Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..591m&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.56, No.4, pp. 591-595
Astronomy and Astrophysics
Astronomy
3
Galaxies: Individual (Ngc 4449), Galaxies: Irregular, X-Ray: Galaxies
Scientific paper
Using archival Chandra ACIS-S data, 0.5 8.0 keV X-ray spectra of two luminous X-ray sources in the nearby dwarf irregular galaxy NGC 4449 were studied. One, with an extremely high luminosity of 1.3 × 1039 erg s-1 in the 0.5 8.0 keV band, shows a spectrum that is well described with a power-law model of photon index ˜ 2. Its properties are consistent with those of ultraluminous compact X-ray sources observed in nearby galaxies. The spectrum of the other, with a luminosity of 2.7 × 1038 erg s-1 in the same band, is successfully represented with a so-called multi-color disk blackbody emission model with an inner-most disk temperature of ˜ 0.59 keV. Its spectral parameters are typical of ordinary black hole binaries observed in our Galaxy and the Large Magellanic Cloud. These young population objects, together with a bright supernova remnant and diffuse hot gas already reported, suggest that the X-ray emission from irregular galaxies is generally enhanced by their recent star-forming activities.
Kokubun Motohide
Makishima Kazuo.
Miyawaki Ryohei
Sugiho Masahiko
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