F. Yusef-Zadeh et al 1999 ApJ 518 L33 doi:10.1086/312058
The Position of Sagittarius A* at the Galactic Center
FREEF. Yusef-Zadeh1, D. Choate1 and W. Cotton2
Show affiliationsThe absolute position of the compact radio source at the dynamical center of the Galaxy, Sagittarius A*, was known only to an accuracy of 0
2 in spite of its accurate location with respect to near-IR stellar sources to within 30 mas. To remedy this poor positional accuracy, we have selected 15 high-resolution, high-frequency VLA observations of Sgr A* carried out in the last 13 years and determined the weighted average position with the average epoch 1992.4 to be at α, δ(1950) = 17h42m29.s3076±0.s0007, -28°59(2000) = 17h45m40.s0383±0.s0007, -29°00'28069±0014, which agrees with earlier published values to within the 02 error bars of the earlier measurements. An accurate absolute position of Sgr A* can be useful for its identification with sources at other wavelengths, particularly in soft and hard X-rays, with implications for the models of a massive black hole at the Galactic center.
- Subject headings
galaxies: ISM; Galaxy: center; ISM: individual (Sagittarius A*)
- Dates
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Issue 1 (1999 June 10)
Received 1999 February 9, accepted for publication 1999 April 7
Published 1999 May 19
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The Position of Sagittarius A* at the Galactic Center
F. Yusef-Zadeh et al 1999 ApJ 518 L33
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