VLBI observations of the compact radio source in the center of the Galaxy

Journal Article · Mon Dec 01 04:00:00 EST 1975 · Astrophysical Journal

DOI:https://doi.org/10.1086/181982· OSTI ID:4050371

Lo, K. Y.; Schilizzi, R. T.; Cohen, M. H.; Ross, H. N.

A compact radio source at the galactic center has been detected at 3.7 cm on a very long baseline interferometer composed of the Goldstone 64-m and the Owens Valley 40-m telescopes (separation 252 km). The source has an angular size, theta/subs/, on the order of or less than 0./sub /''02, corresponding to a linear size approximately-less-than200 AU or 10$sup -3$ pc, at the distance of the galactic center (10 kpc). The measured flux density is 0.6+-0.1 Jy. The brightness temperature of the source is 3x10$sup 7$ K if theta/subs/approx. =0./ sub /''02. Comparison with previous high-resolution observations of the galactic center suggests time variation in the flux density. The nature of the compact radio source is discussed. (AIP)

• Research Organization: Owens Valley Radio Observatory, California Institute of Technology
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-024050
• OSTI ID: 4050371
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Vol. 202; ISSN 0004-637X
• Publisher: Institute of Physics (IOP)
• Country of Publication: United States
• Language: English

Related Subjects

*COSMIC RADIO SOURCES-- RADIOWAVE RADIATION
*MILKY WAY-- COSMIC RADIO SOURCES
640103* --Physics Research--Astrophysics & Cosmology--Quasi- Stellar
Radio & X-Ray Sources
BRIGHTNESS
FLUX DENSITY
INTERFEROMETRY
N56300* --Physics (Astrophysics & Cosmology)--Quasi-stellar
Radio & X-Ray Sources
N56500 --Physics (Astrophysics & Cosmology)--Galaxies
RESOLUTION
SIZE
TEMPERATURE DEPENDENCE