Observational Evidence for a Thick Disk of Dark Molecular Gas in the Outer Galaxy
Michael P. Busch,
Philip D. Engelke,
Ronald J. Allen
et al.
Abstract:We present the serendipitous discovery of an extremely broad (∆V LSR ∼ 150 km s −1 ), faint (T mb < 10mK), and ubiquitous 1667 and 1665 MHz ground-state thermal OH emission towards the 2nd quadrant of the outer Galaxy (R gal > 8 kpc) with the Green Bank Telescope. Originally discovered in 2015, we describe the redundant experimental, observational, and data quality tests of this result over the last five years. The longitude-velocity distribution of the emission unambiguously suggests large-scale Galactic stru… Show more
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