H2O in W49N. II - Statistical studies of hyperfine structure, clustering, and velocity distributions

Abstract

view Abstract Citations (46) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS H2O in W 49N. II. Statistical studies of hyperfine structure, clustering and velocity distributions. Walker, R. C. Abstract A statistical analysis of the relative positions and velocities of H2O masers in W49N is described. The distribution of relative velocities of spatially close pairs of features shows that the hyperfine structure is probably present. Two-point correlation functions show that there is strong clustering of features, but that, if all masers are included, there is no characteristic scale size for clusters. However, if only pairs of features with similar velocities are analyzed, characteristic projected sizes on the order of 5 x 10 to the 15th cm emerge. This is especially true for the low-velocity features. This size may correspond to individual dense clouds. An analysis of the rms velocity difference as a function of separation shows the velocity spread in the low-velocity clusters is about 10 km/s and independent of separation. For the high-velocity features, there is a strong separation dependence (proportional to separation to the 2/3 power) at distances below 5 x 10 to the 15th cm. Publication: The Astrophysical Journal Pub Date: May 1984 DOI: 10.1086/162035 Bibcode: 1984ApJ...280..618W Keywords: Astronomical Spectroscopy; Hydrogen Clouds; Hyperfine Structure; Interstellar Masers; Water Masers; Mean Square Values; Position (Location); Spatial Distribution; Statistical Analysis; Velocity Distribution; Astrophysics full text sources ADS | data products SIMBAD (1)