J/MNRAS/458/226 MeSsI low-redshift merging cluster sample (de los Rios+, 2016)
The MeSsI (merging systems identification) algorithm and catalogue.
de los Rios M., Dominguez M.J.R., Paz D., Merchan M.
<Mon. Not. R. Astron. Soc., 458, 226-232 (2016)>
=2016MNRAS.458..226D 2016MNRAS.458..226D (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Morphology
Keywords: galaxies: clusters: general- galaxies: kinematics and dynamics -
dark matter
Abstract:
Merging galaxy systems provide observational evidence of the existence
of dark matter and constraints on its properties. Therefore,
statistically uniform samples of merging systems would be a powerful
tool for several studies. In this paper, we present a new methodology
for the identification of merging systems and the results of its
application to galaxy redshift surveys. We use as a starting point a
mock catalogue of galaxy systems, identified using friends-of-friends
algorithms, that have experienced a major merger, as indicated by its
merger tree. By applying machine learning techniques in this training
sample, and using several features computed from the observable
properties of galaxy members, it is possible to select galaxy groups
that have a high probability of having experienced a major merger.
Next, we apply a mixture of Gaussian techniques on galaxy members in
order to reconstruct the properties of the haloes involved in such
mergers. This methodology provides a highly reliable sample of merging
systems with low contamination and precisely recovered properties. We
apply our techniques to samples of galaxy systems obtained from the
Sloan Digital Sky Survey Data Release 7, the Wide-Field Nearby
Galaxy-Cluster Survey (WINGS) and the Hectospec Cluster Survey (HeCS).
Our results recover previously known merging systems and provide
several new candidates. We present their measured properties and
discuss future analysis on current and forthcoming samples.
Description:
We construct mock catalogues of the SDSS-DR7 redshift survey based on
the results of a semi-analytical model (Guo et al.
2011MNRAS.413..101G 2011MNRAS.413..101G) and we use it to calibrate our identification
method for merging systems.
Here we present the low-redshift merging cluster sample, including the
properties of the two main substructures identified by our algorithm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 128 31 Low-redshift merging cluster sample, including
the properties of the two main substructures
identified by our algorithm.
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See also:
J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010)
J/MNRAS/418/1409 : Compact groups of galaxies in SDSS DR7 (Mendel+, 2011)
J/MNRAS/422/25 : SDSS DR7 groups, clusters and filaments (Smith+, 2012)
J/ApJ/799/95 : Structure in 3D galaxy distribution. II. Voids (Way+, 2015)
J/A+A/588/A14 : Friends-of-friends galaxy group finder (Tempel+, 2016)
J/AJ/132/1275 : CIRS (Cluster Infall Regions in the SDSS). I (Rines+, 2006)
J/A+A/470/39 : Substructures in WINGS clusters (Ramella+, 2007)
J/MNRAS/390/289 : Radio observations of A3158 (Johnston-Hollitt+, 2008)
J/A+A/540/A43 : New redshifts for Abell 1758N galaxies (Boschin+, 2012)
J/A+A/540/A123 : Galaxy clusters from SDSS DR8 (Einasto+, 2012)
J/MNRAS/436/275 : 2092 rich galaxy clusters relaxation parameter (Wen+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Cluster Cluster name
18- 23 F6.2 10+14Msun Mass1 Mass of the first substructure
25- 29 F5.1 10+14Msun e_Mass1 Error on Mass1
31- 37 F7.3 deg RAdeg Rigth Ascension of first substructure (J2000)
39- 43 F5.3 deg e_RAdeg Error on RAdeg
45- 51 F7.3 deg DEdeg Declination of the first substructure (J2000)
53- 57 F5.3 deg e_DEdeg Error on DEdeg
59- 64 F6.4 --- z1 Redsfhit of the first substructure
66- 71 F6.4 --- e_z1 Error on z1
73- 78 F6.2 10+14Msun Mass2 Mass of the second substructure
80- 84 F5.2 10+14Msun e_Mass2 Error on Mass2
86- 92 F7.3 deg RA2deg Rigth Ascension of second substructure
(J2000)
94- 98 F5.3 deg e_RA2deg Error on RA2deg
100-106 F7.3 deg DE2deg Declination of second substructure (J2000)
108-113 F6.4 deg e_DE2deg Error on RE2deg
115-121 F7.5 --- z2 Redsfhit of the second substructure
123-128 F6.4 --- e_z2 Error on z2
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-May-2017