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Author : Anthony Patrick Burford Leonard
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (595 download)
Download or read book Simulating the Lyman-alpha Forest written by Anthony Patrick Burford Leonard and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anthony Patrick Burford Leonard
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Simulating the Lyman-α Forest written by Anthony Patrick Burford Leonard and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Romeel S Davé
Publisher :
ISBN 13 :
Total Pages : 314 pages
Book Rating : 4.:/5 (321 download)
Download or read book The Lyman Alpha Forest in Hierarchical Structure Formation Models written by Romeel S Davé and published by . This book was released on 1998 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yu Zhang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (774 download)
Download or read book Cosmological Hydrodynamic Simulations of the Lyman-alpha Forest written by Yu Zhang and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Several three dimensional, multi-species, cosmological hydrodynamic simulations of the formation and evolution of Ly$alpha$ forest absorbers were performed in three CDM-like cosmological models: the standard CDM model (SCDM), the flat CDM model with a nonzero cosmological constant ($Lambda$CDM) and the open CDM model (OCDM). Synthetic spectra along random lines-of-sight were generated and analyzed by using a powerful spectrum analysis method designed to mimic observational data reduction. The SCDM model was studied in great detail and found to be in excellent agreement with observations in: the slope and shape of the column density distribution, the value and distribution of the Doppler parameter and the equivalent width, the evolution of line density, effective opacity and flux decrement, etc. A number of sensitive tests were devised to compare and contrast different cosmological models, and it is found that both the SCDM and the $Lambda$CDM models agree with observations quite well, while the OCDM model fails to match most of the observational data satisfactorily. It is discovered that the low column density (log $Nsb{HI} simeq$ 13.3 and log $Nsb{HeII} simeq$ 14.5) H sc I and He sc II Ly$alpha$ absorbers which are optically-thin at the line center ($tausb0
Author : Pengfei Chen
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (966 download)
Download or read book The Effect of Inhomogeneous Helium II Reionization on the Lyman Alpha Forest written by Pengfei Chen and published by . This book was released on 2016 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lyman Alpha Forest (LAF) has been extensively studied observationally and by simulations. Good agreement between data and simulations has been reached in some statistics describing the LAF. However, there are still significant discrepancies in the magnitude of the flux power spectrum (FPS) and the shape of the flux probability distribution function (FPDF). Here we explore a possible resolution by adding new physical ingredients into the standard LAF simulations. Firstly, we repeat the standard simulation. Here the intergalactic medium (IGM) is assumed to be photoionized and photoheated by a homogeneous ultraviolet background. Simulations with various box sizes and He II photoheating rates all confirm the mismatch. Then we introduce simulations that treat quasars as point sources, and calculate the radiation transfer using multigroup flux-limited diffusion. Our simulations here fall into two categories. Simulations with larger volumes (126 Mpc/h)3 sample the more luminous quasars and exhibit a more reliable thermal and ionization history. Due to the finite time it takes He III bubbles to expand, our simulations reionize later (z~2.76) than standard simulations, and show better agreement with observations. Simulations with higher spatial resolutions (80 Mpc/h)3 are used to generate synthetic spectra. Our mean H I effective optical depths and rescaled b 's agree with data well, but the discrepancies in FPS and FPDF still exist. We therefore conclude that the inhomogeneous heating due to He II reionization is not the missing physics needed to reconcile simulations with data. We also generate He II LAF spectra and successfully reproduce the large scatter in the He II effective optical depth before He II reionization completes. We also calculate its FPS and FPDF, which could be used to compare with future observations. On a related topic, we conduct simulations of the hydrogen reionization to examine the effect of the smallest galaxies. We find that reionization begins substantially earlier when galaxies in the mass range 10^7
Author : Pran Nath
Publisher : World Scientific Publishing
ISBN 13 : 9814544442
Total Pages : 878 pages
Book Rating : 4.8/5 (145 download)
Download or read book Particles, Strings And Cosmology (Pascos'98) - Proceedings Of The Sixth International Symposium written by Pran Nath and published by World Scientific Publishing. This book was released on 1999-02-04 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume a wide range of topics in particle physics, string theory and cosmology and their interconnections is covered.
Author : Georges Meylan
Publisher : Springer Science & Business Media
ISBN 13 : 3540494588
Total Pages : 481 pages
Book Rating : 4.5/5 (44 download)
Download or read book QSO Absorption Lines written by Georges Meylan and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: The controversial question of whether the majority of the narrow absorption lines observed in QSO spectra represent cosmological intervening systems or ejecta from the QSO themselves is settled. QSO absorption line spectroscopy, initially a mere technique, has matured into an essential extragalactic research tool for understanding the content of the Universe at redshifts between 0 and 4, and beyond. The only previous important meeting devoted to "QSO Absorption Lines" was held in May 1987 at the Space Telescope Science Institute in Baltimore, Maryland, U.S.A. Since that time, nearly a decade ago, research has been ex tremely active in this now well-established field of astrophysics. Theoretical stud ies and simulations have taken advantage of the constant progress in computer technology, and during these last few years, the observational results have bene fited largely from the new facillities offered by the Hubble Space Telescope in the UV wavelength range and the Keck Telescope for high-resolution spectroscopy.
