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Implications of a hot atmosphere/corino from ALMA observations toward NGC 1333 IRAS 4A1

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dc.contributor.author Sahu, Dipen
dc.contributor.author Liu, Sheng-Yuan
dc.contributor.author Su, Yu-Nung
dc.contributor.author Li, Zhi-Yun
dc.contributor.author Lee, Chin-Fei
dc.contributor.author Hirano, Naomi
dc.contributor.author Takakuwa, Shigehisa
dc.date.accessioned 2020-11-20T13:28:57Z
dc.date.available 2020-11-20T13:28:57Z
dc.date.issued 2019-02-20
dc.identifier.citation The Astrophysical Journal, Vol. 872, No. 2,196 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7337
dc.description Restricted Access © The American Astronomical Society https://doi.org/10.3847/1538-4357/aaffda en_US
dc.description.abstract We report high angular resolution observations of NGC 1333 IRAS 4A, a protostellar binary including A1 and A2, at 0.84 mm with the Atacama Large Millimeter/submillimeter Array. From the continuum observations, we suggest that the dust emission from the A1 core is optically thick, and A2 is predominantly optically thin. The A2 core, exhibiting a forest of spectral lines including complex molecules, is a well-known hot corino, as suggested by previous works. More importantly, we report, for the first time, solid evidence of complex organic molecules (COMs), including CH3OH, 13CH3OH, CH2DOH, and CH3CHO, associated with the A1 core seen in absorption. The absorption features mostly arise from a compact region around the continuum peak position of the A1 core. Rather than originating from a larger common envelope surrounding the protobinary, the COM features are associated with individual cores A1 and A2. Considering the signatures observed in both continuum and spectral lines, we propose two possible scenarios for IRAS 4A1: the COM absorption lines may arise from a hot-corino-like atmosphere at the surface of an optically thick circumstellar disk around A1, or the absorption may arise from different layers of a temperature-stratified, dense envelope. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Astrochemistry en_US
dc.subject ISM: abundances en_US
dc.subject ISM: individual objects (NGC 1333 IRAS 4A) en_US
dc.subject ISM: molecules en_US
dc.subject stars: formation en_US
dc.title Implications of a hot atmosphere/corino from ALMA observations toward NGC 1333 IRAS 4A1 en_US
dc.type Article en_US

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