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Title: Observational results of a multi-telescope campaign in search of interstellar urea [(NH{sub 2}){sub 2}CO]

In this paper, we present the results of an observational search for gas phase urea [(NH{sub 2}){sub 2}CO] observed toward the Sgr B2(N-LMH) region. We show data covering urea transitions from ∼100 GHz to 250 GHz from five different observational facilities: the Berkeley-Illinois-Maryland-Association (BIMA) Array, the Combined Array for Research in Millimeter-wave Astronomy (CARMA), the NRAO 12 m telescope, the IRAM 30 m telescope, and the Swedish-ESO Submillimeter Telescope (SEST). The results show that the features ascribed to urea can be reproduced across the entire observed bandwidth and all facilities by best-fit column density, temperature, and source size parameters which vary by less than a factor of two between observations merely by adjusting for telescope-specific parameters. Interferometric observations show that the emission arising from these transitions is cospatial and compact, consistent with the derived source sizes and emission from a single species. Despite this evidence, the spectral complexity of both (NH{sub 2}){sub 2}CO and of Sgr B2(N) makes the definitive identification of this molecule challenging. We present observational spectra, laboratory data, and models, and discuss our results in the context of a possible molecular detection of urea.
Authors:
 [1] ; ; ; ;  [2] ;  [3] ; ;  [4] ; ; ;  [5] ;  [6] ;  [7]
  1. National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
  2. Department of Astronomy, University of Illinois at Urbana-Champaign, Champaign, IL 61801 (United States)
  3. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (United States)
  4. Sensor Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)
  5. Institute of Radio Astronomy of NASU, Chervonopraporna 4, 61002 Kharkov (Ukraine)
  6. Departments of Chemistry and Astronomy, University of Illinois at Urbana-Champaign, Champaign, IL 61801 (United States)
  7. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
22351606
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 783; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; DENSITY; DETECTION; EMISSION; GHZ RANGE; INTERSTELLAR SPACE; MOLECULES; SPECTRA; TELESCOPES