Ionized Gas Toward Molecular Clumps: Physical Properties Of Massive Star-Forming Regions

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dc.contributor.utaustinauthorDunham, Miranda K.en_US
dc.creatorJohnston, Katharine G.en_US
dc.creatorShepherd, Debra S.en_US
dc.creatorAguirre, James E.en_US
dc.creatorDunham, Miranda K.en_US
dc.creatorRosolowsky, Eriken_US
dc.creatorWood, Kennethen_US
dc.date.accessioned2016-04-28T19:36:42Z
dc.date.available2016-04-28T19:36:42Z
dc.date.issued2009-12en
dc.description.abstractWe have conducted a search for ionized gas at 3.6 cm, using the Very Large Array, toward 31 Galactic intermediate- and high-mass clumps detected in previous millimeter continuum observations. In the 10 observed fields, 35 H II regions are identified, of which 20 are newly discovered. Many of the H II regions are multiply peaked indicating the presence of a cluster of massive stars. We find that the ionized gas tends to be associated toward the millimeter clumps; of the 31 millimeter clumps observed, nine of these appear to be physically related to ionized gas, and a further six have ionized gas emission within 1'. For clumps with associated ionized gas, the combined mass of the ionizing massive stars is compared to the clump masses to provide an estimate of the instantaneous star formation efficiency. These values range from a few percent to 25%, and have an average of 7% +/- 8%. We also find a correlation between the clump mass and the mass of the ionizing massive stars within it, which is consistent with a power law. This result is comparable to the prediction of star formation by competitive accretion that a power-law relationship exists between the mass of the most massive star in a cluster and the total mass of the remaining stars.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNational Science Foundation AST-9800334, AST-0098562, AST-0100793, AST-0228993, AST-0507657en_US
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canadaen_US
dc.description.sponsorshipU. S. National Science Foundationen_US
dc.description.sponsorshipSTFCen_US
dc.description.sponsorshipNRAO Graduate Student Internship Programen_US
dc.identifierdoi:10.15781/T2CG09
dc.identifier.Filename2009_12_ionizedgas.pdfen_US
dc.identifier.citationJohnston, Katharine G., Debra S. Shepherd, James E. Aguirre, Miranda K. Dunham, Erik Rosolowsky, and Kenneth Wood. "Ionized Gas toward Molecular Clumps: Physical Properties of Massive Star-Forming Regions." The Astrophysical Journal, Vol. 707, No. 1 (Dec., 2009): 283.en_US
dc.identifier.doi10.1088/0004-637x/707/1/283en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34901
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.subjectcircumstellar matteren_US
dc.subjecth ii regionsen_US
dc.subjectradio continuum: starsen_US
dc.subjectstars:en_US
dc.subjectformationen_US
dc.subjectstars: winds, outflowsen_US
dc.subjecth-ii-regionsen_US
dc.subjectultracompact hii-regionsen_US
dc.subjectgalactic ring surveyen_US
dc.subjectneutralen_US
dc.subjecthydrogen absorptionen_US
dc.subjectdust continuum emissionen_US
dc.subjectspitzer-space-telescopeen_US
dc.subjectluminous iras sourcesen_US
dc.subjectarray camera iracen_US
dc.subjectprotostellar objectsen_US
dc.subjectkinematic distancesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleIonized Gas Toward Molecular Clumps: Physical Properties Of Massive Star-Forming Regionsen_US
dc.typeArticleen_US

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