The distance to the center of the Galaxy - H2O maser proper motions in Sagittarius B2(N)

Details The distance to the center of the Galaxy - H2O maser proper motions in Sagittarius B2(N) The distance to the center of the Galaxy - H2O maser proper motions in Sagittarius B2(N)

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..809r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 809-816.

Astronomy and Astrophysics

Astrophysics

157

Astrometry, Galactic Nuclei, Milky Way Galaxy, Stellar Motions, Water Masers, Distance, Maser Outputs, Power Spectra, Star Formation, Very Long Base Interferometry

Scientific paper

The authors measured the proper motions of many H2O maser spots associated with the star-forming region, Sgr B2(N), which lies close to the Galactic Center. They used five VLBI observations spanning 1.5 yr and achieved relative positional accuracies of about 20 microarcseconds (μas) across a 4arcsec field. The proper motion information shows that the dominant motions of the Sgr B2(N) masers are expansion, with evidence for some rotation. The expansion velocity is ≡45 km s-1. The rotation velocity at a radial distance of 1arcsec is ≡20 km s-1, indicating a mass enclosed by the 2arcsec masing region of ≡2×104M_sun;. The authors find the distance to the Sgr B2(N) H2O masers, and hence the distance to the Galactic Center (R0), to be 7.1 kpc with a one standard deviation uncertainty, including systematic sources of error, of 1.5 kpc.

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