H110 alpha observations of Sagittarius A West: Ionized gas at peculiar velocities at the galactic center

Details H110 alpha observations of Sagittarius A West: Ionized gas at peculiar velocities at the galactic center H110 alpha observations of Sagittarius A West: Ionized gas at peculiar velocities at the galactic center

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442..646y&link_type=abstract

Astrophysical Journal (ISSN 0004-637X), vol. 442, no. 2, Part 1, p. 646-652

Astronomy and Astrophysics

Astronomy

11

Interstellar Gas, Ionized Gases, Line Spectra, Milky Way Galaxy, Molecular Clouds, Radio Astronomy, Radio Emission, Sagittarius Constellation, Velocity Measurement, Data Reduction, Radio Observation, Radio Spectra, Red Shift, Ultraviolet Radiation, Very Large Array (Vla)

Scientific paper

We present Very Large Array measurements of H110 alpha radio recombination line emission from Sgr A West with a resolution of 11 x 20 arcsec. These observations detected a number of new kinematic components showing a dramatically different velocity field than expected from circular motion of ionized gas in Sgr A West about the dynamical center of the Galaxy. Recent high-resolution molecular observations show a cloud of absorbing gas at -180 km/s within 30 arcsec of the Galactic center. We find evidence of an ionized counterpart to this highly blueshifted molecular gas. This result places this highly blueshifted neutral gas in a hot UV dominated environment of the Galactic center. We suggest that the blueshifted clouds are photoionized externally by the intense UV radiation field at the Galactic center. We also detect H110 alpha emission from large-scale linear features known as the 'streamers', which run primarily perpendicular to the Galactic plane and lie exterior to the 'three-arm' spiral structure of Sgr A West and the circumstellar disk. These observations support an earlier suggestion that the streamers are thermal features whose kniematics deviate from circular motion.

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