Hour-Scale Multiwavelength Variability in Markarian 421

Details Hour-Scale Multiwavelength Variability in Markarian 421 Hour-Scale Multiwavelength Variability in Markarian 421

1999-06-11

arxiv.org/abs/astro-ph/9906209v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to be published in the proceedings of the 26th ICRC (Salt Lake City, 1999)

Scientific paper

Markarian 421 was observed for about four days with BeppoSAX and the Whipple Observatory gamma-ray telescope in April 1998. A pronounced, well-defined, flare with hour-scale variability was observed simultaneously in X-rays and very high energy gamma-rays. These data provide the first evidence that the X-ray and TeV intensities are well correlated on time-scales of hours. While the rise of the flare occurred on a similar time-scale in the two wavebands, the decay of the flare was much more rapid in gamma rays, providing the first clear indication that the X-ray and gamma-ray emission may not be completely correlated in Markarian 421.

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