J/A+A/598/A76 Six infrared dark clouds multi-wavelength obs. (Zhang+, 2017)
A multi-wavelength observation and investigation towards six infrared dark
clouds.
Zhang C.-P., Yuan J.-H., Li G.-X., Zhou J.-J., Wang J.-J.
<Astron. Astrophys. 598, A76 (2017)>
=2017A&A...598A..76Z 2017A&A...598A..76Z (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way - Interstellar medium ; Radio lines
Keywords: infrared: stars - stars: formation - ISM: IRDCs - HII regions -
radio lines: ISM
Abstract:
Infrared dark clouds (IRDCs) are ubiquitous in the Milky Way, yet they
play a crucial role in breeding newly-formed stars.
In order to further understand the dynamics, chemistry, and evolution
of IRDCs, we carried out multi-wavelength observations towards a small
sample.
We performed new observations with the IRAM 30m and CSO 10.4m
telescopes, with tracers HCO+, HCN, N2H+, C18O, DCO+, SiO,
and DCN towards six IRDCs G031.97+00.07, G033.69-00.01, G034.43+00.24,
G035.39-00.33, G038.95-00.47, and G053.11+00.05.
Description:
Towards six IRDCs G31, G33, G34, G35, G38, and G53, the
HCO+ (1-0), HNC (1-0), N2H+ (1-0), and C18O (1-0) observations
were carried out during December 2013 and April 2014 using the IRAM
30m telescope on Pico Veleta, Spain.
Objects:
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RA (2000) DE Designation(s)
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18 49 33.7 -00 47 48 G31 = MSXDC G031.97+00.07
18 52 57.6 +00 42 59 G33 = MSXDC G033.69-00.01
18 53 18.9 +01 26 39 G34 = MSXDC G034.43+00.24
18 57 09.0 +02 07 46 G35 = MSXDC G035.39-00.33
19 04 08.3 +05 08 49 G38 = MSXDC G038.95-00.47
19 29 18.1 +17 54 33 G53 = MSXDC G053.11+00.05
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 127 47 Parameters (coordinate, distance, mass, density,
etc.) of the selected cores in the IRDCs
table3.dat 136 45 Gaussian fitting parameters (integrated
intensity, velocity, FWHM, and intensity of
HCO+, HNC, and C18O) with masking absorption
dip towards the selected cores in the IRDCs
table4.dat 85 6 Parameters of the detected DCO+, SiO, and DCN
in the IRDCs
list.dat 109 24 List of datacubes
fits/* . 24 Individual datacubes
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See also:
J/A+A/552/A40 : MSX high-contrast IRDCs with NH3 (Chira+, 2013)
J/A+A/570/A51 : Molecular lines in 4 IRCS clumps (Shipman+, 2014)
J/A+A/571/A53 : 4 IRDC data cubes (Beuther+, 2014)
J/A+A/578/A29 : Column density maps in 4 IRDCs (Schneider+, 2015)
J/A+A/579/A51 : Kinematic and thermal structure of IRDCs (Bihr+, 2015)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Core Core name (GNN-NN) (G1)
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 17 F4.1 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 27 I2 arcsec DEs Declination (J2000)
29- 31 F3.1 kpc Dist Distance (2)
33- 36 F4.2 pc Rcore Code radius
38- 41 F4.1 K Tdust Dust temperature
43- 45 F3.1 K e_Tdust rms uncertainty on Tdust
47- 51 F5.2 Jy/beam I870um Integrated flux at 870um
53- 56 F4.2 Jy/beam e_I870um rms uncertainty on I870um
58- 62 F5.2 Jy S870um Flux density at 870um
64- 67 F4.2 Jy e_S870um rms uncertainty on S870um
69- 72 F4.2 km/s DVN2H+ N2H+ FWHM
74- 77 F4.2 km/s e_DVN2H+ rms uncertainty on DVN2H+
79- 82 F4.2 --- tauN2H+ N2H+ optical depth
84- 87 F4.2 --- e_tauN2H+ rms uncertainty on tauN2H+
89- 91 I3 Msun Mvir Virial mass
93- 94 I2 Msun e_Mvir rms uncertainty on Mvir
96- 99 I4 Msun M870um Mass at 870um
101-103 I3 Msun e_M870um rms uncertainty on M970um
105-108 I4 Msun M1.1mm ?=- Mass at 1.1mm
110-113 F4.2 --- alphaVir Virial alpha parameter (Mvir/M870um)
115-118 F4.2 --- e_alphaVir rms uncertainty on alphaVir
120-123 F4.1 10+4cm-3 n870um Volume density at 870um (M870um/(2Rcore)3))
125-127 F3.1 10+4cm-3 e_n870um rms uncertainty on n870um
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Note (2): The distances refer to the works from Rathborne et al.
