X-ray emitting BL Lacertae objects located by the scanning modulation collimator experiment on HEAO 1

Details X-ray emitting BL Lacertae objects located by the scanning modulation collimator experiment on HEAO 1 X-ray emitting BL Lacertae objects located by the scanning modulation collimator experiment on HEAO 1

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229l..53s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 229, Apr. 15, 1979, p. L53-L57.

Astronomy and Astrophysics

Astronomy

79

Bl Lacertae Objects, Heao 1, Spaceborne Astronomy, X Ray Sources, Astronomical Catalogs, Electromagnetic Spectra, Light Curve, X Ray Spectra

Scientific paper

It is established that BL Lacertae objects constitute a class of X-ray emitter by precisely locating X-ray sources identified with Mrk 421, PKS 0548-322, PKS 2155-304, and 2A 1219+305. Irregular variations of the order of 1 mag, characteristic of BL Lacertae objects, are reported for the last two objects. The measurement of an extremely steep X-ray spectrum from Mrk 421, in contrast to previous flat X-ray spectra above 3 keV, suggests that different structural states of an accretion disk are being observed.

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