Статья

CFHTLenS: weak lensing calibrated scaling relations for low-mass clusters of galaxies

K. KettulaDepartment of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, FinlandS. GiodiniLeiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the NetherlandsEdo van UitertArgelander-Institut fr Astronomie, Auf dem Hgel 71, D-53121 Bonn, GermanyHenk HoekstraLeiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the NetherlandsA. FinoguenovDepartment of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, FinlandM. LerchsterDepartment of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, FinlandT. ErbenArgelander-Institut fr Astronomie, Auf dem Hgel 71, D-53121 Bonn, GermanyCatherine HeymansScottish Universities Physics Alliance, Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UKH. HildebrandtArgelander-Institut fr Astronomie, Auf dem Hgel 71, D-53121 Bonn, GermanyThomas KitchingMullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UKAndisheh MahdaviDepartment of Physics and Astronomy, San Francisco State University, 1600 Holloway Avenue, San Francisco, CA 94132, USAY. MellierCNRS, UMR 7095, Institut dAstrophysique de Paris, F-75014 Paris, FranceL. MillerDepartment of Physics, Oxford University, Keble Road, Oxford OX1 3RH, UKM. MirkazemiMax-Planck-Institut fr Extraterrestrische Physik, Giessenbachstra e, D-85740 Garching, GermanyLudovic Van WaerbekeDepartment of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, CanadaJ. CouponAstronomical Observatory of the University of Geneva, ch. dEcogia 16, CH-1290 Versoix, SwitzerlandE. EgamiSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USALiping FuShanghai Key Lab for Astrophysics, Shanghai Normal University, 100 Guilin Road, 200234 Shanghai, ChinaMichael J. HudsonDepartment of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, CanadaJean‐Paul KneibLaboratoire d'Astrophysique de Marseille, CNRS-Universit, Ple de l'Etoile Site de Chteau-Gombert 38, rue Frdric Joliot-Curie, F-1338 Marseille, FranceKonrad KuijkenLeiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the NetherlandsH. J. McCrackenCNRS, UMR 7095, Institut dAstrophysique de Paris, F-75014 Paris, FranceM. J. PereiraInstitute of Astronomy and Astrophysics, Academia Sinica, PO Box 23-141, Taipei 10617, TaiwanBarnaby RoweCalifornia Institute of Technology, 1200 E California Boulevard, Pasadena, CA 91125, USAT. SchrabbackLeiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the NetherlandsM. TanakaNational Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka, Tokyo 181-8588, JapanM. VelanderLeiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands

2015en

ABI

Аннотация

We present weak lensing and X-ray analysis of 12 low-mass clusters from the Canada-France-Hawaii Telescope Lensing Survey and XMM-CFHTLS surveys. We combine these systems with high-mass systems from Canadian Cluster Comparison Project and low-mass systems from Cosmic Evolution Survey to obtain a sample of 70 systems, spanning over two orders of magnitude in mass. We measure core-excised L X -T X , M-L X and M-T X scaling relations and include corrections for observational biases. By providing fully bias-corrected relations, we give the current limitations for L X and T X as cluster mass proxies. We demonstrate that T X benefits from a significantly lower intrinsic scatter at fixed mass than L X . By studying the residuals of the bias-corrected relations, we show for the first time using weak lensing masses that galaxy groups seem more luminous and warmer for their mass than clusters. This implies a steepening of the M-L X and M-T X relations at low masses. We verify the inferred steepening using a different high-mass sample from the literature and show that variance between samples is the dominant effect leading to discrepant scaling relations. We divide our sample into subsamples of merging and relaxed systems, and find that mergers may have enhanced scatter in lensing measurements, most likely due to stronger triaxiality and more substructure. For the L X -T X relation, which is unaffected by lensing measurements, we find the opposite trend in scatter. We also explore the effects of X-ray cross-calibration and find that Chandra calibration leads to flatter L X -T X and M-T X relations than XMM-Newton.

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Идентификаторы

DOI: 10.1093/mnras/stv923

Цитирования и источники

Цитирований: 3Использованных источников: 0

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