(2006, Cat. J/ApJ/641/389) and Simon et al. (2006, Cat. J/ApJ/653/1325).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Core Code name (GNN-NN) (G1)
8- 12 F5.2 K.km/s SHCO+ HCO+ flux density
14- 17 F4.2 K.km/s e_SHCO+ rms uncertainty on SHCO+
19- 24 F6.2 km/s VHCO+ HCO+ velocity
26- 29 F4.2 km/s e_VHCO+ rms uncertainty on VHCO+
31- 35 F5.2 km/s DHCO+ HCO+ FWHM
37- 40 F4.2 km/s e_DHCO+ rms uncertainty on DHCO+
42- 45 F4.2 K IHCO+ HCO+ integrated flux
47- 50 F4.2 K e_IHCO+ rms uncertainty on IHCO+
52- 56 F5.2 K.km/s SHNC HNC flux density
58- 61 F4.2 K.km/s e_SHNC rms uncertainty on SHNC
63- 68 F6.2 km/s VHNC HNC velocity
70- 73 F4.2 km/s e_VHNC rms uncertainty on VHNC
75- 78 F4.2 km/s DHNC HNC FWHM
80- 83 F4.2 km/s e_DHNC rms uncertainty on DHNC
85- 88 F4.2 K IHNC HNC integrated flux
90- 93 F4.2 K e_IHNC rms uncertainty on IHNC
95- 99 F5.2 K.km/s SC18O C18O flux density
101-104 F4.2 K.km/s e_SC18O rms uncertainty on SC18O
106-111 F6.2 km/s VC18O C18O velocity
113-116 F4.2 km/s e_VC18O rms uncertainty on VC18O
118-121 F4.2 km/s DC18O C18O FWHM
123-126 F4.2 km/s e_DC18O rms uncertainty on DC18O
128-131 F4.2 K IC18O C18O integrated flux
133-136 F4.2 K e_IC18O rms uncertainty on IC18O
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Core Code name (GNN-NN)
8- 12 F5.2 km/s Vel Velocity
14- 17 F4.2 km/s e_Vel rms uncertainty on Velocity
19- 22 F4.2 km/s DV(DCO+) DCO+ FWHM
24- 27 F4.2 km/s e_DV(DCO+) rms uncertainty on DV(DCO+)
29- 33 F5.3 K TMB(DCO+) DCO+ main beam temperature
35- 39 F5.3 K e_TMB(DCO+) rms uncertainty on TMB(DCO+)
41- 45 F5.2 km/s DV(SiO) SiO FWHM
47- 50 F4.2 km/s e_DV(SiO) rms uncertainty on DV(SiO)
52- 56 F5.3 K TMB(SiO) SiO main beam temperature
58- 62 F5.3 K e_TMB(SiO) rms uncertainty on TMB(SiO)
64- 68 F5.2 km/s DV(DCN) ?=- DCN FWHM
70- 73 F4.2 km/s e_DV(DCN) ? rms uncertainty on DV(DCN)
75- 79 F5.3 K TMB(DCN) ?=- DCN main beam temperature
81- 85 F5.3 K e_TMB(DCN) ? rms uncertainty on TMB(DCN)
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 21 I2 --- Nx Number of pixels along X-axis
23- 25 I3 --- Ny Number of pixels along Y-axis
27- 30 I4 --- Nz Number of slices
32- 42 F11.4 m/s bVel Lower value of velocity interval
44- 51 F8.1 m/s BVel Upper value of velocity interval
53- 59 F7.3 m/s dVel Velocity resolution
61- 65 I5 Kibyte size Size of FITS file
67- 80 A14 --- FileName Name of FITS file, in subdirectory fits
81-109 A29 --- Title Title of the FITS file
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Global notes:
Note (G1): The duplicated sources, e.g. G31-3, indicate that the corresponding
spectra have two velocity components within core size.
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Acknowledgements:
Chuan Peng Zhang, zcp0507(at)gmail.com
(End) Patricia Vannier [CDS] 01-Dec-2016