Observational Evidence for a Thick Disk of Dark Molecular Gas in the Outer Galaxy

Michael P. Busch, Philip D. Engelke, Ronald J. Allen +1

We present the serendipitous discovery of an extremely broad ($\Delta V_{LSR}\sim 150$ km/s), faint ($T_{mb}<10\text{mK}$), and ubiquitous 1667 and 1665 MHz ground-state thermal OH…