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Astron. Astrophys. 349, 7-10 (1999)


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HI observations towards the Sagittarius dwarf spheroidal galaxy

W.B. Burton 1 and Felix J. Lockman 2

1 Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, The Netherlands (burton@strw.leidenuniv.nl)
2 National Radio Astronomy Observatory, P.O. Box 2, Green Bank WV 24944, USA (jlockman@nrao.edu)

Received 22 April 1999 / Accepted 21 July 1999

Abstract

We have measured the [FORMULA]21 cm line of Galactic H I over more than 50 square degrees in the direction of the Sagittarius dwarf spheroidal galaxy. The data show no evidence of H I associated with the dwarf spheroidal which might be consider analogous to the Magellanic Stream as it is associated in both position and velocity with the Large Magellanic Cloud. Nor do the H I data show evidence for any disturbance in the Milky Way disk gas that can be unambiguously assigned to interaction with the dwarf galaxy. The data shown here limit the H I mass at the velocity of the Sagittarius dwarf to [FORMULA] [FORMULA] over some 18 square degrees between Galactic latitudes [FORMULA] and [FORMULA].

Key words: ISM: kinematics and dynamics – galaxies: dwarf – galaxies: individual: Sgr dwarf spheroidal – galaxies: interactions – galaxies: ISM

Send offprint requests to: W.B. Burton or F.J. Lockman

© European Southern Observatory (ESO) 1999

Online publication: August 25, 1999

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