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dc.contributor.authorTowner, Allison P. M.
dc.contributor.authorBrogan, Crystal L.
dc.contributor.authorHunter, Todd R.
dc.contributor.authorCyganowski, Claudia J.
dc.contributor.authorFriesen, Rachel K.
dc.identifier.citationTowner , A P M , Brogan , C L , Hunter , T R , Cyganowski , C J & Friesen , R K 2019 , ' SOFIA FORCAST photometry of 12 Extended Green Objects in the Milky Way ' , Astrophysical Journal , vol. 875 , no. 2 , 135 .
dc.identifier.otherPURE: 258743567
dc.identifier.otherPURE UUID: ae988cdd-306c-4096-8d15-f71eef4e0874
dc.identifier.otherScopus: 85067203517
dc.identifier.otherWOS: 000465974900004
dc.descriptionFunding: UK STFC grant number ST/M001296/1 (CJC).en
dc.description.abstractMassive young stellar objects are known to undergo an evolutionary phase in which high mass accretion rates drive strong outflows. A class of objects believed to trace this phase accurately is the Galactic Legacy Infrared Midplane Survey Extraordinaire (GLIMPSE) Extended Green Object (EGO) sample, so named for the presence of extended 4.5μm emission on size scales of∼0.1pc in Spitzer images. We have been conducting a multi-wavelength examination of a sample of 12 EGOs with distances of 1-5 kpc. In this paper, we present mid-infrared images and photometry of these EGOs obtained with the Stratospheric Observatory for Infrared Astronomy and subsequently construct spectral energy distributions (SEDs) for these sources from the near-infrared to sub-millimeter regimes using additional archival data. We compare the results from graybody models and several publicly-available software packages which produce model SEDs in the context of a single massive protostar. The models yield typical R⋆ ∼10 R⊙, T⋆ ∼103-104 K, and L⋆ ∼1−40 × 103 L⊙; the median L/M for our sample is 24.7 L⊙/M⊙. Model results rarely converge for R⋆  and T⋆, but do for L⋆, which we take to be an indication of the multiplicity and inherently clustered nature of these sources even though, typically, only a single source dominates in the mid-infrared. The median L/M value for the sample suggests that these objects may be in a transitional stage between the commonly described “IR-quiet” and “IR-bright” stages of MYSO evolution. The median Tdust for the sample is less conclusive, but suggests that these objects are either in this transitional stage or occupy the cooler (and presumably younger) part of the IR-bright stage.
dc.relation.ispartofAstrophysical Journalen
dc.rights© 2019, American Astronomical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at
dc.subjectInfrared: generalen
dc.subjectRadiative transferen
dc.subjectStars: formationen
dc.subjectStars: massiveen
dc.subjectStars: protostarsen
dc.subjectTechniques: photometricen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleSOFIA FORCAST photometry of 12 Extended Green Objects in the Milky Wayen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.description.statusPeer revieweden

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