Optical vs. X-ray Evidence for Absorption in the ChaMP

Details Optical vs. X-ray Evidence for Absorption in the ChaMP Optical vs. X-ray Evidence for Absorption in the ChaMP

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.6301g&link_type=abstract

American Astronomical Society Meeting 203, #63.01; Bulletin of the American Astronomical Society, Vol. 35, p.1309

Astronomy and Astrophysics

Astronomy

Scientific paper

X-ray selected AGN possess a wide range of absorption properties that challenge and broaden the concepts of AGN Unification. Objects that seem unabsorbed optically can show evidence for large absorbing columns in the X-rays, while heavily optically-reddened objects may show little such evidence. Most previous samples are heterogeneous both in selection and measurement. The Chandra Multiwavelength Project (ChaMP) is producing a large sample of X-ray selected AGN out to redshift 5 via deep optical follow-up of serendipitous sources in the Chandra archive. We report here on X-ray spectral constraints for objects with measured redshifts to investigate the correlation of total gas absorption column with a number of observables and physical properties: luminosity, redshift, spectral class, and optical colors from our NOAO 4-meter multiband imaging. We gratefully acknowledge support for the ChaMP from NASA under CXC archival research grant AR2-3009X, and for Chandra under CXC contract, NAS8-39073.

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