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First detection of HCO+ absorption in the Magellanic System


Murray, CE and Stanimirovic, S and McClure-Griffiths, NM and Putman, ME and Liszt, HS and Wong, T and Richter, P and Dawson, JR and Dickey, JM and Lindner, RR and Babler, BL and Allison, JR, First detection of HCO+ absorption in the Magellanic System, The Astrophysical Journal, 808, (1) Article 41. ISSN 0004-637X (2015) [Refereed Article]


Copyright Statement

Copyright 2015 The American Astronomical Society

DOI: doi:10.1088/0004-637X/808/1/41


We present the first detection of HCO+ absorption in the Magellanic System. Using the ATCA, we observed nine extragalactic radio continuum sources behind the Magellanic System and detected HCO+ absorption toward one source located behind the leading edge of the Magellanic Bridge. The detection is located at an LSR velocity of v = 214.0 ± 0.4 km s-1, with an FWHM of Δv = 4.5 ± 1.0 km s-1, and an optical depth of τ(HCO+) = 0.10 ± 0.02. Although there is abundant neutral hydrogen (HI) surrounding the sight line in position–velocity space, at the exact location of the absorber the HI column density is low, <1020 cm-2, and there is little evidence for dust or CO emission from Planck observations. While the origin and survival of molecules in such a diffuse environment remain unclear, dynamical events such as HI flows and cloud collisions in this interacting system likely play an important role.

Item Details

Item Type:Refereed Article
Keywords:interstellar medium, Magellanic Clouds, star formation, ISM: molecules, ISM: structure
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:102292
Year Published:2015
Funding Support:Australian Research Council (DP110104101)
Web of Science® Times Cited:4
Deposited By:Mathematics and Physics
Deposited On:2015-08-11
Last Modified:2017-11-06
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