ROSAT and optical observations of a sample of H II galaxies.

Details ROSAT and optical observations of a sample of H II galaxies. ROSAT and optical observations of a sample of H II galaxies.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..375f&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 375 - 376

Astronomy and Astrophysics

Astrophysics

3

H Ii Galaxies: Helium Lines, H Ii Galaxies: X-Ray Sources

Scientific paper

A non-negligible number of H II galaxies display high-ionization spectra with the presence of the narrow He II λ4686 Å recombination line which cannot be explained by photoionization by normal O stars. One hypothesis is to say that this line is due to photoionization by the extreme luminous X-ray sources present in these galaxies. To test this, the authors compiled a sample of X-ray emitting H II galaxies from the literature and cross-correlated it with the ROSAT archive and their own PSPC and HRI observations. Most of the H II galaxies studied exhibit luminous X-ray sources but their positions are not systematically spatially correlated with the sites of high-ionization and ongoing star formation.

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