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Gravitational Microlensing Searches And Results
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Book Synopsis Gravitational Microlensing Searches and Results by :
Download or read book Gravitational Microlensing Searches and Results written by and published by . This book was released on 1997 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Baryonic matter, in the form of Machos (MAssive Compact Halo Objects), might be a significant constituent of the dark matter that dominates the Milky Way. This article describes how surveys for Machos exploit the gravitational microlens magnification of extragalactic stars. The experimental searches for this effect monitor millions of stars, in some cases every night, looking for magnification events. The early results of these surveys indicate that Machos make up a significant fraction of the dark matter in the Milky Way, and that these objects have stellar masses. Truly substellar objects do not contribute much to the total. Additionally, the relatively high event rate towards the Galactic bulge seems to require that the bulge be elongated, and massive.
Book Synopsis Gravitational Microlensing Results from MACHO. by :
Download or read book Gravitational Microlensing Results from MACHO. written by and published by . This book was released on 1996 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MACHO project is searching for dark qter inthe form of massive compact haio objects (Machos), by monitoring the brightness of millions of stars in the Magellanic Clouds to search for gravitational microlensing events. Analysis of our 1st 2.3 years of data for 8.5 million stars in the LMC yields 8 candidate microlensing events, well in excess of the (almost equal to) 1 event expected from lensing by known low-mass stars. The event timescales range from 34 to 145 days, and the estimated optical depth is N 2x10−7, about half of that expected from a 'standard' halo. Likelihood analysis indicates the typical lens mass is 0.5{sup +0.3}{sub -0.2}M{sub {circle_dot}}, suggesting they may be old white dwarfs.
Book Synopsis Gravitational Lensing and Microlensing by : Silvia Mollerach
Download or read book Gravitational Lensing and Microlensing written by Silvia Mollerach and published by World Scientific. This book was released on 2002 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive and self-contained exposition of gravitational lensing phenomena.
Book Synopsis Modern Cosmology by : Scott Dodelson
Download or read book Modern Cosmology written by Scott Dodelson and published by Academic Press. This book was released on 2003-03-13 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced text for senior undergraduates, graduate students and physical scientists in fields outside cosmology. This is a self-contained book focusing on the linear theory of the evolution of density perturbations in the universe, and the anisotropiesin the cosmic microwave background.
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 A Search for Gravitational Microlensing Towards M31 by : Robert Uglesich
Download or read book A Search for Gravitational Microlensing Towards M31 written by Robert Uglesich and published by . This book was released on 2002 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact of Gravitational Lensing on Cosmology (IAU S225) by : International Astronomical Union. Symposium
Download or read book Impact of Gravitational Lensing on Cosmology (IAU S225) written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2005-09-05 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the International Astronomical Union Symposium no. 225, held in July 2004 at the Ecole Polytechnique Federale de Lausanne (EPFL), in Lausanne, Switzerland. The meeting focused on the applications of gravitational lensing to cosmological physics, and this book summarizes the most recent theoretical and observational developments. With chapters written by leading scientists in the field, this is a valuable resource for professional astronomers and graduate students in astronomy, physics and astro-particle physics.
Book Synopsis Gravitational Lensing and Microlensing by : Wallace Larsen
Download or read book Gravitational Lensing and Microlensing written by Wallace Larsen and published by . This book was released on 2017-07-05 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and self-contained exposition of gravitational lensing phenomena. It presents the up-to-date status of gravitational lensing and microlensing, covering the cosmological applications of the observed lensing by galaxies, clusters and the large scale structures, as well as the microlensing searches in the Local Group and its applications to unveil the nature of the galactic dark matter, the search for planetary objects and the distribution of faint stars in our galaxy.Gravitational Lensing and Microlensing is pitched at the level of the graduate student interested in the issues of astrophysics and cosmology, and should be useful for specialist researchers as well.
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 Particles, Strings And Cosmology - Proceedings Of The John Hopkins Workshop On Current Problems In Particle Theory 19 And The Pascos Interdisciplinary Symposium 5 by : Gabor Domokos
Download or read book Particles, Strings And Cosmology - Proceedings Of The John Hopkins Workshop On Current Problems In Particle Theory 19 And The Pascos Interdisciplinary Symposium 5 written by Gabor Domokos and published by World Scientific. This book was released on 1996-07-13 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: This was a joint meeting of the Johns Hopkins Workshop and PASCOS. It was interdisciplinary in its nature. The proceedings gives an overview of the current situation in the interrelated fields of elementary particle physics, astrophysics and cosmology as well as provides a forum for the presentation new results.
