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J/AJ/137/4072 Infrared photometry of G216-2.5 YSOs (Megeath+, 2009)
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Beginning of ReadMe :J/AJ/137/4072 Infrared photometry of G216-2.5 YSOs (Megeath+, 2009)
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Detection of star formation in the unusually cold giant molecular
cloud G216-2.5.
Megeath S.T., Allgaier E., Young E., Allen T., Pipher J.L., Wilson T.L.
<Astron. J., 137, 4072-4082 (2009)>
=2009AJ....137.4072M
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ADC_Keywords: Molecular clouds ; YSOs ; Photometry, infrared
Keywords: ISM: clouds - stars: formation - stars: pre-main sequence
Abstract:
The giant molecular cloud G216-2.5, also known as Maddalena's cloud
or the Maddalena-Thaddeus cloud, is distinguished by an unusual
combination of high gas mass (1-6x10^5^_Msun), low kinetic
temperatures (10K), and the lack of bright far-IR emission. Although
star formation has been detected in neighboring satellite clouds,
little evidence for star formation has been found in the main body of
this cloud. Using a combination of mid-IR observations with the IRAC
and Multiband Imaging Photometer for Spitzer instruments onboard the
Spitzer Space Telescope, and near-IR images taken with the Flamingos
camera on the KPNO 2.1m telescope, we identify a population of 41
young stars with disks and 33 protostars in the center of the cloud.
Most of the young stellar objects are coincident with a filamentary
structure of dense gas detected in CS (2->1). These observations show
that the main body of G216 is actively forming stars, although at a
low stellar density comparable to that found in the Taurus cloud.
Description:
G216 was observed with the Infrared Array Camera (IRAC) and Multiband
Imaging Photometer for Spitzer (MIPS) instruments onboard the Spitzer
space telescope for the GO program PID 3178.
The field was mapped with the IRAC instrument in two separate
observations on 2005 March 25.
The MIPS data were obtained in four separate observations: two on 2004
October 10, one on 2005 April 1, and one on 2005 April 8.