Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004assl..312..183r&link_type=abstract
High Velocity Clouds. Edited by Hugo van Woerden, Kapteyn Institute, Groningen, The Netherlands; Bart P. Wakker, University of W
Astronomy and Astrophysics
Astrophysics
Scientific paper
In this chapter, we discuss the dust content and the abundance and distribution of molecular gas in the Galactic Halo. During the last two decades, significant progress has been made in observing dust and molecules in halo clouds using various instruments and observing techniques. Infrared dust emission and ultraviolet absorption by molecular hydrogen, H2, now have been detected in a number of neutral halo clouds, but only in regions where the overall metal abundance is close to that of the Milky Way or the Magellanic Clouds. The column densities of the molecular gas in the halo generally are very low, but the presence of H2 both indicates the presence of dust and implies the existence of small-scale structure at sub-parsec/AU scales. Moreover, the H2 measurements provide important density and temperature estimates for the absorbing structures and thus reveal important new aspects of the physical conditions in the Galactic Halo clouds.
de Boer Klaas. S.
Richter Philipp
No associations
LandOfFree
The Coldest Phase in Halo High-Velocity Gas: Dust and Molecules does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Coldest Phase in Halo High-Velocity Gas: Dust and Molecules, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Coldest Phase in Halo High-Velocity Gas: Dust and Molecules will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1839771