Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apjs...99..121x&link_type=abstract
Astrophysical Journal Supplement v.99, p.121
Astronomy and Astrophysics
Astronomy
29
Ism: Jets And Outflows, Masers
Scientific paper
We have discovered 17 new H2O masers in searches of known molecular outflows in regions of star formation and have investigated their time variations (see also Xiang & Turner 1992). We have also made extensive surveys of the literature to enumerate all previous H2O masers and outflows and have examined the IRAS Point Source Catalog for IRAS sources toward these objects. Together with the results of a recent survey for molecular outflows in directions of known H2O masers, we are able to assess the success ratio for detections of masers toward known outflows, and for detections of outflows toward known masers. Conclusions about the causal relations between IRAS objects, masers, and outflows are drawn. In particular, we suggest that lifetimes and formation conditions for H2O masers and outflows are similar, or causally related. This is consistent with models of H2O masers in star-forming regions (Elitzur et al. 1989) in which the masers are formed and pumped by gas heated by dissociative shocks, assuming that the shocks are produced by the outflows. Our new information on H2O maser time variations suggests that such variations are unimportant in making these conclusions.
Turner Barry E.
Xiang Delin
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