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Author : Siwei Zou
Publisher :
ISBN 13 :
Total Pages : 97 pages
Book Rating : 4.:/5 (931 download)
Download or read book X-ray Scaling Relations of the 400d Low-mass Galaxy Clusters written by Siwei Zou and published by . This book was released on 2015 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nicola Mehrtens
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (89 download)
Download or read book The NOAO-XCS Survey & the Optical to X-ray Scaling Relations of Galaxy Clusters written by Nicola Mehrtens and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W.C. Seitter
Publisher : Springer Science & Business Media
ISBN 13 : 9401110220
Total Pages : 500 pages
Book Rating : 4.4/5 (11 download)
Download or read book Cosmological Aspects of X-Ray Clusters of Galaxies written by W.C. Seitter and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NATO Advanced Study Institute "Cosmological Aspects of X-Ray Clus ters of Galaxies" took place in Vel en , Westphalia, Germany, from June 6 to June 18, 1993. It addressed the fruitful union of two topics, cosmology and X-ray clus ters, both of which carry substantial scientific weight at the beginning of the last decenium of the last century in the second millenium of our era. The so far largest X-ray "All-Sky Survey", observed by the ROSAT X-ray satel lite, and ROSAT's deep pointed observations, have considerably enlarged the base of X-ray astronomy, particularly concerning extragalactic sources. Cosmology has gained significant impetus from the large optical direct and spectroscopic surveys, based on high quality 2-dimensional receivers at large telescopes and powerful scan ning devices, harvesting the full information 1 content from the older technique of employing photographic plates. Radioastronomy and IR-astronomy with IRAS, as well as r-astronomy with GRO, continue and strengthen the role of extragalactic research. The rapidly growing computer power in data reduction and data storage facilities support the evolution towards large-number statistics. A most significant push was given to early cosmology by the needs of physics in trying to unravel the nature of forces which govern our material world. The topic of the ASI was chosen because it opens new vistas on this for ever new problem: the universe. Clusters of galaxies probe large-scale matter distributions and the structure of space-time.
Author : Alberto Doria
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)
Download or read book Weak Lensing-X-ray Scaling Relations for a High Redshift Galaxy Clusters Sample written by Alberto Doria and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alberto Doria
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (1 download)
Download or read book Weak Lensing-X-ray Scaling Relations for a High Redshift Galaxy Clusters Sample written by Alberto Doria and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Holger Israel
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (837 download)
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:
Author : John Joseph Bialek
Publisher :
ISBN 13 :
Total Pages : 286 pages
Book Rating : 4.3/5 (91 download)
Download or read book Properties of Preheated Galaxy Clusters written by John Joseph Bialek and published by . This book was released on 2005 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Holger Israel
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.:/5 (725 download)
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:
Download or read book Measurement of Galaxy Cluster Integrated Comptonization and Mass Scaling Relations with the South Pole Telescope written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe a method for measuring the integrated Comptonization (Y (SZ)) of clusters of galaxies from measurements of the Sunyaev-Zel'dovich (SZ) effect in multiple frequency bands and use this method to characterize a sample of galaxy clusters detected in the South Pole Telescope (SPT) data. We use a Markov Chain Monte Carlo method to fit a [beta]-model source profile and integrate Y (SZ) within an angular aperture on the sky. In simulated observations of an SPT-like survey that include cosmic microwave background anisotropy, point sources, and atmospheric and instrumental noise at typical SPT-SZ survey levels, we show that we can accurately recover [beta]-model parameters for inputted clusters. We measure Y (SZ) for simulated semi-analytic clusters and find that Y (SZ) is most accurately determined in an angular aperture comparable to the SPT beam size. We demonstrate the utility of this method to measure Y (SZ) and to constrain mass scaling relations using X-ray mass estimates for a sample of 18 galaxy clusters from the SPT-SZ survey. Measuring Y (SZ) within a 0.'75 radius aperture, we find an intrinsic log-normal scatter of 21% ± 11% in Y (SZ) at a fixed mass. Measuring Y (SZ) within a 0.3 Mpc projected radius (equivalent to 0.'75 at the survey median redshift z = 0.6), we find a scatter of 26% ± 9%. Prior to this study, the SPT observable found to have the lowest scatter with mass was cluster detection significance. We demonstrate, from both simulations and SPT observed clusters that Y (SZ) measured within an aperture comparable to the SPT beam size is equivalent, in terms of scatter with cluster mass, to SPT cluster detection significance.
