Download or read book Towards Next Generation Millimeter Wave Cosmology from the Atacama written by Zequn Li and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We expect both exciting new insights and analysis challenges from ground-based CMB surveys in the next decade, such as from the existing Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT), as well as from the upcoming Simons Observatory and CMB-S4.In this thesis, we demonstrate the utility of cross-correlating data from a large aperture instrument (ACT) with data from the Atacama B-mode Search (ABS), a small aperture instrument equipped with a half-wave plate, to target the polarization at large scales from the ground. This strategy is able to significantly suppress atmospheric contamination of the resulting power spectrum, and we expect to employ it in upcoming surveys. We then implement a complete Planck satellite analysis pipeline that reproduces both the intermediary and cosmological results of the PR3 data release. This effort is required for current and future joint analysis efforts of the Planck data with new, large-sky-fraction observations such as from ACT and Simons Observatory.We also present new simulated catalogs and maps of radio galaxies, which are consistent with the latest radio data (unlike pre-existing works). These radio sources present a challenge for a variety of cosmological analyses in the millimeter. These maps are also correlated with the large-scale structure through the Websky simulations. Finally, we provide new constraints on the interaction cross section between dark matter and baryons in the early Universe, by combining ACT DR4 data with Planck PR3. We show that the addition of small-scale data from ACT nearly halves the allowed parameter space of dark matter-baryon interaction models, compared to previous work using Planck alone.
Download or read book Astronomy and Astrophysics in the New Millennium written by National Research Council and published by National Academies Press. This book was released on 2002-01-07 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: In preparing the report, Astronomy and Astrophysics in the New Millenium , the AASC made use of a series of panel reports that address various aspects of ground- and space-based astronomy and astrophysics. These reports provide in-depth technical detail. Astronomy and Astrophysics in the New Millenium: An Overview summarizes the science goals and recommended initiatives in a short, richly illustrated, non-technical booklet.
Download or read book Next Generation Wireless Communications Using Radio over Fiber written by Nathan J. Gomes and published by John Wiley & Sons. This book was released on 2012-08-15 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taking a coherent and logical approach, this book describes the potential use of co-ordinated multipoint systems supported by radio over fiber. It covers an impressive breadth of topics, ranging from components, subsystem and system architecture, to network management and business perspectives. The authors show the importance of radio over fiber in eliminating or mitigating against the current, perceived barriers to the use of co-ordinated multipoint, and the drivers for standardisation activities in future mobile/wireless systems over the next few years. The book brings together the system concept for centralized processing, including what is required for co-existence with legacy wireless systems, the algorithms that can be used for improving wireless bandwidth utilization at physical and MAC layers and the radio over fiber network and link design necessary to support the wireless system. Other important research is also covered as the authors look at compensating for radio over fiber impairments and providing simple network management functions. A study of service provision and the business case for such a future wireless system is also fully considered. This book comes at an important time for future wireless systems with standardization of fourth generation wireless systems still ongoing. The content enables readers to make key decisions about future standardisation and their own research work. The business analysis also makes the book useful to those involved in deciding the future directions of telecoms organisations. This information will be core to their decision-making as it provides technical knowledge of the state-of-the-art but also system level assessments of what is possible in a business environment.
Download or read book The Spatialities of Radio Astronomy written by Guy Trangoš and published by Taylor & Francis. This book was released on 2023-04-28 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Spatialities of Radio Astronomy examines the multidisciplinary overlap between the spatial disciplines and the studies of science and technology through a comparative study of four of the world’s most important radio telescopes. Employing detailed analysis, historical research, interviews, personal observations, and various conceptual manoeuvres, Guy Trangoš reveals the depth of spatial process active at these scientific sites and the territories they traverse. Through the conceptual frameworks of territory, hyper-concentration, and contingency, Trangoš interprets the telescope as exploded across space and time, present in multiple connected sites simultaneously, and active in the production of space. He develops a historiographic and contemporary analysis of the Atacama Large Millimeter/submillimeter Array (ALMA, Chile); the Five-hundred-meter Aperture Spherical radio Telescope (FAST, China); the Arecibo Observatory (Puerto Rico); and the MeerKAT/SKA (South Africa). These case studies are global exemplars of the different spatial transformations that occur through science. Their relationships to surrounding communities and landscapes reveal deeper constitutional processes embodied in each institutional and spatial form. This book spans the modern history of architecture and science, the studies of science, technology and society, and urban theory. It is of specific interest to architects and designers expanding their analysis of spatial production, scholars in the study of geography, landscape, science, technology, and astronomy, and people fascinated with how these radio telescopes were conceptualised, built, and operate today.
