Simultaneous X-Ray and TEV Observations of a Rapid Flare from Markarian 421

Details Simultaneous X-Ray and TEV Observations of a Rapid Flare from Markarian 421 Simultaneous X-Ray and TEV Observations of a Rapid Flare from Markarian 421

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...526l..81m&link_type=abstract

The Astrophysical Journal, Volume 526, Issue 2, pp. L81-L84.

Astronomy and Astrophysics

Astronomy

100

Galaxies: Bl Lacertae Objects: Individual: Name: Markarian 421, Galaxies: Active, Galaxies: Jets, Gamma Rays: Observations, X-Rays: Galaxies

Scientific paper

Mrk 421 was observed for about 2 days with BeppoSAX in 1998 April as part of a worldwide multiwavelength campaign. A large, well-defined flare was observed in X-rays. The same flare was observed simultaneously at TeV energies by the Whipple Observatory gamma-ray telescope. These data provide (1) the first evidence that the X-ray and TeV intensities are well correlated on timescales of hours and (2) the first exactly simultaneous X-ray and TeV spectra. The results imply that the X-ray and TeV photons derive from the same region and from the same population of relativistic electrons. The physical parameters deduced from a homogeneous synchrotron self-Compton model for the spectral energy distribution yield electron cooling times close to the observed variability timescales.

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