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- W1970176688 abstract "Based on ASCA observations of the Local-Group spiral galaxy M 33, a report is made on the X-ray properties of luminous X-ray source called X-4, which is located in a giant H ii region in M 33. The 0.8-8.0keV spectrum of X-4 is described by a two-component model, consisting of a thin thermal plasma emission with a temperature of |$ sim 1.0 ,mathrm{keV}$|, and a power law emission with a photon index of |$ sim 2.0$|. The two spectral components cross over at |$ sim 3.0 ,mathrm{keV}$|. These spectral properties are similar to those of a young supernova remnant (SNR), except that the 0.8-8.0keV luminosity of M 33 X-4, |$ sim 1.0 times 10^{38} ,mathrm{erg} ,mathrm{s}^{-1}$|, is considerably higher than those of the SNRs in the Milky Way. There is also evidence of excess absorption, or an over-abundance of |$ alpha$|-elements relative to iron. If this source is an SNR, the hard component is thought to be synchrotron radiation from high-energy particles, produced either by shock acceleration, like in SN 1006, or by a central neutron star, like in the Crab Nebula." @default.
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- W1970176688 date "2001-08-25" @default.
- W1970176688 modified "2023-09-24" @default.
- W1970176688 title "An X-Ray Emitting Supernova Remnant Candidate, M 33 X-4" @default.
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- W1970176688 doi "https://doi.org/10.1093/pasj/53.4.663" @default.
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