Lyman Alpha As An Astrophysical And Cosmological Tool
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Lyman Alpha As An Astrophysical And Cosmological Tool
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Author : Mark Dijkstra
language : en
Publisher: Springer Nature
Release Date : 2019-11-12
Lyman Alpha As An Astrophysical And Cosmological Tool written by Mark Dijkstra and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-11-12 with Science categories.
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.
An Analysis Of Astrophysics And Fundamental Physics From The Lyman Alpha Forest
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Author : Aaron Joseph Day
language : en
Publisher:
Release Date : 2013
An Analysis Of Astrophysics And Fundamental Physics From The Lyman Alpha Forest written by Aaron Joseph Day and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
The Lyman-alpha forest, made up of the cosmologically redshifted hydrogen Lyman-alpha absorption lines in the spectra of distant quasars, is a sensitive probe of cosmology and astrophysics. The shape and distribution of the Lyman-alpha absorption lines is deter- mined by the column densities, peculiar velocities, redshifts, turbulent velocities, temperatures, and the distribution of systems of neutral hydrogen in the space between galaxies known as the intergalactic medium. The Lyman-alpha forest is sensitive to the total cosmological matter power spectrum at the smallest available scales. It provides a long lever arm for constraints on the shape of the matter power spectrum when used in conjunction with measurements at large scales, such as the cosmic microwave background. It also has the potential to be used to detect the small scale matter power suppression caused by the free streaming of fundamental particles including known active light neutrinos or potential warm dark matter candidates. Focusing on the line widths, optical depth, and the power spectrum of the flux of the Lyman-alpha forest, we find that previously published observations do not match the outputs of fully hydrodynamic cosmological computer simulations. We present a new measurement of the power spectrum of the flux of the Lyman-alpha forest, using 91 quasar spectra taken with the Keck HIRES spectrograph. This is the largest high resolution data set to date by a factor of about 3. The high resolution of our data sample gives fully resolved absorption lines. Compared to the low resolution data set from SDSS, the HIRES data allows for more accurate subtraction of metal line contamination, as well as a measurement of the flux power at the smallest scales. Finally, we run a suite of 44 new computer simulations, varying cosmological and astrophysical parameters in an attempt to find a model that matches our observational data. We find that no standard cosmological or astrophysical parameters provide an acceptable match. This calls into question previous constraints on cosmological parameters made from Lyman-alpha forest data sets
Lyman Alpha Radiative Transfer In Cosmological Simulations And Applications To A Z Asymptotically Equal To 8 Ly Alpha Emitter
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Author : Argyro Tasitsiomi
language : en
Publisher:
Release Date : 2005
Lyman Alpha Radiative Transfer In Cosmological Simulations And Applications To A Z Asymptotically Equal To 8 Ly Alpha Emitter written by Argyro Tasitsiomi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Cosmology categories.
Understanding The Epoch Of Cosmic Reionization
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Author : Andrei Mesinger
language : en
Publisher: Springer
Release Date : 2015-11-28
Understanding The Epoch Of Cosmic Reionization written by Andrei Mesinger and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-28 with Science categories.
The dawn of the first stars, galaxies and black holes signaled a fundamental milestone in our Universe’s evolution: the Epoch of Reionization. The light from these galactic ancestors began spreading out, ionizing virtually every atom in existence. Our Universe transitioned from darkness to light, from cold to hot, from simple and boring to the wondrous cosmic zoo we see around us today. Despite its importance, observations of reionization have been few, and their interpretation has been highly controversial. Fortunately, this is rapidly changing. We will soon enter the "Big Data” era of this mysterious epoch, driven by an upcoming wave of observations with state-of-the-art telescopes as well as new sophisticated analysis tools. The aim of this volume is to summarize the current status and future outlook of the reionization field. We bring together leading experts in many sub-disciplines, highlighting the measurements that will illuminate our understanding of reionization and the cosmic dawn: (i) 21cm interferometry; (ii) high-redshift quasar spectra; (iii) high-redshift galaxy surveys; (iv) primary and secondary anisotropies of the Cosmic Microwave Background; (v) high-resolution studies of the metal content of early galaxies. We seek a roadmap to interpreting the wealth of upcoming observations. What is the best use of limited observational resources? How do we develop theoretical tools tailored for each observation? Ultimately, what will we learn about the epoch of reionization and our galactic ancestors?
