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Extra-planar H Ι in the inner Milky Way

Citation

Lockman, FJ and Pidopryhora, Y, Extra-planar H Ι in the inner Milky Way, Proceedings of the Astronomical Society of the Pacific Conference 2004, 7-11 June 2004, Dwingeloo, The Netherlands, pp. 59-66. (2005) [Non Refereed Conference Paper]


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Abstract

The extra-planar HI in the inner parts of the Milky Way has been discovered to contain numerous cloud-like structures when observed in the 21 cm line with the Green Bank Telescope. These halo clouds have motions consistent with Galactic rotation and do not seem to be related to the classic high-velocity clouds. They are found to distances >1 kpc from the plane and can contain hundreds of M of HI. Spectra of many of the halo clouds show evidence of coexisting cool and warm HI phases. A preliminary high-resolution study of one of the clouds suggests that it consists of a diŽuse envelope and a few dense cores, with a peak NH I reaching 4 X 1020 cm-2. The clouds are often organized into larger structures, one example of which was discovered near ζ = 35° rising higher than 2 kpc above the Galactic plane. New observations should answer some fundamental questions about the nature of these clouds.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:Milky Way, neutral hydrogen, HI, interstellar matter, extra-planar gas, halo clouds
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Pidopryhora, Y (Dr Yurii Pidopryhora)
ID Code:95818
Year Published:2005
Deposited By:Mathematics and Physics
Deposited On:2014-10-08
Last Modified:2014-10-09
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