Download or read book Open Skies written by Kenneth I. Kellermann and published by Springer Nature. This book was released on 2020-01-01 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book on the history of the National Radio Astronomy Observatory covers the scientific discoveries and technical innovations of late 20th century radio astronomy with particular attention to the people and institutions involved. The authors have made extensive use of the NRAO Archives, which contain an unparalleled collection of documents pertaining to the history of radio astronomy, including the institutional records of NRAO as well as the personal papers of many of the pioneers of U.S. radio astronomy. Technical details and extensive citations to original sources are given in notes for the more technical readers, but are not required for an understanding of the body of the book. This book is intended for an audience ranging from interested lay readers to professional researchers studying the scientific, technical, political, and cultural development of a new science, and how it changed the course of 20th century astronomy.
Download or read book Development of Coherent Detector Technologies for Sub Millimetre Wave Astronomy Observations written by Boon Kok Tan and published by Springer. This book was released on 2015-09-15 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis describes the development of receiver technologies for sub-millimetre astronomy instruments, focusing on high performance coherent cryogenic detectors operating close to the superconductor gap frequency. The mixer chip which comprises the SIS devices, fed by a unilateral finline and matching planar circuits was fabricated on 15 micron silicon substrate using the recently developed Silicon-On-Insulator (SOI) technology. This offered broadband IF and RF performance, with fully integrated on-chip planar circuits resulting in an easily reproducible mixer chip and a simple mixer block. An important consequence of this design is that it can be extended to the supra-THz region and making the fabrication of multi-pixel heterodyne arrays feasible. The extension of the operation of major telescopes such as ALMA, APEX and the GLT from single pixel to large format arrays is the subject of extensive research at present time since it will allow fast mapping combined with high resolution of the submillimetre sky. The technology described in this thesis makes a major contribution to this effort.
Download or read book Astronomy written by Liz Kruesi and published by ABDO. This book was released on 2015-12-15 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thrilling new discoveries in science and technology are announced almost daily. Cutting-Edge Science and Technology keeps readers at the forefront of new research. Astronomycovers the hottest topics in deep space, including exoplanets, black holes, and dark matter, as well as the amazing telescope technology that makes this work possible. High-impact photos and explanatory graphics and charts bring scientific concepts to life. Features include essential facts, a glossary, selected bibliography, websites, source notes, and an index. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.
Download or read book 100 Years of Superconductivity written by Horst Rogalla and published by Taylor & Francis. This book was released on 2011-11-11 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt: Even a hundred years after its discovery, superconductivity continues to bring us new surprises, from superconducting magnets used in MRI to quantum detectors in electronics. 100 Years of Superconductivity presents a comprehensive collection of topics on nearly all the subdisciplines of superconductivity. Tracing the historical developments in supe
Download or read book Next Generation Wireless Terahertz Communication Networks written by Saim Ghafoor and published by CRC Press. This book was released on 2021-08-10 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid growth of the data traffic demands new ways to achieve high-speed wireless links. The backbone networks, data centers, mission-critical applications, as well as end-users sitting in office or home, all require ultra-high throughput and ultra-low latency wireless links. Sophisticated technological advancement and huge bandwidth are required to reduce the latency. Terahertz band, in this regard, has a huge potential to provide these high-capacity links where a user can download the file in a few seconds. To realize the high-capacity wireless links for future applications, in this book, different aspects of the Terahertz band wireless communication network are presented. This book highlights the Terahertz channel characteristics and modeling, antenna design and beamforming, device characterization, applications, and protocols. It also provides state-of-the-art knowledge on different communication aspects of Terahertz communication and techniques to realize the true potential of the Terahertz band for wireless communication.
