The X-ray spectral variability of the BL Lacertae type object PKS 2155-304

Details The X-ray spectral variability of the BL Lacertae type object PKS 2155-304 The X-ray spectral variability of the BL Lacertae type object PKS 2155-304

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..112s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 112-123.

Astronomy and Astrophysics

Astronomy

80

Bl Lacertae Objects, X Ray Spectra, Astronomical Spectroscopy, Ginga Satellite, Light Curve, Spaceborne Astronomy, Spectrum Analysis, Synchrotron Radiation

Scientific paper

We present a detailed study of the hard X-ray properties of the BL Lacertae object PKS 2155-304 based on measurements made in 1988 and 1989 with the Large Area Counter (LAC) on board the Ginga satellite. The source exhibited a high degree of variability with a dynamic range of a factor 7 in the 2-6 keV band. The fastest amplitude variation was a factor 2 decline in the intensity in this band within 4 hours. The spectrum is characterized by a break which occurs at about 4 keV. Spectral fits to the data integrated in 6400 s time bins reveal that, in common with previous observations of BL Lacertae objects, the spectral slope is generally anticorrelated with intensity in the sense that the spectrum hardens as the intensity increases. However, the tracks of sequential points in the index-intensity plane are occasionally seen to differ during the rise and decay stages of individual flares. Furthermore, during one, or possibly two, flaring episodes the spectral index is observed to correlate with intensity variations.

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