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.
Unveiling the Dynamical State of Massive Clusters through the ICL Fraction / Y. Jiménez-Teja, R. Dupke, N. Benítez, A.M. Koekemoer, A. Zitrin, K. Umetsu, B.L. Ziegler, B.L. Frye, H. Ford, R.J. Bouwens, L.D. Bradley, T. Broadhurst, D. Coe, M. Donahue, G.J. Graves, C. Grillo, L. Infante, S. Jouvel, D.D. Kelson, O. Lahav, R. Lazkoz, D. Lemze, D. Maoz, E. Medezinski, P. Melchior, M. Meneghetti, A. Mercurio, J. Merten, A. Molino, L.A. Moustakas, M. Nonino, S. Ogaz, A.G. Riess, P. Rosati, J. Sayers, S. Seitz, W. Zheng. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 857:2(2018 Apr 20).
|Titolo:||Unveiling the Dynamical State of Massive Clusters through the ICL Fraction|
|Parole Chiave:||galaxies: clusters: general; techniques: image processing; astronomy and astrophysics; space and planetary science|
|Settore Scientifico Disciplinare:||Settore FIS/05 - Astronomia e Astrofisica|
|Data di pubblicazione:||20-apr-2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3847/1538-4357/aab70f|
|Appare nelle tipologie:||01 - Articolo su periodico|