University of Oulu

Iodice, E., Spavone, M., Cantiello, M., D’Abrusco, R., Capaccioli, M., Hilker, M., Mieske, S., Napolitano, N., Peletier, R., Limatola, L., Grado, A., Venhola, A., Paolillo, M., Ven, G., Schipani, P. (2017) Intracluster Patches of Baryons in the Core of the Fornax Cluster. Astrophysical Journal, 851 (2), 75. doi:10.3847/1538-4357/aa9b30

Intracluster patches of baryons in the core of the Fornax cluster

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Author: Iodice, E.1; Spavone, M.1; Cantiello, M.2;
Organizations: 1INAF-Astronomical Observatory of Capodimonte
2INAF-Astronomical Observatory of Teramo
3Smithsonian Astrophysical Observatory/Chandra X-ray Center
4University of Naples “Federico II”
5European Southern Observatory
6Kapteyn Astronomical Institute, University of Groningen
7Division of Astronomy, Department of Physics, University of Oulu
8University of Naples "Federico II"
9Max Planck Institute for Astronomy
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3 MB)
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Language: English
Published: IOP Publishing, 2017
Published for the American Astronomical Society, 2017
Publish Date: 2018-01-15


In the core of the Fornax cluster, on the west side of NGC 1399, we have detected a previously unknown region of intracluster light (ICL). It is made up by several faint (μr ≃ 28–29 mag arcsec⁻²) patches of diffuse light. The bulk of the ICL is located in between the three bright galaxies in the core, NGC 1387, NGC 1379, and NGC 1381, at 10 ⩽ R ⩽ 40 arcmin (~58–230 kpc) from the central galaxy NGC 1399. We show that the ICL is the counterpart in the diffuse light of the known over-density in the population of blue globular clusters (GCs). The total g-band luminosity of the ICL is Lg ≃ 8.3 × 10⁹ L ⊙, which is ~5% of the total luminosity of NGC 1399. This is consistent with the fraction of the blue GCs in the same region of the cluster. The ICL has g − r ∼ mag, which is similar to the colors in the halo of the bright galaxies in the cluster core. The new findings were compared with theoretical predictions for the ICL formation and they support a scenario in which the intracluster population detected in the core of the Fornax cluster is build up by the tidal stripping of material (stars and GCs) from galaxy outskirts in a close passage with the central brightest galaxy (cD). Moreover, the diffuse form of the ICL and its location close to the core of the cluster is expected in a dynamically evolved cluster like Fornax.

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Series: Astrophysical journal
ISSN: 0004-637X
ISSN-E: 1538-4357
ISSN-L: 0004-637X
Volume: 851
Issue: 2
Article number: 75
DOI: 10.3847/1538-4357/aa9b30
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: Authors acknowledges financial support from the INAF VST funds and wish to thank ESO for the financial contribution given for the visitor moderuns at the ESO La Silla Paranal Observatory. The authors acknowledges financial support from the European Unions Horizon 2020 research and innovation program under the Marie Skodowska-Curie grant agreement No. 721463 to the SUNDIAL ITN network. N.R.N. and E.I. received support within PRIN INAF 2014 “Fornax Cluster Imaging and Spectroscopic Deep Survey.” G.VdV. acknowledges partial support from Sonderforschungsbereich SFB 881 “The Milky Way System” (subprojects A7 and A8) funded by the German Research Foundation.
EU Grant Number: (721463) SUNDIAL - SUrvey Network for Deep Imaging Analysis and Learning
Copyright information: © 2017. The American Astronomical Society. All rights reserved. Published in this repository with the kind permission of the publisher.