Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372...49s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 1, 1991, p. 49-53.
Astronomy and Astrophysics
Astronomy
5
Astronomical Spectroscopy, Seyfert Galaxies, Variability, X Ray Astronomy, Exosat Satellite, Spectrum Analysis, X Ray Spectra
Scientific paper
Broad-band (0.1-10 keV) X-ray observations of a bright Seyfert I galaxy, PG 2130 + 099 are presented using the low-energy (LE) and the medium-energy (ME) detectors of the Exosat Observatory. The observations were carried out on two occasions separated by a year, and the X-ray flux was found to have increased by about 35 percent in the 1.5-6 keV band and by a factor of about two in the low energies. A spectral fit to the combined LE and ME data and shows that a two-component spectral model is required to explain the data on both the occasions. The two-component model consists of a hard power-law component and a steep power law or a blackbody emission in the low energy. The intensity of the low component and the spectral index of the hard component were found to be significantly different on the two occasions. The photon spectral index of the hard component was about 1.6 in 1984 and increased to 2.0 in 1985 when the source was brighter.
Rao Ravi A.
Singh Kamal P.
Vahia Mayank N.
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