The position of Sagittarius A* at the galactic center

F. Yusef-Zadeh*, D. Choate, W. Cotton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The 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) = 17h42m29s.3076 ± 0s.0007, -28°59′18″.484 ± 0″.014 or α, δ (2000) = 17h45m40s.0383 ± 0s.0007, -29°00′28″.069 ± 0″.014, which agrees with earlier published values to within the 0″.2 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.

Original languageEnglish (US)
Pages (from-to)L33-L35
JournalAstrophysical Journal
Volume518
Issue number1 PART 2
DOIs
StatePublished - Jun 10 1999

Keywords

  • Galaxies: ISM
  • Galaxy: center
  • ISM: individual (Sagittarius A*)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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