Download or read book The Lyman Alpha Forest in Hierarchical Cosmologies written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The comparison of quasar absorption spectra with numerically simulated spectra from hierarchical cosmological models of structure formation promises to be a valuable tool to discriminate among these models. We present simulation results for the column density, Doppler b parameter, and optical depth probability distributions for five popular cosmological models.
Author : Peter Schneider
Publisher : Springer
ISBN 13 : 364254083X
Total Pages : 637 pages
Book Rating : 4.6/5 (425 download)
Download or read book Extragalactic Astronomy and Cosmology written by Peter Schneider and published by Springer. This book was released on 2014-10-08 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition has been updated and substantially expanded. Starting with the description of our home galaxy, the Milky Way, this cogently written textbook introduces the reader to the astronomy of galaxies, their structure, active galactic nuclei, evolution and large scale distribution in the Universe. After an extensive and thorough introduction to modern observational and theoretical cosmology, the focus turns to the formation of structures and astronomical objects in the early Universe. The basics of classical astronomy and stellar astrophysics needed for extragalactic astronomy are provided in the appendix. While this book has grown out of introductory university courses on astronomy and astrophysics and includes a set of problems and solutions, it will not only benefit undergraduate students and lecturers; thanks to the comprehensive coverage of the field, even graduate students and researchers specializing in related fields will appreciate it as a valuable reference work.
Author : Mark Dijkstra
Publisher : Springer Nature
ISBN 13 : 3662596237
Total Pages : 421 pages
Book Rating : 4.6/5 (625 download)
Download or read book Lyman-alpha as an Astrophysical and Cosmological Tool written by Mark Dijkstra and published by Springer Nature. This book was released on 2019-11-12 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hydrogen Lyman-alpha line is of utmost importance to many fields of astrophysics. This UV line being conveniently redshifted with distance to the visible and even near infrared wavelength ranges, it is observable from the ground, and provides the main observational window on the formation and evolution of high redshift galaxies. Absorbing systems that would otherwise go unnoticed are revealed through the Lyman-alpha forest, Lyman-limit, and damped Lyman-alpha systems, tracing the distribution of baryonic matter on large scales, and its chemical enrichment. We are living an exciting epoch with the advent of new instruments and facilities, on board of satellites and on the ground. Wide field and very sensitive integral field spectrographs are becoming available on the ground, such as MUSE at the ESO VLT. The giant E-ELT and TMT telescopes will foster a quantum leap in sensitivity and both spatial and spectroscopic resolution, to the point of being able, perhaps, to measure directly the acceleration of the Hubble flow. In space, the JWST will open new possibilities to study the Lyman-alpha emission of primordial galaxies in the near infrared. As long as the Hubble Space Telescope will remain available, the UV-restframe properties of nearby galaxies will be accessible to our knowledge. Therefore, this Saas-Fee course appears very timely and should meet the interest of many young researchers.
Author : Elia S Battistelli
Publisher : World Scientific
ISBN 13 : 9811258260
Total Pages : 2281 pages
Book Rating : 4.8/5 (112 download)
Download or read book Fifteenth Marcel Grossmann Meeting, The: On Recent Developments In Theoretical And Experimental General Relativity, Astrophysics, And Relativistic Field Theories - Proceedings Of The Mg15 Meeting On General Relativity (In 3 Volumes) written by Elia S Battistelli and published by World Scientific. This book was released on 2022-05-10 with total page 2281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three volumes of the proceedings of MG15 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 included 40 morning plenary talks over 6 days, 5 evening popular talks and nearly 100 parallel sessions on 71 topics spread over 4 afternoons. These proceedings are a representative sample of the very many oral and poster presentations made at the meeting.Part A contains plenary and review articles and the contributions from some parallel sessions, while Parts B and C consist of those from the remaining parallel sessions. The contents range from the mathematical foundations of classical and quantum gravitational theories including recent developments in string theory, to precision tests of general relativity including progress towards the detection of gravitational waves, and from supernova cosmology to relativistic astrophysics, including topics such as gamma ray bursts, black hole physics both in our galaxy and in active galactic nuclei in other galaxies, and neutron star, pulsar and white dwarf astrophysics. Parallel sessions touch on dark matter, neutrinos, X-ray sources, astrophysical black holes, neutron stars, white dwarfs, binary systems, radiative transfer, accretion disks, quasars, gamma ray bursts, supernovas, alternative gravitational theories, perturbations of collapsed objects, analog models, black hole thermodynamics, numerical relativity, gravitational lensing, large scale structure, observational cosmology, early universe models and cosmic microwave background anisotropies, inhomogeneous cosmology, inflation, global structure, singularities, chaos, Einstein-Maxwell systems, wormholes, exact solutions of Einstein's equations, gravitational waves, gravitational wave detectors and data analysis, precision gravitational measurements, quantum gravity and loop quantum gravity, quantum cosmology, strings and branes, self-gravitating systems, gamma ray astronomy, cosmic rays and the history of general relativity.
