Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366l..15r&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 1, 1991, p. L15-L18.
Astronomy and Astrophysics
Astronomy
27
Galactic Nuclei, Radio Sources (Astronomy), Very Large Array (Vla), Astronomical Spectroscopy, Electron Energy, Interstellar Magnetic Fields, Radio Spectra, Sagittarius Constellation, Zeeman Effect
Scientific paper
With a resolution of 2.4 arcsec and an rms noise of 0.4 mJy/beam, the northern arm and bar of Sagittarius A (Sgr A) West have been observed in the H92-alpha radio recombination line (RRL) at 8.3 GHz, using the Very Large Array (VLA). Zeeman observations of several positions in the northern arm have yielded upper limits of 15 mG (3 sigma) for the line-of-sight magnetic field. In the bar region within 30 arcsec of Sgr A asterisk, the increase in electron temperature suggested by van Gorkom et al. (1985), has been confirmed. Values of the electron temperature in the range 20,000-40,000 K are observed. The H92-alpha spectra have similar shapes to those of (Ne II) at 12.8 microns; thus, pressure broadening is not important in influencing the line widths of these high-frequency recombination lines.
Goss William Miller
Leahy Patrick J.
Roberts Daniel A.
van Gorkom Jacqueline H.
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