Download or read book An Infrared Study of Distant Galaxy Clusters written by Adam Virgil Muzzin and published by . This book was released on 2008 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a study of the infrared properties of distant galaxy clusters and their constituent galaxies covering the wavelength range 2.2mum --24mum. In the first part of the thesis we use ground-based K-band (2.2mum) data to study the scaling relations and luminosity functions (LFs) of 15 moderate redshift (0.2 z 0.5), X-ray luminous galaxy clusters. We find that the IR-selected density profiles, IR LFs, and the IR richness/light vs. mass scaling relations for these clusters are nearly identical to their local (z

Download or read book More Things in the Heavens written by Michael Werner and published by Princeton University Press. This book was released on 2019-06-25 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: A sweeping tour of the infrared universe as seen through the eyes of NASA’s Spitzer Space Telescope Astronomers have been studying the heavens for thousands of years, but until recently much of the cosmos has been invisible to the human eye. Launched in 2003, the Spitzer Space Telescope has brought the infrared universe into focus as never before. Michael Werner and Peter Eisenhardt are among the scientists who worked for decades to bring this historic mission to life. Here is their inside story of how Spitzer continues to carry out cutting-edge infrared astronomy to help answer fundamental questions that have intrigued humankind since time immemorial: Where did we come from? How did the universe evolve? Are we alone? In this panoramic book, Werner and Eisenhardt take readers on a breathtaking guided tour of the cosmos in the infrared, beginning in our solar system and venturing ever outward toward the distant origins of the expanding universe. They explain how astronomers use the infrared to observe celestial bodies that are too cold or too far away for their light to be seen by the eye, to conduct deep surveys of galaxies as they appeared at the dawn of time, and to peer through dense cosmic clouds that obscure major events in the life cycles of planets, stars, and galaxies. Featuring many of Spitzer’s spectacular images, More Things in the Heavens provides a thrilling look at how infrared astronomy is aiding the search for exoplanets and extraterrestrial life, and transforming our understanding of the history and evolution of our universe.

Download or read book An Infrared Survey of Galaxy Clusters with the Spitzer Space Telescope written by Daniel V. O'Donnell and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High redshift Universe written by Gregory Zeimann and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the discovery of only the second radio-selected, z ~ 6 quasar. We identified the z=5.95 quasar by matching the optical detections of the deep Sloan Digital Sky Survey (SDSS) Stripe 82 with their radio counterparts in the Stripe82 VLA Survey. The discovered quasar is optically-faint, z = 22.3 and M1450 ~ -24.5, but radio-bright, with a flux density of f[subscript 1.4GHz, peak] = 0.31mJy and a radio-loudness of R ~ 1100 (where R = f[subscript 5GHz]/f2500). The i - z color of the discovered quasar places it outside the color selection criteria for existing optical surveys. We also report the discovery of an IR-selected galaxy cluster in the IRAC Distant Cluster Survey (IDCS). New data from the Hubble Space Telescope spectroscopically confirm the galaxy cluster at z = 1.89 with robust spectroscopic redshifts for seven members. The cluster exhibits a red sequence with a scatter and color indicative of a formation redshift z[subscript f]>~ 3.5. The stellar age of the early-type galaxy population is approximately consistent with those of clusters at lower redshift (1 z 1.5) suggesting that clusters at these redshifts are experiencing ongoing or increasing star formation. Finally, we present near-IR spectroscopy for 18 galaxy clusters at 1.0

Download or read book From Xrays to Far Infrared written by Ricardo Manuel Pérez Martínez and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Clusters of Galaxies are the largest gravitationally bound systems known. Discovered by Charles Messier in the XVIII century, they started to be systematically studied two hundred years later, when Abell and Zwicky undertook a series of surveys to identify concentrations of galaxies in the accessible Universe. These initial studies concluded that clusters of galaxies were formed by objects with the same visual colors and used them to establish memberships. This has been since then one of the biggest issues in this field: the accurate separation of cluster population versus projected foreground or background objects. One other issue is to establish the dynamical status of both the cluster itself and the sources within. From the latter, the former can be inferred, even by crude assumptions on the typical mass of the galaxies, since the velocity dispersion of the members and the cluster radius are linked via the Virial Theorem. However, early observations from spaceborne telescopes discovered significant extended X–ray emission from the cluster cores that was soon identified as Bremsstrahlung radiation in the di use intracluster plasma. The detection of such hot gas led to the calculation of the potential well needed to keep it bound to the system and the amount of gas required. Both estimates, from optical and X–ray data disagreed by up to (and even beyond) 70% in some cases. At the same time, the characteristics of the cluster population were studied and compared to field galaxies. It was found that cluster members favoured elliptical morphologies, larger masses and red colours, versus the dominant fraction of blue mid size spirals in the field. Moreover, the fraction of blue galaxies was found to vary along the clustercentric distance and with redshift, increasing this blue fraction directly with both. It was established that clusters of galaxies harboured much more mass that that directly observable in optical wavelengths and that their members had undergone or were undergoing transformations that made their evolutionary path diverge from their counterparts in the field. To appropriately address those issues a key observable was demanded: accurate redshifts. However, that was found hard to get. On the one hand, photometric redshifts by themselves lack of the precision needed to establish whether a galaxy is within the cluster or not. On the other, spectroscopic redshifts are extremely demanding in terms of observation time and the selection of objects imply some a-priori criteria that may significantly bias the result, focusing in typical cluster members and eventually overlooking objects in the ends of the distribution function of luminosities and colors...

