Other
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..469g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 15, 1987, p. 469-480.
Other
18
Astronomical Maps, Hydroxyl Emission, Thermal Emission, Broadband, Continuous Radiation, Ground State, Masers, Narrowband, Sagittarius Constellation
Scientific paper
The quasi-thermal emission associated with the 4660- and 4750-MHz transitions of the J = 1/2 excited state of OH has been mapped across Sgr B2 with an angular resolution of 3 arcsec. This emission is concentrated towards portions of the three main continuum complexes, which are disposed along a N-S line. For two of these complexes the emission is more or less consistent with LTE, being considerably stronger at 4750 than at 4660 MHz. However, towards the main complex near 17h44m10s, -28°22arcmin the line emission is anomalous. Not only do the relative peak intensities reverse, but there are velocity shifts between the line profiles for the two transitions. Weak narrow-band 4600-MHz maser emission is located near a 1612-MHz ground-state OH maser, close to a compact continuum component in the main complex. In contrast, the third excited-state transition, at 4765 MHz, is seen as a brighter narrow-band maser located close to a 1720-MHz ground-state maser, towards another compact component 8 arcsec further south.
Gardner Frank F.
Palmer Patrick
Whiteoak John B.
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