Discovery of a Pseudobulge Galaxy Launching Powerful Relativistic Jets

Kotilainen, Jari; León-Tavares, J.; Olguín-Iglesias, A.; Baes, M.; Añorve, C.; Chavushyan, V.; Carrasco, L.

doi:10.3847/0004-637x/832/2/157

Cited by 58 publications

(63 citation statements)

References 49 publications

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“…6). Imaging of PKS2004-447 ( [82]) revealed a (pseudo)bulge plus disc and bar, and no evidence for a recent merger. [33], using the GTC 10m telescope, reported evidence for an elliptical host of FBQSJ1644+2619, while [108] prefer a barred lenticular (SB0) host galaxy model of FBQSJ1644+2619, with a pseudo-bulge and a ring, perhaps the aftermath of a minor merger.…”

Section: Inferences From Optical Imaging and Spectroscopy 71 Host Gamentioning

confidence: 97%

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: Inferences From Optical Imaging and Spectroscopy 71 Host Gamentioning

confidence: 97%

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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“…Olguín-Iglesias et al (2017) found FBQS J1644+2619 to reside in a barred lenticular galaxy showing signs of a recent minor merger, but D' Ammando et al (2017) argue that the host is an elliptical galaxy. PKS 2004-447 seems to reside in a barred disklike galaxy (Kotilainen et al 2016), and PKS 1502+036 in an elliptical galaxy (D'Ammando et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Near-infrared morphologies of the host galaxies of narrow-line Seyfert 1 galaxies

Järvelä

Lähteenmäki

Berton

2018

A&A

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We present J-band near-infrared (NIR) imaging of the host galaxies of nine narrow-line Seyfert 1 galaxies (NLS1). Based on highfrequency radio observations at 37 GHz, seven of them could host powerful, most likely relativistic jets. Host galaxy morphology studies of NLS1 galaxies are scarce, but exceedingly important for understanding the seemingly heterogeneous nature of the NLS1 population as well as their evolution and place in the active galactic nuclei (AGN) scheme. Increasing the sample size is essential for achieving statistically significant results. We determine the morphological types of the host galaxies by performing photometric decomposition of NIR images using a 2D image decomposition algorithm GALFIT. We were able to sufficiently model five of the nine host galaxies. Based on the fitting parameters, mainly the Sérsic index, all of them are disk-like galaxies. Sources with clearly distinguishable bulge components all have pseudo-bulges, and four out of five sources show a component resembling a bar. A surprisingly large fraction, three out of five, show signs of interaction or disturbed morphology. Our results suggest that spiral galaxies with pseudo-bulges are able to launch and maintain powerful jets. They also imply that interaction -mainly minor mergers-may have a role in initially triggering higher levels of nuclear activity in NLS1 galaxies. Furthermore, our results support the heterogeneous nature of the NLS1 class and indicate that this diversity is caused by different evolutionary stages, possibly due to mergers.

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“…However Red spirals and Speca-like radio galaxies may still contain signs of their earliest behaviour like "vestigial organs". Indeed, existance of psudo-bulge in J2345-0449 and newly discovered, gamma-ray emitting, radio loud, narrow-line Seyfert 1 galaxy PKS 2004-447 firmly support secular evolutionary processes (not merger-driven) for these rare systems (Oshlack, Webster & Whiting (2001), Kormendy & Kennicutt (2004), Abdo et al 2009, Kotilainen et al, 2016. Thus, Speca-like galaxies may indeed be the "living fossil" or opportunity to learn about first massive spirals formed with massive black holes in their centres in the early Universe.…”

Section: Fig 8: Radio-optical Image Of Speca Based On Hota Et Al (mentioning

confidence: 89%