Download or read book Infrared Astronomy Seeing the Heat written by David L. Clements and published by CRC Press. This book was released on 2014-11-21 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uncover the Secrets of the Universe Hidden at Wavelengths beyond Our Optical Gaze William Herschel’s discovery of infrared light in 1800 led to the development of astronomy at wavelengths other than the optical. Infrared Astronomy – Seeing the Heat: from William Herschel to the Herschel Space Observatory explores the work in astronomy that relies on observations in the infrared. Author David L. Clements, a distinguished academic and science fiction writer, delves into how the universe works, from the planets in our own Solar System to the universe as a whole. The book first presents the major telescopes in the world of observational infrared astronomy, explains how infrared light is detected through various kinds of telescopes, and describes practical problems that send infrared astronomers to the tops of mountains and their telescopes into orbit and beyond. Much of the book focuses on what infrared astronomers find in their observations. You’ll discover what infrared astronomy reveals about the planets, moons, and other bodies that constitute our Solar System; star formation and stellar evolution; the processes that shape galaxies; and dark energy and dark matter. Infrared astronomy has revolutionized our understanding of the universe and has become essential in studying cosmology. Accessible to amateur astronomers, this book presents an overview of the science and technology associated with infrared astronomy. With color figures, it shows you how infrared astronomy provides insights into the workings of the universe that are unavailable at other wavelengths.

Download or read book Optical and Infrared Studies of Distant Galaxies written by Alfonso Aragon-Salamanca and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Statistical Methods for Astronomy written by Eric D. Feigelson and published by Cambridge University Press. This book was released on 2012-07-12 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Statistical Methods for Astronomy: With R Applications.

Download or read book NASA Reference Publication written by and published by . This book was released on 1987 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ISO Science Legacy written by Catherine J. Cesarsky and published by Springer Science & Business Media. This book was released on 2006-01-17 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stars are born and die in clouds of gas and dust, opaque to most types of radiation, but transparent in the infrared. Requiring complex detectors, space missions and cooled telescopes, infrared astronomy is the last branch of this discipline to come of age. After a very successful sky survey performed in the eighties by the IRAS satellite, the Infrared Space Observatory, in the nineties, brought spectacular advances in the understanding of the processes giving rise to powerful infrared emission by a great variety of celestial sources. Outstanding results have been obtained on the bright comet Hale-Bopp, and in particular of its water spectrum, as well as on the formation, chemistry and dynamics of planetary objects in the solar system. Ideas on the early stages of stellar formation and on the stellar initial mass function have been clarified. ISO is the first facility in space able to provide a systematic diagnosis of the physical phenomena and the chemistry in the close environment of pre-main sequence stars, in the interstellar medium, and in the final stages of stellar life, using, among other indicators, molecular hydrogen, ubiquitous crystalline silicates, water and ices. ISO has dramatically increased our ability to investigate the power production, excitation and fuelling mechanism of galaxies of every type, and has discovered a new very cold dust component in galaxies. ISO has demonstrated that luminous infrared galaxies were brighter and much more numerous in the past, and that they played a dominant role in shaping present day galaxies and in producing the cosmic infrared background.

Download or read book Far infrared Emission from Rich Clusters of Galaxies written by Caroline Virginia Cox and published by . This book was released on 1995 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Multi wavelength Study of Galaxy Clusters Hosting Radio Sources written by Joshua David Wing and published by . This book was released on 2013 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Galaxy clusters play an important role in understanding the formation of structure in the Universe and can be used to constrain cosmological parameters. Thousands of clusters are known in the nearby Universe, but few are confirmed at large distances. Remote clusters provide a view of the early Universe, and are important for studying galaxy evolution. Here, I describe a technique for finding distant clusters using bent, double-lobed radio galaxies. These radio sources are active galactic nuclei (AGN) that result from outflows of material surrounding supermassive black holes in the centers of massive galaxies. These outflows are typically bent as a result of the relative motion between the host galaxy and the surrounding hot gas that fills clusters. Using the Sloan Digital Sky Survey (SDSS) and the Faint Images of the Radio Sky at Twenty-centimeters ( FIRST ) survey, I determine the frequency with which bent radio sources are associated with rich galaxy clusters in the nearby Universe (z 0.5), as compared to non-bent radio sources. I find that 60% of bent radio sources are located in rich cluster environments, compared to 10 - 20% of non-bent radio sources. Therefore, bent radio sources are efficient tracers for clusters and are useful as beacons of clusters at large distances. Bent radio sources may achieve their morphologies through large-scale cluster mergers that set the intracluster medium (ICM) in motion. Using a suite of substructure tests, I determine the significance of optical substructure in clusters containing radio sources. I find no preference for substructure in clusters with bent double-lobed sources compared to other types of radio sources, indicating that bent sources will not necessarily preferentially select clusters undergoing recent large-scale mergers. Having established that bent radio sources efficiently locate clusters, I have obtained deep, follow-up observations at optical and near-infrared wavelengths to uncover associated distant cluster candidates. In addition, a large Spitzer Space Telescope survey is underway to observe all bent sources not detected in the SDSS. Follow-up observations reveal a large number of high-redshift candidates. Further study of these objects will lend insight into galaxy formation and evolution and feedback between an AGN and its environment at high-redshift for clusters with a range of masses.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalog of Infrared Observations written by Daniel Y. Gezari and published by . This book was released on 1987 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalog of Infrared Observations Appendixes written by Daniel Y. Gezari and published by . This book was released on 1987 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Farthest Things in the Universe written by Jay M. Pasachoff and published by Cambridge University Press. This book was released on 1994-10-13 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, first published in 1994, examines the excitement and challenge of studying the most distant and powerful objects.