The bandmerged Planck Early Release Compact Source Catalogue: Probing sub-structure in the molecular gas at high Galactic latitude
Xi Chen, Ranga-Ram Chary, Timothy J. Pearson, Peregrine McGehee, John, W. Fowler, George Helou

TL;DR
This paper presents a bandmerged catalogue of Planck ERCSC sources, analyzes their spectral energy distributions, and finds evidence of CO emission from molecular gas clumps at high Galactic latitudes.
Contribution
It introduces a novel bandmerging algorithm for Planck sources and provides the first evidence of high-latitude CO emission contributing to the 100 GHz flux.
Findings
Detection of CO emission contributing 4.5% to 100 GHz flux in 147 sources
Identification of molecular gas clumps with total mass exceeding 2000 solar masses
Development of spectral energy distributions across nine Planck frequencies
Abstract
The Planck Early Release Compact Source Catalogue (ERCSC) includes nine lists of highly reliable sources, individually extracted at each of the nine Planck frequency channels. To facilitate the study of the Planck sources, especially their spectral behaviour across the radio/infrared frequencies, we provide a "bandmerged" catalogue of the ERCSC sources. This catalogue consists of 15191 entries, with 79 sources detected in all nine frequency channels of Planck and 6818 sources detected in only one channel. We describe the bandmerging algorithm, including the various steps used to disentangle sources in confused regions. The multi-frequency matching allows us to develop spectral energy distributions of sources between 30 and 857 GHz, in particular across the 100 GHz band, where the energetically important CO J=1->0 line enters the Planck bandpass. We find ~3-5sigma evidence for…
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