Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..124s&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 124-133. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
87
Gas Flow, Interstellar Gas, Interstellar Masers, Molecular Clouds, Supersonic Flow, Water Masers, Emission Spectra, H Ii Regions, Molecular Gases, Nebulae, Stellar Evolution, Very Long Base Interferometry
Scientific paper
Accurate relative positions of the W51NORTH masers, determined by VLBI observations of the water vapor maser emission at 22 GHz, show changes of a few milli-arcsec over a two-year period. These displacements are interpreted as the result of transverse motions of about 50 km/sec, comparable with the radial velocity dispersion for this source, which are not random and show that clusters of maser features travel as a unit. The members of the maser cluster seem to be embedded in cloudlets of molecular gas having a scale size of 5 x 10 to the 14th cm. B-alpha observations made to establish the ambient velocity of the W51 region show that the ambient LSR velocity of the H II region is consistent with the molecular cloud velocity of about 56 km/sec. The distance to W51NORTH is estimated to be 8.3 + or - 2.5 kpc.
Downes Dennis
Genzel Reinhard
Lane Adair P.
Moran James Michael
Reid Mark J.
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