Results 71 to 80 of about 159,044 (227)
The Astrophysical JournalEffectively finding and identifying active galactic nuclei (AGNs) in dwarf galaxies is an important step in studying black hole formation and evolution.
Megan R. Sturm +2 more
doaj +1 more source
BH Accretion in Low-Mass Galaxies Since z~1 [PDF]
, 2008 We have selected a sample of X-ray emitting active galactic nuclei (AGNs) in low-mass host galaxies (5e9-2e10 Msun) out to z~1. By comparing to AGNs in more massive hosts, we have found that the AGN spatial number density and the fraction of galaxies hosting AGNs depends strongly on the host mass, with the AGN host mass function peaking at intermediate
arxiv +1 more source
The Astrophysical JournalA fundamental question in galaxy and black hole evolution remains how galaxies and their supermassive black holes have evolved together over cosmic time.
Nathan Cristello +6 more
doaj +1 more source
Towards a Complete Census of AGNs in Nearby Galaxies: A Large Population of Optically Unidentified AGNs [PDF]
, 2009 Using Spitzer-IRS spectroscopy, we investigate the ubiquity of Active Galactic Nuclei (AGN) in a complete (~94%), volume-limited sample of the most bolometrically-luminous galaxies (L_IR > (0.3-20) x 10^10 L_sun) to D < 15 Mpc. Our analyses are based on the detection of the high-excitation emission line [NeV](\lambda 14.32 um; 97.1 eV) to unambiguously
arxiv +1 more source
Comparing the host galaxy ages of X-ray selected AGN in COSMOS
Astronomy & Astrophysics, 2023 We explore the properties of the host galaxies of X-ray selected AGN in the COSMOS field using the Chandra Legacy sample and the LEGA-C survey VLT optical spectra. Our main goal is to compare the relative ages of the host galaxies of the obscured and unobscured AGN by means of the calcium break Dn(4000) and the Hδ Balmer line.
Georgantopoulos, I. +5 more
openaire +4 more sources
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 +8 more
doaj +1 more source
On the Host Galaxy of GRB 150101B and the Associated Active Galactic Nucleus [PDF]
, 2016 We present a multi-wavelength analysis of the host galaxy of short-duration gamma-ray burst (GRB) 150101B. Follow-up optical and X-ray observations suggested that the host galaxy, 2MASX J12320498-1056010, likely harbors a low-luminosity active galactic nuclei (AGN).
arxiv +1 more source
Agn & Host Galaxy Scaling Relations
, 2018 IBISCO is a new multi-dimensional study of AGN scaling relations in a complete unbiased sample of local AGN, carried-on with IRAM, ALMA and INTEGRAL. For the first time we have included the information on the molecular gas reservoirs into the scaling relations between AGN and host galaxy properties.
Feruglio, Chiara +14 more
openaire +2 more sources
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 ...
Otelo Team +5 more
openaire +2 more sources
The Morphology of Dwarf Galaxies Hosting Variable Active Galactic Nuclei
The Astrophysical JournalWe analyze Hubble Space Telescope optical imaging of eight low-mass galaxies hosting active galactic nuclei (AGN) identified via their photometric variability in V. F. Baldassare et al.
Erin Kimbro +4 more
doaj +1 more source