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J/ApJS/182/131 Molecular clouds and clumps in the GRS (Rathborne+, 2009)
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Beginning of ReadMe :J/ApJS/182/131 Molecular clouds and clumps in the GRS (Rathborne+, 2009)
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Molecular clouds and clumps in the Boston University-Five College Radio
Astronomy Observatory Galactic Ring Survey.
Rathborne J.M., Johnson A.M., Jackson J.M., Shah R.Y., Simon R.
<Astrophys. J. Suppl. Ser., 182, 131-142 (2009)>
=2009ApJS..182..131R
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ADC_Keywords: Molecular clouds ; Surveys ; Carbon monoxide
Keywords: catalogs - Galaxy: kinematics and dynamics - ISM: clouds
ISM: molecules - molecular data
Abstract:
The Boston University-Five College Radio Astronomy Observatory
(BU-FCRAO) Galactic Ring Survey (GRS) of ^13^CO J=1->0 emission
covers Galactic longitudes 18<l<55.7deg and Galactic latitudes
|b|<=1deg. Using the SEQUOIA array on the FCRAO 14m telescope, the
GRS fully sampled the ^13^CO Galactic emission (46" angular resolution
on a 22" grid) and achieved a spectral resolution of 0.21km/s. Because
the GRS uses ^13^CO, an optically thin tracer, rather than ^12^CO, an
optically thick tracer, the GRS allows a much better determination of
column density and also a cleaner separation of velocity components
along a line of sight. With this homogeneous, fully sampled survey of
^13^CO emission, we have identified 829 molecular clouds and 6124
clumps throughout the inner Galaxy using the CLUMPFIND algorithm.
Here we present details of the catalog and a preliminary analysis of
the properties of the molecular clouds and their clumps. Moreover,
we compare clouds inside and outside of the 5kpc ring and find that
clouds within the ring typically have warmer temperatures, higher
column densities, larger areas, and more clumps compared with clouds
located outside the ring. This is expected if these clouds are
actively forming stars. This catalog provides a useful tool for the
study of molecular clouds and their embedded young stellar objects.
Description:
The survey comprises a total of 1993522 spectra. The data are
available to the community at www.bu.edu/galacticring. For more
details of the telescope and instrumental parameters, see Jackson et
al., 2006ApJS..163..145J.