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Astron. Astrophys. 322, 86-88 (1997)

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Research Note

The orientation of warps in the Local Group

A. Zurita 1, 2 and E. Battaner 1

1 Departamento de Fisica Teórica y del Cosmos, Facultad de Ciencias, Universidad de Granada, E-18002 Granada, Spain
2 Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain

Received 25 September 1996 / Accepted 20 November 1996


The three major spiral galaxies in the Local Group are known to be warped. The question is investigated of whether or not these three warps are aligned. Using available HI observations we find that they are noticeably aligned. Vectors defining the warp orientation form the following angles: [M 31, M 33]= [FORMULA] ; [M 31, Milky Way]= [FORMULA] ; [M 33, Milky Way]= [FORMULA]. The alignment of the directions of the warp lines of nodes is lower even though also noticeable.

Key words: Galaxy: structure – galaxies: M 31; M 33 – galaxies: structure

Send offprint requests to: E. Battaner

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998