Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.293..397w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 293, p. 397
Astronomy and Astrophysics
Astronomy
4
Rosat Mission, Seyfert Galaxies, Galactic Radiation, X Ray Sources, X Ray Spectra, Spectrum Analysis, X Ray Astronomy, Active Galactic Nuclei
Scientific paper
Results of ASCA and ROSAT observations of the Seyfert 1 galaxy RX J0437.4-4711 are presented. The X-ray continuum spectrum can be described by the sum of a power law with photon index 2.15 +/- 0.04 and a soft emission component characterized by a blackbody with temperature 29 +/- 2 eV. The total luminosity of the soft component is larger than that of the power-law component if the power law is cut off around a few hundred keV. A weak absorption edge with r = 0.26 +/- 0.13 at the rest-frame energy of 0.83 +/- 0.05 keV and an Fe K-alpha line with EW = 430 +/- 220 eV at an energy of 6.47 +/- 0.15 keV are also detected. The X-ray flux showed a 47 percent increase between two ASCA observations four months apart, but no spectral variability was seen. We argue that reprocessing of the hard X-ray emission cannot produce all the soft X-ray emission, since the total luminosity of the soft component is larger than that of the integrated power-law component. Similarities with some stellar black hole candidates are briefly discussed.
Brinkmann Wolfgang
Cappi Massimo
Leighly Karen M.
Matsuoka Masaru
Otani Chico
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