X-ray selected starbursts in the GOODS-North
| dc.creator | Georgakakis, A. | |
| dc.creator | Rowan-Robinson, M. | |
| dc.creator | Babbedge, T. S. R. | |
| dc.creator | Georgantopoulos, I. | |
| dc.date | 2007-02-05 | |
| dc.date.accessioned | 2026-07-07T10:21:44Z | |
| dc.date.available | 2026-07-07T10:21:44Z | |
| dc.description | We investigate claims that recent deep X-ray surveys are detecting starbursts at cosmologically interesting redshifts (z=0-1). We combine X-ray data from the 2Ms CDF-North with multi-wavelength observations from GOODS to build the SEDs (UV, optical, IR) of X-ray sources in this field. These are fit with model templates providing an estimate of the total IR luminosity of each source. We then exploit the correlation between IR and X-ray luminosities for star-forming galaxies, established in the local Universe, to select sources that are dominated by star-formation. This approach is efficient in discriminating normal galaxies from AGN over a wide range of SFRs. The resulting sample consists of 45 X-ray selected star-forming systems at a median redshift z~0.5, the majority of which (60%) are LIRGs or ULIRGs. This sample is least affected by incompleteness and AGN contamination and is well suited for cosmological studies. We quantify the X-ray evolution of these sources by constructing their differential, dN/dS, and comparing them with evolving luminosity function models. The results are consistent with luminosity evolution of the form (1+z)^{p} with p~2.4. This is similar to the evolution rate of star-forming galaxies selected at other wavelengths, suggesting that the deep X-ray surveys, are indeed finding the starburst galaxy population that drives the rapid evolution of the global SFR density in the range z~0-1. Our analysis also reveals a separate population of IR-faint X-ray sources. These include old galaxies but also systems that are X-ray luminous for their stellar mass compared to local E/S0. We argue that these may be post-starbursts that will, over time, become fainter at X-rays and will eventually evolve into early-type systems (e.g. E/S0). | |
| dc.description | Accepted for publication in MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0702132 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0702132 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.377:203-214,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2007.11590.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/175273 | |
| dc.subject | Astrophysics | |
| dc.title | X-ray selected starbursts in the GOODS-North | |
| dc.type | text |