J/A+A/463/175 Infrared study of IRAS 14416-5937 region (Vig+, 2007)
Infrared study of the southern Galactic star-forming region associated
with IRAS 14416-5937.
Vig S., Ghosh S.K., Ojha D.K., Verma R.P.
<Astron. Astrophys., 463, 175-186 (2007)>
=2007A&A...463..175V 2007A&A...463..175V
ADC_Keywords: Infrared sources ; YSOs ; Photometry, infrared ;
Cross identifications
Keywords: infrared: ISM - ISM: H II regions -
ISM: individual objects: IRAS 14416-5937 - stars: pre-main sequence
Abstract:
We have carried out an infrared study of the southern Galactic massive
star-forming region associated with IRAS 14416-5937. This star-forming
region has been mapped simultaneously in two far infrared bands at
∼150 & 210 micron using the TIFR 1-m balloon borne telescope with ∼1'
angular resolution. We have used the 2MASS JHKs data as well as the
GLIMPSE-Spitzer data of this region to study the stellar populations
of the embedded young cluster. This region comprises of two sources
designated as A and B, separated by ∼2pc. The spectrum of a region
located close to the source A obtained using the Long Wavelength
Spectrometer (LWS) on-board the Infrared Space Observatory (ISO) is
presented. Emission from warm dust and the unidentified infrared bands
(UIBs) is estimated using the mid-infrared data from the MSX survey.
The spatial distribution of the temperature of cool dust and optical
depth at 200 micron have been obtained taking advantage of the similar
beams in the two TIFR bands. A number of atomic fine structure lines
have been detected in the ISO-LWS spectrum, which have been used to
estimate the electron density and the effective temperature of the
ionising radiation in this region. From the near and mid infrared
images, we identify a dust lane due north-west direction of the source
A. The dust lane is populated by Class I type sources. Class II type
sources are found further along the dust lane as well as below it.
Self consistent radiative transfer models of the two sources (A and B)
are in good agreement with the observed spectral energy distributions.
The spatial distribution of young stellar objects in and around the
dust lane suggests that active star formation is taking place along
the dust lane and is possibly triggered by the expanding HII regions
of A and B.
Description:
Young stellar objects in the star-forming region associated with IRAS
14416-5937 (also G316.8-0.1) selected on the basis of near-infrared
(2MASS) and mid-infrared (Spitzer-GLIMPSE IRAC) colour-colour
diagrams. For each 2MASS object, the associated GLIMPSE Archive object
(within a search radius of 0.8") and vice-versa have been listed. The
designations (2MASS and GLIMPSE), equatorial coordinates (J2000) in
degrees, as well as magnitudes of the young stellar objects have been
listed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
irac.dat 141 36 Details of Young Stellar Objects (YSOs) selected
from the Spitzer-GLIMPSE survey based on IRAC
([3.6]-[4.5) vs. [5.8]-[8.0]) colour-colour diagram
2mass.dat 136 36 Details of infrared excess sources (YSOs) selected
from the 2MASS based on JHKs (J-H vs. H-Ks)
colour-colour diagram
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
http://www.astro.wisc.edu/glimpse/ : GLIMPSE Home Page
Byte-by-byte Description of file: irac.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- GLIMPSE Spitzer-GLIMPSE designation
20- 29 F10.6 deg RAdeg Right Ascension (J2000)
32- 41 F10.6 deg DEdeg Declination (J2000)
43- 47 F5.2 mag [3.6]mag Magnitude at 3.6 micron IRAC band
49- 52 F4.2 mag e_[3.6]mag Error in [3.6]mag
54- 58 F5.2 mag [4.5]mag Magnitude at 4.5 micron IRAC band
60- 63 F4.2 mag e_[4.5]mag Error in [4.5]mag
65- 69 F5.2 mag [5.8]mag Magnitude at 5.8 micron IRAC band
71- 74 F4.2 mag e_[5.8]mag Error in [5.8]mag
76- 80 F5.2 mag [8.0]mag Magnitude at 8.0 micron IRAC band
82- 85 F4.2 mag e_[8.0]mag Error in [8.0]mag
87-103 A17 --- 2MASS 2MASS designation
105-109 F5.2 mag Jmag ?=99.99 Magnitude at J band (G1)
111-114 F4.2 mag e_Jmag ?=9.99 Error in Jmag (G1)
116-120 F5.2 mag Hmag ?=99.99 Magnitude at H band (G1)
122-125 F4.2 mag e_Hmag ?=9.99 Error in Hmag (G1)
127-131 F5.2 mag Ksmag ?=99.99 Magnitude at Ks band (G1)
133-136 F4.2 mag e_Ksmag ?=9.99 Error in Ksmag (G1)
138-141 A4 --- Class Class I, Class I/II or Class II YSO
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Byte-by-byte Description of file: 2mass.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 2MASS 2MASS designation
20- 29 F10.6 deg RAdeg Right Ascension (J2000)
32- 41 F10.6 deg DEdeg Declination (J2000)
43- 47 F5.2 mag Jmag Magnitude at J band
49- 52 F4.2 mag e_Jmag Error in Jmag
54- 58 F5.2 mag Hmag Magnitude at H band
60- 63 F4.2 mag e_Hmag Error in Hmag
65- 69 F5.2 mag Ksmag Magnitude at Ks band
71- 74 F4.2 mag e_Ksmag Error in Ksmag
76- 92 A17 --- GLIMPSE Spitzer-GLIMPSE designation
94- 98 F5.2 mag [3.6]mag ?=99.99 Magnitude at 3.6 micron IRAC band (G1)
100-103 F4.2 mag e_[3.6]mag ?=9.99 Error in [3.6]mag (G1)
105-109 F5.2 mag [4.5]mag ?=99.99 Magnitude at 4.5 micron IRAC band (G1)
111-114 F4.2 mag e_[4.5]mag ?=9.99 Error in [4.5]mag (G1)
116-120 F5.2 mag [5.8]mag ?=99.99 Magnitude at 5.8 micron IRAC band (G1)
122-125 F4.2 mag e_[5.8]mag ?=9.99 Error in [5.8]mag (G1)
127-131 F5.2 mag [8.0]mag ?=99.99 Magnitude at 8.0 micron IRAC band (G1)
133-136 F4.2 mag e_[8.0]mag ?=9.99 Error in [8.0]mag (G1)
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Global notes:
Note (G1): Magnitude (error) assigned a value of 99.99 (9.99) implies that
the source is not detected in the corresponding band.
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Acknowledgements:
Sarita Vig, sarita(at)arcetri.astro.it
(End) Sarita Vig [TIFR, India], Patricia Vannier [CDS] 08-Mar-2007