No color-morphology bimodality of AGN host galaxies
| dc.creator | Boehm, Asmus | |
| dc.creator | Wisotzki, Lutz | |
| dc.creator | team, the GEMS | |
| dc.date | 2006-12-12 | |
| dc.date.accessioned | 2026-07-07T06:34:39Z | |
| dc.date.available | 2026-07-07T06:34:39Z | |
| dc.description | It is still a matter of debate whether the properties of galaxies hosting an Active Galactic Nucleus (AGN) are different from the properties of quiescent galaxies. We constructed a sample of ~50 AGN at a mean redshift of <z>~0.6 that lack a detectable optical nucleus. This characteristic allows to study the properties of the host galaxies with much higher accuracy than in the case of "normal" AGN which show a prominent central point source in optical images. A comparison sample of X-ray faint, quiescent galaxies at intermediate redshifts shows a clear bimodality in terms of both rest-frame colors and morphological concentration indicators. In contrast to this, the AGN host galaxies comprise a large fraction of objects that have early-type morphologies but relatively blue rest-frame colors, possibly due to recent or ongoing star formation. A fraction of the "optically dull" AGN in our sample show evidence for kpc-scale absorption; low Supermassive Black Hole accretion rates are more likely in other cases. | |
| dc.description | 4 pages, 3 figures, to appear in the ASP Conference Series (proceedings of the "Cosmic Frontiers" conference held in Durham, UK, 31st July - 4th August 2006) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0612310 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0612310 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/99591 | |
| dc.subject | Astrophysics | |
| dc.title | No color-morphology bimodality of AGN host galaxies | |
| dc.type | text |