Results 101 to 110 of about 189,366 (258)

The Young, the Old, and the Dusty: Stellar Populations of AGN Hosts [PDF]

, 2011
Studying the average properties of active galactic nuclei (AGN) host stellar populations is an important step in understanding the role of AGN in galaxy evolution and the processes which trigger and fuel AGN activity. Here we calculate model spectral energy distributions (SEDs) that include emission from the AGN, the host galaxy stellar population, and
arxiv   +1 more source

The black holes of radio galaxies during the "Quasar Era": Masses, accretion rates, and evolutionary stage [PDF]

, 2010
We present an analysis of the AGN broad-line regions of 6 powerful radio galaxies at z>~2 (HzRGs) with rest-frame optical imaging spectroscopy obtained at the VLT. All galaxies have luminous (L(H-alpha)=few x 10^44 erg s^-1), spatially unresolved H-alpha
Best, Philip N., Binette, Luc, De Breuck, Carlos, Lehnert, Matt D., Nesvadba, Nicole P. H., Proga, Daniel   +5 more
core   +1 more source

Investigating the Star Formation Rates of Active Galactic Nucleus Hosts Relative to the Star-forming Main Sequence

The Astrophysical Journal
A fundamental question in galaxy and black hole evolution remains how galaxies and their supermassive black holes have evolved together over cosmic time.
Nathan Cristello, Fan Zou, W. N. Brandt, Chien-Ting J. Chen, Joel Leja, Qingling Ni, Guang Yang   +6 more
doaj   +1 more source

Revisiting the Properties of X-Ray Active Galactic Nuclei in the SSA22 Protocluster: Normal Supermassive Black Hole and Host-galaxy Growth for AGNs in a z = 3.09 Overdensity

The Astrophysical Journal, 2023
We analyze the physical properties of eight X-ray-selected active galactic nuclei (AGNs) and one candidate protoquasar system (ADF22A1) in the z = 3.09 SSA22 protocluster by fitting their X-ray-to-IR spectral energy distributions (SEDs) using our SED ...
Erik B. Monson, Keith Doore, Rafael T. Eufrasio, Bret D. Lehmer, David M. Alexander, Chris M. Harrison, Mariko Kubo, Cristian Saez, Hideki Umehata   +8 more
doaj   +1 more source

A Catalog of 406 AGNs in MaNGA: A Connection between Radio-mode AGN and Star Formation Quenching [PDF]

, 2020
Accurate active galactic nucleus (AGN) identifications and spatially resolved host galaxy properties are a powerful combination for studies of the role of AGNs and AGN feedback in the coevolution of galaxies and their central supermassive black holes.
arxiv   +1 more source

Morphologies of Radio, X-Ray, and Mid-Infrared Selected AGN

, 2010
We investigate the optical morphologies of candidate active galaxies identified at radio, X-ray, and mid-infrared wavelengths. We use the Advanced Camera for Surveys General Catalog (ACS-GC) to identify 372, 1360, and 1238 AGN host galaxies from the VLA,
Alonso-Herrero, Ashby, Barth, Civano, Comerford, Comerford, Courbin, Daniel Stern, Donley, Donley, Eckart, Eckart, Eisenhardt, Faure, Fazio, Ferrarese, Gabor, Gebhardt, Gerke, Giavalisco, Hasinger, Hickox, Hopkins, Häussler, Koekemoer, Kollmeier, Komossa, Kormendy, Kormendy, Lacy, Magorrian, Marconi, Peng, Pentericci, Rieke, Roger L. Griffith, Sanders, Schechter, Schinnerer, Schneider, Scoville, Stern, Stern, Sérsic, Xu, York, Young   +46 more
core   +1 more source

The Evolution of AGN and Their Host Galaxies

, 2016
Active galaxies have been in the forefront of astronomic research since their first discovery, at least 50 years ago (e.g. Schmidt, 1963; Matthews & Sandage, 1963). The putative supermassive black hole (SMBH) at their center characterizes their properties and regulates the evolution of these objects.
openaire   +3 more sources

Black Hole Mass, Host galaxy classification and AGN activity

, 2010
We investigate the role of host galaxy classification and black hole mass in a heterogeneous sample of 276 mostly nearby ...
Antonucci, Arnold, B. McKernan, Bagley, Bournaud, Buta, C. S. Reynolds, Ciotti, Ciotti, Ciotti, DeVaucouleurs, Dong, Dressler, Edelson, Elmegreen, Eracleous, Eskridge, Gabor, Gandhi, Georgakakis, González-Martín, Graham, Grogin, Gultekin, Hasan, Ho, Ho, Hopkins, Hopkins, Horst, Hui, Hunt, Hunt, K. E. S. Ford, Kauffmann, Kauffmann, Kewley, Kim, Kochanek, Kormendy, Kormendy, Krips, Krolik, Krolik, Krongold, Lewis, Maia, Martínez, McKernan, McKernan, McKernan, McKernan, McKernan, Miller, Miller, Peterson, Peterson, Pierce, Portegies-Zwart, Rossi, Sanders, Satyapal, Satyapal, Schawinski, Shankar, Shapley, Sijacki, Stasińska, Tang, Temi, Terashima, Tueller, Turner, Urry, Veilleux, Weaver, Winter, Younger, Yuan   +78 more
core   +1 more source

Host galaxy properties of radio selected AGN [PDF]

Proceedings of the International Astronomical Union, 2013
AbstractWith the goal of investigating the link between black hole (BH) and star formation (SF) activity, we study a deep sample of radio selected star forming galaxies (SFGs) and active galactic nuclei (AGNs). Using a multi-wavelength approach we characterize their host galaxies properties (stellar masses, optical colors, and morphology).
S. Vattakunnel, Piero Rosati, M. Bonzini, Vincenzo Mainieri, N. Miller, Paolo Padovani, Paolo Tozzi, K. I. Kellermann   +7 more
openaire   +2 more sources

Star formation characteristics of galaxies hosting AGN

, 2023
We present an analysis of the ultra-violet (UV) observations of two Seyfert type active galactic nuclei (AGN), namely NGC$~$4051 and NGC$~$4151. These observations aimed at studying the star formation in the hosts of these AGN were carried out with the ultra-violet imaging telescope on board AstroSat in far-UV.
Nandi, Payel, Stalin, C. S.
openaire   +2 more sources