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Ground-based searches for interstellar H_(2)D^+

van Dishoeck, E. F. and Phillips, T. G. and Keene, J. and Blake, G. A. (1992) Ground-based searches for interstellar H_(2)D^+. Astronomy and Astrophysics, 261 (1). L13-L16. ISSN 0004-6361.

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We present ground-based searches for the 1_(10) - 1_(11) line of interstellar H_(2)D^(+) at 372 GHz which are more sensitive than those obtained from the Kuiper Airborne Observatory by factors of 3-4 for extended sources and by more than two orders of magnitude for compact sources. The line was not detected in a variety of interstellar clouds, including NGC 2264 toward which a possible detection had been suggested previously. The inferred H_(2)D^(+) abundance limits of 10^(-10) - 10^(-11) are still consistent with, but approach the abundances predicted by chemical models. Simultaneous observations of the DCO^(+) 3-2 and N_(2)H^(+) 4-3 lines have been used to place additional limits on the H_(3)^(+) abundance, and suggest 10^(-11) < x(H_(3)^(+))< 10^(-9). The N_(2)H^(+) data also indicate that for NGC 2264, but perhaps not for the other sources, gas-phase N_2 contains a substantial fraction of the available nitrogen in the cloud.

Item Type:Article
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URLURL TypeDescription
van Dishoeck, E. F.0000-0001-7591-1907
Blake, G. A.0000-0003-0787-1610
Additional Information:© 1992 EDP Sciences. Received April 24, accepted May 15, 1992. The authors are grateful to the CSO staff for their support, and to J. Black and J. Rawlings for discussions. Financial backing came from NSF grant AST 90-15755 and the Netherlands Organization for Scientific Research, NWO.
Funding AgencyGrant Number
NSFAST 90-15755
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Subject Keywords:Interstellar molecules: H2D+; Molecular Clouds
Issue or Number:1
Record Number:CaltechAUTHORS:20120919-115851027
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34215
Deposited On:19 Sep 2012 21:21
Last Modified:12 May 2020 21:12

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