Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..601m&link_type=abstract
(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews
Astronomy and Astrophysics
Astronomy
4
Bl Lacertae Objects, Ultraviolet Spectra, Variability, X Ray Sources, Argon, Energy Spectra, Exosat Satellite, Observation
Scientific paper
The BL Lac object PKS 2155-304 was observed on October 31 and November 29, 1983 using the low-energy and medium energy X-ray detectors on board the EXOSAT spacecraft. Simultaneous observations were carried out in the ultraviolet using the IUE spacecraft, and in the infrared-optical range using the optical telescope at ESO Observatory in La Silla, Chile. X-ray variability was observed on a time scale of hours during the October 31 observation. The X-ray source was a factor of two brighter on November 29, but no spectral modifications were found between the two observing periods. Marginal detection in the medium-energy xenon counters was attributed to a flattening of the energy spectrum in the high-energy band. X-ray observations extending over three decades are compared with the UV and optical observations, and the results are discussed in detail.
Maccagni Dario
Maraschi Laura
Molteni Diego
Morini Marco
Tanei E. G.
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