The XXL Survey. XXII. The XXL-North spectrophotometric sample and galaxy stellar mass function in X-ray detected groups and clusters

Guglielmo, V. and Poggianti, B. M. and Vulcani, B. and Adami, C. and Gastaldello, F. and Ettori, S. and Fotopoulou, S. and Koulouridis, E. and Ramos Ceja, M. E. and Giles, P. and McGee, S. and Altieri, B. and Baldry, I. and Birkinshaw, M. and Bolzonella, M. and Bongiorno, A. and Brown, M. and Chiappetti, L. and Driver, S. and Elyiv, A. and Evrard, A. and Garilli, B. and Grootes, M. and Guennou, L. and Hopkins, A. and Horellou, C. and Iovino, A. and Lidman, C. and Liske, J. and Maurogordato, S. and Owers, M. and Pacaud, F. and Paltani, S. and Pierre, M. and Plionis, M. and Ponman, T. and Robotham, A. and Sadibekova, T. and Scodeggio, M. and Sereno, M. and Smolčić, Vernesa and Tuffs, R. and Valtchanov, I. and Vignali, C. and Willis, J. (2018) The XXL Survey. XXII. The XXL-North spectrophotometric sample and galaxy stellar mass function in X-ray detected groups and clusters. Astronomy and Astrophysics, 620. A7-1-A7-20. ISSN 0004-6361

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Context. The fraction of galaxies bound in groups in the nearby Universe is high (50% at z ~ 0). Systematic studies of galaxy properties in groups are important in order to improve our understanding of the evolution of galaxies and of the physical phenomena occurring within this environment. Aims. We have built a complete spectrophotometric sample of galaxies within X-ray detected, optically spectroscopically confirmed groups and clusters (G&C), covering a wide range of halo masses at z ≤ 0.6. Methods. In the context of the XXL survey, we analyse a sample of 164 G&C in the XXL-North region (XXL-N), at z ≤ 0.6, with a wide range of virial masses (1.24 x 10^13 ≤ M_500,scal(M_⊙) ≤ 6.63 x 10^14) and X-ray luminosities (2.27 x 10^41 ≤ L^XXL _500,scal(erg s^-1) ≤ 2.15 x 10^44). The G&C are X-ray selected and spectroscopically confirmed. We describe the membership assignment and the spectroscopic completeness analysis, and compute stellar masses. As a first scientific exploitation of the sample, we study the dependence of the galaxy stellar mass function (GSMF) on global environment. Results. We present a spectrophotometric characterisation of the G&C and their galaxies. The final sample contains 132 G&C, 22 111 field galaxies and 2225 G&C galaxies with r-band magnitude <20. Of the G&C, 95% have at least three spectroscopic members, and 70% at least ten. The shape of the GSMF seems not to depend on environment (field versus G&C) or X-ray luminosity (used as a proxy for the virial mass of the system). These results are confirmed by the study of the correlation between mean stellar mass of G&C members and L^XXL _500,scal. We release the spectrophotometric catalogue of galaxies with all the quantities computed in this work. Conclusions. As a first homogeneous census of galaxies within X-ray spectroscopically confirmed G&C at these redshifts, this sample will allow environmental studies of the evolution of galaxy properties.

Item Type: Article
Keywords: X-rays: galaxies: clusters; galaxies: groups: general; galaxies: clusters: general; galaxies: luminosity function, mass function; galaxies: evolution
Date: 20 November 2018
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © ESO 2018; Received 28 February 2017; Accepted 27 September 2017; Published online 20 November 2018
Divisions: Faculty of Science > Department of Physics
Publisher: EDP Sciences
Depositing User: Vernesa Smolčić
Date Deposited: 03 May 2019 10:24
Last Modified: 06 May 2019 12:41

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