Claire E. Murray, Snezana Stanimirovic, Naomi M. McClure-Griffiths, Mary E. Putman, Harvey S. Liszt, Tony Wong, Philipp Richter, Joanne R. Dawson, John M. Dickey, Robert R. Lindner, Brian L. Babler, James R. Allison
- 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 Delta v = 4.5 +/- 1.0 km s(-1), and an optical depth of tau (HCO+) = 0.10 +/- 0.02. Although there is abundant neutral hydrogen (H I) surrounding the sight line in position-velocity space, at the exact location of the absorber the H I column density is low, <10(20) 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 H I flows and cloud collisions in this interacting system likely play an important role.
MetadatenAuthor details: | Claire E. Murray, Snezana Stanimirovic, Naomi M. McClure-Griffiths, Mary E. Putman, Harvey S. Liszt, Tony Wong, Philipp RichterORCiDGND, Joanne R. Dawson, John M. Dickey, Robert R. Lindner, Brian L. Babler, James R. Allison |
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DOI: | https://doi.org/10.1088/0004-637X/808/1/41 |
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ISSN: | 0004-637X |
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ISSN: | 1538-4357 |
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Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
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Publisher: | IOP Publ. Ltd. |
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Place of publishing: | Bristol |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2015 |
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Publication year: | 2015 |
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Release date: | 2017/03/27 |
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Tag: | ISM: molecules; ISM: structure; Magellanic Clouds |
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Volume: | 808 |
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Issue: | 1 |
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Number of pages: | 6 |
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Funding institution: | National Science Foundation (NSF) Early Career Development (CAREER)
Award [AST-1056780]; NSF Graduate Research Fellowship; Wisconsin Space
Grant Institution; Commonwealth of Australia; NSF |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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Peer review: | Referiert |
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