Some old and new facts about the Local Group of galaxies and the extragalactic distance scale

Details Some old and new facts about the Local Group of galaxies and the extragalactic distance scale Some old and new facts about the Local Group of galaxies and the extragalactic distance scale

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..35...17r&link_type=abstract

ESO Messenger (ISSN 0722-6691), March 1984, p. 17-20.

Astronomy and Astrophysics

Astronomy

2

Astrometry, Distance, Local Group (Astronomy), H Lines, Reference Stars

Scientific paper

The study of the sun's galactic neighbors allows the determination of global parameters and composition with the highest possible observational accuracy. Absolute parameters are dependent on exact knowledge of distances to galaxies, however, and the implicit requirement for objects having a small dispersion in intrinsic physical properties is a subject of controversy among contemporary astronomers. Only recently has H I data become complete for the spiral and irregular galaxies in the Local Group, allowing the invocation of the Tully-Fisher relation as an aid to reliable distance indication. Other indicators are the Sandage-Tammann, the deVaucouleurs, and that of type I supernovae.

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