Intermediate-velocity Molecular Gas at High Northern Galactic Latitudes

Details Intermediate-velocity Molecular Gas at High Northern Galactic Latitudes Intermediate-velocity Molecular Gas at High Northern Galactic Latitudes

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...722.1685m&link_type=abstract

The Astrophysical Journal, Volume 722, Issue 2, pp. 1685-1690 (2010).

Astronomy and Astrophysics

Astronomy

Ism: Clouds, Ism: Kinematics And Dynamics, Ism: Molecules

Scientific paper

We surveyed the CO(1-0) transition in 16 regions at Galactic latitudes >45° which contain compact dust cores less than half a degree in size with E(B - V) values ~ 0.1 mag. We discovered three new intermediate-velocity molecular clouds and two high-latitude molecular clouds with more typical local standard of rest velocity (~0 km s-1). The three intermediate-velocity molecular clouds (detected in CO emission in 11 lines of sight) nearly double the number of previously known, CO-emitting clouds. In order to detect the CO(1-0) line, N(H2) values of at least 1019 cm-2 are necessary, implying that the molecular/atomic fraction of these objects is significant and is in contrast to the primarily atomic lines of sight with log N(H2) < 17.3 detected in absorption by FUSE. The three molecular clouds are projected on and likely associated with a previously known intermediate-velocity H I feature known as the Intermediate Velocity Spur that may extend to the Galactic halo.

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