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dc.contributor.authorScibelli, Samantha
dc.contributor.authorShirley, Yancy
dc.date.accessioned2020-06-27T02:02:30Z
dc.date.available2020-06-27T02:02:30Z
dc.date.issued2020-03-05
dc.identifier.citationSamantha Scibelli and Yancy Shirley 2020 ApJ 891 73en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ab7375
dc.identifier.urihttp://hdl.handle.net/10150/641773
dc.description.abstractThe detection of complex organic molecules (COMs) toward dense, collapsing prestellar cores has sparked interest in the fields of astrochemistry and astrobiology, yet the mechanisms for COM formation are still debated. It was originally believed that COMs first form in ices, only to be irradiated by UV radiation from the surrounding interstellar radiation field as well as forming protostars, and subsequently photodesorbed into the gas phase. However, starless and prestellar cores do not have internal protostars to heat up and sublimate the ices. Alternative models using chemical energy have been developed to explain the desorption of COMs, yet in order to test these models, robust measurements of COM abundances are needed toward representative samples of cores. We have conducted a large sample survey of 31 starless and prestellar cores in the Taurus molecular cloud, detecting methanol (CH3OH) in 100% of the cores targeted and acetaldehyde (CH3CHO) in 70%. At least two transition lines of each molecule were measured, allowing us to place tight constraints on excitation temperature, column density, and abundance. Additional mapping of methanol revealed extended emission detected down to A(V) as low as similar to 3 mag. We find that COMs are detectable in the gas phase and are being formed early, at least hundreds of thousands of years prior to star and planet formation. The precursor molecule, CH3OH, may be chemically linked to the more complex CH3CHO; however, higher spatial resolution maps are needed to further test chemical models.en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2020. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://iopscience.iop.org/info/page/text-and-data-miningen_US
dc.subjectAstrochemistryen_US
dc.subjectStar formationen_US
dc.subjectDense interstellar cloudsen_US
dc.titlePrevalence of Complex Organic Molecules in Starless and Prestellar Cores within the Taurus Molecular Clouden_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume891
dc.source.issue1
dc.source.beginpage73
refterms.dateFOA2020-06-27T02:02:33Z


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