scholarly journals The Host Galaxies of Narrow-Line Seyfert 1 Galaxies: Nuclear Dust Morphology and Starburst Rings

2006 ◽  
Vol 132 (1) ◽  
pp. 321-346 ◽  
Author(s):  
R. P. Deo ◽  
D. M. Crenshaw ◽  
S. B. Kraemer
Keyword(s):  
Narrow Line ◽  
Host Galaxies ◽  
Nuclear Dust

Host Galaxies and Environment of Narrow Line Seyfert 1 Nuclei

2001 ◽  
pp. 273-275
Author(s):  
Y. Krongold ◽  
D. Dultzin-Hacyan ◽  
P. Marziani
Keyword(s):  
Narrow Line ◽  
Host Galaxies

scholarly journals THE ROLE OF RADIATION PRESSURE IN THE NARROW LINE REGIONS OF SEYFERT HOST GALAXIES

2016 ◽  
Vol 824 (1) ◽  
pp. 50 ◽  
Author(s):  
Rebecca L. Davies ◽  
Michael A. Dopita ◽  
Lisa Kewley ◽  
Brent Groves ◽  
Ralph Sutherland ◽  
...  
Keyword(s):  
Radiation Pressure ◽  
Narrow Line ◽  
Host Galaxies

scholarly journals The supermassive black hole coincident with the luminous transient ASASSN-15lh

2018 ◽  
Vol 610 ◽  
pp. A14 ◽  
Author(s):  
T. Krühler ◽  
M. Fraser ◽  
G. Leloudas ◽  
S. Schulze ◽  
N. C. Stone ◽  
...  
Keyword(s):  
Black Hole ◽  
Stellar Population ◽  
Physical Nature ◽  
Central Component ◽  
Narrow Line ◽  
Host Galaxies ◽  
Ionization Source ◽  
Supermassive Black Hole ◽  
Gas Kinematics ◽  
Spatially Resolved

The progenitors of astronomical transients are linked to a specific stellar population and galactic environment, and observing their host galaxies hence constrains the physical nature of the transient itself. Here, we use imaging from the Hubble Space Telescope, and spatially resolved, medium-resolution spectroscopy from the Very Large Telescope obtained with X-shooter and MUSE to study the host of the very luminous transient ASASSN-15lh. The dominant stellar population at the transient site is old (around 1 to 2 Gyr) without signs of recent star formation. We also detect emission from ionized gas, originating from three different, time invariable, narrow components of collisionally excited metal and Balmer lines. The ratios of emission lines in the Baldwin-Phillips-Terlevich diagnostic diagram indicate that the ionization source is a weak active galactic nucleus with a black hole mass of M• = 5-3+8 × 108 M⊙, derived through the M•-σ relation. The narrow line components show spatial and velocity offsets on scales of 1 kpc and 500 km s-1, respectively; these offsets are best explained by gas kinematics in the narrow-line region. The location of the central component, which we argue is also the position of the supermassive black hole, aligns with that of the transient within an uncertainty of 170 pc. Using this positional coincidence as well as other similarities with the hosts of tidal disruption events, we strengthen the argument that the transient emission observed as ASASSN-15lh is related to the disruption of a star around a supermassive black hole, most probably spinning with a Kerr parameter a• ≳ 0.5.

scholarly journals WISE colours and star formation in the host galaxies of radio-loud narrow-line Seyfert 1

2015 ◽  
Vol 451 (2) ◽  
pp. 1795-1805 ◽  
Author(s):  
A. Caccianiga ◽  
S. Antón ◽  
L. Ballo ◽  
L. Foschini ◽  
T. Maccacaro ◽  
...  
Keyword(s):  
Star Formation ◽  
Narrow Line ◽  
Host Galaxies

scholarly journals THE HOST GALAXIES AND NARROW-LINE REGIONS OF FOUR DOUBLE-PEAKED [OIII] AGNs

2015 ◽  
Vol 149 (3) ◽  
pp. 92 ◽  
Author(s):  
Carolin Villforth ◽  
Fred Hamann
Keyword(s):  
Narrow Line ◽  
Host Galaxies

scholarly journals Spatially Resolved Spectroscopy of Narrow-line Seyfert 1 Host Galaxies

2017 ◽  
Vol 848 (1) ◽  
pp. 35 ◽  
Author(s):  
J. Scharwächter ◽  
B. Husemann ◽  
G. Busch ◽  
S. Komossa ◽  
M. A. Dopita
Keyword(s):  
Narrow Line ◽  
Host Galaxies ◽  
Spatially Resolved ◽  
Spatially Resolved Spectroscopy

