A morphological study of galaxies in ZwCl0024+1652, a galaxy cluster at redshift z ∼ 0.4

Author:

Amado Zeleke Beyoro12,Pović Mirjana13,Sánchez-Portal Miguel456,Tessema S B1,Bongiovanni Ángel789,Cepa Jordi789,Cerviño Miguel10,González-Serrano J Ignacio11,Nadolny Jakub78,Garcia Ana Maria Pérez12,Pérez-Martinez Ricardo13,Pintos-Castro Irene14

Affiliation:

1. Astronomy and Astrophysics Research and Development Division, Ethiopian Space Science and Technology Institute (ESSTI), Entoto Observatory and Research Centre (EORC), PO Box 33679 Addis Ababa, Ethiopia

2. Department of Physics, College of Natural and Computational Sciences, Kotebe Metropolitan University, PO Box 31248 Addis Ababa, Ethiopia

3. Instituto de Astrofisića de Andaluciá (IAA-CSIC),Glorieta de la Astronomia s/n, E-18008 Granada, Spain

4. Instituto de Radioastronomía Milimétrica, Av. Divina Pastora 7, Núcleo Central, E-18012 Granada, Spain

5. European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago 763-0355, Chile

6. Joint ALMA Observatory, Alonso de Córdova, 3107, Vitacura, Santiago 763-0355, Chile

7. Instituto de Astrofísica de Canarias (IAC), E-38200 La Laguna, Tenerife, Spain

8. Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38205 La Laguna, Tenerife, Spain

9. Asociación Astrofísica para la Promoción de la Investigación, Instrumentación y su Desarrollo, ASPID, E-38205 La Laguna, Tenerife, Spain

10. Centro de Astrobiología (CSIC/INTA), E-28850 Torrejón de Ardoz, Madrid, Spain

11. Instituto de Física de Cantabria (CSIC – Universidad de Cantabria), Avda. de los Castros s/n, E-390055 Santander, Spain

12. Centro de Astrobiología (CSIC/INTA), ESAC Campus, Camino Bajo del Castillo s/n, E-28692 Villanueva de la Cañada, Spain

13. ISDEFE for ESA. Camino Bajo del Castillo s/n. Urb. Villafranca del Castillo. E-28692 Villanueva de la Cañada, Spain

14. Department of Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada

Abstract

Abstract The well-known cluster of galaxies ZwCl0024+1652 at z ∼ 0.4 lacks an in-depth morphological classification of its central region. While previous studies provide a visual classification of a patched area, we used the public code called galaxy Support Vector Machine (galsvm) and HST/ACS data as well as the WFP2 master catalogue to automatically classify all cluster members up to 1 Mpc. galsvm analyses galaxy morphologies through support vector machine (SVM). From the 231 cluster galaxies, we classified 97 as early types (ETs) and 83 as late types (LTs). The remaining 51 stayed unclassified (or undecided). By cross-matching our results with the existing visual classification, we found an agreement of 81 per cent. In addition to previous Zwcl0024 morphological classifications, 121 of our galaxies were classified for the first time in this work. In addition, we tested the location of classified galaxies on the standard morphological diagrams, colour–colour and colour–magnitude diagrams. Out of all cluster members, ∼20 per cent are emission-line galaxies, taking into account previous GLACE results. We have verified that the ET fraction is slightly higher near the cluster core and decreases with the clustercentric distance, while the opposite trend has been observed for LT galaxies. We found a higher fraction of ETs (54  per cent) than LTs (46  per cent) throughout the analysed central region, as expected. In addition, we analysed the correlation between the five morphological parameters (Abraham concentration, Bershady–Concelice concentration, asymmetry, Gini, and M20 moment of light) and the clustercentric distance, without finding a clear trend. Finally, as a result of our work, the morphological catalogue of 231 galaxies containing all the measured parameters and the final classification is available in the electronic form of this paper.

Funder

Ethiopian Space Science and Technology Institute

Joint ALMA Observatory

Kotebe Metropolitan University

Ministerio de Economía y Competitividad

European Space Agency

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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