Atlas and Catalog of Dark Clouds Based on Digitized Sky Survey I
We introduce our quantitative atlas and catalog of dark clouds derived by using the optical database "Digitized Sky Survey I”. Applying a traditional starcount technique to 1043 plates contained in the database, we produced an A V map covering the entire region in the galactic latitude range |b| ≤ 40°. Based on the A V map drawn at the two different angular resolutions 6′ and 18′, we identified 2448 dark clouds and 2840 clumps located inside them. Some 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 AVmap and a list of the identified clouds and clumps were summarized as an atlas and catalog of dark clouds. Printed version of the data is already published in a special issue of the Publications of the Astronomical Society of Japan (Dobashi et al. 2005, PASJ, Vol. 57, No. SP1, pp. S1-S386). Digital version of the data, i.e., a FITS file for the AVmap and an ASCII file for the catalog, is also available at URL http://astro.u-gakugei.ac.jp/~tenmon/Atlas/index.html.
KeywordsAngular Resolution Galactic Plane Astronomical Society Galactic Latitude Dark Cloud
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