ADS Astronomy Abstract Service

Title:		The Fornax-Leo-Sculptor stream revisited
Authors:		MAJEWSKI, STEVEN R.
Affiliation:		AAThe Observ. of the Carnegie Inst. of Washington, Pasadena, CA, US
Journal:		The Astrophysical Journal, Part 2 - Letters, vol. 431, no. 1, p. L17-L21
Publication Date:		08/1994
Category:		Astrophysics
Origin:		STI
NASA/STI Keywords:		DWARF GALAXIES, GALACTIC EVOLUTION, GALACTIC HALOS, GLOBULAR CLUSTERS, HORIZONTAL BRANCH STARS, MAGELLANIC CLOUDS, METALLICITY, MILKY WAY GALAXY, RADIAL VELOCITY
Bibliographic Code:		1994ApJ...431L..17M

Abstract

Lynden-Bell first demonstrated that the satellites of the Milky Way appear situated along two great 'streams' in the sky: the 'Magellanic stream' and the 'Fornax-Leo-Sculptor (FLS) stream.' Further exploration of the three-dimensional distribution of Galactic satellites reveals that the recently discovered Sextans and Phoenix dwarf spheroidal galaxies also lie near the plane defined by the FLS galaxies, and therefore strengthens the evidence in favor of the FLS stream. Moreover, a specific group of globular clusters -- those exhibiting the reddest horizontal branches (HBs) among those identified as 'young halo' by Zinn -- appear to populate the FLS stream. As previously demonstrated by Zinn, the spatial distribution of old halo globulars appears to be flattened toward the Galactic plane, and therefore the old halo clusters are typically anti-correlated to the nearly orthogonal FLS stream. A scenario is postulated wherein the Galactic satellites of the FLS stream and the red HB, young halo globular clusters share a common origin in the accretion of a formerly larger, parent satellite galaxy or Searle & Zinn 'fragment.'