AAS 203rd Meeting, January 2004
Session 63 AGN
Oral, Tuesday, January 6, 2004, 10:00-11:30am, Regency VII

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

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.

If you would like more information about this abstract, please follow the link to http://hea-www.harvard.edu/CHAMP/. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

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.