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Title: Ionized gas in the Sgr A complex -- VLA observations of H168α and H270α recombination lines
Authors: Anantharamaiah, K.R.
Pedlar, A.
Goss, W.M.
Issue Date: 1999
Publisher: Astronomical Society of the Pacific
Citation: ASP Conference Series, 1999, Vol.186, p422
Abstract: Radio recombination lines at λ = 20 cm reveal the presence of an extended component of ionized gas of lower density (~100 cm3) in the Sgr A complex. This component extends well beyond the thermal `mini-spiral' Sgr A-West which seem to be embedded in it. The low-density component is present over the entire extent of Sgr A East and possibly beyond and it is responsible for the turnover in the spectrum of Sgr A East and the halo observed by Pedlar et al (1989) at λ = 90 cm. The radial velocity of the extended ionized gas ranges from +50 kms- to --200 kms- with minima of emission near --50 and --150 kms. The total mass of the low-density component is estimated to be ~104 Modot. A possible extended feature at a high velocity of 470 kms- is also detected, but needs further observations to confirm it.
Description: Restricted Access. An open-access version is available at (one of the alternative locations).
ISBN: 1-58381-012-9
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Copyright: The Central Parsecs of the Galaxy, ASP Conference Series, Vol. 186. Eds. Heino Falcke, Angela Cotera, Wolfgang J. Duschl, Fulvio Melia, and Marcia J. Rieke, 1999.
Additional information: 1999 Astronomical Society of the Pacific
Appears in Collections:Research Papers (A&A)

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