J/ApJ/641/389 Millimetric observations of IRDC cores (Rathborne+, 2006)
Infrared dark clouds: precursors to star clusters.
Rathborne J.M., Jackson J.M., Simon R.
<Astrophys. J., 641, 389-405 (2006)>
=2006ApJ...641..389R 2006ApJ...641..389R
ADC_Keywords: Molecular clouds ; Interstellar medium ; Infrared sources ;
Millimetric/submm sources
Keywords: dust, extinction - ISM: clouds - stars: formation
Abstract:
Infrared dark clouds (IRDCs) are dense molecular clouds seen as
extinction features against the bright mid-infrared Galactic
background. Millimeter continuum maps toward 38 IRDCs reveal extended
cold dust emission to be associated with each of the IRDCs. IRDCs
range in morphology from filamentary to compact and have masses of 120
to 16000M☉, with a median mass of 940M☉. Each IRDC
contains at least one compact (0.5pc) dust core and most show
multiple cores. We find 140 cold millimeter cores unassociated with
MSX 8µm emission.
Description:
The 1.2mm continuum data toward the IRDCs were obtained at the
Institut de Radioastronomie Millimetrique (IRAM) 30m telescope using
the 117 element bolometer array MAMBO II in 2003 December and 2004
January-March.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 66 38 Properties of the IRDCs
table3.dat 91 190 Properties of the IRDC cores
--------------------------------------------------------------------------------
See also:
V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)
J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- MSXDC MSX Dark Cloud identification
15- 16 I2 h RAh Hour of Right Ascension (J2000.0) (1)
18- 19 I2 min RAm Minute of Right Ascension (J2000.0) (1)
21- 24 F4.1 s RAs Second of Right Ascension (J2000.0) (1)
26 A1 --- DE- Sign of the Declination (J2000.0) (1)
27- 28 I2 deg DEd Degree of Declination (J2000.0) (1)
30- 31 I2 arcmin DEm Arcminute of Declination (J2000.0) (1)
33- 36 F4.1 arcsec DEs Arcsecond of Declination (J2000.0) (1)
38- 41 F4.1 km/s VLSR LSR velocity (2)
43- 45 F3.1 km/s e_VLSR Error in VLSR (2)
47- 49 F3.1 kpc Dist Kinematic distance (2)
51- 54 I4 mJy F(1.2)p Peak flux at 1.2mm
56- 60 F5.2 Jy F(1.2)i Integrated flux at 1.2mm
62- 66 I5 solMass Mass Estimated mass
--------------------------------------------------------------------------------
Note (1): Coordinates of the peak contrast (Simon et al. 2006, J/ApJ/639/227).
Note (2): Data from Simon et al. (2006ApJ...653.1325S 2006ApJ...653.1325S).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- --- [MSXDC]
7- 19 A13 --- MSXDC Infrared dark cloud identification
21- 24 A4 --- m_MSXDC Core identification (1)
26- 27 I2 h RAh Hour of Right Ascension (J2000)
29- 30 I2 min RAm Minute of Right Ascension (J2000)
32- 35 F4.1 s RAs Second of Right Ascension (J2000)
37 A1 --- DE- Sign of the Declination (J2000)
38- 39 I2 deg DEd Degree of Declination (J2000)
41- 42 I2 arcmin DEm Arcminute of Declination (J2000)
44- 45 I2 arcsec DEs Arcsecond of Declination (J2000)
47- 50 I4 mJy F(1.2)p Peak flux at 1.2mm
52- 55 F4.2 Jy F(1.2)i Integrated flux at 1.2mm
57- 58 I2 arcsec Adim Average angular FWHM diameter
60- 63 F4.2 pc Pdim Average physical FWHM diameter
65- 68 I4 Sun Mass Core mass (2)
70- 71 A2 --- n_MSXDC [em] Core associated with 8µm emission
in the MSX images
73- 75 A3 --- OName Other identification from Simon et al.
(2006, J/ApJ/639/227)
77- 80 A4 --- --- [IRAS]
82- 91 A10 --- IRAS IRAS association
--------------------------------------------------------------------------------
Note (1): Named in order of decreasing peak 1.2mm flux with the designation
"MM" (e.g., MM1, MM2, etc).
Note (2): Calculated from the integrated flux from the two-dimensional
Gaussian fit to the core.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 28-Feb-2008