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An accurate Galactic NH map of the north ecliptic pole
Elvis, Martin; Lockman, Felix J.; Fassnacht, C.
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US)
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 95, no. 2, p. 413-417 (ApJS Homepage)
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NASA/STI Keywords:
Astronomical Maps, Galactic Structure, H I Regions, Interstellar Matter, Line Spectra, Molecular Clouds, Radio Astronomy, Radio Spectra, Abundance, Astronomical Spectroscopy, Ecliptic, Hydrogen
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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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Database: Astronomy
arXiv e-prints