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Quasers And Gravitational Lenses
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Book Synopsis GravItational Lensing of Quasars by : Alexander Eigenbrod
Download or read book GravItational Lensing of Quasars written by Alexander Eigenbrod and published by CRC Press. This book was released on 2011-12-14 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The universe, in all its richness, diversity and complexity, is populated by a myriad of intriguing celestial objects. Among the most exotic of them are gravitationally lensed quasars. A quasar is an extremely bright nucleus of a galaxy, and when such an object is gravitationally lensed, multiple images of the quasar are produced – this phenomenon of cosmic mirage can provide invaluable insights on burning questions, such as the nature of dark matter and dark energy. After presenting the basics of modern cosmology, GravItational Lensing of Quasars describes active galactic nuclei, the theory of gravitational lensing, and presents a particular numerical technique to improve the resolution of astronomical data. The book then enters the heart of the subject with the description of important applica- tions of gravitational lensing of quasars, such as the measurement of the famous Hubble constant, the determination of the dark matter distribution in galaxies, and the observation of the mysterious inner parts of quasars with much higher resolutions than those accessible with the largest telescopes. This book gives an overview of the current status of research in the field of gravitationally lensed quasars. It also gives some insights about the way this research is conducted in practice, and presents real data and results obtained with several high-technology instruments of the Very Large Telescope of the European Southern Observatory.
Book Synopsis Gravitational Lenses by : P. Schneider
Download or read book Gravitational Lenses written by P. Schneider and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Light observed from distant objects is found to be deflected by the gravitational field of massive objects near the line of sight - an effect predicted by Einstein in his first paper setting forth the general theory of relativity, and confirmed by Eddington soon afterwards. If the source of the light is sufficiently distant and bright, and if the intervening object is massive enough and near enough to the line of sight, the gravitational field acts like a lens, focusing the light and producing one or more bright images of the source. This book, by renowned researchers in the field, begins by discussing the basic physics behind gravitational lenses: the optics of curved space-time. It then derives the appropriate equations for predicting the properties of these lenses. In addition, it presents up-to-date observational evidence for gravitational lenses and describes the particular properties of the observed cases. The authors also discuss applications of the results to problems in cosmology.
Book Synopsis Gravitational Lensing by : Yannick Mellier
Download or read book Gravitational Lensing written by Yannick Mellier and published by Springer. This book was released on 1990 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an exhaustive review of our theoretical and observational knowledge of gravitational lensing 10 years after the discovery of the first lensed quasar, Q0957+561. Gravitational optics, optical, infrared, and radio observations of quasar-lens candidates, microlensing, arcs in clusters of galaxies, and radio rings are presented. In particular, the continuing survey of quasar-lens candidates, the new measurement of the time delay in 0957+561, the suspended microlensing effect through the galaxy 2237+030, as well as the discovery of new arcs and the measurement of new redshifts for two of them are presented. Numerous papers on the modelling of arcs and rings show how it should be possible to probe dark matter with these unexpected gravitational telescopes. Finally, tables summarize all the lens candidates we know today.
Book Synopsis Quasars and Gravitational Lenses by : Université de Liège. Institut d'astrophysique
Download or read book Quasars and Gravitational Lenses written by Université de Liège. Institut d'astrophysique and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gravitational Lensing by : Héctor Vives Arias
Download or read book Gravitational Lensing written by Héctor Vives Arias and published by . This book was released on 2016 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gravitational Lensing: An Astrophysical Tool by : Frederic Courbin
Download or read book Gravitational Lensing: An Astrophysical Tool written by Frederic Courbin and published by Springer. This book was released on 2008-01-11 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gravitational lensing is by now sufficiently well understood that it can be used as a tool of investigation in other astrophysical areas. Applications include the determination of the Hubble constant, probing the dark matter context of galaxies and the mapping of the universe to the identification of otherwise invisible large-scale structures. Each chapter of the book covers in a self-contained manner a subfield of gravitational lensing, with the double aim of describing in a simple way the basics of the theory and of reviewing the most recent developments as well as applications foreseen in the near future. The book will thus be particularly useful as a high-level textbook for nonspecialist researchers and advanced students wishing to become familiar with the field all the way up to the forefront of research.
