A high resolution H I absorption spectrum of SGR A(asterisk)

Details A high resolution H I absorption spectrum of SGR A(asterisk) A high resolution H I absorption spectrum of SGR A(asterisk)

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..245l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 245-248.

Astronomy and Astrophysics

Astronomy

15

Absorption Spectra, Galactic Nuclei, Hydrogen Clouds, Interstellar Gas, Molecular Clouds, Radio Astronomy, Antenna Arrays, High Resolution, Molecular Absorption, Radio Telescopes, Very Large Array (Vla)

Scientific paper

The authors have used the VLA to obtain an H I absorption spectrum of the compact source Sgr A* in the galactic nucleus at an angular resolution of 1arcsec.5. Absorption at 40 - 60 km s-1 is present at an optical depth ≅0.25, as in the earlier, lower-resolution H I data (Liszt et al., 1983). The absence of such gas in the recent H2CO absorption synthesis of Whiteoak et al. (1983) at 3arcsec.5 resolution must therefore be ascribed to peculiarities in the absorbing material and perhaps to the ≅130 times larger solid angle of Sgr A* at λ21 cm. It cannot be due only to a background source geometry in which Sgr A* is physically removed from the thermally-emitting material which appears to surround it.

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