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Title: | Kinematics of diffuse interstellar clouds: recent GMRT results |
Authors: | Dwarakanath, K.S. |
Keywords: | ISM: clouds kinematics and dynamics Radio lines ISM |
Issue Date: | Sep-2004 |
Publisher: | The Astronomical Society of India |
Citation: | Bulletin of the Astronomical Society of India, 2004, Vol.32, p215-221 |
Abstract: | A high latitude HI 21 cm-line absorption survey towards extragalactic sources was recently completed using the Giant Meterwave Radio Telescope (GMRT). A total of 104 sources with |b|>15o and with a 21 cm ¤ux density greater than 1 Jy were observed for ~120 hours. With an optical depth detection limit of ~ 0.01 this is the most sensitive high-latitude survey as yet. Most of the detected HI 21 cm-line absorption features belong to a population with a velocity dispersion of ~7.6 km s-1. These are the standard HI clouds and have been well-studied for decades. However, we also detect a second population of absorbing clouds with a velocity dispersion of ~ 21 km s-1. About 20% of the total population of absorbing clouds belong to this population. This new population of fast clouds can be identified with a similar velocity dispersion Ca II absorbing clouds and with the Halo clouds recently detected in HI emission from Green Bank. |
URI: | http://hdl.handle.net/2289/1354 |
ISSN: | 0304-9523 |
Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?2004BASI...32..215D |
Copyright: | (2004) by the Astronomical Society of India. |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2004 BASI V32 p215.pdf | 7p. | 133.9 kB | Adobe PDF | View/Open |
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