Simultaneous X-ray, ultraviolet, and optical observations of the BL Lacertae object PKS 2155-304

Details Simultaneous X-ray, ultraviolet, and optical observations of the BL Lacertae object PKS 2155-304 Simultaneous X-ray, ultraviolet, and optical observations of the BL Lacertae object PKS 2155-304

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..733t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 733-747. Research supported by CNR.

Astronomy and Astrophysics

Astrophysics

57

Bl Lacertae Objects, Light Curve, Ultraviolet Spectra, X Ray Sources, Exosat Satellite, Iue, Spectrum Analysis, Synchrotron Radiation, Temporal Resolution

Scientific paper

A series of observations at optical, UV, and X-ray frequencies of PKS 2155-304, one of the brightest BL Lac objects is reported. Spectral fits given for various epochs show that the medium energy data are well fitted by single power laws plus absorption, with energy index between 1.5 and 2. Marginal evidence for an absorption edge at about 7 keV is found, as is evidence for some spectral depression at about 1 keV. This may be modeled with an edge at 660 + or - 26 eV with optical depth tau = 1.8 + or - 0.2. Energy distributions on several occasions are reconstructed, and the optical, UV, and X-ray intensities are found to be correlated in all cases but one. The variability amplitudes decrease and the time scales increase with decreasing frequency. These results indicate a synchrotron origin for the X-rays and distinct but connected emission regions for the X-ray, UV, and optical bands.

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