Author : Kivanc Sabirli
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)
Download or read book Confirmation of Self-similar Evolution in the X-ray Luminosity - Temperature Scaling Relation of Clusters of Galaxies written by Kivanc Sabirli and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : En-Hsin Peng
Publisher :
ISBN 13 :
Total Pages : 163 pages
Book Rating : 4.:/5 (827 download)
Download or read book Mass Profiles of Clusters of Galaxies written by En-Hsin Peng and published by . This book was released on 2011 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clusters of galaxies are useful probes of cosmology because they are the most massive bound systems and fair representatives of the matter composition of the universe. For clusters to be used as tracers of cosmic evolution, one must determine their masses with high accuracy. In this thesis, we provide a detailed comparison of mass estimates from X-rays and weak gravitational lensing for a sample of 32 intermediate low redshift clusters, and study the dependence of the mass profiles derived from these techniques on the dynamical state of the clusters. We analyze Chandra X-ray observations and compare the X-ray masses with published weak lensing data (Hoekstra, 2007; Okabe et al., 2010). The temperature, gas density, pressure, gas fraction profiles and their relation to the cluster morphology are also examined. We find that slopes of X-ray pressure and mass profiles vary with cluster morphology. Specifically, clusters with lower third-order power ratios P3=P0 (more relaxed) have the steepest profiles while high P3/P0 clusters (more disturbed) have the attest ones. The same trend is not obvious in weak lensing data. Consequently, a correlation between P3/P0 and the mass ratio of X-ray to weak lensing estimates MX/MWL, which in principle indicates the level of non-thermal pressure component in clusters, is found. For the entire sample, we find MX/MWL = 1.14±0.12 at R2500 (at 68% confidence). For apparently unrelaxed, high P3/P0 clusters, we find MX/MWL = 0.96 ± 0.12 at the same radius. For apparently relaxed, low P3/P0 clusters, we find MX/MWL = 1.32 ± 0.17, instead of MX/MWL = 1, expected if these clusters are in hydrostatic equilibrium. This may imply that the gas is hotter than the dark matter in cluster central regions (Rasia et al., 2004)..
Author : Sheona Anne Urquhart
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (88 download)
Download or read book Galaxy Evolution in a Large Sample of X-ray Clusters written by Sheona Anne Urquhart and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It is long established that the evolution of populations of galaxies is dependent upon the environment in which they are located, from low mass galaxy groups to rich galaxy clusters. However, what is not so clear is which physical process(es) dominate this evolution. There are a number of different mechanisms which have been proposed and these can be broadly divided into two categories. There are those caused by interactions with the cluster environment itself (including ram-pressure stripping) and those caused by galaxy-galaxy interactions (including merging events). Disentangling these is a non-trivial task. In this thesis, we use a number of parameters to do so all based upon our uniform CFHT Megacam photometry for X-ray selected galaxy clusters drawn from the X-Ray Multi-Mirror (XMM) Large Scale Structure (LSS) survey and the Canadian Cluster Comparison Project (CCCP). These clusters possess well determined X-ray temperatures spanning the range 1
Author : Robert Raymond Lindner
Publisher :
ISBN 13 :
Total Pages : 231 pages
Book Rating : 4.:/5 (91 download)
Download or read book The Growth of Massive Galaxies and Clusters at High Redshift written by Robert Raymond Lindner and published by . This book was released on 2013 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Massive galaxies and galaxy clusters gain much of their mass by merging with their neighbors; this hierarchical structure formation is the foundation of our understanding of galaxy evolution. Nevertheless, the detailed evolutionary processes needed to form the structures we see in the local Universe remain poorly understood. This thesis comprises four projects examining the growth of galaxies and clusters at high redshift by using radio, sub/millimeter, and X-ray observations to provide empirical constraints on their cosmic evolution. Chapter 2 presents deep 1.2mm imaging of the inner 20' x 20' of the Lockman Hole North (LHN) field to search for submillimeter galaxies (SMGs), rapidly star-forming, high-redshift galaxy mergers. We detect 41 SMGs with S/N>4.0 and use Monte Carlo simulations to estimate their number counts and angular clustering properties. Chapter 3 investigates the nuclear accretion properties of the LHN SMGs. In the sample's average rest-frame X-ray spectrum, we detect strong Fe K alpha emission (equivalent width EW>=1 keV) from highly-ionized Fe species -- evidence that beneath the galaxies' heavy obscuration, supermassive black holes may be growing rapidly. Chapter 4 describes a new 345 GHz and 2.1 GHz imaging campaign to study the intracluster media (ICM) of eleven massive Sunyaev Zel'dovich Effect (SZE)-detected clusters from the Atacama Cosmology Telescope (ACT) southern survey. In six of eleven, 345 GHz SZE increments are detected and used to characterize the spatial distribution and energy content of the ICM at high (19.2") resolution. This work helps us understand how SZE-mass scaling relations are affected by contamination from other sources along the line of sight and by dynamical properties of the ICM. Chapter 5 studies the non-thermal radio emission in one exceptional z=0.870 binary cluster merger (ACTJ0102-4915, ``El Gordo'') with the help of newly-acquired radio observations. El Gordo is the highest-redshift cluster known to host double radio ``relics'' and a radio ``halo, '' and by characterizing the morphology, intensity, spectral index, and polarization of these structures, we extend our knowledge of ICM shocks and magnetic fields to an era when the Universe was only 50% its current age.
