J/ApJS/252/27 WWFI g'-band obs. of bright galaxy clusters (Kluge+, 2021)
Photometric dissection of intracluster light and its correlations with host
cluster properties.
Kluge M., Bender R., Riffeser A., Goessl C., Hopp U., Schmidt M., Ries C.
<Astrophys. J. Suppl. Ser., 252, 27 (2021)>
=2021ApJS..252...27K 2021ApJS..252...27K
ADC_Keywords: Clusters, galaxy; Velocity dispersion; Optical
Keywords: Brightest cluster galaxies ; Galaxy clusters ; Galaxy stellar halos ;
Surface photometry ; Scaling relations
Abstract:
We explore several ways to dissect brightest cluster galaxies (BCGs)
and their surrounding intracluster light (ICL) using a surface
brightness (SB) cut, a luminosity cut, excess light above a de
Vaucouleurs profile, or a double Sersic decomposition. Assuming that
all light above M<-21.85g'mag is attributable to the ICL, we find
that an average fraction of fICLMT=71±22% of all diffuse light
centered on the BCG belongs to the ICL. Likewise, if we assume that
all light fainter than SB>27g'mag/arcsec2 belongs to the ICL, the
average ICL fraction is fICLSB27=34±19% . After fitting a de
Vaucouleurs profile to the inner parts of the SB profile, we detect
excess light at large radii, corresponding to an average ICL fraction
of fICLDV=48±20% . Finally, by decomposing the SB profile into
two Sersic functions, we find an average ICL fraction of
fICLSx=52±21% associated with the outer Sersic component. Our
measured ICL and BCG+ICL luminosities agree well with predictions from
high-resolution simulations where the outer Sersic component traces
the unrelaxed, accreted stellar material. BCG and ICL properties
defined in this way are correlated with cluster parameters to study
the coevolution of BCGs, ICL, and their host clusters. We find
positive correlations between BCG+ICL brightness and cluster mass,
cluster velocity dispersion, cluster radius, and integrated satellite
brightness, confirming that BCG/ICL growth is indeed coupled with
cluster growth. On average, the ICL is better aligned than the BCG
with the host cluster in terms of position angle, ellipticity, and
centering. That makes it a potential dark-matter tracer.
Description:
Our full observational data set and data reduction pipeline are
detailed in Kluge+ (2020, J/ApJS/247/43).
In brief, we have observed 170 low-redshift (z≳0.08) galaxy clusters
in the northern hemisphere (DEC≳5°) with the 2m Fraunhofer
telescope at the Wendelstein Observatory, Germany. The observations
were taken in the g' band with the Wendelstein Wide Field Imager (WWFI).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 111 170 Host cluster parameters
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
J/ApJ/664/226 : Nuker law parameters of early-type galaxies (Lauer+, 2007)
J/MNRAS/379/867 : BCG C4 cluster catalog (von der Linden+, 2007)
J/ApJS/182/216 : Surface photometry of Virgo ellipticals (Kormendy+, 2009)
J/ApJS/195/15 : Luminosity profiles of BCGs (Donzelli+, 2011)
J/ApJ/797/82 : Brightest cluster galaxies in Abell clusters (Lauer+, 2014)
J/A+A/609/A78 : MUSE combined data cubes for NGC 3311 (Barbosa+, 2018)
J/ApJS/247/43 : WWFI g'-band obs. of bright cluster galaxies (Kluge+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Cluster name (1)
7- 10 I4 km/s sigmac [123/1506]? Cluster velocity
dispersion
12- 15 I4 km/s e_sigmac [21/1758]? Error of cluster
velocity dispersion
17- 19 I3 --- S [59/714]? Richness, number of
galaxies in cluster
21- 24 I4 kpc Radg [474/1651]? Gravitational cluster
radius
26- 28 I3 kpc e_Radg [100/467]? Error on Radg
30- 35 F6.2 mag Msat [-27.4/-22.2]? Satellite galaxies
brightness
37- 40 F4.2 mag e_Msat [0.4/4]? Error on Msat
42- 46 F5.2 [Msun] logMg [13.9/15.4]? Gravitational
cluster mass
48- 51 F4.2 [Msun] e_logMg [0.03/0.4]? Error on logMg
53- 56 I4 km/s Vsyst [0/1317]? BCG vs mean cluster
systemic velocity offset from
Lauer+2014, J/ApJ/797/82
58- 62 F5.1 km/s e_Vsyst [30/273]? Error on Vsyst
64- 67 I4 kpc Rsyst [0/2065]? Radial offset between
BCG and X-ray cluster center from
Lauer+2014, J/ApJ/797/82
69- 72 F4.2 [Msun/kpc3] logrho [4.4/5.9]? log of mass density
74- 77 F4.2 [Msun/kpc3] e_logrho [0.03/0.4]? Error on logrho
79- 83 F5.2 [kpc-3] logs [-7.7/-5.5]? Satellite galaxy
number density
85- 88 F4.2 [kpc-3] e_logs [0.09/0.4]? Error on logs
90- 94 F5.2 [Msun/kpc3/km3.s3] logfM [-4.2/-2.9]? Mass phase space
density
96- 99 F4.2 [Msun/kpc3/km3.s3] e_logfM [0.03/0.4]? Error on logfM
101- 106 F6.2 [kpc-3/km3.s3] logfs [-16.4/-14.2]? Number phase space
density
108- 111 F4.2 [kpc-3/km3.s3] e_logfs [0.09/0.4]? Error on logfs
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Note (1): Cluster names by prefix --
A = ACO catalog, Abell+ (1989ApJS...70....1A 1989ApJS...70....1A, Cat. VII/110);
AWM = Albert+ (1977ApJ...211..309A 1977ApJ...211..309A) with aliases (AWM1=WBL 213;
AWM5=NGC 6269 GROUP; AWM7=WBL 088);
L = Von Der Linden+ (2007, J/MNRAS/379/867), more commonly SDSS-C4-DR3 ####;
MKW = Morgan+ (1975ApJ...199..545M 1975ApJ...199..545M).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Apr-2021