ASCA Observations of Two Ultra-Luminous Compact X-Ray Sources in the Edge-On Spiral Galaxy NGC 4565
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概要
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arXiv:astro-ph/9905277v1http://arxiv.org/abs/astro-ph/9905277The edge-on spiral galaxy NGC 4565 was observed for similar to 35 ks with ASCA in the 0.5-10 keV energy band. The X-ray emission was dominated by two bright sources, which could be identified with two point-like X-ray sources seen in the ROSAT HRI image. The observed 0.5-10 keV fluxes of these sources, 1.7 x 10(-12) erg s(-1) cm(-2) and 0.7 x 10(-12) erg s(-1) cm(-2), imply bolometric luminosities of 1.2 x 10(40) erg s(-1) and 4.6 x 10(39) erg s(-1), respectively. They exhibit similar spectra, which can be explained by emission from optically thick accretion disks with inner-disk temperature of 1.4-1.6 keV. One of them, coincident in position with the nucleus, shows too low absorption to be the active nucleus seen through the galaxy disk. Their spectra and high luminosities suggest that they are both mass-accreting black-hole binaries. However, the black-hole mass required by the Eddington limit is rather high (greater than or equal to 50M.), and the observed disk temperature is too high to be compatible with the high black-hole mass. Several attempts have been made to solve these problems.
- Astronomical Society of Japanの論文
著者
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TASHIRO Makoto
Department of Physics, Saitama University
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MAKISHIMA Kazuo
Department of Physics, University of Tokyo
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MIZUNO Tsunefumi
Department of Physics, Hiroshima University
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KUBOTA Aya
Department of Electronic Information Systems, Shibaura Institute of Technology
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Makishima Kazuo
Department Of Physics School Of Science The University Of Tokyo
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Tashiro Makoto
Department Of Physics The University Of Tokyo
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OHNISHI Tomohisa
Department of Physics, The University of Tokyo
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Mizuno Tsunefumi
Department Of Physical Science Hiroshima University
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Ohnishi Tomohisa
Department Of Physics The University Of Tokyo
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Mitani Takefumi
Department Of Physical Science Hiroshima University
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Kubota A
Department Of Electronic Information Systems Shibaura Institute Of Technology
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Tashiro Makoto
Department Of Astronomy And Astrophysics Pennsylvania State University
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