Thermal OH (1667/1665 MHz) absorption and nonthermal OH (1720 MHz) emission toward the W28 supernova remnant | Macquarie University ResearchOnline

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Thermal OH (1667/1665 MHz) absorption and nonthermal OH (1720 MHz) emission toward the W28 supernova remnant

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/27268

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Title: Thermal OH (1667/1665 MHz) absorption and nonthermal OH (1720 MHz) emission toward the W28 supernova remnant
Related: Astrophysical journal, Vol. 583, Issue 1, p.267-271
DOI: 10.1086/344836
Publisher: University of Chicago Press
Date: 2003
Author/Creator: Yusef-Zadeh, F
Author/Creator: Wardle, M
Author/Creator: Roberts, D. A
Description: The W28 supernova remnant (SNR) is an excellent prototype for observing shocked gas resulting from the interaction of SNRs and adjacent molecular clouds (MCs). We present two new signatures of shocked molecular gas in this remnant. One is the detection of mainline extended OH (1667 MHz) absorption with broad line widths. The column density of OH estimated from the optical depth profiles is consistent with a theoretical model in which OH is formed behind a C‐type shock front. The second is the detection of extended, weak OH (1720 MHz) line emission with narrow line widths distributed throughout the shocked region of W28. These give observational support to the idea that compact maser sources delineate the brightest component of a much larger region of mainline OH absorption and nonthermal OH (1720 MHz) emission tracing the global structure of shocked molecular gas. Mainline OH (1665/1667 MHz) absorption and extended OH (1720 MHz) emission line studies can serve as powerful tools to detect SNR‐MC interaction even when bright OH (1720 MHz) masers are absent.
Description: 5 page(s)
Subject Keyword: ISM : clouds
Subject Keyword: ISM : general
Subject Keyword: shock waves
Subject Keyword: supernova remnants
Subject Keyword: X-rays : ISM
Resource Type: journal article
Organisation: Macquarie University. Dept. of Physics

Identifier: http://hdl.handle.net/1959.14/27268
Identifier: ISSN:1538-4357
Identifier: mq-rm-2003018523
Language: eng
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