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Searches for Interstellar HCCSH and H₂CCS

McGuire, Brett A. and Shingledecker, Christopher N. and Willis, Eric R. and Lee, Kin Long Kelvin and Martin-Drumel, Marie-Aline and Blake, Geoffrey A. and Brogan, Crystal L. and Burkhardt, Andrew M. and Caselli, Paola and Chuang, Ko-Ju and El-Abd, Samer and Hunter, Todd R. and Ioppolo, Sergio and Linnartz, Harold and Remijan, Anthony J. and Xue, Ci and McCarthy, Michael C. (2019) Searches for Interstellar HCCSH and H₂CCS. Astrophysical Journal, 883 (2). Art. No. 201. ISSN 1538-4357. doi:10.3847/1538-4357/ab3b01.

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A longstanding problem in astrochemistry is the inability of many current models to account for missing sulfur content. Many relatively simple species that may be good candidates to sequester sulfur have not been measured experimentally at the high spectral resolution necessary to enable radioastronomical identification. On the basis of new laboratory data, we report searches for the rotational lines in the microwave, millimeter, and submillimeter regions of the sulfur-containing hydrocarbon HCCSH. This simple species would appear to be a promising candidate for detection in space owing to the large dipole moment along its b-inertial axis, and because the bimolecular reaction between two highly abundant astronomical fragments (CCH and SH radicals) may be rapid. An inspection of multiple line surveys from the centimeter to the far-infrared toward a range of sources from dark clouds to high-mass star-forming regions, however, resulted in nondetections. An analogous search for the lowest-energy isomer, H₂CCS, is presented for comparison, and also resulted in nondetections. Typical upper limits on the abundance of both species relative to hydrogen are 10^(−9)–10^(−10). We thus conclude that neither isomer is a major reservoir of interstellar sulfur in the range of environments studied. Both species may still be viable candidates for detection in other environments or at higher frequencies, providing laboratory frequencies are available.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
McGuire, Brett A.0000-0003-1254-4817
Shingledecker, Christopher N.0000-0002-5171-7568
Willis, Eric R.0000-0002-7475-3908
Lee, Kin Long Kelvin0000-0002-1903-9242
Martin-Drumel, Marie-Aline0000-0002-5460-4294
Blake, Geoffrey A.0000-0003-0787-1610
Brogan, Crystal L.0000-0002-6558-7653
Burkhardt, Andrew M.0000-0003-0799-0927
Caselli, Paola0000-0003-1481-7911
Hunter, Todd R.0000-0001-6492-0090
Ioppolo, Sergio0000-0002-2271-1781
Linnartz, Harold0000-0002-8322-3538
Remijan, Anthony J.0000-0001-9479-9287
Xue, Ci0000-0003-2760-2119
McCarthy, Michael C.0000-0002-5450-5894
Additional Information:© 2019 The American Astronomical Society. Received 2019 July 31; revised 2019 August 12; accepted 2019 August 12; published 2019 October 4. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2015.A.00022.T and #2017.1.00717.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The Green Bank Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Support for B.A.M. was provided by NASA through Hubble Fellowship grant #HST-HF2-51396 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. C.N.S. thanks the Alexander von Humboldt Stiftung/Foundation for their generous support. M.C.M. acknowledges support from NASA grants NNX13AE59G and 80NSSC18K0396, and NSF grant AST-1615847. M.-A. M.-D. is thankful to the Programme National "Physique et Chimie du Milieu Interstellaire" (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES for support.
Group:Astronomy Department
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF2-51396
Alexander von Humboldt FoundationUNSPECIFIED
Stiftung VolkswagenwerkUNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut National des Sciences de l'Univers (INSU)UNSPECIFIED
Commissariat à l'énergie atomique (CEA)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:Astrochemistry; Chemical abundances; Interstellar molecules; Interstellar medium
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Astrochemistry (75); Chemical abundances (224); Interstellar molecules (849); Interstellar medium (847)
Record Number:CaltechAUTHORS:20191004-093925417
Persistent URL:
Official Citation:Brett A. McGuire et al 2019 ApJ 883 201
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99070
Deposited By: Tony Diaz
Deposited On:04 Oct 2019 16:59
Last Modified:16 Nov 2021 17:43

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