HI absorption in the gigamaser galaxy TXS 2226-184 and the relation between HI absorption and water emission

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Title: HI absorption in the gigamaser galaxy TXS 2226-184 and the relation between HI absorption and water emission
Author: Taylor, Gregory; Peck, Alison; Henkel, Christian; Falcke, Heino; Mundell, Carole; O'Dea, Christopher; Baum, Stefi; Gallimore, Jack
Abstract: We report on the discovery of H i in absorption toward the gigamaser galaxy TXS 2226-184 using the Very Large Array. The absorption appears to consist of two components—one with a width of 125 km s^-1 and one broader (420 km s^-1)—both toward the compact radio source in the nucleus of the galaxy. Based on these large velocity widths, we suggest that the H i absorption is produced in the central parsecs of the galaxy, on a scale similar to that which gives rise to the water maser emission. This brings to eight the number of galaxies known to exhibit both water masers and H i absorption. We explore the relationship between these two phenomena and present a physically motivated (but unfruitful) search for water maser emission in five radio galaxies known to exhibit strong Hi absorption (Refer to PDF file for exact formulas).
Description: RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/
Record URI: http://hdl.handle.net/1850/1790
Publishers URL: http://dx.doi.org/10.1086/340836
Date: 2002-07-20

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