Physical Characteristics Of G331.5-0.1: The Luminous Central Region Of A Giant Molecular Cloud

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dc.contributor.utaustinauthorMerello, Manuelen_US
dc.contributor.utaustinauthorEvans, Neal J.en_US
dc.creatorMerello, Manuelen_US
dc.creatorBronfman, Leonardoen_US
dc.creatorGaray, Guidoen_US
dc.creatorNyman, Lars-Akeen_US
dc.creatorEvans, Neal J.en_US
dc.creatorWalmsley, C. Malcomen_US
dc.date.accessioned2016-04-28T19:33:40Z
dc.date.available2016-04-28T19:33:40Z
dc.date.issued2013-09en
dc.description.abstractWe report molecular line and dust continuum observations toward the high-mass star-forming region G331.5-0.1, one of the most luminous regions of massive star formation in the Milky Way, located at the tangent region of the Norma spiral arm, at a distance of 7.5 kpc. Molecular emission was mapped toward the G331.5-0.1 GMC in the CO(J = 1 -> 0) and (CO)-O-18(J = 1. 0) lines with NANTEN, while its central region was mapped in CS(J = 2 -> 1 and J = 5 -> 4) with SEST, and in CS(J = 7 -> 6) and (CO)-C-13(J = 3 -> 2) with ASTE. Continuum emission mapped at 1.2 mm with SIMBA and at 0.87 mm with LABOCA reveal the presence of six compact and luminous dust clumps, making this source one of the most densely populated central regions of a GMC in the Galaxy. The dust clumps are associated with molecular gas and they have the following average properties: size of 1.6 pc, mass of 3.2 x 10(3)M(circle dot), molecular hydrogen density of 3.7 x 10(4) cm(-3), dust temperature of 32 K, and integrated luminosity of 5.7 x 10(5) L-circle dot, consistent with values found toward other massive star-forming dust clumps. The CS and (CO)-C-13 spectra show the presence of two velocity components: a high-velocity component at similar to-89 km s(-1), seen toward four of the clumps, and a low-velocity component at similar to-101 km s(-1) seen toward the other two clumps. Radio continuum emission is present toward four of the molecular clumps, with spectral index estimated for two of them of 0.8 +/- 0.2 and 1.2 +/- 0.2. A high-velocity molecular outflow is found at the center of the brightest clump, with a line width of 26 km s(-1) (FWHM) in CS(J = 7 -> 6). Observations of SiO(J = 7 -> 6 and J = 8. 7), and SO(J(K) = 8(8) -> 7(7) and J(K) = 8(7) -> 7(6)) lines provide estimates of the gas rotational temperature toward this outflow > 120 K and > 75 K, respectively.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipCONICYT through FONDAP 15010003en_US
dc.description.sponsorshipCONICYT through BASAL PFB06en_US
dc.description.sponsorshipa Fulbright Fellowshipen_US
dc.description.sponsorshipNSF AST-1109116en_US
dc.identifierdoi:10.15781/T2SF7B
dc.identifier.Filename2013_09_g331501.pdfen_US
dc.identifier.citationMerello, Manuel, Leonardo Bronfman, Guido Garay, Lars-�ke Nyman, Neal J. Evans II, and C. Malcolm Walmsley. "Physical characteristics of G331. 5-0.1: The luminous central region of a Giant Molecular Cloud." The Astrophysical Journal, Vol. 774, No. 1 (Sep., 2013): 38.en_US
dc.identifier.doi10.1088/0004-637x/774/1/38en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34743
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectism: cloudsen_US
dc.subjectism: moleculesen_US
dc.subjectstars: formationen_US
dc.subjectmassive star-formationen_US
dc.subjecth-ii regionsen_US
dc.subjectmethanol masersen_US
dc.subjectforming regionsen_US
dc.subjectmilky-wayen_US
dc.subjectevolutionary stagesen_US
dc.subjectaperture synthesisen_US
dc.subjectgalactic planeen_US
dc.subjectorion-klen_US
dc.subject1667 mhzen_US
dc.subjectastronomy & astrophysicsen_US
dc.titlePhysical Characteristics Of G331.5-0.1: The Luminous Central Region Of A Giant Molecular Clouden_US
dc.typeArticleen_US

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