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

M. Niederste-Ostholt, V. Belokurov, N. W. Evans, S. Koposov, M. Gieles, M. J. Irwin

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society: Letters
Publication statusPublished - 1 Oct 2010


  • astro-ph.GA


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