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Title: INTERSTELLAR CARBODIIMIDE (HNCNH): A NEW ASTRONOMICAL DETECTION FROM THE GBT PRIMOS SURVEY VIA MASER EMISSION FEATURES

Abstract

In this work, we identify carbodiimide (HNCNH), which is an isomer of the well-known interstellar species cyanamide (NH{sub 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 {approx}10% of the abundance of NH{sub 2}CN, which in Sgr B2(N) corresponds to {approx}2 Multiplication-Sign 10{sup 13} cm{sup -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.

Authors:
 [1];  [2]; ;  [3];  [4];  [5];  [6]; ;  [7]
  1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (United States)
  2. Department of Chemistry, University of Virginia, Charlottesville, VA 22904 (United States)
  3. Department of Astronomy, University of Virginia, Charlottesville, VA 22904 (United States)
  4. Division of Chemistry and Chemical Engineering and Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States)
  5. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  6. National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)
  7. National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
Publication Date:
OSTI Identifier:
22078482
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 758; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; CYANAMIDES; ENERGY LEVELS; ICE; INTERSTELLAR GRAINS; ISOMERS; MASERS; MICROWAVE RADIATION; MOLECULES; SENSITIVITY; SPECTRA; STARS; TELESCOPES

Citation Formats

McGuire, Brett A., Loomis, Ryan A., Charness, Cameron M., Corby, Joanna F., Blake, Geoffrey A., Hollis, Jan M., Lovas, Frank J., Jewell, Philip R., and Remijan, Anthony J. INTERSTELLAR CARBODIIMIDE (HNCNH): A NEW ASTRONOMICAL DETECTION FROM THE GBT PRIMOS SURVEY VIA MASER EMISSION FEATURES. United States: N. p., 2012. Web. doi:10.1088/2041-8205/758/2/L33.
McGuire, Brett A., Loomis, Ryan A., Charness, Cameron M., Corby, Joanna F., Blake, Geoffrey A., Hollis, Jan M., Lovas, Frank J., Jewell, Philip R., & Remijan, Anthony J. INTERSTELLAR CARBODIIMIDE (HNCNH): A NEW ASTRONOMICAL DETECTION FROM THE GBT PRIMOS SURVEY VIA MASER EMISSION FEATURES. United States. doi:10.1088/2041-8205/758/2/L33.
McGuire, Brett A., Loomis, Ryan A., Charness, Cameron M., Corby, Joanna F., Blake, Geoffrey A., Hollis, Jan M., Lovas, Frank J., Jewell, Philip R., and Remijan, Anthony J. Sat . "INTERSTELLAR CARBODIIMIDE (HNCNH): A NEW ASTRONOMICAL DETECTION FROM THE GBT PRIMOS SURVEY VIA MASER EMISSION FEATURES". United States. doi:10.1088/2041-8205/758/2/L33.
@article{osti_22078482,
title = {INTERSTELLAR CARBODIIMIDE (HNCNH): A NEW ASTRONOMICAL DETECTION FROM THE GBT PRIMOS SURVEY VIA MASER EMISSION FEATURES},
author = {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.},
abstractNote = {In this work, we identify carbodiimide (HNCNH), which is an isomer of the well-known interstellar species cyanamide (NH{sub 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 {approx}10% of the abundance of NH{sub 2}CN, which in Sgr B2(N) corresponds to {approx}2 Multiplication-Sign 10{sup 13} cm{sup -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.},
doi = {10.1088/2041-8205/758/2/L33},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 758,
place = {United States},
year = {2012},
month = {10}
}