SIMBAD references

2006MNRAS.367.1017G - Mon. Not. R. Astron. Soc., 367, 1017-1028 (2006/April-2)

Mining for normal galaxies in the first XMM-Newton Serendipitous Source Catalog.


Abstract (from CDS):

This paper uses the first XMM-Newton Serendipitous Source Catalog compiled by the XMM-Newton Science Centre to identify low-z X-ray selected normal galaxy candidates. Our sample covers a total area of ~6deg2 to the 0.5-2keV limit ~10–15erg/s/cm2. A total of 23 sources are selected on the basis of low X-ray to optical flux ratio logfX/fopt< -2, soft X-ray spectral properties and optical spectra, when available, consistent with stellar formation rather than active galactic nucleus (AGN) processes. This sample is combined with similarly selected systems from the Needles in the Haystack Survey to provide a total of 46 unique (z≲ 0.2) X-ray detected normal galaxies, the largest low-z sample yet available. This is first used to constrain the normal galaxy logN-logS at bright fluxes (10–15-10–13erg/s/cm2). We estimate a slope of -1.46 ±0.13 for the cumulative number counts consistent with the Euclidean prediction. We further combine our sample with 23 local (z≲ 0.2) galaxies from the Chandra Deep Field-North and -South surveys to construct the local X-ray luminosity function of normal galaxies. A Schechter form provides a good fit to the data with a break at logL*= 41.02+0.14–0.12erg/s and a slope of α=-1.76±0.10. Finally, for the sample of 46 systems, we explore the association between X-ray luminosity and host galaxy properties, such as star formation rate (SFR) and stellar mass. We find that the LXof the emission-line systems correlates with Hα luminosity and 1.4-GHz radio power, both providing an estimate of the current SFR. In the case of early-type galaxies with absorption-line optical spectra, we use the K band as an approximation of stellar mass and find a correlation of the form LXL1.5K. This is flatter than the LX-LB relation for local ellipticals. This may be due to either LK providing a better approximation of galaxy mass or selection effects biasing our sample against very luminous early-type galaxies, LX> 1042erg/s.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): surveys - X-rays: galaxies - X-rays: general

Nomenclature: Table 1: [GCP2006] ANNN N=32 among (Nos A001-A173).

Simbad objects: 37

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