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Detection Of The Near Ir Cosmic Infrared Background Using Alternative Models Of Near Ir Galactic Emission In The Dirbe Data
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721510573 Total Pages :34 pages Book Rating :4.5/5 (15 download)
Book Synopsis Detection of the Near-IR Cosmic Infrared Background Using Alternative Models of Near-IR Galactic Emission in the Dirbe Data by : National Aeronautics and Space Administration (NASA)
Download or read book Detection of the Near-IR Cosmic Infrared Background Using Alternative Models of Near-IR Galactic Emission in the Dirbe Data written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis portion of this task has been completed. New models were developed for the removal of the near-infrared emission of Galactic stars in the DIRBE data. Subtraction of these models from the observed emission attempted to achieve a better detection of the Cosmic Infrared Background at near-infrared wavelengths. The new models were found to provide a large improvement in the isotropy of the residual emission, however constraints on the intensity of the emission are not significantly improved. A paper detailing the procedures and results has been drafted, and will be completed next year. The draft of this paper is included as the final report on the contract. Arendt, Richard G. and Dwek, Eli and Oliversen, Ronald J. (Technical Monitor) Goddard Space Flight Center RTSC-3458
Book Synopsis Detection of the Near-Ir Cosmic Infrared Background Using Alternative Models of Near-Ir Galactic Emission in the Dirbe Data by : Nasa Technical Reports Server (Ntrs)
Download or read book Detection of the Near-Ir Cosmic Infrared Background Using Alternative Models of Near-Ir Galactic Emission in the Dirbe Data written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-08 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis portion of this task has been completed. New models were developed for the removal of the near-infrared emission of Galactic stars in the DIRBE data. Subtraction of these models from the observed emission attempted to achieve a better detection of the Cosmic Infrared Background at near-infrared wavelengths. The new models were found to provide a large improvement in the isotropy of the residual emission, however constraints on the intensity of the emission are not significantly improved. A paper detailing the procedures and results has been drafted, and will be completed next year. The draft of this paper is included as the final report on the contract.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721242788 Total Pages :34 pages Book Rating :4.2/5 (427 download)
Book Synopsis Empirical Constraints on the Cosmic Infrared Background Using Near-Infrared Dirbe Data by : National Aeronautics and Space Administration (NASA)
Download or read book Empirical Constraints on the Cosmic Infrared Background Using Near-Infrared Dirbe Data written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-16 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Empirical models for emission from stars and the ISM are subtracted from the zodiacal-light-subtracted DIRBE 3.5 pm emission. Because the models are contaminated by unknown levels of the CM at other near-IR wavelength, the residual is not simply the 3.5 Jim Cosmic IR Background, but a linear combination of the background levels at several wavelengths. In spite of this, the residual can be used to place limits on the near-IR CIB intensity if its spectral shape is assumed. Additionally, the residual level is shown to be more nearly isotropic than previous estimates over a much larger fraction of the sky. An excellent correlation of near-IR and far-IR ISM emission provides evidence of the high accuracy of the brighter stellar emission model. The possibility that any residual emission is zodiacal in nature is discussed. Arendt, Richard G. Goddard Space Flight Center
Book Synopsis The Cosmic Infrared Background ExpeRiments by : Chi Hanh Nguyen
Download or read book The Cosmic Infrared Background ExpeRiments written by Chi Hanh Nguyen and published by . This book was released on 2021 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The ensemble emission from all sources outside of the Milky Way is known as the extragalactic background light (EBL). At optical and near-infrared (NIR) wavelengths, the EBL is primarily stellar emission tracing back to the Epoch of Reionization (EOR) at redshifts z > 6 when the first luminous structures formed. Given the large uncertainties in our understanding of the EOR, measurements of the EBL provide an important probe of the galaxies that were responsible for reionization. Direct observations of the EBL are challenging due to contamination from bright local foregrounds. In recent years, intensity mapping has emerged as a successful technique in which EBL fluctuations are measured on large angular scales where the known foreground contributions are minimal or well-modeled. To isolate the signals from EOR structures, intensity mapping can be applied to optical and NIR data to probe rest-frame UV emission in galaxies at z > 6. Multiple intensity mapping studies including the first Cosmic Infrared Background ExpeRiment (CIBER-1) have found that the optical/NIR EBL intensity and its large-scale fluctuations exceed predictions from galaxy models. The excess is above EOR level and also persists at wavelengths
