SIMBAD references

2014MNRAS.439.3808P - Mon. Not. R. Astron. Soc., 439, 3808-3816 (2014/April-3)

Ultracompact dwarfs in the Perseus Cluster: UCD formation via tidal stripping.

PENNY S.J., FORBES D.A., STRADER J., USHER C., BRODIE J.P. and ROMANOWSKY A.J.

Abstract (from CDS):

We present the results of a Keck/DEIMOS survey of Ultracompact dwarfs (UCDs) in the Perseus Cluster core. We confirm cluster membership for 14 UCDs, with radial velocities ∼ 5300 km/s. Two of these confirmed that Perseus UCDs have extremely blue colours (B - R < 0.6 mag), reside in star-forming filaments surrounding NGC 1275, and have likely formed as massive star clusters in the last ∼ 100 Myr. We also measure a central velocity dispersion of a third, UCD13 (σ0 = 38±8 km/s), the most extended UCD in our sample. We determine it to have radius R_e = 85 ±1.1 pc, a dynamical mass of (2.3±0.8)x108M, and a metallicity [Z/H]= -0.52^+0.33_-0.29 dex. UCD13 and the cluster's central galaxy, NGC 1275, have a projected separation of 30 kpc and a radial velocity difference of ∼ 20 km/s. Based on its size, red colour, internal velocity dispersion, dynamical mass, metallicity, and proximity to NGC 1275, we argue that UCD13 is likely the remnant nucleus of a tidally stripped dwarf elliptical (dE), with this progenitor dE having MB ~ -16 mag and mass ∼ 109M.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: clusters: individual: Perseus Cluster - galaxies: dwarf - galaxies: star clusters: general

Simbad objects: 29

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2019.09.17-07:11:44

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