Very hot ionized material in Sagittarius B2 F

Details Very hot ionized material in Sagittarius B2 F Very hot ionized material in Sagittarius B2 F

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442l..29m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 442, no. 1, p. L29-L31

Astronomy and Astrophysics

Astronomy

13

Brightness Temperature, H Ii Regions, Ionized Gases, Radio Astronomy, Star Formation, Continuous Spectra, Electron Energy, Radio Observation, Sagittarius Constellation, Very Large Array (Vla)

Scientific paper

Very Large Array (VLA) 20 cm continuum observations (2 sec x 1 sec resolution) of the Sgr B2 star-forming region have been carried out. The peak intensity, which occurs at the location of the Sgr B2 F complex of H II regions, corresponds to a brightness temperature of 23,000 K. The continuum spectrum appears to be thermal; thus the brightness temperature provides a lower limit to the electron temperature. The H66-alpha recombination lines (nu = 22.4 GHz) in this region also suggest that the temperature is high. The Local Thermodynamic Equilibrium (LTE) electron temperature derived from the H66-alpha data is 19,600 K. It is unclear what the heating mechanism is, although a highly nonequilibrium situation which occurs at the edge of the expanding ionization front might be responsible.

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