TY - JOUR
T1 - Unveiling the Dynamical State of Massive Clusters through the ICL Fraction
AU - Jiménez-Teja, Yolanda
AU - Dupke, Renato
AU - Benítez, Narciso
AU - Koekemoer, Anton M.
AU - Zitrin, Adi
AU - Umetsu, Keiichi
AU - Ziegler, Bodo L.
AU - Frye, Brenda L.
AU - Ford, Holland
AU - Bouwens, Rychard J.
AU - Bradley, Larry D.
AU - Broadhurst, Thomas
AU - Coe, Dan
AU - Donahue, Megan
AU - Graves, Genevieve J.
AU - Grillo, Claudio
AU - Infante, Leopoldo
AU - Jouvel, Stephanie
AU - Kelson, Daniel D.
AU - Lahav, Ofer
AU - Lazkoz, Ruth
AU - Lemze, Dorom
AU - Maoz, Dan
AU - Medezinski, Elinor
AU - Melchior, Peter
AU - Meneghetti, Massimo
AU - Mercurio, Amata
AU - Merten, Julian
AU - Molino, Alberto
AU - Moustakas, Leonidas A.
AU - Nonino, Mario
AU - Ogaz, Sara
AU - Riess, Adam G.
AU - Rosati, Piero
AU - Sayers, Jack
AU - Seitz, Stella
AU - Zheng, Wei
N1 - Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved.
PY - 2018/4/20
Y1 - 2018/4/20
N2 - We have selected a sample of 11 massive clusters of galaxies observed by the Hubble Space Telescope in order to study the impact of the dynamical state on the intracluster light (ICL) fraction, the ratio of total integrated ICL to the total galaxy member light. With the exception of the Bullet cluster, the sample is drawn from the Cluster Lensing and Supernova Survey and the Frontier Fields program, containing five relaxed and six merging clusters. The ICL fraction is calculated in three optical filters using the CHEFs ICL estimator, a robust and accurate algorithm free of a priori assumptions. We find that the ICL fraction in the three bands is, on average, higher for the merging clusters, ranging between ∼7% and 23%, compared with the ∼2%-11% found for the relaxed systems. We observe a nearly constant value (within the error bars) in the ICL fraction of the regular clusters at the three wavelengths considered, which would indicate that the colors of the ICL and the cluster galaxies are, on average, coincident and, thus, so are their stellar populations. However, we find a higher ICL fraction in the F606W filter for the merging clusters, consistent with an excess of lower-metallicity/younger stars in the ICL, which could have migrated violently from the outskirts of the infalling galaxies during the merger event.
AB - We have selected a sample of 11 massive clusters of galaxies observed by the Hubble Space Telescope in order to study the impact of the dynamical state on the intracluster light (ICL) fraction, the ratio of total integrated ICL to the total galaxy member light. With the exception of the Bullet cluster, the sample is drawn from the Cluster Lensing and Supernova Survey and the Frontier Fields program, containing five relaxed and six merging clusters. The ICL fraction is calculated in three optical filters using the CHEFs ICL estimator, a robust and accurate algorithm free of a priori assumptions. We find that the ICL fraction in the three bands is, on average, higher for the merging clusters, ranging between ∼7% and 23%, compared with the ∼2%-11% found for the relaxed systems. We observe a nearly constant value (within the error bars) in the ICL fraction of the regular clusters at the three wavelengths considered, which would indicate that the colors of the ICL and the cluster galaxies are, on average, coincident and, thus, so are their stellar populations. However, we find a higher ICL fraction in the F606W filter for the merging clusters, consistent with an excess of lower-metallicity/younger stars in the ICL, which could have migrated violently from the outskirts of the infalling galaxies during the merger event.
KW - galaxies: clusters: general
KW - techniques: image processing
UR - http://www.scopus.com/inward/record.url?scp=85046369987&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/aab70f
DO - 10.3847/1538-4357/aab70f
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AN - SCOPUS:85046369987
SN - 0004-637X
VL - 857
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 79
ER -