Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..663o&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.53, No. 4, pp. 663-668
Astronomy and Astrophysics
Astronomy
2
Galaxies: Individual (M 33), Galaxies: Spiral, Supernova Remnants, X-Rays: Galaxies
Scientific paper
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 ~ 1.0 keV, and a power law emission with a photon index of ~ 2.0. The two spectral components cross over at ~ 3.0 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, ~ 1.0 × 1038 erg 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 α-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.
Makishima Kazuo.
Okada Yuu
Takahashi Hiromitsu
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