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dc.contributor.authorKoepferl, Christine M.
dc.contributor.authorRobitaille, Thomas P.
dc.contributor.authorMorales, Esteban F. E.
dc.contributor.authorJohnston, Katharine G.
dc.identifier.citationKoepferl , C M , Robitaille , T P , Morales , E F E & Johnston , K G 2015 , ' Main-sequence stars masquerading as young stellar objects in the central molecular zone ' Astrophysical Journal , vol. 799 , no. 1 , pp. 1-11 .
dc.identifier.otherPURE: 241143422
dc.identifier.otherPURE UUID: 1d22549b-3238-427d-bb14-2a00f899eccb
dc.identifier.otherBibCode: 2015ApJ...799...53K
dc.identifier.otherScopus: 84921468387
dc.descriptionC.K. is a fellow of the International Max Planck Research School for Astronomy and Cosmic Physics (IMPRS) at the University of Heidelberg, Germany, and acknowledges support.en
dc.description.abstractIn contrast to most other galaxies, star formation rates in the Milky Way can be estimated directly from young stellar objects (YSOs). In the central molecular zone the star formation rate calculated from the number of YSOs with 24 μm emission is up to an order of magnitude higher than the value estimated from methods based on diffuse emission (such as free-free emission). Whether this effect is real or whether it indicates problems with either or both star formation rate measures is not currently known. In this paper, we investigate whether estimates based on YSOs could be heavily contaminated by more evolved objects such as main-sequence stars. We present radiative transfer models of YSOs and of main-sequence stars in a constant ambient medium which show that the main-sequence objects can indeed mimic YSOs at 24 μm. However, we show that in some cases the main-sequence models can be marginally resolved at 24 μm, whereas the YSO models are always unresolved. Based on the fraction of resolved MIPS 24 μm sources in the sample of YSOs previously used to compute the star formation rate, we estimate the fraction of misclassified "YSOs" to be at least 63%, which suggests that the star formation rate previously determined from YSOs is likely to beat least a factor of three too high.en
dc.relation.ispartofAstrophysical Journalen
dc.rights© 2015. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at
dc.subjectGalaxy: centeren
dc.subjectRadiative transferen
dc.subjectStars: formationen
dc.subjectStars: pre-main sequenceen
dc.subjectStars: protostarsen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleMain-sequence stars masquerading as young stellar objects in the central molecular zoneen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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