ROSAT PSPC Observations of the Extragalactic HII Region NGC5408

Details ROSAT PSPC Observations of the Extragalactic HII Region NGC5408 ROSAT PSPC Observations of the Extragalactic HII Region NGC5408

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263l..51f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 263, NO.4/AUG15, P. L51, 1993

Astronomy and Astrophysics

Astronomy

18

Scientific paper

We report the first ROSAT PSPC observations of the extragalactic H II region NGC 5408. The source is spatially unresolved and its spectrum is soft. Optically thin plasma models for the spectrum require a low metal abundance and a mean temperature of about 0.52 keV. The 0.2-2 keV luminosity of the source is 2 X 10^40^ erg s^-1^. A localized, violent starburst, in which 1000 supernovae occur within 100000 yr, can account for the observed X-ray properties of NGC 5408. The low metallicity means that the expanding bubble produced by the supernovae becomes radiative much later than under Galactic conditions, so radiating much more of its energy as soft X-rays.

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