavelengths, PKS 1814-637 is about 480 pc in diameter and it is classified as a compact steep spectrum (CSS) source; such sources are usually considered to be radio sources observed in the early stages of their evolution. However, the optical and mid-IR spectroscopic properties of PKS1814-637 show more in common with Seyfert galaxies than they do with radio galaxies, with the detection of H 2 , and PAH emission features, along with HI and silicate absorption features, providing evidence for a rich ISM which is likely to be related to the disk morphology of the host galaxy. We argue that the interaction between the radio plasma and the rich ISM in this and similar objects may have boosted their radio emission, allowing them to more easily enter flux limited samples of radio sources. In this case, PKS 1814-637 represents a type of "imposter": an intrinsically low power object that is selected in a radio flux limited sample because of the unusually efficient conversion of jet power into radio emission. This would make PKS 1814-637 an extreme example of the effects of jet-cloud interactions in galaxies containing a rich ISM, and perhaps a missing link between radio galaxies and radio-loud Seyfert galaxies. However, it is unlikely that jet-cloud interactions alone can account for the unusually powerful radio emission compared to Seyfert galaxies, and it is probable that the jet in PKS 1814-637 is also intrinsically more powerful than in typical Seyfert galaxies, perhaps due to a higher bulge and black hole mass. The estimated BH mass is indeed higher than the majority of Seyfert galaxies in the local Universe. We speculate that sources similar to PKS1814-637 are likely to be more common at high redshifts, because of the enhanced probability at earlier epochs of triggering radio sources in moderately massive bulges that are also gas-rich.

show abstract

A Narrow-Line Seyfert 1-Blazar Composite Nucleus in 2MASX J0324+3410

Cited by 133 publications

References 38 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

Reverberation Mapping of the Gamma-Ray Loud Narrow-Line Seyfert 1 Galaxy 1h 0323+342

PKS 1814-637: a powerful radio-loud AGN in a disk galaxy

Contact Info

Product

Resources

About