VII/244A Atlas and Catalog of Dark Clouds (Dobashi+, 2005)
Atlas and Catalog of Dark Clouds Based on Digitized Sky Survey I
Dobashi K., Uehara H., Kandori R., Sakurai T., Kaiden M., Umemoto T.,
Sato F.
<Publ. Astron. Soc. Japan, 57, S1-S386 (2005)>
=2005PASJ...57S...1D 2005PASJ...57S...1D
ADC_Keywords: Molecular clouds ; Extinction ; Interstellar medium
Keywords: ISM: cloud - ISM: dust - ISM: extinction
Description:
Here we release the first version of the atlas and catalog of dark
clouds derived by using the optical database Digitized Sky Survey I
(DSS). Applying a traditional star-count technique to 1043 plates
contained in DSS, we have produced an Av map covering the entire
region in the galactic latitude range |b|=<40°. The map was
drawn at two different angular resolutions of 6' and 18', and is
released in FITS format.
Based on the Av map, we identified 2448 dark clouds and 2841 clumps
located inside them. Physical parameters, such as the position,
extent, and optical extinction, were measured for each of the clouds
and clumps. We also searched for counterparts among already known dark
clouds in the literature. The catalog of dark clouds presented here
lists the cloud parameters as well as the counterparts.
Printed version of the atlas and catalog was published in a special
issue of Publications of the Astronomical Society of Japan (PASJ) in
February 2005 (Dobashi et al., 2005, PASJ, 57, pp.S1-S386).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hclumps.dat 88 5046 Catalog of dark clouds and clumps identified
in the high-resolution Av map (hpbw=6')
hassoc.dat 94 2460 List of associated dark clouds in the
high-resolution Av map
lclumps.dat 88 243 Catalog of dark clouds and clumps identified
in the low-resolution Av map (hpbw=18')
lassoc.dat 37 37 List of associated dark clouds in the
low-resolution Av map
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See also:
http://astro.u-gakugei.ac.jp/~tenmon/Atlas/index.html : Catalog home page
VII/7 : Lynds' Catalogue of Dark Nebulae (LDN) (Lynds 1962)
V/112 : Catalog of Star-Forming Regions in the Galaxy (Avedisova, 2002)
VII/191 : Catalogue of Southern Dark Clouds (Hartley+ 1986)
VII/68 : Dark Nebulae and Globules for l=240-360deg (Feitzinger+ 1984)
J/A+A/383/631 : Catalogue of dust clouds in the Galaxy (Dutra+, 2002)
Byte-by-byte Description of file: hclumps.dat lclumps.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- TGU [LH0-9 ] Cloud designation (1)
7- 9 I3 --- Ncl ? Number of clumps in the cloud
11- 14 A4 --- Clump [P0-9 ] Sequential number (PNNN) of clump (1)
16- 21 F6.2 deg GLON Galactic longitude of the clouds and clumps
23- 28 F6.2 deg GLAT Galactic latitude of the clouds and clumps
30- 34 F5.2 deg dGLON Extent of the clouds and clumps in galactic
longitude
36- 40 F5.2 deg dGLAT Extent of the clouds and clumps in galactic
latitude
42- 49 E8.3 deg2 S Surface area of the clouds and clumps
51- 54 F4.1 mag Av Peak Av value of the clouds and clumps
in the original Av map
56- 59 F4.1 mag Av2 ? Peak Av value of the clouds and clumps in the
filtered Av map (2)
61- 65 F5.2 mag dAv ? Noise level (2)
67- 74 E8.3 mag.deg2 SAv Extinction integrated over the surface area
in the original Av map
76- 83 E8.3 mag.deg2 SAv2 ? Extinction integrated over the surface area
in the filtered Av map (2)
85- 86 I2 --- Nc Number of counterparts found in the literature
88- 88 I1 --- Flag [0,1]? Flag for a large uncertainty due to a
very small number of stars (=<2) found in the
high-resolution (6') map; or a large cloud
extending outside the Av map
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Note (1): the cloud number starts by L or H (for low of high resolution),
is followed by a sequence number, and eventually by a clump number.
TGU stands for "Tokyo Gakugei University catalog".
Note (2): in the high-resolution maps only (hpbw=6')
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Byte-by-byte Description of file: hassoc.dat lassoc.dat
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Byte Format Unit Label Explanations
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1- 5 A5 --- TGU [LH0-9 ] Cloud designation
6- 9 A4 --- Clump [P0-9 ] Sequential number of the clump
13- 14 I2 --- Seq Sequential number for associated dark cloud
16- 94 A79 --- Names Names of associated dark clouds found in a
list compiled by Dutra and Bica (J/A+A/383/631)
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History:
* 21-Jun-2005: Preparation of the ReadMe by Koichi Nakajima [ADAC]
* 24-May-2007: Addition of 'L' and 'H' in the cloud designation,
to differentiate the clouds found from the 2 resolutions.
(End) Koichi Nakajima [ADAC], Francois Ochsenbein [CDS] 21-Jun-2005