An accurate Galactic NH map of the north ecliptic pole

Details An accurate Galactic NH map of the north ecliptic pole An accurate Galactic NH map of the north ecliptic pole

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...95..413e&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 95, no. 2, p. 413-417

Astronomy and Astrophysics

Astronomy

34

Astronomical Maps, Galactic Structure, H I Regions, Interstellar Matter, Line Spectra, Molecular Clouds, Radio Astronomy, Radio Spectra, Abundance, Astronomical Spectroscopy, Ecliptic, Hydrogen

Scientific paper

The Galactic HI column density was measured at 21 min angular resolution over an 8 deg x 9 deg region centered on the north ecliptic pole. Over the region NH varies smoothly between 3 x 1020 atoms/sq cm and 8 x 1020 atoms/sq cm; some structure is seen over most of the map on an 0.5 - 1 deg scale. There are other possible sources of interstellar opacity in this direction which may add an equivalent 1020/sq cm of HI. We evaluate the effect of uncertainties in the HI column density on implied X-ray fluxes of extragalactic objects.

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