Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296.1053s&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 1053-1058 (SEE N90-2
Astronomy and Astrophysics
Astronomy
5
Exosat Satellite, Ginga Satellite, Japanese Space Program, Seyfert Galaxies, Variability, X Ray Spectra, Light Curve, Satellite Observation, X Ray Astronomy
Scientific paper
The X-ray light curves and spectra of Mrk 509 are presented. Data from the EXOSAT archives and two observations with the Ginga satellite are used. Both the EXOSAT ME data and the Ginga data show continuously varying X-ray intensity. The Ginga observations show an increase in the first observation and a decrease in the second observation on a timescale of hours. The maximum variation observed is approximately equal to 30 percent. The X-ray source was brighter in 1988 than in 1983, with the maximum on October 8, 1988. The EXOSAT LE + ME X-ray spectra are best fit by a power law with gamma approximately equal to 1.9 and a variable component below 1 keV. The spectra observed with the Ginga are best fit by gamma approximately equal to 1.7 for E equal or greater than 3 keV and a steeper component below 3 keV. A line feature near 6 keV is observed with Ginga.
Awaki Hisamitsu
Schnopper Herbert W.
Singh Kamal P.
Tawara Yuzura
Westergaard Niels Joergen
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