Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..482g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 482-488.
Astronomy and Astrophysics
Astrophysics
32
Extragalactic Radio Sources, H Ii Regions, Interstellar Masers, Radial Velocity, Very Long Base Interferometry, Water Masers, Astronomical Maps, Flux Density, Signal To Noise Ratios, Spiral Galaxies, Star Formation
Scientific paper
A second-epoch spectral line VLBI synthesis map of the H2O maser associated with the H II region IC 133 in the galaxy M33 is presented. Thirty-two spatially distinct maser features were identified, and a second center of maser activity within the IC 133 complex, IC 133 West, which is displaced about 0.3 arcsec from IC 133 Main, was discovered. A comparison of the two available maps of IC 133 is used to estimate the right ascension components of proper motion over a period of 479 d for five maser features to accuracies of between 7 and 16 micro-as. The dispersions in transverse and radial velocities for the maser features are consistent with the accepted distance to M33 of 720 kpc, where the data admit a fractional uncertainty in distance of 50 percent.
Greenhill Lincoln J.
Hirabayashi Hisahi
Menten Karl. M.
Moran James Michael
Reid Mark J.
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