Book Synopsis Joint Evolution of Black Holes and Galaxies by : M. Colpi
Download or read book Joint Evolution of Black Holes and Galaxies written by M. Colpi and published by CRC Press. This book was released on 2006-01-27 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Black holes are among the most mysterious objects that the human mind has been capable of imagining. As pure mathematical constructions, they are tools for exploiting the fundamental laws of physics. As astronomical sources, they are part of our cosmic landscape, warping space-time, coupled to the large-scale properties and life cycle of their host
Book Synopsis The Impact of Near-Infrared Sky Surveys on Galactic and Extragalactic Astronomy by : N. Epchtein
Download or read book The Impact of Near-Infrared Sky Surveys on Galactic and Extragalactic Astronomy written by N. Epchtein and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thirty years after the pioneering enterprise of Neugebauer and collabo rators, the astronomical sky is surveyed anew in the near infrared range with a gain in sensitivity greater than 4 orders of magnitude. Data have started to come through the "pipelines" routinely and at the turn of the century, the astronomical community will be provided with immense databases that will eventually contain accurate positions and 3- colour (or even 4-colour after merging DENIS and 2MASS data) photometry for hundreds million of stars and millions of galaxies. This fantastic harvest of data will eventually result of the huge effort that has been deployed on both sides of the Antlantic to promote 2 major projects, 2MASS and DENIS. rd The basic aim of this 3 Euroconference (and last in the series), was to put in close contact the scientific teams of 2MASS and DENIS in order to present and discuss the first significant results of the two surveys and to start promoting possible future plans
Author :Space Telescope Science Institute (U.S.). Symposium Publisher :Cambridge University Press ISBN 13 :9780521630979 Total Pages :328 pages Book Rating :4.6/5 (39 download)
Book Synopsis The Hubble Deep Field by : Space Telescope Science Institute (U.S.). Symposium
Download or read book The Hubble Deep Field written by Space Telescope Science Institute (U.S.). Symposium and published by Cambridge University Press. This book was released on 1998-10-13 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Hubble Deep Field (HDF) is the deepest optical image of the Universe ever obtained. It is the result of a 150-orbit observing programme with the Hubble Space Telescope. It provides a unique resource for researchers studying the formation and evolution of stars and galaxies. This timely volume provides the first comprehensive overview of the HDF and its scientific impact on our understanding in cosmology. It presents articles by a host of world experts who gathered together at an international conference at the Space Telescope Science Institute. The contributions combine observations of the HDF at a variety of wavelengths with the latest theoretical progress in our understanding of the cosmic history of star and galaxy formation. The HDF is set to revolutionize our understanding in cosmology. This book therefore provides an indispensable reference for all graduate students and researchers in observational or theoretical cosmology.
Book Synopsis Astronomy in the Near-Infrared - Observing Strategies and Data Reduction Techniques by : Jochen Heidt
Download or read book Astronomy in the Near-Infrared - Observing Strategies and Data Reduction Techniques written by Jochen Heidt and published by Springer Nature. This book was released on 2022-07-04 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Near-infrared astronomy has become one of the most rapidly developing branches in modern astrophysics. Innovative observing techniques, near-infrared detectors with quantum efficiencies in excess of 90%, highly specialised instruments as well as advanced data reduction techniques have allowed major breakthroughs in various areas like exoplanets, star-forming regions, the supermassive black hole in the Galactic center, and the high-redshift Universe. In this book, the reader will be introduced to the basic concepts of how to prepare near-infrared observations with maximized scientific return. Equal weight is given to all aspects of the data reduction for both - imaging and spectroscopy. Information is also provided on the state of the art instrumentation available and planned, on detector technology or the physics of the atmosphere, all of which influence the preparation and execution of observations and data reduction techniques. The beginner but also the expert will find a lot of information in compact form which is otherwise widely dispersed across the internet or other sources.
