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Author :
Release : 2022
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Kind : eBook
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Book Synopsis High-redshift Lyman-alpha Emitters in Blank and Lensing Fields by :
Download or read book High-redshift Lyman-alpha Emitters in Blank and Lensing Fields written by . This book was released on 2022. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark Dijkstra
Release : 2019-11-12
Genre : Science
Kind : eBook
Book Rating : 237/5 ( reviews)
Book Synopsis Lyman-alpha as an Astrophysical and Cosmological Tool by : Mark Dijkstra
Download or read book Lyman-alpha as an Astrophysical and Cosmological Tool written by Mark Dijkstra. This book was released on 2019-11-12. 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 : Josephine Victoria Kerutt
Release : 2019
Genre :
Kind : eBook
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Book Synopsis The High-redshift Voyage of Lyman [alpha] and Lyman Continuum Emission as Told by MUSE by : Josephine Victoria Kerutt
Download or read book The High-redshift Voyage of Lyman [alpha] and Lyman Continuum Emission as Told by MUSE written by Josephine Victoria Kerutt. This book was released on 2019. Available in PDF, EPUB and Kindle. Book excerpt: Most of the matter in the universe consists of hydrogen. The hydrogen in the intergalactic medium (IGM), the matter between the galaxies, underwent a change of its ionisation state at the epoch of reionisation, at a redshift roughly between 6>z>10, or ~10^8 years after the Big Bang. At this time, the mostly neutral hydrogen in the IGM was ionised but the source of the responsible hydrogen ionising emission remains unclear. In this thesis I discuss the most likely candidates for the emission of this ionising radiation, which are a type of galaxy called Lyman alpha emitters (LAEs). As implied by their name, they emit Lyman alpha radiation, produced after a hydrogen atom has been ionised and recombines with a free electron. The ionising radiation itself (also called Lyman continuum emission) which is needed for this process inside the LAEs could also be responsible for ionising the IGM around those galaxies at the epoch of reionisation, given that enough Lyman continuum escapes. Through this mechanism, Lyman alpha and Lyman continuum ...
Author : Vladivoj Valkovic
Release : 2024-09-27
Genre : Science
Kind : eBook
Book Rating : 070/5 ( reviews)
Book Synopsis Origins of Life Volume II by : Vladivoj Valkovic
Download or read book Origins of Life Volume II written by Vladivoj Valkovic. This book was released on 2024-09-27. Available in PDF, EPUB and Kindle. Book excerpt: In Origins of Life Volume II, life and its origin are inspected from traditional and unexpected points of view. The book takes an interdisciplinary approach, discussing astrobiology; chemical evolution; and how the Universe accommodates life, molecular biology, and philosophy. It is an open-minded approach, fully referenced throughout, and each chapter includes a further reading section for anyone wishing to learn more about that perspective on the origins of life. First, everything started, with the Big Bang, from nothing. It appears now that everything was aiming toward our existence, some 13.75 × 109 years later, being capable of understanding it all. We did it using powerful tools: science, philosophy, and religion. Although we appreciate the contributions made by philosophy and religion, our contemplations and doubts are based on the plentiful scientific evidence provided. The reader will be guided from make-up of the "life stage" (Universe), tools and materials needed for the living matter to be formed in the small part of the Universe, which one could call Human Neighborhood, or the Local Universe. It contains galaxies, galaxy clusters, and voids, and the Milky Way and its satellites influencing each other during this time span. The book is easy to read, accompanied by numerous references; it could be of use to the expert in the field as well as for curious minds with a scientific, philosophical, or religious background.
Author : Spencer Fuller
Release : 2020
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Book Synopsis Spectroscopically Confirmed Lyman Alpha Emitters from Redshift 5 to 7 Behind Ten Galaxy Cluster Lenses by : Spencer Fuller
Download or read book Spectroscopically Confirmed Lyman Alpha Emitters from Redshift 5 to 7 Behind Ten Galaxy Cluster Lenses written by Spencer Fuller. This book was released on 2020. Available in PDF, EPUB and Kindle. Book excerpt:
