The Crab Nebula as a Standard Candle for TeV gamma-ray astronomy

Details The Crab Nebula as a Standard Candle for TeV gamma-ray astronomy The Crab Nebula as a Standard Candle for TeV gamma-ray astronomy

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..apr.j7003w&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #J7.003

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Since its discovery as a TeV gamma-ray source (Weekes et al., (1989) ApJ,342, 379), the Crab Nebula has been routinely observed with the Whipple 10m gamma-ray telescope in order to calibrate observations on other variable TeV sources. The assumption that the Crab can be regarded as a standard candle has been called in question by recent reports from the AGILE and Fermi groups (Tavani et al. (2010), Science, doi:10.1126/science.1200083; Abdo et al.(2011), 1011-3855, astro-ph.HE) of GeV flaring activity lasting one-two weeks on several occasions. The Whipple observations were taken nightly during the dark moon periods from October through March since 1986. The search for flares of one-two week duration in this rich data archive will be reported.

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