The X-ray spectrum and variability of Markarian 421

Details The X-ray spectrum and variability of Markarian 421 The X-ray spectrum and variability of Markarian 421

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219...39w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 1, 1986, p. 39-45.

Astronomy and Astrophysics

Astronomy

7

Bl Lacertae Objects, Variability, X Ray Sources, Exosat Satellite, Light Curve, X Ray Spectra

Scientific paper

The X-ray bright BL Lac object Markarian 421 (Mrk 421) was observed by Exosat four times over a period of 6 days in February 1984. The source exhibited a very soft power-law X-ray spectrum (photon spectral index is about 2.8) with an extremely low intrinsic column density (less than or equal to 10 to the 20th/sq cm). Significant X-ray variability (about 40 percent) was apparent on a time scale of the order of a day with an indication of a softening of the X-ray spectrum as the source flux decreased. The relatively rapid X-ray variability and overall (radio to X-ray) spectrum of Mrk 421 are discussed in terms of the synchrotron self-Compton model. A high degree of relativistic beam is not a requirement for this source.

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