University of Oulu

Raj, M. A., Iodice, E., Napolitano, N. R., Hilker, M., Spavone, M., Peletier, R. F., Su, H.-S., Falcón-Barroso, J., van de Ven, G., Cantiello, M., Kleiner, D., Venhola, A., Mieske, S., Paolillo, M., Capaccioli, M., & Schipani, P. (2020). The Fornax Deep Survey with VST. Astronomy & Astrophysics, 640, A137.

The Fornax Deep Survey with VST : X. The assembly history of the bright galaxies and intra-group light in the Fornax A subgroup

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Author: Raj, M. A.1,2,3; Iodice, E.1,3; Napolitano, N. R.4;
Organizations: 1INAF-Astronomical observatory of Capodimonte, Via Moiariello 16, Naples 80131, Italy
2University of Naples “Federico II”, C.U, Monte Santangelo, Via Cinthia, 80126 Naples, Italy
3European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei Munchen, Germany
4School of Physics and Astronomy, Sun Yat-sen University Zhuhai Campus, 2 Daxue Road, Tangjia, Zhuhai, Guangdong 519082,PR China
5Kapteyn Astronomical Institute, University of Groningen, PO Box 72, 9700 AV Groningen, The Netherlands
6Division of Astronomy, Department of Physics, University of Oulu, Oulu, Finland
7nstituto de Astrofìsica de Canarias, C Via Lactea s/n, 38200 La Laguna, Canary Islands, Spain
8Departamento de Astrofìsica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
9Department of Astrophysics, University of Vienna, Türkenschanzstrasse, 17, 1180 Vienna, Austria
10INAF-Astronomical Abruzzo Observatory, Via Maggini, 64100 Teramo, Italy
11INAF – Osservatorio Astronomico di Cagliari, Via della Scienza 5, 09047 Selargius, (CA), Italy
12European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile
13INFN – Sezione di Napoli, Napoli 80126, Italy
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 35.8 MB)
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Language: English
Published: EDP Sciences, 2020
Publish Date: 2020-10-13


Context: We present the study of the south-west group in the Fornax cluster centred on the brightest group galaxy (BGG) Fornax A, which was observed as part of the Fornax Deep Survey (FDS). This includes the analysis of the bright group members (mB < 16 mag) and the intra-group light (IGL).

Aims: The main objective of this work is to investigate the assembly history of the Fornax A group and to compare its physical quantities as a function of the environment to that of the Fornax cluster core.

Results: The majority of galaxies in the Fornax A group are late-type galaxies (LTGs), spanning a range of stellar mass of 8 < log(M* M) < 10.5. Six out of nine LTGs show a Type III (up-bending) break in their light profiles, which is either suggestive of strangulation halting star formation in their outskirts or their H I-richness causing enhanced star formation in their outer-discs. Overall, we do not find any correlations between their physical properties and their group-centric distance. The estimated luminosity of the IGL is 6 ± 2 × 1010 L in the g-band, which corresponds to about 16% of the total light in the group.

Conclusions: The Fornax A group appears to be in an early-stage of assembly with respect to the cluster core. The environment of the Fornax A group is not as dense as that of the cluster core, with all galaxies except the BGG showing similar morphology, comparable colours and stellar masses, and Type III disc-breaks, without any clear trend in these properties with group-centric distances. The low amount of IGL is also consistent with this picture, since there were no significant gravitational interactions between galaxies that modified the galaxies’ structure and contributed to the build-up of the IGL. The main contribution to the IGL is from the minor merging in the outskirts of the BGG NGC 1316 and, probably, the disrupted dwarf galaxies close to the group centre.

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Series: Astronomy and astrophysics
ISSN: 0004-6361
ISSN-E: 1432-0746
ISSN-L: 0004-6361
Volume: 640
Article number: A137
DOI: 10.1051/0004-6361/202038043
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This publication has received funding from the European Union Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement n. 721463 to the SUNDIAL ITN network. This work is based on visitor mode observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under the following VST GTO programs: 094.B-0512(B),094.B-0496(A), 096.B-0501(B), 096.B-0582(A). NRN acknowledges financial support from the “One hundred top talent program of Sun Yatsen University” grant N. 71000-18841229. J.F-B acknowledges support through the RAVET project by the grant AYA2016-77237-C3-1-P from the Spanish Ministry of Science, Innovation and Universities (MCIU) and through the IAC project TRACES which is partially supported through the state budget and the regional budget of the Consejería de Economía, Industria, Comercio y Conocimiento of the Canary Islands Autonomous Community. GvdV acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 724857 (Consolidator Grant ArcheoDyn).
EU Grant Number: (721463) SUNDIAL - SUrvey Network for Deep Imaging Analysis and Learning
Copyright information: © ESO 2020.