Author: 林征發Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Multi-wavelength Properties, Luminosity Functions, and Clustering Measurements of 450-mm-selected Galaxies
Author: 林征發A Multi-wavelength Study of Optically Selected Galaxy Clusters from the Blanco Cosmology Survey
Author: Lindsey Ellen BleemPublisher:
ISBN: 9781303422362
Category :
Languages : en
Pages : 117
Book Description
Abundance measurements of galaxy clusters provide powerful constraints of cosmology. The observed distribution of clusters can potentially be used to disentangle whether the accelerated cosmic expansion can be explained by a modification to Einstein's theory of gravity or whether the explanation involves a new form of 'dark' energy. Such growth of structure measurements are both complementary to and provide an important cross-check of measurements of the geometry of the universe. There are two key requirements for cosmology with galaxy clusters: a census of these systems through cosmic time and the ability to connect the measured signal with the underlying mass of the galaxy cluster. In this era of large-area millimeter and optical wavelength surveys (including the South Pole Telescope (SPT) 2500-square-degree SZ-Survey and the Dark Energy Survey (DES)) where hundreds (mm-wave) to hundreds of thousands (optical) of clusters will be detected, the most serious limitation to cluster cosmology remains understanding and calibrating observable-mass relations. Combining cluster observables across wavelengths can both test and inform our knowledge of such scaling relations. As a pilot program for future explorations of the combined SPT and DES datasets, we explore the relation between the optical-richness, lambda, and SZ-signal for a sample of 567 optically-selected clusters from the Blanco Cosmology Survey, an ~ 80 square-degree survey located within the SPT-SZ survey. In this study we detect SZ-signal at increasing significance as a function of cluster richness but find that the recovered signal falls below expectations derived from models based on X-ray samples. We explore possible biases to our recovered signal and find that contamination from cluster members -- in particular radio and dust emission from galaxies--is small and that the majority of the discrepancy at the high mass end can be explained by errors in identifying the optical centers of clusters. The toolset developed here can be combined with future cluster catalogs from the Dark Energy Survey to help improve mass-richness scaling relations and ultimately constrain cosmological models.
Multi-wavelength Properties of Submillimeter-selected Galaxies
Author: Laura Jeannine HainlinePublisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 450
Book Description
Quantifying the Physical Properties of High-redshift Galaxies
Author: Sara Michelle PettyPublisher:
ISBN: 9781109633344
Category : Galaxies
Languages : en
Pages : 173
Book Description
I demonstrate that multi-wavelength analysis is fundamental to the understanding of galaxy evolution. I determined that G-M20 values of Balmer-break galaxies are more bulge-like in the rest-frame optical than z & sim; 1 and 4 starburst galaxies in the UV. I conclude that the Balmer-break selected galaxies are probably progenitors to local early type galaxies.
Multi-wavelength Analysis of the Physical Properties of Distant Galaxies
Author: Multiwavelength Properties of a 12-micron Selected Sample of Seyfert Galaxies
Author: Brian RushCharacterizing the Properties of Clusters of Galaxies As a Function of Luminosity and Redshift
Author: Multi-wavelength Observations of Galaxy Clusters
Author: Thomas Patrick ConnorPublisher:
ISBN: 9781369051322
Category : Electronic dissertations
Languages : en
Pages : 200
Book Description
X-Ray Emission from Clusters of Galaxies
Author: Craig L. SarazinPublisher: Cambridge University Press
ISBN: 9780521329576
Category : Science
Languages : en
Pages : 0
Book Description
First published in 1988, this book is a comprehensive survey of the astrophysical characteristics of the hot gas which pervades clusters of galaxies. In our universe, clusters of galaxies are the largest organised structures. Typically they comprise hundreds of galaxies moving through a region of space ten million light years in diameter. The volume between the galaxies is filled with gas having a temperature of 100 million degrees. This material is a strong source of cosmic X-rays. Dr Sarazin describes the theoretical description of the origin, dynamics, and physical state of the cluster gas. Observations by radio and optical telescopes are also summarised. This account is addressed to professional astronomers and to graduate students. It is an exhaustive summary of a rapidly expanding field of research in modern astrophysics.
Galaxies and Cosmology
Author: Francoise COMBESPublisher: Springer Science & Business Media
ISBN: 9783540419273
Category : Science
Languages : en
Pages : 468
Book Description
Unique in its breadth of coverage and level of presentation, this revised textbook provides more on the nature of galaxies, extragalactic objects, the large-scale structure of the Universe, and cosmology than is available in general textbooks on astronomy. It remains, however, accessible to advanced undergraduate students. One or more chapters are devoted to each of the following: the classification and morphology of galaxies; the galactic interstellar medium; galactic kinematics; elliptical, spiral, and barred spiral galaxies; the interactions between galaxies; extragalactic radio sources, quasars and their line spectra, and other active galactic nuclei; the formation of galaxies; the Universe as a whole; and cosmology.