Variable X-ray spectra of BL Lac objects: HEAO-1 observations of PKS 0548-322 and 2A 1219+305

Details Variable X-ray spectra of BL Lac objects: HEAO-1 observations of PKS 0548-322 and 2A 1219+305 Variable X-ray spectra of BL Lac objects: HEAO-1 observations of PKS 0548-322 and 2A 1219+305

Publishing date

May 1980

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8031283w&link_type=abstract

Journals

Unknown

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 3

Bl Lacertae Objects, Galactic Nuclei, X Ray Astronomy, X Ray Spectra, Active Galactic Nuclei, Bremsstrahlung, Heao 1, Periodic Variations, Polarization (Waves), Radiant Flux Density, Synchrotron Radiation

Type

Scientific paper

Abstract

X-ray spectra for the BL Lac objects PKS 0548-322 and 2A 1219+305 measured with the HEAO-1 A2 detectors during pointing maneuvers on September 30, 1978 and May 31, 1978 respectively are presented. Both fit single power law components with low energy absorption. For 2A 1219+305, a thermal bremsstrahlung form gives an unacceptable fit. From a comparison with other statistically poorer observations taken at 6 month intervals while the satellite was in its normal scanning mode, it is found that the sources exhibit spectral variability. A summary of measurements of the 5 BL Lac objects detected with the A2 experiment is presented and it is concluded that X-ray spectral changes in this class of source are common. Their general X-ray spectral characteristics distinguish BL Lac objects from other classes of X-ray emitting active galactic nuclei. Analysis of their total spectra indicates that most of the energy is emitted in the 5 to 100 eV band.

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