Proper motion of the compact, nonthermal radio source in the galactic center

Details Proper motion of the compact, nonthermal radio source in the galactic center Proper motion of the compact, nonthermal radio source in the galactic center

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aipc..155..163b&link_type=abstract

AIP Conference Proceedings, Volume 155, pp. 163-165 (1987).

Computer Science

29

Black Holes

Scientific paper

Observations with the VLA for four epochs from 1981 to 1985 have resulted in the first two-axis measurement of the proper motion of the compact, nonthermal radio source in the galactic eenter, Sgr A*. This result considerably improves our past single-axis measurement (Backer and Sramek 1982). The observed motion is consistent with that expected for an object in the galactic center whose peculiar velocity is no larger than 40 r km s-1, where r is the distance to the galactic center in units of 8.5 kpc. If there is a massive black hole in the galactic center, then these observations suggest that the radio emission must be coming from a synchrotron corona surrounding the hole. The converse is not true: these observations, by themselves and at their present level of accuracy, do not require the existence of a massive black hole.

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