Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743019k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #430.19; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
A large fraction of objects in the universe vary in brightness as a function of time. Whereas Kozlowski et al. (2010) investigated a large sample of variable AGN with the Spitzer Space Telescope in the mid-IR for the first time, the WISE telescope can probe AGN variability at much shorter time scales, ranging from hours to months. Also, WISE is an all-sky survey, and thereby provides a much larger catalogue of infrared sources to analyze. A comprehensive list of quasi-stellar objects was generated using the NASA/IPAC Extragalactic Database. The light curves of these 132,851 objects were obtained using WISE observations and the standard deviation of the flux for each object was calculated. We consider sources in different variability levels where these variability levels correspond to the objects’ deviation from the median standard deviation values of the light curve. In addition, we compute the variability of the objects over different time scales and compare the results to Kozlowski et al. (2010) to observe how variability of AGNs evolve over a period of hours to months. We present light curves of the most variable objects in our sample and characterize the variability of all the objects as a function of time.
Cutri Roc M.
Hoffman David
Koshy Sam
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