%0 Journal Article %T The Tidal Tails of the Ultra-Faint Globular Cluster Palomar 1 %A M. Niederste-Ostholt %A V. Belokurov %A N. W. Evans %A S. Koposov %A M. Gieles %A M. J. Irwin %J Physics %D 2010 %I arXiv %R 10.1111/j.1745-3933.2010.00931.x %X 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. %U http://arxiv.org/abs/1007.2806v2