GLACE survey: OSIRIS/GTC tuneable filter Hα imaging of the rich galaxy cluster ZwCl 0024.0+1652 at z=0.395

Sánchez-Portal, M. and Pintos-Castro, I. and Pérez-Martínez, R. and Cepa,, J. and Pérez García, A.M. and Domínguez-Sánchez, H. and Bongiovanni, A. and Serra, A.L. and Alfaro, E. and Altieri, B. and Aragón-Salamanca, A. and Balkowski, C. and Biviano, A. and Bremer, M. and Castander, F. and Castañeda, H. and Castro-Rodríguez, N. and Chies-Santos, A.L. and Coia, D. and Diaferio, A. and Duc, P.A. and Ederoclite, A. and Geach, J. and González-Serrano, I. and Haines, C.P. and McBreen, B. and Metcalfe, L. and Oteo, I. and Pérez-Fournón, I. and Poggianti, B. and Polednikova, J. and Ramón-Pérez, M. and Rodríguez-Espinosa, J.M. and Santos, J.S. and Smail, I. and Smith, G.P. and Temporin, S. and Valtchanov, I. (2015) GLACE survey: OSIRIS/GTC tuneable filter Hα imaging of the rich galaxy cluster ZwCl 0024.0+1652 at z=0.395. Astronomy & Astrophysics, 578 . A30/1-A30/22. ISSN 0004-6361

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The cores of clusters at 0 ≲ z ≲ 1 are dominated by quiescent early-type galaxies, whereas the field is dominated by star-forming late-type galaxies. Clusters grow through the accretion of galaxies and groups from the surrounding field, which implies that galaxy properties, notably the star formation ability, are altered as they fall into overdense regions. The critical issues for understanding this evolution are how the truncation of star formation is connected to the morphological transformation and what physical mechanism is responsible for these changes. The GaLAxy Cluster Evolution Survey (GLACE) is conducting a thorough study of the variations in galaxy properties (star formation, AGN activity, and morphology) as a function of environment in a representative and well-studied sample of clusters. To address these questions, the GLACE survey is making a deep panoramic survey of emission line galaxies (ELG), mapping a set of optical lines ([O ii], [O iii], Hβ andHα/[N ii] when possible) in several galaxy clusters at z ~ 0.40, 0.63, and 0.86. Using the tunable filters (TF) of the OSIRIS instrument at the 10.4 m GTC telescope, the GLACE survey applies the technique of TF tomography: for each line, a set of images are taken through the OSIRIS TF, each image tuned at a different wavelength (equally spaced), to cover a rest frame velocity range of several thousand km s-1 centred on the mean cluster redshift, and scanned for the full TF field of view of an 8 arcmin diameter. Here we present the first results of the GLACE project, targeting the Hα/[N ii] lines in the intermediate-redshift cluster ZwCl 0024.0+1652 at z = 0.395. Two pointings have been performed that cover ~2 × rvir. We discuss the specific techniques devised to process the TF tomography observations in order to generate the catalogue of cluster Hα emitters, which contains more than 200 sources down to a star formation rate (SFR) ≲1 M⊙/yr. An ancillary broadband catalogue is constructed, allowing us to discriminate line interlopers by means of colour diagnostics. The final catalogue contains 174 unique cluster sources. The AGN population is distinguished using different diagnostics and found to be ~37% of the ELG population. The median SFR of the star-forming population is 1.4 M⊙/yr. We studied the spatial distribution of ELG and confirm the existence of two components in the redshift space. Finally, we exploited the outstanding spectral resolution of the TF, attempting to estimate the cluster mass from ELG dynamics, finding M200 = (4.1 ± 0.2) × 1014 M⊙ h-1, in agreement with previous weak-lensing estimates.

Item Type: Article
Keywords: galaxies: clusters: individual: ZwCl 0024.0+1652 – galaxies: photometry – galaxies: star formation – galaxies: active
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1051/0004-6361/201525620
Depositing User: Aragon-salamanca, Alfonso
Date Deposited: 20 Apr 2017 10:06
Last Modified: 20 Apr 2017 10:12

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