Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-28
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Astronomical Journal, scheduled for January 2005, for full-resolution figures see http://www
Scientific paper
10.1086/426371
We have cross-correlated X-ray catalogs derived from archival Chandra ACIS observations with a Sloan Digital Sky Survey (SDSS) Data Release 2 (DR2) galaxy catalog to form a sample of 42 serendipitously X-ray detected galaxies over the redshift interval 0.03 < z < 0.25. This pilot study will help fill in the "redshift gap" between local X-ray-studied samples of normal galaxies and those in the deepest X-ray surveys. Our chief purpose is to compare optical spectroscopic diagnostics of activity (both star-formation and accretion) with X-ray properties of galaxies. Our work supports a normalization value of the X-ray-star-formation-rate (X-ray-SFR) correlation consistent with the lower values published in the literature. The difference is in the allocation of X-ray emission to high-mass X-ray binaries relative to other components such as hot gas, low-mass X-ray binaries, and/or AGN. We are able to quantify a few pitfalls in the use of lower-resolution, lower signal-to-noise optical spectroscopy to identify X-ray sources (as has necessarily been employed for many X-ray surveys). Notably, we find a few AGN that likely would have been misidentified as non-AGN sources in higher-redshift studies. However, we do not find any X-ray hard, highly X-ray-luminous galaxies lacking optical spectroscopic diagnostics of AGN activity. Such sources are members of the "X-ray Bright, Optically Normal Galaxy" (XBONG) class of AGN.
Colbert Edward J. M.
Heckman Timothy M.
Hornschemeier Ann Elizabeth
Ptak Andrew F.
Tremonti Christy A.
No associations
LandOfFree
Chandra-SDSS Normal and Star-Forming Galaxies I: X-ray Source Properties of Galaxies Detected by Chandra in SDSS DR2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chandra-SDSS Normal and Star-Forming Galaxies I: X-ray Source Properties of Galaxies Detected by Chandra in SDSS DR2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra-SDSS Normal and Star-Forming Galaxies I: X-ray Source Properties of Galaxies Detected by Chandra in SDSS DR2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-344460