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Discovery of a Distant Star Formation Region Using Glimpse


Mercer, EP and Clemens, DP and Bania, TM and Jackson, JM and Rathborne, JM and Shah, RY and Babler, BL and Indebetouw, R and Meade, MR and Watson, C and Whitney, BA and Wolff, MJ and Wolfire, MG and Benjamin, RA and Cohen, M and Dickey, JM and Kobulnicky, HA and Marston, AP and Mathis, JS and Stauffer, JR and Stolovy, SR and Churchwell, EB, Discovery of a Distant Star Formation Region Using Glimpse, The Astrophysical Journal Supplement Series, 154, (1) pp. 328-332. ISSN 0067-0049 (2004) [Refereed Article]

DOI: doi:10.1086/422815


Examination of early, in-orbit checkout (IOC) images of a portion of the Galactic plane obtained by the Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope revealed the presence of an extended emission nebula with internal structure. The Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) data show this nebula, located at l ∼ 42° and b ∼ 0.5°, contains bright point sources and two nonstellar regions. Ancillary data sets were used to help reveal the nature of this nebula and its exciting objects. In particular, 13CO J = 1 → 0 line emission mapped by the Galactic Ring Survey (GRS) shows molecular gas associated with the infrared nebula. The 13CO radial velocity yields a far-kinematic distance of 11.1 kpc to the nebula, since there is no evidence for H I self-absorption. At 11.1 kpc, the far-infrared luminosity of the nebula is 4.8 × 10 4 L⊙, and the mass of its molecular cloud is 1.1 × 10-4 M⊙. The spectral energy distribution rises steeply from 2.2 to 100 μm with an absorption feature at 10 μm, exhibiting the shape of a late Class 0 young stellar object (YSO). The radio continuum flux observed toward the nebula is consistent with the free-free emission from one or more massive YSOs (MYSOs) with spectral types in the range O9 to B0. This analysis demonstrates one technique the GLIMPSE team will use for revealing thousands of Galactic star formation regions.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:35935
Year Published:2004
Web of Science® Times Cited:7
Deposited By:Physics
Deposited On:2005-09-20
Last Modified:2011-11-29

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