The Flux Distribution of 1.1 mm Dense Cores in the Bolocam Galactic Plane Survey

Details The Flux Distribution of 1.1 mm Dense Cores in the Bolocam Galactic Plane Survey The Flux Distribution of 1.1 mm Dense Cores in the Bolocam Galactic Plane Survey

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0704b&link_type=abstract

American Astronomical Society, AAS Meeting #212, #7.04; Bulletin of the American Astronomical Society, Vol. 40, p.198

Astronomy and Astrophysics

Astronomy

Scientific paper

The Bolocam Galactic Plane Survey (BGPS) has detected 10,000 dense cores covering 150 square degrees of the Northern Galactic plane between longitude = -10 and +189. BGPS cores trace dense material most directly associated with on-going star formation. At millimeter wavelengths, the flux from these cores is optically thin and in the Rayleigh-Jeans limit. Thus, the core mass is proportional to the observed flux, dust temperature, core projected area, and square of the distance. At the 30” resolution of BGPS, the majority of cores are unresolved making the distribution of peak and area-integrated fluxes similar. Without any consideration of the distance to the BGPS cores, the flux distribution above the completeness limit of about 0.3 Jy can be described by a power law of the form dN/dF = kF-α. Preliminary results show that the best fit power law index for BGPS cores is similar to the mass spectrum found for giant molecular clouds (GMC) in Galactic plane surveys using CO as a tracer. This is surprising because temperature and distance variations were not taken into account in this analysis. The similarity of BGPS and GMCs power-law indices may be caused by several factors: 1) Since the majority of BGPS cores are located in the Molecular Ring, the preliminary results are dominated by BGPS cores at similar temperatures and distances (about 5 to 8 kpc), 2) The underlying mass spectrum, temperature, and distance distribution conspire to produce a similar index despite an intrinsic difference, 3) The clustering properties of BGPS cores and GMCs conspire to produce this index due to the individual cores within a cluster not being spatially resolved. Future observations that incorporate measurements of NH3 as a tracer may be used to constrain temperatures and distances to BGPS cores, enabling the determination of basic core parameters.

Affiliated with

Also associated with

No associations

Rating

The Flux Distribution of 1.1 mm Dense Cores in the Bolocam Galactic Plane Survey does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Flux Distribution of 1.1 mm Dense Cores in the Bolocam Galactic Plane Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Flux Distribution of 1.1 mm Dense Cores in the Bolocam Galactic Plane Survey will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1394425