The Bolocam Galactic Plane Survey - Detecting Star-Forming Clumps Across the Galaxy

Details The Bolocam Galactic Plane Survey - Detecting Star-Forming Clumps Across the Galaxy The Bolocam Galactic Plane Survey - Detecting Star-Forming Clumps Across the Galaxy

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535504d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #355.04; Bulletin of the American Astronomical Society, Vol. 42, p.539

Astronomy and Astrophysics

Astronomy

Scientific paper

The Bolocam Galactic Plane Survey (BGPS) has mapped 170 square degrees of the Galactic Plane in 1.1 mm continuum emission and identified 8,358 sources, most of which were previously unknown. We present a general characterization of the type of sources that BGPS is detecting. Without distance, millimeter continuum data alone does not allow for the determination of fundamental source properties such as source size, mass, and density. In order to begin to characterize the BGPS sources, we have conducted a survey of ammonia inversion transitions in a sample of BGPS sources. From the ammonia spectroscopy, we can derive radial velocity, kinematic distance, gas kinetic temperature, mass, and density for each source. In the Gemini OB1 Molecular Cloud, in particular, we find volume-averaged densities on the order of 103 to 104 cm-3,suggesting that the BGPS is detecting the clumps from which stellar clusters form rather than individual cores which form a single star or small multiple system. We have also correlated the GLIMPSE Red Source catalog of Robitaille et al. (2008) with the BGPS catalog to characterize the protostellar content of the BGPS clumps. The ammonia observations and GLIMPSE Red Source catalog can provide a clearer picture of the types of sources BGPS is detecting.

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