Evolutionary Paths for Galaxies and AGNs: New Insights by the Spitzer Space Telescope
| dc.creator | Franceschini, A. | |
| dc.creator | Rodighiero, G. | |
| dc.creator | Berta, S. | |
| dc.creator | Cassata, P. | |
| dc.date | 2006-02-21 | |
| dc.date.accessioned | 2026-07-07T07:00:49Z | |
| dc.date.available | 2026-07-07T07:00:49Z | |
| dc.description | We compare the history of the galaxy mass build-up, as inferred from near-IR observations, and the Star Formation Rate of massive stars in the comoving volume traced by deep extensive far-IR surveys, both possible now with the Spitzer Space Telescope. These two independent and complementary approaches to the history of galaxy formation consistently indicate that a wide interval of cosmic epochs between z~0.7 to z~2 brackets the main evolutionary phases. The rate of the integrated galaxy mass growth indicated by the IR-based comoving SFR appears consistent with the observed decrease of the stellar mass densities with redshift. There are also indications that the evolution with z of the total population depends on galaxy mass, being stronger for moderate-mass, but almost absent up to z=1.4 for high-mass galaxies, thus confirming previous evidence for a "downsizing" effect in galaxy formation. The most massive galaxies appear already mostly in place by z~1. Although a precise matching of this galaxy build-up with the growth of nuclear super-massive black-holes is not possible with the present data (due to difficulties for an accurate census of the obscured AGN phenomenon), some preliminary indications reveal a similar mass/luminosity dependence for AGN evolution as for the hosting galaxies. | |
| dc.description | invited review at the Workshop on "AGN and galaxy evolution", Specola Vaticana, Castel Gandolfo, Italy, 3-6 October 2005 | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0602463 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0602463 | |
| dc.identifier | Mem.Soc.Ast.It. 75 (2004) 1 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/108093 | |
| dc.subject | Astrophysics | |
| dc.title | Evolutionary Paths for Galaxies and AGNs: New Insights by the Spitzer Space Telescope | |
| dc.type | text |