Статья

The XXL Survey

V. GuglielmoAix Marseille Univ., CNRS, CNES, LAM, Marseille, FranceB. M. PoggiantiINAF – Osservatorio astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, ItalyB. VulcaniINAF – Osservatorio astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, ItalyA. MorettiINAF – Osservatorio astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, ItalyJ. FritzF. GastaldelloINAF – Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, Via Bassini 15, 20133 Milan, ItalyC. AdamiAix Marseille Univ., CNRS, CNES, LAM, Marseille, FranceC. A. CarettaDepartamento de Astronomìa, DCNE-CGT, Universidad de Guanajuato; Callejón de Jalisco, S/N, Col. Valenciana, 36240 Guanajuato, Gto., MexicoJ. WillisSchool of Physics, HH Wills Physics Laboratory, Tyndall Avenue, Bristol GB-BS8 1TL, UKE. KoulouridisAIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, FranceM. E. Ramos CejaArgelander Institut für Astronomie, Universität Bonn, Auf dem Huegel 71, 53121 Bonn, GermanyP. GilesSchool of Physics, HH Wills Physics Laboratory, Tyndall Avenue, Bristol GB-BS8 1TL, UKI. BaldryAstrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool GB-L3 5RF, UKM. BirkinshawSchool of Physics, HH Wills Physics Laboratory, Tyndall Avenue, Bristol GB-BS8 1TL, UKA. BongiornoINAF – Osservatorio Astronomico di Roma, via Frascati 33, 00078 Monte Porzio Catone (Rome), ItalyM. BrownSchool of Physics and Astronomy, Monash University, Clayton, Victoria 3800, AustraliaL. ChiappettiINAF – Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, Via Bassini 15, 20133 Milan, ItalyS. DriverInternational Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, M468, 35 Stirling Highway, Crawley, 6009, AustraliaA. ElyivDipartimento di Fisica e Astronomia, Alma Mater Studiorum - Università di Bologna, via Gobetti 93/3, 40129 Bologna, ItalyA. EvrardDepartment of Physics and Michigan Center for Theoretical Physics, University of Michigan, Ann Arbor, MI 48109, USAM. GrootesESA/ESTEC, Noordwijk 2201 AZ, The NetherlandsL. GuennouAstrophysics and Cosmology Research Unit, University of KwaZulu-Natal, 4041 Durban, South AfricaA. HopkinsAustralian Astronomical Observatory, PO BOX 915, North Ryde 1670, AustraliaC. HorellouDepartment of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, SwedenA. IovinoINAF – Osservatorio Astronomico di Brera, via Brera, 28, 20121 Milano, ItalyS. MaurogordatoLaboratoire Lagrange, UMR 7293, Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, 06304 Nice, FranceM. OwersDepartment of Physics and Astronomy, Macquarie University, NSW 2109, Australia and Australian Astronomical Observatory PO Box 915, North Ryde NSW 1670, AustraliaF. PacaudArgelander Institut für Astronomie, Universität Bonn, Auf dem Huegel 71, 53121 Bonn, GermanyS. PaltaniDepartment of Astronomy, University of Geneva, ch. d’Ecogia 16, 1290 Versoix, SwitzerlandM. PierreAIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, FranceM. PlionisIAASARS, National Observatory of Athens, 15236 Penteli, GreeceT. PonmanSchool of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham GB-B15 2TT, UKA. RobothamInternational Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, M468, 35 Stirling Highway, Crawley, 6009, AustraliaT. SadibekovaUlugh Beg Astronomical Institute of Uzbekistan Academy of Science, 33 Astronomicheskaya str., Tashkent 100052, UzbekistanV. SmolčićDepartment of Physics, University of Zagreb, Bijenicka cesta 32, 10000 Zagreb, CroatiaR. TuffsESA/ESTEC, Noordwijk 2201 AZ, The NetherlandsC. VignaliDipartimento di Fisica e Astronomia, Alma Mater Studiorum - Università di Bologna, via Gobetti 93/3, 40129 Bologna, Italy

Astronomy and Astrophysicsjournal2018en

ABI

Аннотация

Context. Superclusters form from the largest enhancements in the primordial density perturbation field and extend for tens of Mpc, tracing the large-scale structure of the Universe. X-ray detections and systematic characterisations of superclusters and the properties of their galaxies have only been possible in the last few years. Aims. We characterise XLSSsC N01, a rich supercluster at z ~ 0.3 detected in the XXL Survey, composed of X-ray clusters of different virial masses and X-ray luminosities. As one of the first studies on this topic, we investigate the stellar populations of galaxies in different environments in the supercluster region. Methods. We study a magnitude-limited ( r ≤ 20) and a mass-limited sample (log( M * ∕ M ⊙ ) ≥ 10.8) of galaxies in the virialised region and in the outskirts of 11 XLSSsC N01 clusters, in high-density field regions, and in the low-density field. We compute the stellar population properties of galaxies using spectral energy distribution (SED) and spectral fitting techniques, and study the dependence of star formation rates (SFR), colours, and stellar ages on environment. Results. For r ≤ 20, the fraction of star-forming/blue galaxies, computed either from the specific-SFR (sSFR) or rest-frame colour, shows depletion within the cluster virial radii, where the number of galaxies with log (sSFR/ yr −1 ) > −12 and with ( g − r ) restframe < 0.6 is lower than in the field. For log( M * ∕ M ⊙ ) ≥ 10.8, no trends with environment emerge, as massive galaxies are mostly already passive in all environments. No differences among low- and high-density field members and cluster members emerge in the sSFR-mass relation in the mass-complete regime. Finally, the luminosity-weighted age–mass relation of the passive populations within cluster virial radii show signatures of recent environmental quenching. Conclusions. The study of luminous and massive galaxies in this supercluster shows that while environment has a prominent role in determining the fractions of star-forming/blue galaxies, its effects on the star formation activity in star-forming galaxies are negligible.

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Темы

Galaxies: Formation, Evolution, Phenomena Astronomy and Astrophysical Research Scientific Research and Discoveries

Идентификаторы

DOI: 10.1051/0004-6361/201732507

Цитирования и источники

Цитирований: 1 Использованных источников: 119

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