Author : Manuel Oliver Stubbe
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (968 download)
Download or read book Scaling relations in clusters of galaxies written by Manuel Oliver Stubbe and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Remo Ruffini
Publisher : World Scientific
ISBN 13 : 9814458031
Total Pages : 2657 pages
Book Rating : 4.8/5 (144 download)
Download or read book Twelfth Marcel Grossmann Meeting, The: On Recent Developments In Theoretical And Experimental General Relativity, Astrophysics And Relativistic Field Theories (In 3 Volumes) - Proceedings Of The Mg12 Meeting On General Relativity written by Remo Ruffini and published by World Scientific. This book was released on 2012-02-02 with total page 2657 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marcel Grossmann Meetings are formed to further the development of General Relativity by promoting theoretical understanding in the fields of physics, mathematics, astronomy and astrophysics and to direct future technological, observational, and experimental efforts. In these meetings are discussed recent developments in classical and quantum gravity, general relativity and relativistic astrophysics, with major emphasis on mathematical foundations and physical predictions, with the main objective of gathering scientists from diverse backgrounds for deepening the understanding of spacetime structure and reviewing the status of test-experiments for Einstein's theory of gravitation. The range of topics is broad, going from the more abstract classical theory, quantum gravity and strings, to the more concrete relativistic astrophysics observations and modeling.The three volumes of the proceedings of MG12 give a broad view of all aspects of gravitational physics and astrophysics, from mathematical issues to recent observations and experiments. The scientific program of the meeting includes 29 plenary talks stretched over 6 mornings, and 74 parallel sessions over 5 afternoons. Volume A contains plenary and review talks ranging from the mathematical foundations of classical and quantum gravitational theories including recent developments in string theories, to precision tests of general relativity including progress towards the detection of gravitational waves, to relativistic astrophysics including such topics as gamma ray bursts, black hole physics both in our galaxy, in active galactic nuclei and in other galaxies, neutron stars, pulsar astrophysics, gravitational lensing effects, neutrino physics and ultra high energy cosmic rays. The rest of the volumes include parallel sessions on dark matter, neutrinos, X-ray sources, astrophysical black holes, neutron stars, binary systems, radiative transfer, accretion disks, alternative gravitational theories, perturbations of collapsed objects, analog models, black hole thermodynamics, cosmic background radiation & observational cosmology, numerical relativity & algebraic computing, gravitational lensing, variable ';constants'; of nature, large scale structure, topology of the universe, brane-world cosmology, early universe models & cosmic microwave background anisotropies, inhomogeneous cosmology, inflation, gamma ray burst modeling, supernovas, global structure, singularities, cosmic censorship, chaos, Einstein-Maxwell systems, inertial forces, gravitomagnetism, wormholes & time machines, exact solutions of Einstein's equations, gravitational waves, gravitational wave detectors & data analysis, precision gravitational measurements, history of relativity, quantum gravity & loop quantum gravity, Casimir effect, quantum cosmology, strings & branes, self-gravitating systems, gamma ray astronomy, cosmic rays, gamma ray bursts and quasars.
Author : Susan Wilson
Publisher :
ISBN 13 :
Total Pages : 522 pages
Book Rating : 4.:/5 (14 download)
Download or read book Evolution of Galaxy Cluster Scaling Relations Over Half a Hubble Time written by Susan Wilson and published by . This book was released on 2016 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (16 download)
Download or read book The L_X-M Relation of Clusters of Galaxies written by and published by . This book was released on 2008 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new measurement of the scaling relation between X-ray luminosity and total mass for 17,000 galaxy clusters in the maxBCG cluster sample. Stacking sub-samples within fixed ranges of optical richness, N200, we measure the mean 0.1-2.4 keV X-ray luminosity, L{sub X}, from the ROSAT All-Sky Survey. The mean mass, M200, is measured from weak gravitational lensing of SDSS background galaxies (Johnston et al. 2007). For 9 ≤ N200 200, the data are well fit by a power-law, L{sub X}/1042 h−2 ergs−1 = (12.6{sub -1.3}{sup +1.4}(stat) ± 1.6 (sys)) (