Host Galaxies and Circumgalactic Environment of “Narrow Line” Seyfert 1 Nuclei

2001 ◽  
Vol 121 (2) ◽  
pp. 702-709 ◽  
Author(s):  
Y. Krongold ◽  
D. Dultzin-Hacyan ◽  
P. Marziani
Keyword(s):  
Narrow Line ◽  
Host Galaxies

scholarly journals The disc-like host galaxies of radio-loud narrow-line Seyfert 1s

2019 ◽  
Vol 492 (1) ◽  
pp. 1450-1464 ◽  
Author(s):  
Alejandro Olguín-Iglesias ◽  
Jari Kotilainen ◽  
Vahram Chavushyan
Keyword(s):  
Near Infrared ◽  
Brightness Distribution ◽  
Morphological Properties ◽  
Narrow Line ◽  
Host Galaxies ◽  
Relativistic Jets ◽  
Optical Telescope ◽  
Spectrum Radio ◽  
Γ Rays ◽  
Minor Mergers

ABSTRACT Until recently, relativistic jets were ubiquitously found to be launched from giant elliptical galaxies. However, the detection by the Fermi-LAT of γ-ray emission from radio-loud narrow-line Seyfert 1 (RL-NLSy1) galaxies raised doubts on this relation. Here, we morphologically characterize a sample of 29 RL-NLSy1s (including 12 γ-emitters, γ-NLSy1s) in order to find clues on the conditions needed by active galactic nuclei (AGNs) to produce relativistic jets. We use deep near-infrared images from the Nordic Optical Telescope and the ESO VLT to analyse the surface brightness distribution of the galaxies in the sample. We detected 72 per cent of the hosts (24 per cent classified as γ-NLSy1s). Although we cannot rule out that some RL-NLSy1s are hosted by dispersion-supported systems, our findings strongly indicate that RL-NLSy1 hosts are preferentially disc galaxies. 52 per cent of the resolved hosts (77 per cent non-γ-emitters and 20 per cent γ-emitters) show bars with morphological properties (long and weak) consistent with models that promote gas inflows, which might trigger nuclear activity. The extremely red bulges of the γ-NLSy1s, and features that suggest minor mergers in 75 per cent of their hosts, might hint to the necessary conditions for γ-rays to be produced. Among the features that suggest mergers in our sample, we find six galaxies that show offset stellar bulges with respect to their AGNs. When we plot the nuclear versus the bulge magnitude, RL-NLSy1s locate in the low-luminosity end of flat spectrum radio quasars, suggesting a similar accretion mode between these two AGN types.

The Host Galaxies of Narrow-Line Seyfert 1 Galaxies: Evidence for Bar-Driven Fueling

2003 ◽  
Vol 126 (4) ◽  
pp. 1690-1698 ◽  
Author(s):  
D. M. Crenshaw ◽  
S. B. Kraemer ◽  
J. R. Gabel
Keyword(s):  
Narrow Line ◽  
Host Galaxies

Hosts of jetted narrow-line Seyfert 1 galaxies in near-infrared

2019 ◽  
Vol 15 (S356) ◽  
pp. 172-172
Author(s):  
Emilia Järvelä
Keyword(s):  
Active Galactic Nuclei ◽  
Near Infrared ◽  
Small Sample Size ◽  
Galactic Nuclei ◽  
Small Sample ◽  
Host Galaxy ◽  
Narrow Line ◽  
Host Galaxies ◽  
Optical Telescope ◽  
Radio Observatory

AbstractHost galaxy morphology studies of jetted narrow-line Seyfert 1 galaxies (NLS1) are scarce. Although it seems that they are mostly hosted by late-type galaxies the results remain inconclusive, mostly due to the small sample size. Increasing the number of studied sources is crucial to achieve statistically significant results and to establish a preferred host type for jetted NLS1s. To this end we observed the host galaxies of nine NLS1s in near-infrared using NOTCam at the Nordic Optical Telescope. Seven of these sources are jetted based on the 37 GHz observations at Metsähovi Radio Observatory, Finland. To determine the morphological types of the hosts we performed photometric decomposition of the near-infrared images using GALFIT. Here we present the results of the host galaxy modelling, discuss the importance of this study to our understanding of the nature of the diverse NLS1 population, as well as its significance and implications for active galactic nuclei research in general.

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