The Molecular Fraction and Abundances of Gas in the Galaxy

Details The Molecular Fraction and Abundances of Gas in the Galaxy The Molecular Fraction and Abundances of Gas in the Galaxy

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..715a&link_type=abstract

Chandra Proposal ID #02910627

Physics

Chandra Proposal Id #02910627

Scientific paper

Molecular absorption line studies and X-ray absorption observations toward AGN indicate that molecular gas is as abundant as neutral atomic gas in the Solar vicinity. At larger Galactic radii, H2 exceeds HI in some locations, and if this is generally true, it implies a dramatic revision in the picture of neutral gas in disk galaxies. To determine if H2 dominates the ISM at large radii, we propose to measure the X-ray absorption column toward AGNs projected behind the outer part of the Galactic disk, which is expected to be about 1E22/cm2, to an accuracy of 3-7%. Subtracting off the 21 cm column yields an H2 measurement of unprecedented accuracy. These high columns will also allow us to measure the abundances of O, Fe, and Ne to high accuracy, without the usual systematic uncertainties.

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