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

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

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..618w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 15, 1984, p. 618-628.

Astronomy and Astrophysics

Astrophysics

39

Astronomical Spectroscopy, Hydrogen Clouds, Hyperfine Structure, Interstellar Masers, Water Masers, Mean Square Values, Position (Location), Spatial Distribution, Statistical Analysis, Velocity Distribution

Scientific paper

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.

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