Outer galaxy molecular cloud catalog (Brunt+, 2003)

Details Outer galaxy molecular cloud catalog (Brunt+, 2003) Outer galaxy molecular cloud catalog (Brunt+, 2003)

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ycat..21440047b&link_type=abstract

VizieR On-line Data Catalog: J/ApJS/144/47. Originally published in: 2003ApJS..144...47B

Astronomy and Astrophysics

Astronomy

Interstellar Medium, Molecular Clouds, Radio Lines, Morphology

Scientific paper

The Five College Radio Astronomy Observatory (FCRAO) Outer Galaxy Survey (OGS) of 12CO(J=1-0) emission was carried out between 1994May and 1997September, using the FCRAO focal plane array QUARRY (Erickson et al. 1992, IEEE Trans. 40, 1), and initially described by Heyer et al. (1998ApJS..115..241H). The OGS covers the Galactic area 102.5The catalog was generated in a two-phase object identification procedure. The first phase consists of grouping pixels into contiguous structures above a radiation temperature threshold of 0.8K; the second phase decomposes the first-phase objects by an enhanced version of the CLUMPFIND algorithm, using dynamic thresholding, and again with a threshold of 0.8K used for discrimination.
Basic attributes of the clouds (coordinates, bounding boxes, integrated intensities, peak observed temperatures) are tabulated in the catalog. A two-dimensional elliptical Gaussian is fitted to the velocity- integrated map of each cloud; the major and minor axis sizes and major axis position angles thus derived are included in the catalog. To the spatially integrated emission line of each cloud, a Gaussian profile is fitted to measure the global linewidth. Model Gaussian clouds, truncated at 0.8K, are examined to determine the effects of biases on measured quantities, induced by truncation. Coupled with detailed analysis of the catalogued clouds, statistical corrections for the effects of truncation on measured sizes, linewidths, and integrated intensities are derived and applied, along with corrections for the effects of finite resolution on the measured attributes. The catalogued emission accounts for 76.4% of the total emission in the Outer Galaxy Survey. The deficit is shown to arise mainly from low-intensity emission on the periphery of larger objects, rather than from a large number of small and/or low-intensity features.
(1 data file).

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