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Author :
Release : 2014
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Kind : eBook
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Book Synopsis Cosmic Reionization On Computers I. Design and Calibration of Simulations by :
Download or read book Cosmic Reionization On Computers I. Design and Calibration of Simulations written by . This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andrei Mesinger
Release : 2015-11-28
Genre : Science
Kind : eBook
Book Rating : 57X/5 ( reviews)
Book Synopsis Understanding the Epoch of Cosmic Reionization by : Andrei Mesinger
Download or read book Understanding the Epoch of Cosmic Reionization written by Andrei Mesinger. This book was released on 2015-11-28. Available in PDF, EPUB and Kindle. Book excerpt: 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?
Author :
Release : 2016
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Book Synopsis Cosmic Reionization On Computers by :
Download or read book Cosmic Reionization On Computers written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: In this paper I show that simulations of reionization performed under the Cosmic Reionization On Computers (CROC) project do converge in space and mass, albeit rather slowly. A fully converged solution (for a given star formation and feedback model) can be determined at a level of precision of about 20%, but such a solution is useless in practice, since achieving it in production-grade simulations would require a large set of runs at various mass and spatial resolutions, and computational resources for such an undertaking are not yet readily available. In order to make progress in the interim, I introduce a weak convergence correction factor in the star formation recipe, which allows one to approximate the fully converged solution with finite resolution simulations. The accuracy of weakly converged simulations approaches a comparable, ~20% level of precision for star formation histories of individual galactic halos and other galactic properties that are directly related to star formation rates, like stellar masses and metallicities. Yet other properties of model galaxies, for example, their HI masses, are recovered in the weakly converged runs only within a factor of two.
Author : Andrei Mesinger
Release : 2019-12-23
Genre : SCIENCE
Kind : eBook
Book Rating : 348/5 ( reviews)
Book Synopsis The Cosmic 21-cm Revolution by : Andrei Mesinger
Download or read book The Cosmic 21-cm Revolution written by Andrei Mesinger. This book was released on 2019-12-23. Available in PDF, EPUB and Kindle. Book excerpt: The redshifted 21-cm signal is set to transform astrophysical cosmology, bringing a historically data-starved field into the era of Big Data. Corresponding to the spin-flip transition of neutral hydrogen, the 21-cm line is sensitive to the temperature and ionization state of the cosmic gas, as well as to cosmological parameters. Crucially, with the development of new interferometers it will allow us to map out the first billion years of our Universe, enabling us to learn about the properties of the unseen first generations of galaxies. Rapid progress is being made on both the observational and theoretical fronts, and important decisions on techniques and future direction are being made. The Cosmic 21-cm Revolution gathers contributions from current leaders in this fast-moving field, providing both an overview for graduate students and a reference point for current researchers.
Author :
Release : 2015
Genre : Astronomy
Kind : eBook
Book Rating : 713/5 ( reviews)
Book Synopsis Advancing astrophysics with the square kilometre array : [proceedings from a meeting held in Giardini Naxos, Sicily, Italy, 9-13 June 2014] by :
Download or read book Advancing astrophysics with the square kilometre array : [proceedings from a meeting held in Giardini Naxos, Sicily, Italy, 9-13 June 2014] written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt:
