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The Tidal Tails of the Ultra-Faint Globular Cluster Palomar 1

Niederste-Ostholt, M, Belokurov, V, Evans, NW, Koposov, S, Gieles, M and Irwin, MJ (2010) The Tidal Tails of the Ultra-Faint Globular Cluster Palomar 1

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Using the Optimal Filter Technique applied to Sloan Digital Sky Survey photometry, we have found extended tails stretching about 1 degree (or several tens of half-light radii) from either side of the ultra-faint globular cluster Palomar 1. The tails contain roughly as many stars as does the cluster itself. Using deeper Hubble Space Telescope data, we see that the isophotes twist in a chacteristic S-shape on moving outwards from the cluster centre to the tails. We argue that the main mechanism forming the tails may be relaxation driven evaporation and that Pal 1 may have been accreted from a now disrupted dwarf galaxy ~500 Myr ago.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Niederste-Ostholt, M
Belokurov, V
Evans, NW
Koposov, S
Irwin, MJ
Date : 16 July 2010
DOI : 10.1111/j.1745-3933.2010.00931.x
Uncontrolled Keywords : astro-ph.GA, astro-ph.GA
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:40
Last Modified : 24 Jan 2020 22:38

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