ASCA and ROSAT observations of the Seyfert 1 galaxy RX J0437.4−4711 |
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| Authors: | Wang,Otani,Cappi,Leighly,Brinkmann,& Matsuoka |
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| Affiliation: | The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-01, Japan,;Center for Astrophysics, University of Science and Technology of China, Hefei, Anhui, 230026, China,;Istituto per le Tecnologie e Studio Radiazioni Extraterrestri (IteSRE), CNR, Via Gobetti 101, I-40129, Bologna, Italy,;Columbia Astrophysics Laboratory, Columbia University, 538 West 120th Street, New York, NY 10027, USA,;Max-Planck-Institut für extraterrestrische Physik, D-85748, Garching, Germany |
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| Abstract: | 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 τ = 0.26 ± 0.13 at the rest-frame energy of E = 0.83 ± 0.05 keV and an Fe Kα line with EW = 430 ± 220 eV at an energy E = 6.47 ± 0.15 keV are also detected. The X-ray flux showed a 47 per cent increase between two ASCA observations 4 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. |
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| Keywords: | galaxies: individual: RX J0437.4−4711 galaxies: Seyfert X-rays: galaxies |
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