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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2017

ALMA hints at the existence of an unseen reservoir of diffuse molecular gas in the Galactic bulge

Résumé

Aims. We aim to understand the unexpected presence of mm-wave molecular absorption at −200 km s-1 1.5 kpc, conventional measures such as the standard CO-H2 conversion factor and locally observed N(HCO+)/N(H2) ratio separately imply that H I and H2 contribute about equally to N(H), and the gas-derived N(H) values are in broad agreement with those derived from E(J−K). Within the Galactic bulge at Rgal< 1.5 kpc, H I contributes less than 10% of the material inferred from E(J−K), so that the molecular absorption detected here is needed to understand the extinction.
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Dates et versions

hal-02231251 , version 1 (16-01-2021)

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M. Gerin, H. Liszt. ALMA hints at the existence of an unseen reservoir of diffuse molecular gas in the Galactic bulge. Astronomy and Astrophysics - A&A, 2017, 600, pp.A48. ⟨10.1051/0004-6361/201730400⟩. ⟨hal-02231251⟩
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