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New formalhyde masers in Sagittarius B2

1994; IOP Publishing; Volume: 434; Linguagem: Inglês

10.1086/174721

1538-4357

David M. Mehringer, W. M. Goss, Patrick Palmer,

Molecular Spectroscopy and Structure

view Abstract Citations (36) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New Formaldehyde Masers in Sagittarius B2 Mehringer, David M. ; Goss, W. M. ; Palmer, Patrick Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1994 DOI: 10.1086/174721 Bibcode: 1994ApJ...434..237M Keywords: Formaldehyde; Gauss Equation; Interstellar Masers; Interstellar Matter; Sagittarius Constellation; Star Formation; Galactic Evolution; H Ii Regions; Luminosity; Radio Astronomy; Very Large Array (Vla); Astrophysics; ISM: INDIVIDUAL NAME: SAGITTARIUS B2; ISM: MOLECULES; MASERS; RADIO LINES: ISM full text sources ADS | data products SIMBAD (19)