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J/PASJ/63/S1    Atlas and catalog of dark clouds based on 2MASS (Dobashi+, 2011)

Atlas and catalog of dark clouds based on the 2 Micron All Sky Survey. Dobashi K. <Publ. Astron. Soc. Jap., 63, S1-S362 (2011)> =2011PASJ...63S...1D
ADC_Keywords: Molecular clouds; Extinction; Interstellar medium ; Infrared sources Keywords: atlas - catalog - ISM: cloud - ISM: dust - ISM: extinction Abstract: This paper presents an atlas and catalog of dark clouds derived based on the 2 Micron All Sky Survey Point Source Catalog (2MASS PSC). Color excess maps of E(J-H) and E(H-KS) as well as extinction maps of AJ, AH, and AKS_ covering all of the sky have been produced at the 1' grid with a changing angular resolution (∼1'-12'), depending on the regions in the sky. Maps drawn at the lower 15' grid with a fixed 1° resolution were also derived for various sets of threshold magnitudes in the J, H, and KS bands to estimate the background star colors and star densities needed to derive the color excess and extinction maps. The maps obtained in this work are presented on various scales in a series of figures that can be used as an atlas of dark clouds for general research purposes. On the basis of the E(J-H) and AJ maps drawn at the 1' grid, we have carried out a systematic survey for dark clouds all over the sky. In total, we identified 7614 dark clouds, and measured the coordinates, extents, and AV values for each of them. We also searched for their counterparts in a previously published catalog of dark clouds based on the optical photographic plates DSS (Dobashi et al., 2005PASJ...57S...1D, Cat. VII/244). These cloud parameters, including the information of the counterparts, are compiled into a new catalog of dark clouds. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table8.dat 70 7614 Catalog of dark clouds
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) VII/244 : Atlas and Catalog of Dark Clouds (Dobashi+, 2005) Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq [1/7614] Sequential number 6- 8 I3 deg GLONd Galactic longitude of cloud peak position 10- 11 I2 arcmin GLONm Galactic longitude of cloud peak position 13- 15 I3 deg GLATd Galactic latitude of cloud peak position 17- 18 I2 arcmin GLATm Galactic latitude of cloud peak position 20- 26 F7.2 arcmin2 Area Surface area 28- 32 F5.2 mag AV Core absorption in V-band at the peak position 34- 37 F4.2 mag e_AV rms uncertainty on AV 39- 46 F8.2 mag.arcmin2 IAVds Core absorption integrated over the cloud surface 48- 51 F4.2 mag.arcmin2 e_IAVds rms uncertainty on IAVds 53 A1 --- Q [A-C] Rank of reliability in detection (A=best) (1) 55- 61 A7 --- Flag Notes about cloud (2) 63- 70 A8 --- TGU Cloud numbers in the catalog by Dobashi et al. (2005, Cat. VII/244 ) (3)
Note (1): Rank as follows: A = Clouds having a counterpart in one or more other databases, ensuring that the cloud is real (350 clouds) B = Clouds falling in the outskirts of the distribution of dense gas or dust found in other databases, and their counterpart cannot be identified clearly (210 clouds, some of them might be fake) C = Clouds heavily affected by bright stars in the vicinity, and cloud parameters such as AV cannot be measured reliably (54 clouds , some of them might be fake) Note (2): Flag of one or more integer numbers as follows: 0 = Clouds originating from the E(J-H)Xm50 map (5255 clouds) 1 = Clouds originating from the AJ map (2359 clouds) 2 = Distant clouds appearing as a hole in the E(J-H)Xm50 map, but as a bump in the AJ map (Sect. 6.6) (747 clouds) 3 = Clouds possibly contaminated by IR clusters appearing as a hole in the AJ map, but as a bump in the E(J-H)Xm50 map (Sect. 6.4) (543 clouds) 4 = Clouds found in the vicinity of bright stars in the SAO catalog (≲6mag), which may affect our estimate of AV (15 clouds) 5 = Clouds found in the vicinity of bright stars in the 2MASS PSC (≤5mag either in J, H, or KS bands), which may affect our estimates of AV (40 clouds) 6 = Clouds found within the radii of globular clusters catalogued by Monella (1985, Coelum, 53, 287), which may affect our estimates of AV (only 1 cloud) 7 = Clouds found in the radii of open clusters catalogued by Dias et al. (2002A&A...389..871D, Cat. B/ocl), which may affect our estimates of AV (48 clouds) 8 = Clouds in M 31 and M 33 (Sect. 6.7) (15 clouds) Note (3): If the clouds found in this work fall within the cloud extents in their catalog, the corresponding cloud numbers are listed in this column. There are 6516 clouds whose counterparts are found in their catalog. Note that the TGU numbers given in this column merely denote the coincidence, which does not ensure a definite physical association.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Aug-2011
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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