Whipple Observations of BL Lac Objects

Details Whipple Observations of BL Lac Objects Whipple Observations of BL Lac Objects

1999-07-20

arxiv.org/abs/astro-ph/9907263v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to be published in the proceedings of 26th International Cosmic Ray Conference (Salt Lake City, 1999)

Scientific paper

Only BL Lac objects have been detected as extragalactic sources of very high energy (E > 300 GeV) gamma rays. Using the Whipple Observatory Gamma-ray Telescope, we have attempted to detect more BL Lacs using three approaches. First, we have conducted surveys of nearby BL Lacs, which led to the detections of Mrk 501 and 1ES 2344+514. Second, we have observed X-ray bright BL Lacs when the RXTE All-Sky Monitor identifies high state X-ray emission in an object, in order to efficiently detect extended high emission states. Third, we have conducted rapid observations of several BL Lacs and QSOs located close together in the sky to search for very high flux, short time-scale flare states such as have been seen from Mrk 421. We will present the results of a survey using the third observational technique.

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