Hostname: page-component-848d4c4894-r5zm4 Total loading time: 0 Render date: 2024-07-06T15:57:48.419Z Has data issue: false hasContentIssue false
  • English
  • Français

Neutral hydrogen sub-structure in the Galactic Halo outside the solar circle

Published online by Cambridge University Press:  17 September 2012

L. Dedes  and
P.M.W. Kalberla
L. Dedes
Affiliation:
Auf dem Hügel 71, 53121 Bonn, Germany
P.M.W. Kalberla
Affiliation:
Auf dem Hügel 71, 53121 Bonn, Germany
Get access

Abstract

21-cm studies of the Galactic extra-planar gas layer can help us understand the origin of the gaseous Galactic halo and its interaction with the Milky Way disk. The 100-m Effelsberg radio telescope was utilized to detect and analyze a population of Hi halo clouds belonging to this layer, at Galactocentric radii R > 8.5kpc, following Galactic rotation. This sample of clouds has similar properties to the population detected by Lockman with the GBT at R < 8.5kpc. High resolution follow-up observations resolve them into a number of small, dense, cold arc-minute sized Hi cores. Their study provides evidence for a thermal equilibrium with the extended warmer envelopes. Single dish observations with the 300-m Arecibo telescope disclosed a sample of Hi clouds with similar properties. A power spectrum analysis of the Arecibo maps probes the characteristics of turbulence as a dominant physical process in the halo region.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 209 - 212
Copyright
© EAS, EDP Sciences, 2012

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Dessauges-Zavadsky, M., Combes, F., & Pfenniger, D., 2007, A&A, 473, 863
Lockman, F.J., 2002, ApJ, 580, L47CrossRef
Kalberla, P.M.W., & Kerp, J., 1998, A&A, 339, 745
Kalberla, P.M.W., Burton, W.B., Hartmann, D., et al., 2005, A&A, 440, 775
Kalberla, P.M.W., Dedes, L., et al., 2005, Extra-Planar Gas, 331, 81
Kalberla, P.M.W., Dedes, L., Kerp, J., & Haud, U., 2007, A&A, 469, 511
Kalberla, P.M.W., & Dedes, L., 2008, A&A, 487, 951
Richter, P., 2005, Extra-Planar Gas, 331, 41
Wolfire, M.G., McKee, C.F., Hollenbach, D., & Tielens, A.G.G.M., 1995, ApJ, 453, 673CrossRef
Wolfire, M.G., McKee, C.F., Hollenbach, D., & Tielens, A.G.G.M., 2003, ApJ, 587, 278CrossRef