Book Synopsis Infrared Astronomy with Arrays by : Ian S. McLean
Download or read book Infrared Astronomy with Arrays written by Ian S. McLean and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: The idea for another conference on the theme of Infrared Astronomy with Arrays actually goes back to March 1987. At a party held in my home at the end of the Hilo conference, excitement was running high and everyone present was in favor of another meeting. I recall suggesting to Al Fowler that the next meeting could be in Tucson. Despite Al's reply to the effect that Hawaii was a much nicer location, a meeting was held in Tucson three years later. That meeting focussed more on the astrophysics which had been accomplished with the detectors, rather than on techniques and methods. However, it was already apparent in February of 1990 that a new generation of larger m arrays would soon supersede the 64x64 class of devices and so, having just moved from the UK Infrared Telescope unit in Hawaii to join with Eric Becklin in his move to UCLA, it seemed to me that another Hilo-style conference was appropriate, and Eric agreed.
Book Synopsis The Spectral Energy Distribution of Galaxies - SED 2011 (IAU S284) by : Richard J. Tuffs
Download or read book The Spectral Energy Distribution of Galaxies - SED 2011 (IAU S284) written by Richard J. Tuffs and published by Cambridge University Press. This book was released on 2012-08-30 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent observational developments are providing the first truly panchromatic view of galaxies, extending from the radio to TeV gamma-rays. This is motivating the development of new models for the interpretation of spectral energy distributions (SEDs) of galaxies in terms of the formation, evolution and emission of stellar and accretion-driven sources of photons, the interaction of the photons with the gaseous and dust components of the interstellar medium, and high-energy processes involving cosmic rays. IAU Symposium 284 details progress in the development of such models, their relation to fundamental theory, and their application to the interpretation of the panchromatic emission from the Milky Way and nearby galaxies, connecting the latter with models for the evolution of the SEDs of distant galaxies, and the extragalactic background light. IAU S284 is a useful resource for all researchers working with the copious amounts of multiwavelength data for galaxies now becoming available.
Book Synopsis Finding Signal in the Noise by : Gregory Mosby (Jr.)
Download or read book Finding Signal in the Noise written by Gregory Mosby (Jr.) and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ground-based optical and near infrared observational astronomy is naturally limited by the Earth's atmosphere and the vast distances of the objects to be studied. Technically, we are also limited by the precision and accuracy of our instrumentation. In this thesis, I describe strategies to move observational astronomy forward in light of these limitations. Specifically, I present a method of stellar population analysis that is precise and accurate in the limit of low signal-to-noise with an emphasis on faint quasar host galaxy spectra. I present an investigation and test of a simple model of persistence in HgCdTe detector arrays aimed at the removal of this spurious signal from data. Finally, I present an overview of the Robert Stobie Spectrograph Near InfraRed (RSS-NIR) instrument's detector system that I have optimized for low read noise and background limited performance. The advancement of observational astronomy will always be limited by our ability to efficiently detect the signals we need. This thesis reviews the progress made to enhance ground-based astronomy capability.
Book Synopsis The X-ray Background by : Xavier Barcons
Download or read book The X-ray Background written by Xavier Barcons and published by Cambridge University Press. This book was released on 1992-07-31 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of the current observational knowledge and understanding of the cosmic X-ray background.
