A study of the time variation of LSR velocity of recently discovered H2O 616-523 masers

Details A study of the time variation of LSR velocity of recently discovered H2O 616-523 masers A study of the time variation of LSR velocity of recently discovered H2O 616-523 masers

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cha%26a..20..337x&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 20, Issue 3, p. 337-354.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We study the time variation in the LSR velocities of our recently discovered H2O 616-523 masers using the results of three observational runs at yearly intervals with the 43 m and 13.7 m telescopes at Green Bank, USA and Delingha, China. It is found that the masers can be divided into two types. A small majority (Type A) shows alternation of structures, caused by the existence of several unresolved maser knots within the observing beam, with the LSR velocity offset dV restricted by the simple motion of the common exciting source. The rest (Type B) show large velocity differences DV between the epochs, indicating overall motion of the ensemble of knots. Acceleration of the exciting source and the pumping mechanism are involved in the latter type.

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