Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335503h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #355.03; Bulletin of the American Astronomical Society, Vol. 41, p.497
Other
Scientific paper
The LAT pair-creation telescope aboard the Fermi Gamma-ray Space Telescope has detected many sources at high Galactic latitude in the first few months of operation. With the small LAT error circles derived from the good PSF and large effective area at high energy, over 100 of these sources have a high-confidence positional association with lower-energy counterparts. The majority of the associated sources are from the radio-loud flat-spectrum blazar class that dominated the EGRET extragalactic sky. However, most of the current sources were not active in the EGRET era. This, and the typically high source variability, demonstrate that the GeV sky is very dynamic. We describe early efforts to find other classes of AGN and discuss the relative numbers of flat spectrum radio quasars (FSRQ), BL Lac objects, and radio galaxies. We summarize some general trends in the source activity, contrast the early LAT blazars with the EGRET sample, and estimate the size of the blazar population available for study at the end of the first-year sky survey.
Fermi LAT Collaboration
Healey Stephen E.
Romani Roger W.
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