Rapid X-Ray Variability in Bl-Lacertae Objects
Abstract
A study of the short timescale X-ray variability of BL Lacertae objects is performed using the EXOSAT archive. Two hundred and one observations of 36 BL Lacertae objects revealed rapid variability in 21 observations of eight objects. Evidence for relativistic bulk motions is found in only one source PKS2155-304; 1E1402.3+0416 is also a candidate, its redshift being unknown. The other variable BL Lac objects exhibited less variations. Pronounced spectral changes were found, with the sources being harder when the intensity is higher.
- Publication:
-
Two Topics in X-Ray Astronomy, Volume 1: X Ray Binaries. Volume 2: AGN and the X Ray Background
- Pub Date:
- November 1989
- Bibcode:
- 1989ESASP.296..831B
- Keywords:
-
- Bl Lacertae Objects;
- Light Curve;
- Variability;
- X Ray Spectra;
- Exosat Satellite;
- Red Shift;
- Satellite Observation;
- Spectrum Analysis;
- Space Radiation