A ROSAT X-ray image of the 30 Doradus giant HII region.

Details A ROSAT X-ray image of the 30 Doradus giant HII region. A ROSAT X-ray image of the 30 Doradus giant HII region.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..879n&link_type=abstract

Astronomy and Astrophysics, v.302, p.879

Astronomy and Astrophysics

Astrophysics

13

Ism: 30 Doradus, Ism: Hii Regions, Ism: Bubbles, X-Rays: Ism, Magellanic Clouds

Scientific paper

Two ROSAT PSPC observations have been used for studying the morphology and the spectrum of 30 Dor. Twenty-seven sources have been detected in the Nebula or in the immediate surroundings. Their spectral properties are assessed on the basis of ROSAT hardness ratios and show a trend of decreasing absorption toward the border of the Nebula. The morphology of the diffuse emission has been studied in three energy bands: 0.10-0.40, 0.41-1.00, 1.01-2.40keV. New features are found which underline the complex interrelation between Nebula and some nearby regions of X-ray emission. The PSPC data show a clear association of discrete sources with smaller cavities and with the edges of larger shells, as delineated by the Halpha_ brightness distribution. A spectral analysis indicates the 30 Dor Nebula to be a high absorption, low temperature emitter. The spectrum of the supernova remnant in 30 Dor, N 157 B (30 Dor B) is also presented. The contribution of the young massive stars to the X-ray emission of the Nebula has been estimated to be less than 1-2% of the total emission. The possible role of other contributors to the total emission is also discussed.

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