103 citations · 952 across the 53 of their papers we have counts for
54 papers
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 ( km/s), faint (), and ubiquitous 1667 and 1665 MHz ground-state thermal OH…
The Structure of Dark Molecular Gas in the Galaxy -- II. Physical State of "CO-Dark" Gas in the Perseus Arm
Michael P. Busch, Ronald J. Allen, Philip D. Engelke +3
We report the results from a new, highly sensitive (mK) survey for thermal OH emission at 1665 and 1667 MHz over a dense, 9 x 9-pixel grid covering a x p…
OH as an Alternate Tracer for Molecular Gas: Quantity and Structure of Molecular Gas in W5
Philip D. Engelke, Ronald J. Allen
We report column densities of molecular gas in the W5 star-forming region as traced with OH 18-cm emission in a grid survey using the Green Bank Telescope. OH appears to trace a gr…
OH as an Alternate Tracer for Molecular Gas: Excitation Temperatures of the OH 18-cm Main Lines in W5
Philip D. Engelke, Ronald J. Allen
We present excitation temperatures for the OH 18-cm main lines at 1665 and 1667 MHz measured directly in front of the W5 star-forming region, using observations from the G…
The Structure of Dark Molecular Gas in the Galaxy - I: A Pilot Survey for 18-cm OH Emission Towards
Ronald J. Allen, David E. Hogg, Philip D. Engelke
We report the first results from a survey for 1665, 1667, and 1720 MHz OH emission over a small region of the Outer Galaxy centered at . This sp…
Evolution in the Dust Lane Fraction of Edge-on L* Spiral Galaxies since z=0.8
B. W. Holwerda, J. J. Dalcanton, D. Radburn-Smith +5
The presence of a well-defined and narrow dust lane in an edge-on spiral galaxy is the observational signature of a thin and dense molecular disk, in which gravitational collapse h…