Download or read book Encyclopedia of Astronomy Astrophysics written by P Murdin and published by CRC Press. This book was released on 2001-01-01 with total page 5610 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a unique collaboration, Nature Publishing Group and Institute of Physics Publishing have published the most extensive and comprehensive reference work in astronomy and astrophysics. This unique resource covers the entire field of astronomy and astrophysics and this online version includes the full text of over 2,750 articles, plus sophisticated search and retrieval functionality and links to the primary literature. The Encyclopaedia's authority is assured by editorial and advisory boards drawn from the world's foremost astronomers and astrophysicists. This first class resource is an essential source of information for undergraduates, graduate students, researchers and seasoned professionals, as well as for committed amateurs, librarians and lay people wishing to consult the definitive astronomy and astrophysics reference work.
Download or read book The Square Kilometre Array written by Richard T. Schilizzi and published by Springer Nature. This book was released on with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Atacama Cosmology Telescope written by and published by . This book was released on 2011 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present constraints on cosmological parameters based on a sample of Sunyaev-Zeldovich-selected galaxy clusters detected in a millimeter-wave survey by the Atacama Cosmology Telescope. The cluster sample used in this analysis consists of 9 optically-confirmed high-mass clusters comprising the high-significance end of the total cluster sample identified in 455 square degrees of sky surveyed during 2008 at 148GHz. We focus on the most massive systems to reduce the degeneracy between unknown cluster astrophysics and cosmology derived from SZ surveys. We describe the scaling relation between cluster mass and SZ signal with a 4-parameter fit. Marginalizing over the values of the parameters in this fit with conservative priors gives? = 0.851 ± 0.115 and w = -1.14 ± 0.35 for a spatially-flat wCDM cosmological model with WMAP 7-year priors on cosmological parameters. This gives a modest improvement in statistical uncertainty over WMAP 7-year constraints alone. Fixing the scaling relation between cluster mass and SZ signal to a fiducial relation obtained from numerical simulations and calibrated by X-ray observations, we find?8 = 0.821 ± 0.044 and w = -1.05 ± 0.20. These results are consistent with constraints from WMAP 7 plus baryon acoustic oscillations plus type Ia supernoava which give?8 = 0.802 ± 0.038 and w = -0.98 ± 0.053. A stacking analysis of the clusters in this sample compared to clusters simulated assuming the fiducial model also shows good agreement. These results suggest that, given the sample of clusters used here, both the astrophysics of massive clusters and the cosmological parameters derived from them are broadly consistent with current models.
Download or read book Proceedings of the 2002 International Symposium on Cosmology and Particle Astrophysics written by Xiao-Gang He and published by World Scientific. This book was released on 2003 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2002 International Symposium on Cosmology and Particle Astrophysics (CosPA2002) was held from May 31 to June 2, 2002, in Taipei, Taiwan. The topics covered during the symposium included: (1) CMB Physics: SZ Surveys, Polarizations, Large-Scale Structures, Gravitational Lensing, and Data Analysis; (2) Dark Energy and Dark Matter: Dark Matter Physics, Quintessence and the Cosmological Constant; (3) Cosmology of Ultra High Energy Cosmic Rays; (4) Inflation and New Physics: Inflation, Noncommutative Geometry, Branes and Extra Dimensions. The proceedings have been selected for coverage in: . OCo Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)."
