Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..323j&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)323-(12)326
Astronomy and Astrophysics
Astronomy
1
Astronomical Models, Flux Density, Hydrogen, Luminosity, Starburst Galaxies, X Ray Astronomy, X Ray Imagery, X Ray Spectra, Heao 2, Proportional Counters, Rosat Mission, Statistical Correlation
Scientific paper
We present results from ROSAT observations of NGC 1808 and NGC 2903. Exposures of 10 ksec each with the Position-Sensitive Proportional Counter (PSPC) detector show X-ray sources at the central positions of both galaxies which are classified as nuclear starburst galaxies. Both targets, NGC 1808 and NGC 2903 appear slightly extended in X-ray maps in the energy band 0.1-2.4 keV. The X-ray spectrum of NGC 1808 shows almost complete absorption below 0.5 keV, indicating an extremely high hydrogen column density towards that source (NH approx. = 8 x 1021/sq cm resulting from model fits on the PSPC spectrum). In the case of NGC 2903, the number of counts in the ROSAT band is significantly lower than expected from a previous EINSTEIN (HEAO 2) investigation of the source.
Hensler Gerhard
Junkes Norbert
Pietsch Wolfgang
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