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Chandra Multiwavelength Project (ChaMP): Normal Galaxies at Intermediate Redshift

Published online by Cambridge University Press:  12 May 2006

D.-W. Kim ,
W. A. Barkhouse ,
P. J. Green ,
E. R. Colmenero ,
M. Kim ,
A. Mossman ,
E. Schlegel ,
J. D. Silverman ,
T. Aldcroft  and
C. Anderson
...Show all authors
D.-W. Kim
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
W. A. Barkhouse
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
P. J. Green
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
E. R. Colmenero
Affiliation:
South African Astronomical Observatory
M. Kim
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
A. Mossman
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
E. Schlegel
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
J. D. Silverman
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
T. Aldcroft
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
C. Anderson
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
H. Tananbaum
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
B. J. Wilkes
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA email: kim@cfa.harvard.edu
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Abstract

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We have investigated 136 Chandra extragalactic sources without broad emission lines, including 93 NELG and 43 ALG. Based on $f_X/f_O$, $L_X$, X-ray spectral hardness and optical emission line diagnostics, we have conservatively classified 36 normal galaxies (20 spirals and 16 ellipticals) and 71 AGNs. Their redshift ranges from 0.01 to 1.2, while normal galaxies are at z=0.01–0.3. Our sample galaxies appear to share similar characteristics with local galaxies in terms of X-ray luminosities and spectral properties, as expected from the X-ray binary populations and the hot ISM. In conjunction with normal galaxies found in other surveys, we found no statistically significant evolution in $L_X/L_B$, within the limited z range ($<$0.1). We have built our log(N)-log(S) relationship of normal galaxies in the flux range, $f_X$ (0.5–8.0) = $10^{-15}$–$10^{-13}$ erg sec$^{-1}$ cm$^{-2}$, after correcting completeness by a series of simulations. The best-fit slope is −1.5 for both soft (0.5–2.0 KeV) and broad (0.5–8.0 KeV) energy bands, which is considerably steeper than that of AGN-dominated cosmic background sources at faint fluxes, but slightly flatter than the previous estimate, indicating normal galaxies will exceed in number over the AGN population at $f_X<10^{-18}$ erg sec$^{-1}$ cm$^{-2}$.

Keywords

surveys – X-rays: galaxies – X-rays: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 434 - 437
Copyright
2006 International Astronomical Union