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P.J. Green, T.L. Aldcroft, J.D. Silverman, D.-W. Kim, W.A. Barkhouse, R.A. Cameron (SAO), H. Ghosh (OSU), B. Jannuzi (NOAO), A. Mossman, B.J. Wilkes (SAO), ChaMP Collaboration
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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The author(s) of this abstract have provided an email address for comments about the abstract: pgreen@cfa.harvard.edu
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.