The Tidal Tails of the Ultra-Faint Globular Cluster Palomar 1 - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




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Abstract: Using the Optimal Filter Technique applied to Sloan Digital Sky Surveyphotometry, we have found extended tails stretching about 1 degree or severaltens of half-light radii from either side of the ultra-faint globular clusterPalomar 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 achacteristic S-shape on moving outwards from the cluster centre to the tails.We argue that the main mechanism forming the tails may be relaxation drivenevaporation and that Pal 1 may have been accreted from a now disrupted dwarfgalaxy ~500 Myr ago.



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

Fuente: https://arxiv.org/







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