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Interstellar Carbodiimide (HNCNH): A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features

McGuire, Brett A. and Loomis, Ryan A. and Charness, Cameron M. and Corby, Joanna F. and Blake, Geoffrey A. and Hollis, Jan M. and Lovas, Frank J. and Jewell, Philip R. and Remijan, Anthony J. (2012) Interstellar Carbodiimide (HNCNH): A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features. Astrophysical Journal Letters, 758 (2). Art. No. L33. ISSN 2041-8205 . http://resolver.caltech.edu/CaltechAUTHORS:20121116-110039972

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Abstract

In this work, we identify carbodiimide (HNCNH), which is an isomer of the well-known interstellar species cyanamide (NH_(2)CN), in weak maser emission, using data from the Green Bank Telescope PRIMOS survey toward Sgr B2(N). All spectral lines observed are in emission and have energy levels in excess of 170 K, indicating that the molecule likely resides in relatively hot gas that characterizes the denser regions of this star-forming region. The anticipated abundance of this molecule from ice mantle experiments is ~10% of the abundance of NH_(2)CN, which in Sgr B2(N) corresponds to ~2 × 10^(13) cm^(–2). Such an abundance results in transition intensities well below the detection limit of any current astronomical facility and, as such, HNCNH could only be detected by those transitions which are amplified by masing.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/2041-8205/758/2/L33DOIUNSPECIFIED
http://iopscience.iop.org/2041-8205/758/2/L33PublisherUNSPECIFIED
http://arxiv.org/abs/1209.1590arXivUNSPECIFIED
Additional Information:© 2012 American Astronomical Society. Received 2012 August 9; accepted 2012 September 7; published 2012 October 1. All authors dedicate this work to Lewis E. Snyder who pioneered the astronomical detection of molecules at radio frequencies. B.A.M. gratefully acknowledges funding by an NSF Graduate Research Fellowship, and M. Emprechtinger for helpful discussions regarding masers.We thank the anonymous referee for very helpful comments. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
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Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
Subject Keywords:astrochemistry; ISM: clouds; ISM: individual objects (Sagittarius B2(N)); ISM: molecules
Record Number:CaltechAUTHORS:20121116-110039972
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121116-110039972
Official Citation:Interstellar Carbodiimide (HNCNH): A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features Brett A. McGuire et al. 2012 ApJ 758 L33
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35516
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:16 Nov 2012 19:33
Last Modified:27 Dec 2012 03:01

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