![Download Evolution of the Lyman[alpha] [Lymanalpha] Forest from High to Low Redshift PDF Online Free](https://books.google.com/books/content/images/frontcover/ASjQGwAACAAJ?fife=w200-h370)
Author : Rüdiger Riediger
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (245 download)
Download or read book Evolution of the Lyman[alpha] [Lymanalpha] Forest from High to Low Redshift written by Rüdiger Riediger and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andrew Robert Marble
Publisher :
ISBN 13 : 9781109953756
Total Pages : 142 pages
Book Rating : 4.9/5 (537 download)
Download or read book QSO Pairs and the Lyman-alpha Forest: Observations, Simulations, and Cosmological Implications written by Andrew Robert Marble and published by . This book was released on 2007 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a suite of hydrodynamic simulations, anisotropies in the Lyalpha flux correlation function due to redshift-space distortions and spectral smoothing are investigated for 1:8 ≤ z ≤ 3, further enabling future applications of the Alcock-Paczynski test with Lyalpha correlation measurements. Sources of systematic error including limitations in mass-resolution and simulation volume, prescriptions for galactic outflow, and the observationally uncertain mean flux decrement are considered. The latter is found to be dominant. An approximate solution for obtaining the zero-lag cross-correlation for arbitrary spectral resolution is presented, as is a method for implementing the resulting anisotropy corrections while mitigating systematic uncertainty.
Author : Wei-tou Ni
Publisher : World Scientific
ISBN 13 : 9814678511
Total Pages : 636 pages
Book Rating : 4.8/5 (146 download)
Download or read book One Hundred Years Of General Relativity: From Genesis And Empirical Foundations To Gravitational Waves, Cosmology And Quantum Gravity - Volume 2 written by Wei-tou Ni and published by World Scientific. This book was released on 2017-05-26 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this two-volume title is to give a comprehensive review of one hundred years of development of general relativity and its scientific influences. This unique title provides a broad introduction and review to the fascinating and profound subject of general relativity, its historical development, its important theoretical consequences, gravitational wave detection and applications to astrophysics and cosmology. The series focuses on five aspects of the theory: The first three topics are covered in Volume 1 and the remaining two are covered in Volume 2. While this is a two-volume title, it is designed so that each volume can be a standalone reference volume for the related topic.
Author : A.J. Banday
Publisher : Springer Science & Business Media
ISBN 13 : 9783540424680
Total Pages : 732 pages
Book Rating : 4.4/5 (246 download)
Download or read book Mining the Sky written by A.J. Banday and published by Springer Science & Business Media. This book was released on 2001-09-11 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book reviews methods for the analysis of astronomical datasets, particularly emphasizing very large databases arising from both existing and forthcoming projects, as well as current large-scale computer simulation studies. Leading experts give overviews of cutting-edge methods applicable in the area of astronomical data mining.
Author : Nial R. Tanvir
Publisher : World Scientific
ISBN 13 : 9814530409
Total Pages : 496 pages
Book Rating : 4.8/5 (145 download)
Download or read book Hubble Space Telescope And The High Redshift Universe, The - Proceedings Of The 37th Herstmonceux Conference written by Nial R. Tanvir and published by World Scientific. This book was released on 1997 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Since the successful refurbishment mission, the Hubble Space Telescope has made dramatic and exciting progress in unravelling the nature of sources at high redshift. The upcoming installation of the next generation of instruments will give further impetus to the field, particularly in the infrared spectral region. The proceedings of this landmark meeting review the results of the first three years of post-repair data, including the deepest astronomical images ever obtained: the Hubble Deep Field. This was the first presentation of these exciting results at a major international conference. The interface between HST and ground-based facilities and planned programmes with forthcoming HST instruments are also extensively discussed."--Publisher's website.
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309183073
Total Pages : 400 pages
Book Rating : 4.3/5 (91 download)
Download or read book Astronomy and Astrophysics in the New Millennium written by National Research Council and published by National Academies Press. This book was released on 2002-01-07 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: In preparing the report, Astronomy and Astrophysics in the New Millenium , the AASC made use of a series of panel reports that address various aspects of ground- and space-based astronomy and astrophysics. These reports provide in-depth technical detail. Astronomy and Astrophysics in the New Millenium: An Overview summarizes the science goals and recommended initiatives in a short, richly illustrated, non-technical booklet.
