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The devil is in the tails: the role of globular cluster mass evolution on stream properties

Balbinot, Eduardo and Gieles, Mark (2017) The devil is in the tails: the role of globular cluster mass evolution on stream properties Monthly Notices of the Royal Astronomical Society, 474 (2). pp. 2479-2492.

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We present a study of the effects of collisional dynamics on the formation and detectability of cold tidal streams. A semi-analytical model for the evolution of the stellar mass function was implemented and coupled to a fast stellar stream simulation code, as well as the synthetic cluster evolution code EMACSS for the mass evolution as a function of a globular cluster orbit. We find that the increase in the average mass of the escaping stars for clusters close to dissolution has a major effect on the observable stream surface density. As an example, we show that Palomar 5 would have undetectable streams (in an SDSS-like survey) if it was currently three times more massive, despite the fact that a more massive cluster loses stars at a higher rate. This bias due to the preferential escape of low-mass stars is an alternative explanation for the absence of tails near massive clusters, than a dark matter halo associated with the cluster. We explore the orbits of a large sample of Milky Way globular clusters and derive their initial masses and remaining mass fraction. Using properties of known tidal tails we explore regions of parameter space that favour the detectability of a stream. A list of high probability candidates is discussed.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Date : 23 October 2017
DOI : 10.1093/mnras/stx2708
Copyright Disclaimer : © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Uncontrolled Keywords : Globular clusters: general. Galaxy: structure.
Depositing User : Clive Harris
Date Deposited : 31 Oct 2017 15:46
Last Modified : 16 Jan 2019 19:03

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