A low fraction of nitrogen in molecular form in a dark cloud
dc.contributor.author | Maret, S. | en_US |
dc.contributor.author | Bergin, E. A. | en_US |
dc.contributor.author | Lada, C. J. | en_US |
dc.date.accessioned | 2009-06-01T17:30:37Z | |
dc.date.available | 2009-06-01T17:30:37Z | |
dc.date.issued | 2006-07-27 | en_US |
dc.identifier.citation | Maret, S.; Bergin, E. A.; Lada, C. J.. (2006) "A low fraction of nitrogen in molecular form in a dark cloud." Nature 442(7101): 425-427. <http://hdl.handle.net/2027.42/62670> | en_US |
dc.identifier.issn | 0028-0836 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/62670 | |
dc.identifier.uri | http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=16871211&dopt=citation | en_US |
dc.description.abstract | Nitrogen is the fifth most abundant element in the Universe. In the interstellar medium, it has been thought to be mostly molecular (N-2)(1). However, N-2 has no observable rotational or vibrational transitions, so its abundance in the interstellar medium remains poorly known. In comets, the N-2 abundance is very low(2,3), while the elemental nitrogen abundance is deficient with respect to the solar value. Moreover, large nitrogen isotopic anomalies are observed in meteorites and interstellar dust particles(4). Here we report the N2H+ (and by inference the N-2) abundance inside a cold dark molecular cloud. We find that only a small fraction of nitrogen in the gas phase is molecular, with most of it being atomic. Because the compositions of comets probably reflect those of dark clouds(5), this result explains the low N-2 abundance in comets. We argue that the elemental nitrogen abundance deficiency in comets can be understood if the atomic oxygen abundance is lower than predicted by present chemical models. Furthermore, the lack of molecular nitrogen in molecular clouds explains the nitrogen anomalies in meteorites and interstellar dust particles, as nitrogen fractionation is enhanced if gaseous nitrogen is atomic(6). | en_US |
dc.format.extent | 227446 bytes | |
dc.format.extent | 2489 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Nature Publishing Group | en_US |
dc.source | Nature | en_US |
dc.title | A low fraction of nitrogen in molecular form in a dark cloud | en_US |
dc.type | Article | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA | en_US |
dc.contributor.affiliationother | Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA | en_US |
dc.identifier.pmid | 16871211 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/62670/1/nature04919.pdf | |
dc.identifier.doi | http://dx.doi.org/10.1038/nature04919 | en_US |
dc.identifier.source | Nature | en_US |
dc.contributor.authoremail | smaret@umich.edu | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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