Book Synopsis Gravitational Lensing: Strong, Weak and Micro by : Peter Schneider
Download or read book Gravitational Lensing: Strong, Weak and Micro written by Peter Schneider and published by Springer Science & Business Media. This book was released on 2006-12-30 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: The observation, in 1919 by A.S. Eddington and collaborators, of the gra- tational de?ection of light by the Sun proved one of the many predictions of Einstein’s Theory of General Relativity: The Sun was the ?rst example of a gravitational lens. In 1936, Albert Einstein published an article in which he suggested - ing stars as gravitational lenses. A year later, Fritz Zwicky pointed out that galaxies would act as lenses much more likely than stars, and also gave a list of possible applications, as a means to determine the dark matter content of galaxies and clusters of galaxies. It was only in 1979 that the ?rst example of an extragalactic gravitational lens was provided by the observation of the distant quasar QSO 0957+0561, by D. Walsh, R.F. Carswell, and R.J. Weymann. A few years later, the ?rst lens showing images in the form of arcs was detected. The theory, observations, and applications of gravitational lensing cons- tute one of the most rapidly growing branches of astrophysics. The gravi- tional de?ection of light generated by mass concentrations along a light path producesmagni?cation,multiplicity,anddistortionofimages,anddelaysp- ton propagation from one line of sight relative to another. The huge amount of scienti?c work produced over the last decade on gravitational lensing has clearly revealed its already substantial and wide impact, and its potential for future astrophysical applications.
Book Synopsis Gravitational Lensing by : Yannick Mellier
Download or read book Gravitational Lensing written by Yannick Mellier and published by Springer. This book was released on 2014-03-12 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an exhaustive review of our theoretical and observational knowledge of gravitational lensing 10 years after the discovery of the first lensed quasar, Q0957+561. Gravitational optics, optical, infrared, and radio observations of quasar-lens candidates, microlensing, arcs in clusters of galaxies, and radio rings are presented. In particular, the continuing survey of quasar-lens candidates, the new measurement of the time delay in 0957+561, the suspended microlensing effect through the galaxy 2237+030, as well as the discovery of new arcs and the measurement of new redshifts for two of them are presented. Numerous papers on the modelling of arcs and rings show how it should be possible to probe dark matter with these unexpected gravitational telescopes. Finally, tables summarize all the lens candidates we know today.
Author :Space Telescope Science Institute (U.S.). Symposium Publisher :Cambridge University Press ISBN 13 :9780521591645 Total Pages :354 pages Book Rating :4.5/5 (916 download)
Book Synopsis The Extragalactic Distance Scale by : Space Telescope Science Institute (U.S.). Symposium
Download or read book The Extragalactic Distance Scale written by Space Telescope Science Institute (U.S.). Symposium and published by Cambridge University Press. This book was released on 1997-06-28 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the hottest debates in astronomy and cosmology today concerns the value of the Hubble constant. This constant is of paramount importance since it fixes the size and age of the Universe. At a symposium at the Space Telescope Science Institute, experts from around the world presented the latest results from a plethora of techniques for determining the Hubble constant. The value has always been controversial, but at this meeting experts' results agreed for the first time to within about 20%. Based on the meeting, this book presents twenty-three specially written review articles. They provide a comprehensive account of the Hubble-constant debate with the latest results from gravitational lensing, supernovae and novae, the Tully-Fisher relation, the Sunyaev-Zeldovich effect, globular clusters, planetary nebulae, light echoes, and the Hubble Space Telescope Key Project. This timely volume provides a standard reference for graduate students and researchers in astronomy and cosmology.
Book Synopsis Quasars and Gravitational Lenses by :
Download or read book Quasars and Gravitational Lenses written by and published by Universite de Liege Institut D'Astrophysique. This book was released on 1983 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quasars and Black Holes written by and published by . This book was released on 2013 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: "An introduction to quasars and black holes with information about their formation and characteristics. Includes diagrams, fun facts, a glossary, a resource list, and an index"--Provided by publisher.
Book Synopsis Gravitational Lenses by : Rainer Kayser
Download or read book Gravitational Lenses written by Rainer Kayser and published by Springer. This book was released on 1992 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most spectacular predictions of Einstein's theory of general relativity is the occurrence of gravitational lenses in our galactic system. Nowadays the mastering of the mathematics together with the technology available to astronomers allow Einstein's prediction to be confirmed. Several reviews here give the reader the chance to under- stand the basic theoretical concept of gravitational lensing and to obtain an overview of observational work. The present state of the field and latest results are given in a large number of specialized papers. Anextensive source and subject index make these proceedings valuable also as areference book for all researchers active in the field.