Download or read book Toward a New Millennium in Galaxy Morphology written by David L. Block and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: South Africa - a land of paradigm shifts. A land where we are willing to leave behind the old, to bravely accept the new. What do we need to exit the dark ages in the morphology of galaxies? How prevalent is the cherishing of old concepts? Traditional morphology has been `mask-oriented', focusing on masks of dust and gas which may constitute only 5 percent of the dynamical mass of a galaxy. Some of the world's foremost astronomers flew to South Africa to address morphologically related issues at an International Conference, the proceedings of which are contained in this volume. Examine predicted extinction curves for primordial dust at high redshift. Stars evolve; why not dust? Read about the breakdown of the Hubble sequence at a redshift of one. Explore the morphology of rings; the mysteries of metal-rich globular clusters; vigorous star-formation in the Large Magellanic Cloud; the world of secular evolution, where galaxies change their shapes within one Hubble time. And much more. Examine a new kinematical classification scheme of the unmasked, dust-penetrated near-infrared images of spiral galaxies. This volume contains over 80 refereed contributions (including 18 in-depth keynote review articles), 40 pages of questions and answers, a panel discussion transcribed from tape and 24 colour plates. The volume is unique in that contributions from both high and low redshift experts are represented at a level readily accessible to postdoctoral students entering the exciting world of morphology - whether it be of the local, or more distant, Universe.
Download or read book Cosmology And Particle Astrophysics Proceedings Of The 2002 International Symposium On Cospa 2002 written by Kin-wang Ng and published by World Scientific. This book was released on 2003-03-12 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2002 International Symposium on Cosmology and Particle Astrophysics (CosPA2002) was held from May 31 to June 2, 2002, in Taipei, Taiwan. The topics covered during the symposium included: (1) CMB Physics: SZ Surveys, Polarizations, Large-Scale Structures, Gravitational Lensing, and Data Analysis; (2) Dark Energy and Dark Matter: Dark Matter Physics, Quintessence and the Cosmological Constant; (3) Cosmology of Ultra High Energy Cosmic Rays; (4) Inflation and New Physics: Inflation, Noncommutative Geometry, Branes and Extra Dimensions.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)
Download or read book Cryogenic Optics and Detectors for Next generation Microwave Cosmology and Astrophysics Observatories written by Nicholas Flood Cothard and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Millimeter and sub-millimeter observatories provide a unique and powerful window into the origins, content, and evolution of the universe. In our current era of precision cosmology, measurements of the cosmic microwave background (CMB) yield constraints on frontier physics such as dark energy, the sum of the neutrino masses, and models of inflation. Measurements of the CMB also reveal the astrophysics of galaxy clusters and can then be used to glean information about the early universe. The early universe can also be studied with millimeter-wave observations of redshifted spectral line emissions from early star-forming galaxies during the Epoch of Reionization (EoR). A relatively new method, called spectral line intensity mapping (LIM), can be used to tomographically map the EoR. LIM observations of the EoR will reveal properties of the reionization sources and how reionization impacted the evolution of the intergalactic medium (IGM) into the large-scale structure we see today. In order to improve CMB observations and enable new LIM measurements, microwave observatories require high-throughput cryogenic optics and interferometry, and ultra-sensitive superconducting detectors. This dissertation presents developments of these technologies for three projects : the Atacama Cosmology Telescope (ACT), the CCAT-prime Observatory, and the Simons Observatory (SO). We begin with a presentation of in-situ warm spillover beam measurements of the Advanced ACT receiver, which have been used to improve the optical designs of future telescopes. We then discuss the design, models, and fabrication development of metamaterial-based, silicon-substrate, Fabry-Perot interferometers for CCAT-prime's [CII] LIM instrument. We then describe the characterization of prototype superconducting transition edge sensors (TES) for Simons Observatory including, critical temperature, saturation power, time constant, and complex impedance measurements. The dissertation concludes with a brief discussion of the cosmology and astrophysics science goals that these technologies will enable when they are deployed on microwave telescopes in the coming years.
Download or read book NgVLA written by Eric James Murphy and published by . This book was released on 2018 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:
