Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adil...dm...04m&link_type=abstract
NCSA Astronomy Digital Image Library
Astronomy and Astrophysics
Astronomy
H Ii Regions, Hydroxyl Emission, Interstellar Masers, O Stars, Sagittarius Constellation, Star Formation, Water Masers
Scientific paper
High sensitivity searches for OH and H2O masers in the evolved Galactic center star forming region Sgr B1 show one site of OH activity and at least 10 centers of H2O activity. The presence of masers indicates that though this region may be evolved, stars are continuing to form. The center of OH activity corresponds to a center of H2O activity, and is also the location of a radio continuum source that has a diameter < 0.02 pc. This region is probably an ultracompact H II region, although the possibility of it being an evolved star cannot be excluded. Such compact radio continuum sources with masers are commonly found in star forming regions. In contrast, the remaining sites of H2O maser activity are not associated with compact continuum sources. Some are projected onto the extended ionized gas and there is no continuum emission in the direction of the others. It is unlikely that all of these masers are associated with evolved stars because of the absence of OH maser emission and because the surface density of these masers is three times greater than that of evolved stars that have associated masers. Therefore, most of the H2O masers in Sgr B1 are probably located near sites of formation of intermediate or low mass stars. Such a relationship between H2O masers and low mass star formation has been observed in nearby molecular clouds. This study shows that H2O masers can be used as tools in the investigation of intermediate and/or low mass star formation for regions near the Galactic center.
Goss William Miller
Mehringer David Michael
Palmer Patrick
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