A 3D Voronoi+Gapper Galaxy Cluster Finder in Redshift Space to z ∼ 0.2. II. An Abundant Cluster Population Dominated by Late-type Galaxies Unveiled
Author
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Campusano Brown, Luis
Author
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Marinello, Gabriel
Author
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Clowes, Roger G.
Author
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Haines, Christopher P.
Author
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Pereira, Sebastián
Author
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Pizarro, Daniel
Author
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Hitschfeld Kahler, Nancy
Author
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Söchting, Ilona K.
Admission date
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2020-04-27T23:06:05Z
Available date
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2020-04-27T23:06:05Z
Publication date
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2020
Cita de ítem
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The Astrophysical Journal, 890:91 (2pp), 2020 February 10
es_ES
Identifier
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10.3847/1538-4357/ab6b26
Identifier
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https://repositorio.uchile.cl/handle/2250/174165
Abstract
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We identify 1901 galaxy clusters (N-g >= 2) with the VoML+G algorithm (Paper I) on the Two-Degree Field Galaxy Redshift Survey. We present the 341 clusters with at least 10 galaxies that are within 0.009 < z < 0.14 (the Catalog), of which 254 (similar to 75%) have counterparts in the literature (NED), with the remainder (87) plausibly "new" because of incompleteness of previous searches or unusual galaxy contents. The 207 clusters within z = 0.04-0.09 are used to study the properties of the galaxy systems in the nearby universe, including their galaxy contents parameterized by the late-type galaxy fractions (f(L)). For this nearly complete cluster subsample, we find the following: (i) 63% are dominated by early-type galaxies (i.e., the late-type-poor clusters, f(L) < 0.5) with corresponding mean multiplicity and logarithmic virial mass (in units of M-circle dot) of 22 +/- 1 and 12.91 +/- 0.04, respectively; and (ii) 37% are dominated by late-type galaxies (i.e., the late-type-rich clusters, f(L) >= 0.5) with corresponding mean multiplicity and logarithmic virial mass (in units of M-circle dot) of 15.7 +/- 0.9 and 12.66 +/- 0.07, respectively. The statistical analysis of the late-type fraction distribution supports, with a 3 sigma confidence level, the presence of two population components. It is suggested that the late-type-poor galaxy systems reflect and extend the class of Abell-APM-EDCC clusters and that the late-type-rich systems (similar to one-third of the total) belong to a new, previously unappreciated class. The late-type-rich clusters, on average high mass-to-light ratio systems, appear to be more clustered on large scales than the late-type-poor clusters. A class of late-type-rich clusters is not predicted by current theory.
es_ES
Patrocinador
dc.description.sponsorship
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT PIA/ANILLOS
ACT-1122
CONICYT project Basal
AFB-170002
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
1040499
7040066