A MID-INFRARED VIEW of the HIGH MASS STAR FORMATION REGION W51A

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dc.contributor.authorBarbosa C.L.
dc.contributor.authorBlum R.D.
dc.contributor.authorDamineli A.
dc.contributor.authorConti P.S.
dc.contributor.authorGusmao D.M.
dc.date.accessioned2019-08-19T23:47:23Z
dc.date.available2019-08-19T23:47:23Z
dc.date.issued2016
dc.description.abstract© 2016. The American Astronomical Society. All rights reserved.In this paper we present the results of a mid-infrared study of G49.5-0.4, or W51A, part of the massive starbirth complex W51. Combining public data from the Spitzer IRAC camera, and Gemini mid-infrared camera T-ReCS at 7.73, 9.69, 12.33, and 24.56 μm, with a spatial resolution of ∼0.″5, we have identified the mid-infrared counterparts of eight ultracompact H ii regions, showing that two radio sources are deeply embedded in molecular clouds and another is a cloud of ionized gas. From the T-ReCS data we have unveiled the central core of the W51 region, revealing massive young stellar candidates. We modeled the spectral energy distribution of the detected sources. The results suggest that the embedded objects are sources with spectral types ranging from B3 to O5, but the majority of the fits indicate stellar objects with B1 spectral types. We also present an extinction map of IRS 2, showing that a region with lower extinction corresponds to the region where a proposed jet of gas has impacted the foreground cloud. From this map, we also derived the total extinction toward the enigmatic source IRS 2E, which amounts to ∼60 mag in the V band. We calculated the color temperature due to thermal emission of the circumstellar dust of the detected sources; the temperatures are in the interval of ∼100-150 K, which corresponds to the emission of dust located at 0.1 pc from the central source. Finally, we show a possible mid-infrared counterpart of a detected source at millimeter wavelengths that was found by Zapata et al. to be a massive young stellar object undergoing a high accretion rate.
dc.description.firstpage54
dc.description.issuenumber1
dc.description.volume825
dc.identifier.citationBarbosa, C. L.; BLUM, R. D.; Damineli, A.; Conti, P. S.; GUSMÃO, D. M.. A MID-INFRARED VIEW OF THE HIGH MASS STAR FORMATION REGION W51A. Astrophysical Journal (Online), v. 825, n. 1, p. 54, 2016.
dc.identifier.doi10.3847/0004-637X/825/1/54
dc.identifier.issn1538-4357
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/1514
dc.relation.ispartofAstrophysical Journal
dc.rightsAcesso Aberto
dc.subject.otherlanguageCircumstellar matter
dc.subject.otherlanguageinfrared: ISM
dc.subject.otherlanguageinfrared: stars
dc.subject.otherlanguageStars: early-type
dc.subject.otherlanguagestars: formation
dc.subject.otherlanguagestars:massive
dc.titleA MID-INFRARED VIEW of the HIGH MASS STAR FORMATION REGION W51A
dc.typeArtigo
fei.scopus.citations7
fei.scopus.eid2-s2.0-84978272025
fei.scopus.updated2024-11-01
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84978272025&origin=inward
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