Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..237m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 1, p. 237-243
Astronomy and Astrophysics
Astronomy
24
Formaldehyde, Gauss Equation, Interstellar Masers, Interstellar Matter, Sagittarius Constellation, Star Formation, Galactic Evolution, H Ii Regions, Luminosity, Radio Astronomy, Very Large Array (Vla)
Scientific paper
In 1983, J. Whiteoak and F. Gardner discovered five 6 cm H2CO (formaldehyde) masers in Sagittarius (Sgr) B2 using the Very Large Array (VLA). A recent more sensitive observation in 1993 has detected four new H2CO masers. Six masers are located near continuum sources, while the other three located greater than 4 sec (0.1 pc) from H II regions. OH masters are located within 8 sec (0.3 pc) of seven H2CO masers, and it is argued that the H2CO masers are intermingled among other molecular masers. (OH, H2O and CH3OH) marking regions of star formation. One source has an angular size of 1.2 sec x 0.7 sec, suggesting that multiple components are blended in the beam. This source is probably located in an outflow of warm and dense molecular material. Time variability on a 10 yr scale is six of the nine H2CO masers in Sgr B2.
Goss William Miller
Mehringer David Michael
Palmer Patrick
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