Results 61 to 70 of about 189,366 (258)
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 +30 more
core +3 more sources
The Astrophysical Journal Letters, 2023 The Cosmic Evolution Early Release Science program observed the Extended Groth Strip (EGS) with the Mid-Infrared Instrument (MIRI) on the James Webb Space Telescope (JWST) in 2022.
Allison Kirkpatrick +35 more
doaj +1 more source
Method for Determining AGN Accretion Phase in Field Galaxies [PDF]
, 2016 Recent observations of AGN activity in massive galaxies (log Mstar / Msun > 10.4) show that: 1) at z < 1, AGN-hosting galaxies do not show enhanced merger signatures compared to normal galaxies, 2) also at z < 1, most AGNs are hosted by quiescent galaxies; and 3) at z > 1, percentage of AGNs in star forming galaxies increases and becomes comparable to ...
arxiv +1 more source
Image decomposition of barred galaxies and AGN hosts [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 I present the results of multi-component decomposition of V and R broadband images of a sample of 17 nearby galaxies, most of them hosting bars and active galactic nuclei. I use BUDDA v2.1 to produce the fits, allowing to include bars and AGN in the models. A comparison with previous results from the literature shows a fairly good agreement.
openaire +4 more sources
AGN host galaxies at redshiftz ≈ 0.7: peculiar or not? [PDF]
Astronomy & Astrophysics, 2012 Accepted for publication in Astronomy and Astrophysics; 17 pages, 30 figures; reposted with affiliation updates and language ...
John A. R. Caldwell +25 more
openaire +6 more sources
Pair-Matching of Radio-Loud and Radio-Quiet AGNs
Frontiers in Astronomy and Space Sciences, 2017 Active galactic nuclei (AGNs) are known to cover an extremely broad range of radio luminosities and the spread of their radio-loudness is very large at any value of the Eddington ratio.
Dorota Kozieł-Wierzbowska +5 more
doaj +1 more source
Host Galaxies of the High-redshift AGNs in the GOODS Fields [PDF]
Astrophys.J. 629 (2005) 72-87, 2005 The star-formation rates and the stellar masses of the host galaxies of AGNs at high-redshifts are keys to understanding the evolution of the relation between the mass of the spheroidal component of a galaxy and the mass of its central black hole. We investigate the host galaxies of 31 AGNs with spectroscopic redshifts between 2 and 4 found in the deep
arxiv +1 more source
Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers
Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto +9 more
wiley +1 more source
Active Galactic Nuclei in the Green Valley at z ∼ 0.7
The Astrophysical JournalWe present near-infrared (NIR) spectroscopy using the MMT and Magellan infrared spectrograph for a sample of 29 massive galaxies ( $\mathrm{log}\ {M}_{* }/{M}_{\odot }\gtrsim 10$ ) at z ∼ 0.7 with optical spectroscopy from the Large Early Galaxy ...
Charity Woodrum +7 more
doaj +1 more source
Why are active galactic nuclei and host galaxies misaligned? [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 8 pages, 4 figures, accepted to MNRAS (moderate revisions to match accepted version)
Hopkins, P. F. +3 more
openaire +5 more sources