A change in the X-ray spectrum of Markarian 421

Details A change in the X-ray spectrum of Markarian 421 A change in the X-ray spectrum of Markarian 421

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232l..17m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 232, Aug. 15, 1979, p. L17-L19.

Astronomy and Astrophysics

Astronomy

37

Bl Lacertae Objects, Spaceborne Astronomy, X Ray Sources, X Ray Spectra, Astronomical Models, Heao 1, Iue, Sas-3, Satellite Observation, Ultraviolet Spectra

Scientific paper

HEAO 1 A-2 experiment observations of the BL Lacertae object Mrk 421 in May 1978 show a marked spectral change from the OSO 8 observations of May 1977. The source was not detected above 10 keV in May 1978. The 2-10 keV spectrum could be well fitted by a power law with an energy slope of 2.2 to 4.2; thermal bremsstrahlung models with T less than 20 million are also acceptable. There was no indication of any low-energy turnover, so that the inferred column density is less than 7 x 10 to the 21st H atoms per sq cm. The total flux is consistent with an extrapolation of the UV data from IUE, but the slope is not consistent with the UV slope. Possible models for the origin of the spectral transition are discussed.

Affiliated with

Also associated with

No associations

Rating

A change in the X-ray spectrum of Markarian 421 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A change in the X-ray spectrum of Markarian 421, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A change in the X-ray spectrum of Markarian 421 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1483784