A Herschel and BIMA study of the sequential star formation near the 48A HII region

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DOIResolve DOI: http://doi.org/10.1093/mnras/stu300
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
Volume440
Issue1
Pages427447; # of pages: 21
Subjectstar formation; ISM clouds; dust; extinction; Hii regions; ISM individual objects; W-48A; ISM molecules
AbstractWe present the results of Herschel HOBYS (Herschel imaging survey of OB Young Stellar objects) photometricmapping combined with Berkeley Illinois Maryland Association (BIMA) observations and additional archival data, and perform an in-depth study of the evolutionary phases of the star-forming clumps in W 48A and their surroundings. Age estimates for the compact sources were derived from bolometric luminosities and envelope masses, which were obtained from the dust continuum emission, and agree within an order of magnitude with age estimates from molecular line and radio data. The clumps in W 48A are linearly aligned by age (east-old to west-young): we find a ultra-compact (UC) HII region, a young stellar object (YSO) with class II methanol maser emission, a YSO with a massive outflow and finally the NH2D prestellar cores from Pillai et al. This remarkable positioning reflects the (star) formation history of the region. We find that it is unlikely that the star formation in the W48A molecular cloud was triggered by the UC HII region and discuss the Aquila supershell expansion as a major influence on the evolution of W48A. We conclude that the combination of Herschel continuum data with interferometric molecular line and radio continuum data is important to derive trustworthy age estimates and interpret the origin of large-scale structures through kinematic information.
Publication date
PublisherOxford University Press
LanguageEnglish
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21272683
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Record identifierf25d515f-1882-4141-80e8-23c9d7ffef66
Record created2014-12-03
Record modified2016-05-09
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