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Weak Lensing Mass Determination Of Eight X Ray Selected Galaxy Clusters From The 400d Survey
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Book Synopsis Weak Lensing Mass Determination of Eight X-ray Selected Galaxy Clusters from the 400d Survey by : Holger Israel
Download or read book Weak Lensing Mass Determination of Eight X-ray Selected Galaxy Clusters from the 400d Survey written by Holger Israel and published by . This book was released on 2011 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Weak Lensing Mass Determination of Eight X-ray Selected Galaxy Clusters from the 400d Surve by : Holger Israel
Download or read book Weak Lensing Mass Determination of Eight X-ray Selected Galaxy Clusters from the 400d Surve written by Holger Israel and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Weak-lensing Mass Calibration of RedMaPPer Galaxy Clusters in Dark Energy Survey Science Verification Data by :
Download or read book Weak-lensing Mass Calibration of RedMaPPer Galaxy Clusters in Dark Energy Survey Science Verification Data written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We use weak-lensing shear measurements to determine the mean mass of optically selected galaxy clusters in Dark Energy Survey Science Verification data. In a blinded analysis, we split the sample of more than 8,000 redMaPPer clusters into 15 subsets, spanning ranges in the richness parameter $5 \leq \lambda \leq 180$ and redshift $0.2 \leq z \leq 0.8$, and fit the averaged mass density contrast profiles with a model that accounts for seven distinct sources of systematic uncertainty: shear measurement and photometric redshift errors; cluster-member contamination; miscentering; deviations from the NFW halo profile; halo triaxiality; and line-of-sight projections. We combine the inferred cluster masses to estimate the joint scaling relation between mass, richness and redshift, $\mathcal{M}(\lambda, z) \varpropto M_0 \lambda^{F} (1+z)^{G}$. We find $M_0 \equiv \langle M_{200\mathrm{m}}\,
Book Synopsis The Properties of X-ray and Weak Lensing Selected Galaxy Clusters by :
Download or read book The Properties of X-ray and Weak Lensing Selected Galaxy Clusters written by and published by . This book was released on 2012 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cluster Mass Calibration at High Redshift by :
Download or read book Cluster Mass Calibration at High Redshift written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an HST/ACS weak gravitational lensing analysis of 13 massive high-redshift (z_median=0.88) galaxy clusters discovered in the South Pole Telescope (SPT) Sunyaev-Zel'dovich Survey. This study is part of a larger campaign that aims to robustly calibrate mass-observable scaling relations over a wide range in redshift to enable improved cosmological constraints from the SPT cluster sample. We introduce new strategies to ensure that systematics in the lensing analysis do not degrade constraints on cluster scaling relations significantly. First, we efficiently remove cluster members from the source sample by selecting very blue galaxies in V-I colour. Our estimate of the source redshift distribution is based on CANDELS data, where we carefully mimic the source selection criteria of the cluster fields. We apply a statistical correction for systematic photometric redshift errors as derived from Hubble Ultra Deep Field data and verified through spatial cross-correlations. We account for the impact of lensing magnification on the source redshift distribution, finding that this is particularly relevant for shallower surveys. Finally, we account for biases in the mass modelling caused by miscentring and uncertainties in the mass-concentration relation using simulations. In combination with temperature estimates from Chandra we constrain the normalisation of the mass-temperature scaling relation ln(E(z) M_500c/10^14 M_sun)=A+1.5 ln(kT/7.2keV) to A=1.81^{+0.24}_{-0.14}(stat.) +/- 0.09(sys.), consistent with self-similar redshift evolution when compared to lower redshift samples. Additionally, the lensing data constrain the average concentration of the clusters to c_200c=5.6^{+3.7}_{-1.8}.
Book Synopsis Constraining the Scatter in the Mass-Richness Relation of MaxBCG Clusters With Weak Lensing and X-ray Data by :
Download or read book Constraining the Scatter in the Mass-Richness Relation of MaxBCG Clusters With Weak Lensing and X-ray Data written by and published by . This book was released on 2009 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the logarithmic scatter in mass at fixed richness for clusters in the maxBCG cluster catalog, an optically selected cluster sample drawn from SDSS imaging data. Our measurement is achieved by demanding consistency between available weak lensing and X-ray measurements of the maxBCG clusters, and the X-ray luminosity-mass relation inferred from the 400d X-ray cluster survey, a flux limited X-ray cluster survey. We find [sigma]{sub lnM.
Book Synopsis Galaxy Cluster Center Detection Methods with Weak Lensing by : Melanie Simet
Download or read book Galaxy Cluster Center Detection Methods with Weak Lensing written by Melanie Simet and published by . This book was released on 2012 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The precise location of galaxy cluster centers is a persistent problem in weak lensing mass estimates and in interpretations of clusters in a cosmological context. In this work, we test methods of centroid determination from weak lensing data and examine the effects of such self-calibration on the measured masses. Drawing on lensing data from the Sloan Digital Sky Survey Stripe 82, a 275 square degree region of coadded data in the Southern Galactic Cap, together with a catalog of MaxBCG clusters, we show that halo substructure as well as shape noise and stochasticity in galaxy positions limit the precision of such a self-calibration (in the context of Stripe 82, to ∼ 500 h−1 kpc or larger) and bias the mass estimates around these points to a level that is likely unacceptable for the purposes of making cosmological measurements. We also project the usefulness of this technique in future surveys.
