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

Abstract

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)

Authors:
; ; ;
Publication Date:
Research Org.:
Owens Valley Radio Observatory, California Institute of Technology
Sponsoring Org.:
USDOE
OSTI Identifier:
4050371
NSA Number:
NSA-33-024050
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 202; Other Information: Orig. Receipt Date: 30-JUN-76; Journal ID: ISSN 0004-637X
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
N56300* -Physics (Astrophysics & Cosmology)-Quasi-stellar, Radio & X-Ray Sources; N56500 -Physics (Astrophysics & Cosmology)-Galaxies; 640103* -Physics Research-Astrophysics & Cosmology-Quasi- Stellar, Radio & X-Ray Sources; *COSMIC RADIO SOURCES- RADIOWAVE RADIATION; *MILKY WAY- COSMIC RADIO SOURCES; BRIGHTNESS; FLUX DENSITY; INTERFEROMETRY; RESOLUTION; SIZE; TEMPERATURE DEPENDENCE

Citation Formats

Lo, K. Y., Schilizzi, R. T., Cohen, M. H., and Ross, H. N. VLBI observations of the compact radio source in the center of the Galaxy. United States: N. p., 1975. Web. doi:10.1086/181982.
Lo, K. Y., Schilizzi, R. T., Cohen, M. H., & Ross, H. N. VLBI observations of the compact radio source in the center of the Galaxy. United States. https://doi.org/10.1086/181982
Lo, K. Y., Schilizzi, R. T., Cohen, M. H., and Ross, H. N. 1975. "VLBI observations of the compact radio source in the center of the Galaxy". United States. https://doi.org/10.1086/181982.
@article{osti_4050371,
title = {VLBI observations of the compact radio source in the center of the Galaxy},
author = {Lo, K. Y. and Schilizzi, R. T. and Cohen, M. H. and Ross, H. N.},
abstractNote = {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)},
doi = {10.1086/181982},
url = {https://www.osti.gov/biblio/4050371}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = ,
volume = 202,
place = {United States},
year = {Mon Dec 01 00:00:00 EST 1975},
month = {Mon Dec 01 00:00:00 EST 1975}
}