Query : 2012A&A...542A..61B

2012A&A...542A..61B - Astronomy and Astrophysics, volume 542A, 61-61 (2012/6-1)

Leo IV and V - a possible dwarf galaxy pair?


Abstract (from CDS):

The last few years have seen the discovery of many faint and ultra-faint dwarf spheroidal galaxies around the Milky Way. Among these is a pair of satellites called Leo IV and Leo V. This pair is found at large distances from the Milky Way (154 and 175kpc, respectively). The fairly small difference in radial distance, and the fact that they also show a close projected distance on the sky, has led to the idea that we might be seeing a new pair of bound galaxies - like the Magellanic Clouds. In this paper we investigate this speculation by means of a simple integration code (confirming the results with full N-body simulations). Because the luminous mass of the two faint dwarfs is far too low to allow them to be bound, we simulate the pair assuming extended dark matter haloes. Our results show that the minimum dark matter mass required for the pair to be bound is quite high - ranging from 1.6x1010M to 5.4x1010M (within the virial radii). Computing the mass of dark matter within a commonly adopted radius of 300pc shows that our models are well within the predicted range of dark matter content for satellites so faint. We therefore conclude that it could be possible that the two galaxies constitute a bound pair.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: individual: Leo IV - galaxies: halos - methods: numerical - galaxies: individual: Leo V

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6825 1
2 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 368 0
3 NAME Leo V G 11 31 09.60 +02 13 12.0     16.0     ~ 194 0
4 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 371 1
5 NAME Local Group GrG ~ ~           ~ 8149 0

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