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  Searches for interstellar HCCSH and H2CCS

McGuire, B. A., Shingledecker, C. N., Willis, E. R., Lee, K. L. K., Martin-Drumel, M.-A., Blake, G. A., et al. (2019). Searches for interstellar HCCSH and H2CCS. The Astrophysical Journal, 883(2): 201. doi:10.3847/1538-4357/ab3b01.

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McGuire, Brett A., Author
Shingledecker, Christopher N.1, Author           
Willis, Eric R., Author
Lee, Kin Long Kelvin, Author
Martin-Drumel, Marie-Aline, Author
Blake, Geoffrey A., Author
Brogan, Crystal L., Author
Burkhardt, Andrew M., Author
Caselli, Paola, Author
Chuang, Ko-Ju, Author
El-Abd, Samer, Author
Hunter, Todd R., Author
Ioppolo, Sergio, Author
Linnartz, Harold, Author
Remijan, Anthony J., Author
Xue, Ci, Author
McCarthy, Michael C., Author
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1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: 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.

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 Dates: 2019-10-04
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab3b01
Other: LOCALID: 3181943
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 883 (2) Sequence Number: 201 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3