Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre11010f&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Blazars have traditionally been separated into two broad categories based upon their optical emission characteristics. Blazars with faint or no emission lines are referred to as BL Lacs, and the blazers with prominent, broad emission lines are commonly referred to as flat spectrum radio quasars (FSRQs). Based on recent surveys, it has been suggested that this distinction is merely a selection effect and that emission line luminosities of blazars are actually a continuous function. The spectral energy distribution of FSRQs has generally been thought of as being more akin to the low-peaked BL Lacs, which experience a peak in the infrared region of the spectrum, as opposed to high-peaked BL Lacs (HBLs), which experience a peak in UV/X-ray region of the spectrum. All of the blazers that are currently known to emit TeV radiation fall into the HBL category. Recent surveys have found several FSRQs that exhibit spectral properties similar to HBLs. These objects are potential sources of TeV emission and could have a significant impact on our understanding of the nature of objects that are capable of TeV emission. The Whipple 10 meter imaging air-cherenkov gamma-ray observatory, with its 490 pixel high resolution camera, is well suited for TeV gamma-ray observations. Using the Whipple telescope, we have taken data on two nearby (z<0.1) high-peaked FSRQs, B2 0321+33 and PG2209+184, during the 2001-2002 observing season. The results of these observations will be presented, along with plans to continue with a TeV survey of nearby, high-peaked FSRQs.
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