NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon

Record Details

Record 49 of 1837
Planar H2O masers in star-forming regions
Author and Affiliation:
Elitzur, Moshe(Kentucky, University, Lexington, NASA, Ames Research Center)
Hollenbach, David J.(NASA Ames Research Center, Moffett Field, CA, United States)
Mckee, Christopher F.(California, University, Berkeley, United States)
Abstract: The paper examines the planar geometry of shocked material, which is the key property in enabling the high brightness temperatures of H2O masers in star-forming regions. The brightness temperature, beaming angle, and the maser spot size are determined for thin, saturated planar masers under the assumption that the velocity change across the maser due to ordered motions is small compared with the thermal or microturbulent line width. For a given set of physical parameters, the brightness temperature is essentially fully determined by the length of the velocity-coherent region in the shocked plane along the line of sight. Effective aspect ratios (about 5-50) are found that are in agreement with values previously inferred from observed brightness temperatures.
Publication Date: Jul 20, 1992
Document ID:
(Acquired Nov 22, 1995)
Accession Number: 92A48123
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 394; 1, Ju
Publisher Information: United States
Contract/Grant/Task Num: NSF AST-90-16810; NSF AST-89-18573; RTOP 399-20-01-35
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
NASA; Washington, DC, United States
Description: 7p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 394, no. 1, July 20, 1992, p. 221-227.
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 19, 2011
Contact Us