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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: 2mass.dat
Bytes Format Units Label Explanations
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)
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.
Acknowledgements: Sarita Vig, sarita(at)arcetri.astro.it
(End) Sarita Vig [TIFR, India], Patricia Vannier [CDS] 08-Mar-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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