Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306l..71m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 306, July 15, 1986, p. L71-L75.
Astronomy and Astrophysics
Astronomy
30
Bl Lacertae Objects, Spaceborne Astronomy, X Ray Sources, Energy Spectra, Exosat Satellite, Light Curve, Satellite-Borne Instruments, Stellar Luminosity
Scientific paper
Observations of the bright BL Lac object PKS 2155 - 304 obtained at 1-6 keV using the ME argon counters and channel-multiplier array at the focus of the Exosat LE telescope, in conjunction with the 0.05-2-keV-bandpass 3000-A Lexan filter, during a total of 30 h in October-November 1983 and November 1984 are reported. The data are presented in tables and graphs and characterized. Findings discussed include an overall variation of a factor of 10, one factor-of-four increase over 4 h, and maximum luminosity variation dL/dt = 2 x 10 to the 42nd erg/s sq for H = 100 km/s Mpc (corresponding to a lower limit of mass of 10 to the 8th solar mass and a gravitational radius of 3 x 10 to the 13th cm). The implications of these results for theoretical models of the X-ray emission source are considered.
Chiappetti Lucio
Maccagni Dario
Maraschi Laura
Molteni Diego
Morini Marco
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