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

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

2010-07-16

arxiv.org/abs/1007.2806v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 figures, accepted for publication in MNRAS Letters Changes in v2: Merged previous figures 3 and 5 and slightly expanded disc

Scientific paper

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.

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