The Mass Of Damped Lyman Alpha Systems At High Redshift
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The Mass Of Damped Lyman Alpha Systems At High Redshift
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Author : Jeffrey Donald Cooke
language : en
Publisher:
Release Date : 2005
The Mass Of Damped Lyman Alpha Systems At High Redshift written by Jeffrey Donald Cooke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Damped Lyman Alpha Systems At High Redshift And Models Of Protogalactic Disks
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Author : Karsten Jedamzik
language : en
Publisher:
Release Date : 1998
Damped Lyman Alpha Systems At High Redshift And Models Of Protogalactic Disks written by Karsten Jedamzik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Physical Conditions In Damped Lyman Alpha Systems
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Author : Regina A. Jorgenson
language : en
Publisher:
Release Date : 2008
Physical Conditions In Damped Lyman Alpha Systems written by Regina A. Jorgenson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
The primary goal of this thesis is to determine physical conditions in high redshift galaxies known as Damped Lymna alpha Systems. To this end, we present several key results. First, we discuss a radio-selected quasar survey that demonstrates that dust bias is likely not an issue affecting surveys for DLAs. In other words, we are seeing the true and complete population of DLAs and not missing some very high column density, dusty DLAs . Second, we use neutral carbon (CI) fine structure states to show the presence of gas with densities and pressures 1-2 orders of magnitude larger than those expected in the global DLA, i.e. the presence of knots of dense cold gas existing in the larger diffuse DLA. To solve the imbalance of pressure between these two phases, we speculate that these regions are created by shocks that provide relatively high densities that in turn allow for the existence of CI. Alternatively, these could be photodissociation regions on the edges of even more dense molecular clouds that could even be hosting star formation. This model would explain the presence of a radiation field generally above the background. We also present unambiguous evidence of the presence of cold gas in DLAs -- the discovery of narrow sub-resolution, sub-1 km s−1 CI components with thermal temperatures
The Mass Of Galaxies At Low And High Redshift
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Author : Ralf Bender
language : en
Publisher: Springer Science & Business Media
Release Date : 2003-01-23
The Mass Of Galaxies At Low And High Redshift written by Ralf Bender 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 2003-01-23 with Science categories.
Measuring the masses of galaxies as a function of redshift is perhaps one of the most challenging open issues in current astronomical research. The evolution of the baryonic and dark matter components of galaxies is not only a critical test of the hierarchical formation paradigm, but ultimately also provides new clues on the complex interplay between star formation, the cooling and heating of gas and galaxy merging processes. This book reviews current techniques to measure the baryonic (stellar) and dark masses of nearby galaxies, and focusses on ongoing attempts to measure theses same quantities in galaxies at higher and higher redshifts. It also gives room to future perspectives, with special emphasis on new survey projects and satellite missions.
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.
Cold Gas At High Redshift
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Author : M.N. Bremer
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Cold Gas At High Redshift written by M.N. Bremer 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 2012-12-06 with Science categories.
Recent years have seen increasing evidence that the main epoch of galaxy formation in the universe may be directly accessible to observation. An gular fluctuations in the background relict radiation have been detected by various ground-based instruments as well as by the COBE satellite, and suggest that the epoch of galaxy formation was not so very early. Combined optical and radio studies have found galaxies at redshifts above 2. 0, systems that at least superficially show the characteristics expected of large galaxies seen only shortly after their formation. And absorption lines in the spectra of quasars seem to be telling us that most cold gas at early to intermediate cosmological epochs was in clouds having roughly galaxy sized masses. What kinds of new observations will best help us study this high redshift universe in future? What new instruments will be needed? These are questions that loom large in the minds of the Dutch astronom ical community as we celebrate 25 years of operation of the Westerbork Synthesis Radio Telescope. Celebration of this Silver Jubilee has included a birthday party (on 23 June, 1995), a commemorative volume looking at both the history and the future of the facility ("The Westerbork Observa tory, Continuing Adventure in Radio Astronomy," Kluwer 1996), and an international workshop, held in the village of Hoogeveen on 28-30 August, 1995.
Galaxies At High Redshift
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Author : I. Pérez-Fournon
language : en
Publisher: Cambridge University Press
Release Date : 2003-03-20
Galaxies At High Redshift written by I. Pérez-Fournon and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-03-20 with Science categories.
This volume presents lectures of the XI Canary Islands Winter School of Astrophysics written by experts in the field.
Lyman Alpha Forest And Damped Lyman Alpha Systems
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Author : Varsha Purushottam Kulkarni
language : en
Publisher:
Release Date : 1996
Lyman Alpha Forest And Damped Lyman Alpha Systems written by Varsha Purushottam Kulkarni and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Quasars categories.
Qso Absorption Lines
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Author : Georges Meylan
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Qso Absorption Lines written by Georges Meylan 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 2013-11-11 with Science categories.
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.
International Workshop On Large Scale Structure In The Universe Potsdam 18 24 September 1994
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Author : Jan P. Mucket
language : en
Publisher: World Scientific
Release Date : 1995
International Workshop On Large Scale Structure In The Universe Potsdam 18 24 September 1994 written by Jan P. Mucket and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Galaxies categories.