Book Synopsis Gravitational Lensing of Quasars by Edge-on Spiral Galaxies by : Emily P. Wang
Download or read book Gravitational Lensing of Quasars by Edge-on Spiral Galaxies written by Emily P. Wang and published by . This book was released on 2007 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, I studied the lensed quasar CX2201-3201, which is lensed by an edge-on spiral galaxy. The unusually high tilt of the spiral galaxy provides us with a rare opportunity for mass modeling. In addition, the unusual placement of the two visible images of the system offers an intriguing lensing system for study-the two images straddle the lensing galaxy's visible disk, but are off to one side of the light centroid. Based on mass models for the lens that are constrained by the visible disk of the galaxy, the quadrupole of the disk is strong enough to make CX2201 a "naked cusp" system, which should have three images-the two images we see, plus another located in the disk of the galaxy. We attempt to explain the absence of the third "naked cusp" image by using a series of increasingly exotic mass models. Unfortunately, none of these models turn out to be both satisfactory and a feasible solution. Although we are unable to answer the question of why the two images of CX2201 are located off to the side of the lensing galaxy's center, we gain a better understanding of the challenges this system poses for those attempting to model the lensing galaxy's mass. HST data has been obtained for the system, and although this data were obtained too late for proper inclusion in this thesis, they may aid future investigators in analyzing CX2201. Plans to obtain detailed rotation curves for the lensing galaxy are also underway, and it is the hope that future investigators will come to a better understanding of CX2201's unique features.
Book Synopsis Formation of Structure in the Universe by : Avishai Dekel
Download or read book Formation of Structure in the Universe written by Avishai Dekel and published by Cambridge University Press. This book was released on 1999-04-15 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: This advanced textbook provides an up-to-date and comprehensive introduction to the very active field of structure formation in cosmology. It is written by eleven world-leading authorities. Written in a clear and pedagogical style appropriate for graduate students in astronomy and physics, this textbook introduces the reader to a wide range of exciting topics in contemporary cosmology: from recent advances in redshift surveys, to the latest models in gravitational lensing and cosmological simulations. The authors are all world-renowned experts both for their research and teaching skills. In the fast-moving field of structure formation, this book provides advanced undergraduate and graduate students with a welcome textbook which unites the latest theory and observations.
Book Synopsis Singularity Theory and Gravitational Lensing by : Arlie O. Petters
Download or read book Singularity Theory and Gravitational Lensing written by Arlie O. Petters and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph is the first to develop a mathematical theory of gravitational lensing. The theory applies to any finite number of deflector planes and highlights the distinctions between single and multiple plane lensing. Introductory material in Parts I and II present historical highlights and the astrophysical aspects of the subject. Part III employs the ideas and results of singularity theory to put gravitational lensing on a rigorous mathematical foundation.
Book Synopsis New Optical Surveys for Gravitationally Lensed Quasars by : Nicholas D. Morgan
Download or read book New Optical Surveys for Gravitationally Lensed Quasars written by Nicholas D. Morgan and published by . This book was released on 2002 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The HST snapshot survey has searched for close separation lenses - spirals in particular - that are difficult to resolve from ground-based surveys. Of the eight systems discovered form these surveys, five are described in detail in this thesis. The first object, FBQ 1633+3134, is a 0"f7 double discovered from the MDM survey. Discrepant optical and radio flux ratios for this system means that it is most likely a physical binary quasar. The second, third and fourth objects -CTQ 414, HE 0230-2130, and CTQ 839 - were all discovered from the CTIO survey. The former two systems are confirmed gravitational lenses, while the latter is a binary quasar. CTQ 414 is a 12 double quasar that is well suited for future optical monitoring and a possible time-delay measurement, HE 0230-2130 is a complex four-image gravitational lens formed by two lensing galaxies, and CTQ 839 is almost certainly a binary quasar after repeated attempts to detect the hypothesized lensing galaxy have failed. The fifth system, the lensed quasar CTQ 327, is a 1"/2 double discovered from the HST survey which is also well suited for optical monitoring and a possible time-delay measurement. The superior angular resolution afforded by the HST snapshot survey is also used to constrain the matter density of any hypothetical population of dark, compact objects at high redshift to be less than 2.2% of the closure density for objects of mass 109 6M0, and rules out a closure density of any compact object in the mass range 1075
Download or read book SDSSJ102111.02+491330.4 written by and published by . This book was released on 2005 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report follow-up observations of two gravitational lens candidates identified in the Sloan Digital Sky Survey (SDSS) dataset. We have confirmed that SDSS J102111.02+491330.4 is a previously unknown gravitationally lensed quasar. This lens system exhibits two images of a z = 1.72 quasar, with an image separation of 1''.14 ± 0.04. Optical and near-IR imaging of the system reveals the presence of the lensing galaxy between the two quasar images. Observations of SDSS J112012.12+671116.0 indicate that it is more likely a binary quasar than a gravitational lens. This system has two quasars at a redshift of z = 1.49, with an angular separation of 1''.49 ± 0.02. However, the two quasars have markedly different SEDs and no lens galaxy is apparent in optical and near-IR images of this system. We also present a list of 31 SDSS lens candidates which follow-up observations have confirmed are not gravitational lenses.