Book Synopsis The Accuracy of Mass Determination in Galaxy Clusters by X-ray Observations by : Sabine Schindler
Download or read book The Accuracy of Mass Determination in Galaxy Clusters by X-ray Observations written by Sabine Schindler and published by . This book was released on 1995 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Weak Lensing Flexion as a Probe of Galaxy Cluster Substructure by : Benjamin Martin Cain
Download or read book Weak Lensing Flexion as a Probe of Galaxy Cluster Substructure written by Benjamin Martin Cain and published by . This book was released on 2011 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measuring galaxy cluster total masses and the amount of dark matter substructure within galaxy cluster haloes is a fundamental probe of the ACDM model of structure formation, as well as the interactions between baryonic and non-baryonic matter. In this thesis I approach the topic of cluster mass structure in two ways. With a combination of optical imaging, spectroscopy, and X-ray observations I determine that the cluster RCS043938-2904.7, while apparently anomalous initially due to its high optical richness and low X-ray surface brightness, is in fact an association of structures along the line of sight. Accounting for this structure brings the observed cluster properties into agreement with known scaling relations. I also present a novel method for measuring weak gravitational lensing flexion to inform mass measurements on small scales. While previously published methods for measuring flexion focus on measuring derived properties of the lensed images, such as shapelet coefficients or surface brightness moments, my method fits a fully mass-sheet-invariant parametrized Analytic Image Model (AIM) to the each galaxy image. This simple parametric model traces the distortion of lensed image isophotes. I tested the AIM method using simulated data images with realistic noise and a variety of input image properties, and I show that it successfully reproduces the input lensing fields. I also apply the AIM method for flexion measurement to Hubble Space Telescope observations of Abell 1689, and detect mass structure in that cluster using only flexion measured with the AIM method.
Book Synopsis The Exoplanet Handbook by : Michael Perryman
Download or read book The Exoplanet Handbook written by Michael Perryman and published by Cambridge University Press. This book was released on 2018-08-30 with total page 973 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete and in-depth review of exoplanet research, covering the discovery methods, physics and theoretical background.
Book Synopsis Impact of Gravitational Lensing on Cosmology (IAU S225) by : International Astronomical Union. Symposium
Download or read book Impact of Gravitational Lensing on Cosmology (IAU S225) written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2005-09-05 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the International Astronomical Union Symposium no. 225, held in July 2004 at the Ecole Polytechnique Federale de Lausanne (EPFL), in Lausanne, Switzerland. The meeting focused on the applications of gravitational lensing to cosmological physics, and this book summarizes the most recent theoretical and observational developments. With chapters written by leading scientists in the field, this is a valuable resource for professional astronomers and graduate students in astronomy, physics and astro-particle physics.
Book Synopsis Topics in Gravitational Dynamics by : Daniel Benest
Download or read book Topics in Gravitational Dynamics written by Daniel Benest and published by Springer. This book was released on 2007-12-14 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This set of lectures collects surveys of open problems in celestial dynamics and dynamical astronomy applied to solar, extra-solar and galactic systems. The discovery and thus the possibility to study many new extra-solar planetary systems have spurred new developments in the field and enabled the testing and enlargement of the domains of validity of theoretical predictions through the Nekhoroshev theorem.
Book Synopsis Galaxy Formation and Evolution by : Houjun Mo
Download or read book Galaxy Formation and Evolution written by Houjun Mo and published by Cambridge University Press. This book was released on 2010-05-20 with total page 841 pages. Available in PDF, EPUB and Kindle. Book excerpt: A coherent introduction for researchers in astronomy, particle physics, and cosmology on the formation and evolution of galaxies.
Author :International Astronomical Union. Symposium Publisher :Springer Science & Business Media ISBN 13 :9789027727442 Total Pages :662 pages Book Rating :4.7/5 (274 download)
Book Synopsis Large Scale Structures of the Universe by : International Astronomical Union. Symposium
Download or read book Large Scale Structures of the Universe written by International Astronomical Union. Symposium and published by Springer Science & Business Media. This book was released on 1988-07-31 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 130th Symposium of the International Astronomical Union, dedicated to the memory of Marc A. Aaronson (1950-1987), held in Balatonfured, Hungary, June 15-20, 1987
Book Synopsis The Physical Properties of the Groups of Galaxies by : Lorenzo Lovisari
Download or read book The Physical Properties of the Groups of Galaxies written by Lorenzo Lovisari and published by . This book was released on 2021 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxy groups consist of a few tens of galaxies bound in a common gravitational potential and contain a significant fraction of the overall universal baryon budget. Therefore, they are key to our understanding of how the bulk of matter in the Universe accretes and forms hierarchical structures and how different sources of feedback affect their gravitational collapse. However, despite their crucial role in cosmic structure formation and evolution, galaxy groups have received less attention compared to massive clusters. This is perhaps in part due to their rarity in being observed and properly characterized. With the advent of eROSITA, many thousands of galaxy groups will be detected by X-ray, complementing optical and SZ coverage. In this Special Issue we collected and organized the latest developments in our understanding of these systems and present future prospects from both observational and theoretical points of view.
Book Synopsis The Canning Basin, W.A. by : Peter G. Purcell
Download or read book The Canning Basin, W.A. written by Peter G. Purcell and published by . This book was released on 1984 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutrino Cosmology by : Julien Lesgourgues
Download or read book Neutrino Cosmology written by Julien Lesgourgues and published by Cambridge University Press. This book was released on 2013-02-21 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: A self-contained guide to the role played by neutrinos in the Universe and how their properties influence cosmological and astrophysical observations.
