An intense soft high-latitude X-ray source H2156-304 - A new BL Lacertae object

Details An intense soft high-latitude X-ray source H2156-304 - A new BL Lacertae object An intense soft high-latitude X-ray source H2156-304 - A new BL Lacertae object

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231l..25a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 231, July 1, 1979, p. L25-L29.

Astronomy and Astrophysics

Astronomy

26

Bl Lacertae Objects, Heao, Radiation Measurement, X Ray Astronomy, Energy Spectra, Power Spectra, Proportional Counters, Satellite-Borne Instruments

Scientific paper

The discovery of an intense high-latitude soft X-ray source (designated H2156-304) detected with the low-energy detectors of the HEAO A-2 experiment is reported. The error box of the source includes a 14th mag starlike object that may be coincident with the radio source PKS 2155-304 and has been suggested as a BL Lac candidate. Intensity variations of H2156-304 on time scales of about 1 sec to 1 day are discussed, along with a probable flare from the source. The derived energy spectrum of the source is shown to be well fitted by either a two-temperature thermal model with temperatures of 16 million and 1.6 million K or a single power-law model with a spectral index of 2.4 + or - 0.3. Hydrogen column densities of approximately 2.5 x 10 to the 20th and 2.0 x 10 to the 20th H atoms/sq cm are obtained for the two-temperature and power-law models, respectively. The emission mechanism of H2156-304 is considered, and the characteristics of this source are compared with those of three known soft X-ray-emitting BL Lac objects.

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