Physical structure of H2O masers in W49N J/ApJ/429/253 J/ApJ/429/253 W49N H2O masers Physical structure of H2O masers in W49N C R Gwinn Astrophys. J. 429 253 1994 1994ApJ...429..253G Masers Radio lines VLBI ISM: individual (W49) ISM: jets and outflows ISM: kinematics and dynamics ISM: molecules masers VLBI observations of a H2O maser were done at five epochs in 1980-82 with a 5 station VLBI network (see 1992ApJ...393..149G). A model was fitted to each peak in any spectral channel exceeding 5 times the rms background. The minimum level of this background, due to system noise at the antennas, was about 0.2Jy at each epoch. The model parameters include right ascension and declination offset (x, y) relative to a reference position; the total flux density, S; and the angular diameter {theta}_H_, of the best-fitting Gaussian distribution of intensity. The fitted parameters are in table1.
W 49N19 10 13.1+09 06 12
 Features observed 1982 March 6 [G94] Sequential number --- oRA Right ascension offset from a reference position mas oDE Declination offset from a reference position mas Vz Doppler velocity km/s DVz Line width km/s Sp Peak flux density Jy Theta Angular size mas James Marcout, Patricia Bauer, CDS 1996Aug09 UNKNOWN UNKNOWN Scanned and processed via OCR at CDS. J_ApJ_429_253.xml