Results 21 to 30 of about 31,838 (235)

The smallest AGN host galaxies [PDF]

New Astronomy Reviews, 2006
We describe our efforts to study dwarf galaxies with active nuclei, whose black holes, with masses < 10^6 M_sun, provide the best current observational constraints on the mass distribution of primordial seed black holes. Although these low-mass galaxies do not necessarily contain classical bulges, Barth, Greene, & Ho (2005) show that their ...
Greene, J. E., Barth, A. J., Ho, L. C.
openaire   +2 more sources

Relation between AGN type and host galaxy properties [PDF]

Astronomy & Astrophysics, 2021
We use 3213 active galactic nuclei (AGNs) from the XMM-XXL northern field to investigate the relation of AGN type with host galaxy properties. Applying a Bayesian method, we derive the hardness ratios, and through these the hydrogen column density (NH) for each source. We consider those with NH > 1021.5 cm−2 as absorbed sources (type 2).
Masoura, V. A., Mountrichas, G., Georgantopoulos, I., Plionis, M.   +3 more
openaire   +3 more sources

Overmassive Black Holes in Dwarf Galaxies Out to z ∼ 0.9 in the VIPERS Survey

The Astrophysical Journal Letters, 2023
Supermassive black holes (SMBHs) are thought to originate from early universe seed black holes of mass M _BH ∼ 10 ^2 –10 ^5 M _⊙ and grown through cosmic time. Such seeds could be powering the active galactic nuclei (AGN) found in today’s dwarf galaxies.
Mar Mezcua, Malgorzata Siudek, Hyewon Suh, Rosa Valiante, Daniele Spinoso, Silvia Bonoli   +5 more
doaj   +1 more source

AGN-host galaxy connection: multiwavelength study [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractThe connection between active galactic nuclei (AGN) and their hosts showed to be important for understanding the formation and evolution of active galaxies. Using X–ray and deep optical data, we study how morphology and colours are related to X–ray properties at redshifts z≤2.0 for a sample of > 300 X–ray detected AGN in the Subaru/XMM ...
M. Pović, M. Sánchez-Portal, A. M. Pérez García, A. Bongiovanni, J. Cepa   +4 more
openaire   +1 more source

GALAXIES ON DIET: FEEDBACK SIGNATURES IN RADIO-AGN HOST GALAXIES [PDF]

Publications of The Korean Astronomical Society, 2017
There exists strong evidence supporting the co-evolution of central supermassive black holes and their host galaxies; however it is still under debate how such a relation comes about and whether it is relevant for all or only a subset of galaxies. An important mechanism connecting AGN to their host galaxies is AGN feedback, potentially heating up or ...
Karouzos, Marios, Im, Myungshin, Trichas, Markos, Goto, Tomogotsu, Malkan, Matthew, Ruiz, Angel, Jeon, Yiseul, Kim, Ji Hoon, Lee, Hyung Mok, Kim, Seong Jin, Oi, Nagisa, Matsuhara, Hideo, Takagi, Toshinobu, Murata, Kazumi, Wada, Takehiko, Wada, Kensuke, Shim, Hyunjin, Hanami, Hitoshi, Serjeant, Stephen, White, Glenn, Pearson, Chris, Ohyama, Youichi   +21 more
openaire   +2 more sources

AGN spiral galaxies in groups: effects of bars [PDF]

, 2014
We explore properties of barred active spiral galaxies in groups selected from the SDSS-DR7, with the aim of assessing the effects of bars on AGN and the role of the high density environment.
Alonso, Sol, Coldwell, Georgina, Lambas, Diego García   +2 more
core   +4 more sources

A Census of WISE-selected Dual and Offset AGNs Across the Sky: New Constraints on Merger-driven Triggering of Obscured AGNs

The Astrophysical Journal, 2023
Pairs of galaxies hosting active galactic nuclei (AGNs) are powerful probes of merger-driven supermassive black hole (SMBH) growth as they can resolve individual AGNs and trace mergers over a large range of physical separations.
R. Scott Barrows, Julia M. Comerford, Daniel Stern, Roberto J. Assef   +3 more
doaj   +1 more source

CLEAR: Spatially Resolved Emission Lines and Active Galactic Nuclei at 0.6 < z < 1.3

The Astrophysical Journal, 2023
We investigate spatially resolved emission-line ratios in a sample of 219 galaxies (0.6 < z < 1.3) detected using the G102 grism on the Hubble Space Telescope Wide Field Camera 3 taken as part of the CANDELS Ly α Emission at Reionization survey to ...
Bren E. Backhaus, Joanna S. Bridge, Jonathan R. Trump, Nikko J. Cleri, Casey Papovich, Raymond C. Simons, Ivelina Momcheva, Benne W. Holwerda, Zhiyuan Ji, Intae Jung, Jasleen Matharu   +10 more
doaj   +1 more source

Do Moderate-Luminosity Active Galactic Nuclei Suppress Star Formation? [PDF]

, 2009
The growth of supermassive black holes and their host galaxies are thought to be linked, but the precise nature of this symbiotic relationship is still poorly understood. Both observations and simulations of galaxy formation suggest that the energy input
Adelman-McCarthy, Anderson, Antonucci, Bronika Kushkuley, Brooke Simmons, Bundy, C. Megan Urry, Conselice, Constantin, Ezequiel Treister, Ferrarese, Gebhardt, Gehrels, Hopkins, Häring, Johansson, Kaviraj, Kaviraj, Kevin Schawinski, Li, Martini, Martini, Nandra, Peng, Salim, Schawinski, Schawinski, Shanil Virani, Silverman, Simmons, Sugata Kaviraj, Treister, Tueller, Voges, Wild, Yi, York   +36 more
core   +4 more sources

The triggering probability of radio-loud AGN: A comparison of high and low excitation radio galaxies in hosts of different colors [PDF]

, 2012
Low luminosity radio-loud active galactic nuclei (AGN) are generally found in massive red elliptical galaxies, where they are thought to be powered through gas accretion from their surrounding hot halos in a radiatively inefficient manner.
Abazajian, Baldwin, Balogh, Becker, Best, Best, Best, Best, Brinchmann, Condon, Croton, Evans, H. J. A. Röttgering, Hardcastle, Hickox, J. Brinchmann, Kauffmann, Kauffmann, Kauffmann, Martin, Matthews, P. N. Best, R. M. J. Janssen, Schmidt, Stoughton, Strateva, Strauss, Tadhunter, Tasse, Whysong, York   +30 more
core   +3 more sources