Book Synopsis Relativistic Astrophysics And Cosmology: Proceedings Of The Eighteenth Texas Symposium by : Angela V Olinto
Download or read book Relativistic Astrophysics And Cosmology: Proceedings Of The Eighteenth Texas Symposium written by Angela V Olinto and published by World Scientific. This book was released on 1998-06-05 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1963, the Texas Symposia have been a biennial, peripatetic forum for forefront developments on a wide range of topics in relativistic astrophysics, from pulsars to string theory, from the birth of the universe to the death of stars. The 26 plenary lectures, 230 parallel session talks and 265 poster presentations attest to the scientific vitality of this interdisciplinary field.
Book Synopsis Introduction to Gravitational Lensing by : Massimo Meneghetti
Download or read book Introduction to Gravitational Lensing written by Massimo Meneghetti and published by Springer Nature. This book was released on 2021-12-10 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the phenomenology of gravitational lensing in an accessible manner and provides a thorough discussion of the related astrophysical applications. It is intended for advanced undergraduates and graduate students who want to start working in this rapidly evolving field. This includes also senior researchers who are interested in ongoing or future surveys and missions such as DES, Euclid, WFIRST, LSST. The reader is guided through many fascinating topics related to gravitational lensing like the structure of our galaxy, the searching for exoplanets, the investigation of dark matter in galaxies and galaxy clusters, and several aspects of cosmology, including dark energy and the cosmic microwave background. The author, who has gained valuable experience as academic teacher, guides the readers towards the comprehension of the theory of gravitational lensing and related observational techniques by using simple codes written in python. This approach, beyond facilitating the understanding of gravitational lensing, is preparatory for learning the python programming language which is gaining large popularity both in academia and in the private sector.
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 Identification Of Dark Matter, The - Proceedings Of The First International Workshop by : Neil J C Spooner
Download or read book Identification Of Dark Matter, The - Proceedings Of The First International Workshop written by Neil J C Spooner and published by World Scientific. This book was released on 1997-08-02 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: There can be little doubt now that 90-99% of the Universe comprises dark matter. Hence it is of critical importance now not just to pursue further evidence for its existence but rather to identify what the dark matter is. Assessment of progress in this area was the objective of the first International Workshop on the Identification of Dark Matter, in particular to consider what techniques, both observational and experimental, are currently being used, how successful they are now and what new techniques will improve the prospects of identifying the likely candidates. The meeting included reviews on major particle astrophysics topics in dark matter but was largely devoted to short contributed talks on new work in the field. This book is the written proceedings of the meeting.
Book Synopsis Searching for Extrasolar Planets in the Gravitational Microlensing Event MB10311 by : Li-Wei Hung
Download or read book Searching for Extrasolar Planets in the Gravitational Microlensing Event MB10311 written by Li-Wei Hung and published by . This book was released on 2011 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: We analyze the microlensing event MOA-2010-BLG-311 that took place in June 2010. MOA-2010-BLG-311 has a high magnification (Amax ~ 600) with complete data coverage over the peak, making it very sensitive to planetary signals. The lightcurve, composed of observations from twelve observatories, is fitted by a single-lens model with finite-source effect. By looking at the residuals from the fit, we find no obvious planetary signals. The result can be confirmed with additional data that is currently being processed. In general, the probability of detecting a planet strongly depends on the planet mass, the planet separation from its parent star, and the angle of the source trajectory with respect to the binary axis. By simulating lightcurves and fitting them with single lens models, we constrain the range of planets that should be detected, if present, in this event.
Book Synopsis Astrophysical Applications of Gravitational Lensing by : C.S. Kochanek
Download or read book Astrophysical Applications of Gravitational Lensing written by C.S. Kochanek and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: EDWIN TURNER AND RACHEL WEBSTER Co-Chairs, Scientific Organizing Committee lAU Symposium 173, Astrophysical Applications of Gravitational Lenses, was held in Melbourne, Australia from July 9-14, 1995. The Symposium was sponsored by lAU Commissions 47 and 40. With the discovery by Walsh and collaborators of the first instance of a gravitational lens, the multiply imaged quasar 0957+561, the area of grav itational lensing moved from speculative theory to a major astrophysical tool. Since that time, there have been regular, approximately biennial in ternational meetings both in Europe and in North America, which have specifically focussed on gravitational lensing. On this occasion, with the blessing of the lA U, the meeting was held at the University of Melbourne in Australia. It was the first international astronomical meeting to be held at the University of Melbourne, and hope fully has given the astronomical community some enthusiasm for trekking half-way round the globe to Australia to discuss their latest work.
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.
