Computer Science – Graphics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822817y&link_type=abstract
American Astronomical Society, AAS Meeting #218, #228.17; Bulletin of the American Astronomical Society, Vol. 43, 2011
Computer Science
Graphics
Scientific paper
The 4Ms Chandra Deep Field-South (CDF-S) Catalog is ideally suited to explore long-term variability in AGN and galaxies. Variability is a powerful tool for detecting AGN in "galaxy"-like sources, and spectral variability is capable of providing significant insight into AGN structure. We explore flux and spectral variability over month to year timescales by dividing the CDF-S observations into four epochs, each approximately 1Ms in duration: 2000, 2007, 2010a (March-May), and 2010b (May-July). Main results: 1) We confirm that most AGN with sufficient statistics are variable - AGN variability increases with net counts to >70% variability in sources with total net counts greater than 300. 2) A significant fraction of sources classified as "galaxies” exhibit AGN-like variability, up to 60% in sources with greater than 25 net counts, including a number of "optically bright, X-ray faint” (OBXF) galaxies. 3) Spectral variability is common, and exhibits a variety of behaviors relative to flux. We will discuss these results with respect to AGN structure and demographics.
Brandt Niel
CDF-S Team
Luo Baorong
Xue Yifeng
Young Monica
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