Book Synopsis The Infrared and Submillimetre Sky after COBE by : M. Signore
Download or read book The Infrared and Submillimetre Sky after COBE written by M. Signore and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Les Houches, France, March 20-30, 1991
Book Synopsis Astrophysics with Infrared Arrays by : Richard Elston
Download or read book Astrophysics with Infrared Arrays written by Richard Elston and published by . This book was released on 1990 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a Near Infrared Camera for Conducting a Survey of Northern Galactic Cepheid Variable Stars by : Andrew John Monson
Download or read book Development of a Near Infrared Camera for Conducting a Survey of Northern Galactic Cepheid Variable Stars written by Andrew John Monson and published by . This book was released on 2009 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past few decades there has been growing realization that the Cepheid Near-Infrared (NIR) Period-Luminosity (PL) relation is superior to the Optical PL relation, however, there has been little to no new NIR data gathered on Galactic Cepheids despite the growing popularity and availability of NIR detectors. Galactic Cepheids are, in general, too bright to be observed by telescopes with apertures larger than 1-meter and most NIR detector arrays are too costly to justify placing on sub-1m class telescopes. I describe the development of a near-infrared (NIR) camera for the University of Wyoming's 0.6m telescope at Red Buttes Observatory. The camera, known as BIRCAM (Buttes InfraRed CAMera), was conceived to be a temporary, inexpensive test-bed instrument designed to test the electronic and cryo-mechanical components of another large-scale NIR imaging camera. BIRCAM was designed to make use of a CMOS HgCdTe Hawaii-2 detector array sensitive from 0.9-2.5 microns and during its relatively short lifetime I used BIRCAM to synoptically survey 130 fields containing Galactic Cepheids. These data will help provide the means to calibrate the NIR Cepheid Period-Luminosity Relation. The Cepheid Period-Luminosity (PL) Relation is fundamental to determining distances to nearby galaxies and as such is essential to calibrating the distance scale of the Universe. The accuracy and precision of the distance scale is determined in part by the accuracy and precision of the Galactic PL relation. Observations of Galactic Cepheids in the NIR play an important role in reducing systematic errors inherent to optical observations. The future calibration and refinement of the distance scale relies on providing accurate NIR photometry of Galactic Cepheid Variable Stars. Current photometric studies of Galactic Cepheids in the NIR are limited in size and homo-geneity. The goal of this project is to provide a homogenous photometric study that triples the number of well-sampled Galactic Cepheid light-curves. In conjunction with future astrometric data from GAIA and/or SIM these data will enable the accurate and precise calibration of the Galactic NIR Cepheid Period-Luminosity Relation. I have obtained the NIR light-curves for 131 Northern Galactic Cepheids. With these light-curves I have determined the mean intensity weighted NIR magnitudes and using a subset of 19 Galactic Cepheids with currently known distances and extinctions I have created a Galactic NIR PL relation. The NIR PL relation determined shows a dispersion of 0.13 mag and a slope which is indistinguishable from that of Cepheids in the Large Magellanic Cloud (LMC). The scatter is as small as any survey to date and attests to the quality of the survey data and the potential of the full data set. I have used the Galactic NIR PL relation to determine a distance modulus of 18:49 ± 0:06 to the LMC, consistent with the generally accepted value. I also report on the serendipitous photometric discovery of 72 previously unclassified Galactic Variables. The individual data for each star are presented in the Supplemental Data document available upon request to the author.
Book Synopsis Near IR Emission from Nuclear Starburst Galaxies by : Alan M. Watson
Download or read book Near IR Emission from Nuclear Starburst Galaxies written by Alan M. Watson and published by . This book was released on 1994 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics of Thermal Gaseous Nebulae by : L.H. Aller
Download or read book Physics of Thermal Gaseous Nebulae written by L.H. Aller and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gaseous nebulae offer outstanding opportunities to atomic physicists, spectroscopists, plasma experts, and to observers and theoreticians alike for the study of attenuated ionized gases. These nebulae are often dusty, heated by radiation fields and by shocks. They are short-lived phenomena on the scale of a stellar lifetime, but their chemical compositions and internal kinematics may give important clues to advanced stages of stellar evolution. The material herein presented is based on lectures given at the University of Michigan, University of Queensland, University of California, Los Angeles, and in more abbreviated form at the Raman Institute, at the Scuola Internazionale di Trieste, and elsewhere. Much of it is derived origionally from the series "Physical Processes in Gaseous Nebulae" initiated at the Harvard College Observatory in the late 1930s. I have tried to emphasize the basic physics of the mechanisms involved and mention some of the uncertainties that underlie calculations of many basic parameters. Emphasis is placed on ionized plasmas with electron temperatures typically in the neighborhood of 10,OOOoK. Dust and other ingredients of the cold component of the interstellar medium are treated briefly from the point of view of their relation to hot plasmas of H II regions and planetaries. Chemical composition determinations for nebulae are discussed in some detail while the last section deals with interpretations of elemental abundances in the framework of stellar evolution and nucleogenesis. Gaseous nebulae offer some particularly engaging opportunities for studies of stellar evolution.
