THE BOLOCAM GALACTIC PLANE SURVEY. IX. DATA RELEASE 2 AND OUTER GALAXY EXTENSION

Abstract

We present a re-reduction and expansion of the Bolocam Galactic Plane Survey,\nfirst presented by Aguirre et al. (2011) and Rosolowsky et al. (2010). The BGPS\nis a 1.1 mm survey of dust emission in the Northern galactic plane, covering\nlongitudes -10 < \\ell < 90 and latitudes |b| < 0.5 with a typical 1-\\sigma RMS\nsensitivity of 30-100 mJy in a 33" beam. Version 2 of the survey includes an\nadditional 20 square degrees of coverage in the 3rd and 4th quadrants and 2\nsquare degrees in the 1st quadrant. The new data release has improved angular\nrecovery, with complete recovery out to 80" and partial recovery to 300", and\nreduced negative bowls around bright sources resulting from the atmospheric\nsubtraction process. We resolve the factor of 1.5 flux calibration offset\nbetween the v1.0 data release and other data sets and determine that there is\nno offset between v2.0 and other data sets. The v2.0 pointing accuracy is\ntested against other surveys and demonstrated to be accurate and an improvement\nover v1.0. We present simulations and tests of the pipeline and its properties,\nincluding measurements of the pipeline's angular transfer function. The Bolocat\ncataloging tool was used to extract a new catalog, which includes 8594 sources,\nwith 591 in the expanded regions. We have demonstrated that the Bolocat 40" and\n80" apertures are accurate even in the presence of strong extended background\nemission. The number of sources is lower than in v1.0, but the amount of flux\nand area included in identified sources is larger.\n