An Optical Survey of Potential Gamma-ray Sources

Details An Optical Survey of Potential Gamma-ray Sources An Optical Survey of Potential Gamma-ray Sources

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0815c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #08.15; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

The EGRET instrument aboard the Compton Gamma-Ray Observatory detected 271 sources. Several objects were identified as "high-confidence" AGN, quasars, and low-confidence AGN. 170 sources remain unidentified (Hartman et al. 1999). Our project is to conduct an optical survey of unidentified sources, looking for evidence of blazar activity that may have been missed by the initial EGRET survey. The method of identifying sources used by the EGRET survey was to search for radio spectra peaking at 5 GHz. Such a spectrum is evidence of blazar-like activity. However, a study by Mattox et al. (1997); Mattox, Hartman & Reimer (2001) concluded that any gamma-ray source with a flux density less than 500 mJy at 5 GHz would be difficult to positively identify.
The method described above neglects the possibility that blazar-like sources may be dim at such low frequencies and peak instead at higher frequencies (at least 200 Ghz). It has been hypothesized that sources that behave in this way could very well be counterparts to gamma-ray blazars (Tornikoski et al. 2002; Bloom et al. 1997, 2000). Our goal is to determine the magnitudes of objects in the optical wavelengths and check for evidence of
blazar-like activity.

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