A transient radio source near the center of the Milky Way Galaxy

Details A transient radio source near the center of the Milky Way Galaxy A transient radio source near the center of the Milky Way Galaxy

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...255.1538z&link_type=abstract

Science (ISSN 0036-8075), vol. 255, March 20, 1992, p. 1538-1543.

Astronomy and Astrophysics

Astronomy

36

Galactic Nuclei, Infrared Imagery, Milky Way Galaxy, Molecular Clouds, Radio Sources (Astronomy), Very Large Array (Vla), Absorption Spectra, Hydrogen, Hydroxyl Radicals, Molecular Absorption, Radio Emission, Synchrotron Radiation, X Ray Binaries

Scientific paper

A new high-intensity radio source that appeared in late December 1990 near the center of the Galaxy is described. Following its first detection, the flux density of this Galactic-center transient (GCT) increased rapidly to a maximum a month later, and then declined gradually during the next 3 months. However, throughout its rising and decay phases, the GCT maintained a steep radio spectrum. Neutral-hydrogen-absorption and OH observations indicate that the GCT is either embedded in, or located behind, a molecular cloud moving with the velocity of +20 km/sec with respect to the local standard of rest. It is suggested that the GCT represents a transient radio emission from synchrotron-radiating plasma associated with an X-ray binary system.

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