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Date and Time of the Query: 2019-05-23 T04:31:20 PDT
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For refcode 2004ApJ...606..213T:
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Copyright by American Astronomical Society. Reproduced by permission
2004ApJ...606..213T Chandra Observations of the Three Most Metal Deficient Blue Compact Dwarf Galaxies Known in the Local Universe, SBS 0335-052, SBS 0335-052W, and I Zw 18 Trinh X. Thuan, Franz E. Bauer, Polichronis Papaderos, and Yuri I. Izotov Abstract. We present an X-ray study of the three most metal deficient blue compact dwarf (BCD) galaxies known in the local universe, based on deep Chandra observations of SBS 0335-052 (0.025 Z_sun_), SBS 0335-052W (0.02 Z_sun_), and I Zw 18 (0.02 Z_sun_). All three are detected, with more than 90% of their X-ray emission arising from pointlike sources. The 0.5 - 10.0 keV luminosities of these point sources are in the range (1.3 - 8.5)x10^39^ ergs s^-1^. We interpret them to be single or a collection of high-mass X-ray binaries, the luminosities of which may have been enhanced by the low metallicity of the gas. There are hints of faint extended diffuse X-ray emission in both SBS 0335-052 and I Zw 18, probably associated with the superbubbles visible in both BCDs. The spectrum of I Zw 18 shows an O VIII hydrogen-like emission line. The best spectral fit gives an O overabundance of the gas in the X-ray point source by a factor of ~7 with respect to the Sun, or a factor of ~350 with respect to the O abundance determined for the H II region. Keywords: Galaxies: Individual: I Zw 18, Galaxies: Individual: SBS 0335-052, Galaxies: Individual: SBS 0335-052W, Galaxies: Starburst, X-Rays: Galaxies
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