Query : 2012A&A...546L...7M

2012A&A...546L...7M - Astronomy and Astrophysics, volume 546, L7-7 (2012/10-1)

Clumpy streams in a smooth dark halo: the case of Palomar 5.


Abstract (from CDS):

By means of direct N-body simulations and simplified numerical models, we study the formation and characteristics of the tidal tails around Palomar 5, along its orbit in the Milky Way potential. Unlike previous findings, we are able to reproduce the substructures observed in the stellar streams of this cluster, without including any lumpiness in the dark matter halo. We show that overdensities similar to those observed in Palomar 5 can be reproduced by the epicyclic motion of stars along its tails, i.e. a simple local accumulation of orbits of stars that escaped from the cluster with very similar positions and velocities. This process is able to form stellar clumps at distances of several kiloparsecs from the cluster, so it is not a phenomenon confined to the inner part of Palomar 5's tails, as previously suggested. Our models can reproduce the density contrast between the clumps and the surrounding tails found in the observed streams, without including any lumpiness in the dark halo, suggesting new upper limits on its granularity.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - globular clusters: individual: Palomar 5 - Galaxy: evolution - Galaxy: kinematics and dynamics - methods: numerical

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 Gal Anticenter reg 05 46 +28.9           ~ 853 0
2 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 809 0
3 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 711 1
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13679 0
5 NAME GD-1 Stream St* ~ ~           ~ 234 0

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