The Lyman Alpha Forest In Hierarchical Structure Formation Models
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Author : Romeel S Davé
language : en
Publisher:
Release Date : 1998
The Lyman Alpha Forest In Hierarchical Structure Formation Models written by Romeel S Davé and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Astrophysics categories.
Relativistic Astrophysics And Cosmology
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Author : Peter Hoyng
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-01-10
Relativistic Astrophysics And Cosmology written by Peter Hoyng and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-01-10 with Science categories.
Relativistic Astrophysics and Cosmology offers a succinct and self-contained treatment of general relativity and its application to compact objects, gravitational waves and cosmology. The required mathematical concepts are introduced informally, following geometrical intuition as much as possible. The approach is theoretical, but there is ample discussion of observational aspects and of instrumental issues where appropriate. The book includes such topical issues as the Gravity Probe B mission, interferometer detectors of gravitational waves, and the physics behind the angular power spectrum of the cosmic microwave background (CMB). Written for advanced undergraduates and beginning graduate students in (astro)physics, it is ideally suited for a lecture course and contains 140 exercises with extensive hints. The reader is assumed to be familiar with linear algebra and analysis, ordinary differential equations, special relativity, and basic thermal physics.
Relativistic Astrophysics And Cosmology
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Author : Maurice Mandel Shapiro
language : en
Publisher: World Scientific
Release Date : 2004
Relativistic Astrophysics And Cosmology written by Maurice Mandel Shapiro and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Science categories.
This book constitutes the proceedings of the 13th Course of the International School of Cosmic Ray Astrophysics. It focuses on major areas of astrophysics, their relation to cosmic ray physics, and our current understanding of the energetic processes in the Galaxy and the Universe that govern the acceleration and form the features of the cosmic rays that we detect at Earth.The proceedings have been selected for coverage in: ? Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)? CC Proceedings ? Engineering & Physical Sciences
The Ly Alpha Emission Line As A Cosmological Tool
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Author : Kim K. Nilsson
language : en
Publisher:
Release Date : 2007
The Ly Alpha Emission Line As A Cosmological Tool written by Kim K. Nilsson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Emission-line galaxies categories.
Relativistic Astrophysics 2
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Author : I︠A︡kov Borisovich Zelʹdovich
language : en
Publisher: University of Chicago Press
Release Date : 1971
Relativistic Astrophysics 2 written by I︠A︡kov Borisovich Zelʹdovich and has been published by University of Chicago Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Science categories.
Though the kinematics of the evolving universe became known decades ago, research into the physics of processes occurring in the expanding universe received a reliable observational and theoretical basis only in more recent years. These achievements have led in turn to the emergence of new problems, on which an unusually active assault has begun. This second volume of Relativistic Astrophysics provides a remarkably complete picture of the present state of cosmology. It is a synthesis of the theoretical foundations of contemporary cosmology, which are derived from work in relativity, plasma theory, thermodynamics, hydrodynamics, and particle physics. It presents the theoretical work that explains, describes, and predicts the nature of the universe, the physical process that occur in it, the formation of galaxies, the synthesis of the light elements, and the cosmological singularity and the theory of gravitation. This book, long and eagerly awaited, is essential for everyone whose work is related to cosmology and astrophysics.
Constraining Cosmology With Lyman Alpha Emitters
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Author : Ralf Koehler
language : en
Publisher:
Release Date : 2009
Constraining Cosmology With Lyman Alpha Emitters written by Ralf Koehler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.