The distance to the center of the galaxy: H2O maser proper motions in SGR B2(N)

Details The distance to the center of the galaxy: H2O maser proper motions in SGR B2(N) The distance to the center of the galaxy: H2O maser proper motions in SGR B2(N)

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8823702r&link_type=abstract

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Physics

Distance, Galactic Nuclei, Interstellar Masers, Milky Way Galaxy, Water Masers, Star Formation, Stellar Motions, Very Long Base Interferometry

Scientific paper

The proper motions of H2O maser spots associated with the star forming region Sgr B2(N), which lies close to the galactic center were measured via 5 VLBI observations spanning 1.5 yr. Relative positional accuracies are 20 micro as across a 4 arcsec field, yielding relative transverse velocities with uncertainties of a few km/sec. The proper motion information shows that the dominant motions of the Sgr B2(N) masers are expansion, with evidence for rotation. The source is modeled as an expanding (and rotating) flow. Parameters including the source distance, the expansion center, and the expansion and rotation velocities were estimated by fitting the kinematic data in a least-squares sense. The expansion velocity is 45 km/sec suggesting that the outflow in Sgr B2(N) is more energetic than the outflow associated with IRc 2 in Orion. The rotation velocity at a radial distance of 1 arcsec is 20 km/sec, indicating a mass enclosed by the 2 arcsec masing region of 20,000 solar mass. The distance to the Sgr B2(N) H2O masers, and hence the distance to the galactic center is 7.1 kpc with a 1 standard-deviation uncertainty, including systematic sources of error, of 1.5 kpc.

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