J/A+A/542/A101 LABOCA 870um mapping of 4 Galactic plane fields (Miettinen, 2012)
LABOCA 870 µm dust continuum mapping of selected infrared-dark cloud regions
in the Galactic plane.
Miettinen O.
<Astron. Astrophys., 542, A101-101 (2012)>
=2012A&A...542A.101M 2012A&A...542A.101M
ADC_Keywords: Galactic plane ; Millimetric/submm sources ; Morphology
Keywords: stars: formation - ISM: clouds - submillimeter: ISM
Abstract:
Imaging surveys of dust emission at (sub)millimetre wavelengths
provide a powerful tool for studying molecular clouds and the early
stages of star formation.
Through submm dust continuum mapping, we attempt to search for genuine
infrared-dark clouds (IRDCs) and precursors to massive stars and
stellar clusters in the Galactic plane, and to determine their basic
physical properties.
We have mapped four selected fields of about 0.5degx0.5deg that
contain Spitzer 8-um dark regions with LABOCA at 870um. Selected
positions in the fields were observed in C17O(2-1) to obtain
kinematic information. The obtained LABOCA maps are used in
conjunction with the Spitzer IR images.
Description:
Our LABOCA observations took place on 19 May 2011, during the UTC time
ranges of 03:17-06:20 and 07:54-10:50.
Fields are G1.87-0.14, G2.11+0.00, G11.36+0.80 and G13.22-0.06.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 380 91 Characteristics of the clumps identified from
the LABOCA maps
notes.dat 79 31 Notes
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See also:
J/ApJ/680/349 : Galactic distribution of IRDCs (Jackson+, 2008)
J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Field Field
13- 23 A11 --- Source Clump (SMM NN(A,B)) designation,
within the field
25 A1 --- n_Source [bh] Note on Source (1)
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 36 F4.1 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 46 I2 arcsec DEs Declination (J2000)
48- 51 F4.2 Jy I870 Peak surface brightnesses at 870um
(in Jy/beam)
53- 56 F4.2 Jy e_I870 rms uncertainty on I870
58- 62 F5.2 Jy S870 Integrated flux density at 870um
64- 67 F4.2 Jy e_S870 rms uncertainty on S870
69- 72 F4.1 arcsec Reff Clump effective radius (in arcsec)
74- 77 F4.2 pc Reffl Clump effective radius (in pc)
79- 82 F4.2 pc e_Reffl rms uncertainty on Reff
84- 88 I5 Msun Mass Mass
90- 93 I4 Msun e_Mass rms uncertainty on Mass
95- 98 F4.1 10+22mm-2 N(H2) H2 column density
100-102 F3.1 10+22mm-2 e_N(H2) rms uncertainty on N(H2)
104-106 F3.1 10+4mm-3 n(H2) H2 density number
108-110 F3.1 10+4mm-3 e_n(H2) rms uncertainty on n(H2)
112-114 A3 --- M8 Morphological code at 8um (2)
115 A1 --- n_M8 [cdefg] Note on M8 (3)
116 A1 --- --- [/]
117 A1 --- M24 Morphological code at 24um (2)
119-380 A262 --- Assos Association (4)
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Note (1): Note on sources as follows:
b = The clump is associated with the marked C17O(2-1)-observation
target position.
h = The clump can be resolved by eye into two "subclumps",
but they are dealt with as a one source by clumpfind.
Note (2): Morphological codes as follows:
e = extended
d = dark
p = point source
g = group
i = diffuse
w = weak
pfg = point source, likely a foreground star
Note (3): Notes on 8um as follows:
c = The 8um point source is associated with SSTGLMC G001.8134-00.1136, which
has the [3.6]-[4.5], [4.5]-[5.8], and [4.5]-[8.0] colours of 0.098,
0.245, and 0.031, respectively, and is likely to be a foreground star.
d = The 8um point source corresponds to SSTGLMC G001.9301-00.1234 with the
colours [3.6]-[4.5]=0.081, [4.5]-[5.8]=0.158, and [4.5]-[8.0]=0.167,
and is likely a foreground star.
e = The 8um point source corresponds to SSTGLMC G001.9716-00.1375 with the
colours [3.6]-[4.5]=-0.033, [4.5]-[5.8]=0.294, and [4.5]-[8.0]=0.141,
and is likely a foreground star.
f = The 8um point source is associated with SSTGLMC G002.0927-00.0039, which
has the [3.6]-[4.5], [4.5]-[5.8], and [4.5]-[8.0] colours of 0.802,
0.775, and 0.290, respectively, and is likely to be a foreground star.
g = The 8um point source corresponds to SSTGLMC G002.2440+00.0447. Its
[3.6]-[4.5], [4.5]-[5.8], and [4.5]-[8.0] colours are, respectively,
0.523, 0.436, and 0.838, and it is likely a foreground star.
Note (4): Remarks on the associated sources.
Offset from the 870-um peak position is indicated in parenthesis (#").
Reference, indicated in parenthesis (#) are detailled in notes.dat file.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Note Note number
4- 79 A76 --- Text Text of the note
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Sep-2012