J/AJ/137/4072 Infrared photometry of G216-2.5 YSOs (Megeath+, 2009)
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 2009AJ....137.4072M
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 (1-6x105_M☉), 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 129 74 Photometry of identified young stellar objects
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- SRC [1/74] Sequential number,
<[MAY2009] NN> in Simbad
4 I1 h RAh Right ascension (J2000)
6- 7 I2 min RAm Right ascension (J2000)
9- 12 F4.1 s RAs Right ascension (J2000)
14 A1 --- DE- Declination sign (J2000)
15 I1 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 21 I2 arcsec DEs Declination (J2000)
23- 27 F5.2 mag Jmag ?=- Flamingos J magnitude
29- 32 F4.2 mag e_Jmag ?=- rms uncertainty on Jmag
33 A1 --- n_Jmag [a] a when magnitude from 2MASS
35- 39 F5.2 mag Hmag ?=- Flamingos H magnitude
41- 44 F4.2 mag e_Hmag ?=- rms uncertainty on Hmag
45 A1 --- n_Hmag [a] a when magnitude from 2MASS
47- 51 F5.2 mag Kmag ?=- Flamingos K magnitude
53- 56 F4.2 mag e_Kmag ?=- rms uncertainty on Kmag
57 A1 --- n_Kmag [a] a when magnitude from 2MASS
59- 63 F5.2 mag [3.6] ?=- Spitzer/IRAC 3.6um magnitude
65- 68 F4.2 mag e_[3.6] ?=- rms uncertainty on [3.6]
70- 74 F5.2 mag [4.5] ?=- Spitzer/IRAC 4.5um magnitude
76- 79 F4.2 mag e_[4.5] ?=- rms uncertainty on [4.5]
81- 85 F5.2 mag [5.8] ?=- Spitzer/IRAC 5.8um magnitude
87- 90 F4.2 mag e_[5.8] ?=- rms uncertainty on [5.8]
92- 96 F5.2 mag [8.0] ?=- Spitzer/IRAC 8.0um magnitude
98-101 F4.2 mag e_[8.0] ?=- rms uncertainty on [8.0]
103-107 F5.2 mag [24] ?=- Spitzer/MIPS 24um magnitude
109-112 F4.2 mag e_[24] ?=- rms uncertainty on [24]
114-118 F5.2 mag [70] ?=- Spitzer/MIPS 70um magnitude
120-123 F4.2 mag e_[70] ?=- rms uncertainty on [70]
125-129 A5 --- Class Classification (Disk or Proto)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Nov-2011