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2017ApJ...844..157L - Astrophys. J., 844, 157-157 (2017/August-1)

Detection of a large population of ultradiffuse galaxies in massive galaxy clusters: Abell S1063 and Abell 2744.


Abstract (from CDS):

We present the detection of a large population of ultradiffuse galaxies (UDGs) in two massive galaxy clusters, Abell S1063 at z = 0.348 and Abell 2744 at z = 0.308, based on F814W and F105W images in the Hubble Frontier Fields Program. We find 47 and 40 UDGs in Abell S1063 and Abell 2744, respectively. Color-magnitude diagrams of the UDGs show that they are mostly located at the faint end of the red sequence. From the comparison with simple stellar population models, we estimate their stellar mass to range from 108 to 109 M. Radial number density profiles of the UDGs show a turnover or a flattening in the central region at r < 100 kpc. We estimate the total masses of the UDGs using the galaxy scaling relations. A majority of the UDGs have total masses M200 = 1010-1011 M, and only a few of them have total masses M200 = 1011-1012 M. The total number of UDGs within the virial radius is estimated to be N(UDG) = 770 ± 114 for Abell S1063 and N(UDG) = 814 ± 122 for Abell 2744. Combining these results with data in the literature, we fit the relation between the total numbers of UDGs and the masses of their host systems for M200 > 1013 M with a power law, N(UDG) = M200^1.05±0.09^. These results suggest that a majority of the UDGs have a dwarf galaxy origin, while only a small number of the UDGs are massive L* galaxies that failed to form a normal population of stars.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: individual: (Abell S1063, Abell 2744) - galaxies: dwarf - galaxies: formation - galaxies: formation

VizieR on-line data: <Available at CDS (J/ApJ/844/157): table1.dat table2.dat table3.dat table4.dat>

Nomenclature: Table 1: [LKL2017] AS1063 UDG NN (Nos 01-45). Table 2: [LKL2017] AS1063 LSBdw NNN (Nos 001-115). Table 3: [LKL2017] A2744 UDG NN (Nos 01-39). Table 2: [LKL2017] A2744 LSBdw NN (Nos 01-78).

Simbad objects: 10

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