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Optically Thick [O I] and [C II] Emission Towards NGC 6334 A
N. P. Abel, A. P. Sarma, T. H. Troland +1
This work focuses on [O I] and [C II] emission towards NGC 6334 A, an embedded H+ region/PDR only observable at infrared or longer wavelengths. A geometry where nearly all the emis…
A Magnetically-Supported Photodissociation Region in M17
E. W. Pellegrini, J. A. Baldwin, C. L. Brogan +6
The southwestern (SW) part of the Galactic H II region M17 contains an obscured ionization front that is most easily seen at infrared and radio wavelengths. It is nearly edge-on, t…
Sensitive VLBI Studies of the OH Megamaser Emission from IRAS 17208-0014
E. Momjian, J. D. Romney, C. L. Carilli +1
We present phase-referenced VLBI results on the radio continuum and the OH 18 cm megamaser emission from the Ultra-Luminous Infrared Galaxy, IRAS 17208--0014. The observations were…
Physical Conditoins in Orion's Veil II: A Multi-Component Study of the Line of Sight Toward the Trapezium
N. P. Abel, G. J. Ferland, C. R. O'Dell +2
Orion's Veil is an absorbing screen that lies along the line of sight to the Orion H II region. It consists of two or more layers of gas that must lie within a few parsecs of the T…
The Millennium Arecibo 21-cm Absorption Line Survey. IV. Statistics of Magnetic Field, Column Density, and Turbulence
Carl Heiles, T. H. Troland
We discuss observations of the magnetic field, column density, and turbulence in the Cold Neutral Medium (CNM). The observed quantities are only indirectly related to the intrinsic…
Physical Conditions in Orion's Veil
N. P. Abel, C. L. Brogan, G. J. Ferland +3
Orion's veil consists of several layers of largely neutral gas lying between us and the main ionizing stars of the Orion nebula. It is visible in 21cm H I absorption and in optical…