Bibcode
Amado, Zeleke Beyoro; Pović, Mirjana; Sánchez-Portal, Miguel; Tessema, S. B.; Bongiovanni, Á.; Cepa, J.; Cerviño, Miguel; González-Serrano, J. Ignacio; Nadolny, J.; Garcia, Ana Maria Pérez; Pérez-Martinez, Ricardo; Pintos-Castro, Irene
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 2, p.1528-1545
Advertised on:
5
2019
Citations
7
Refereed citations
4
Description
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.
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