Author: Robert Paul WagnerPublisher:
ISBN:
Category :
Languages : en
Pages : 58
Book Description
A Pilot Radio Telescope Search for Halo Axions
Author: Robert Paul WagnerA Search for Halo Axions
Author: Edward John DawPracticum elementaire statistiek
Author: Status of the Large-scale Dark-matter Axion Search
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
If axions constitute the dark matter of our galactic halo they can be detected by their conversion into monochromatic microwave photons in a high-Q microwave cavity permeated by a strong magnetic field. A large-scale experiment is under construction at LLNL to search for halo axions in the mass range 1.3 - 13[mu]eV, where axions may constitute closure density of the universe. The search builds upon two pilot efforts at BNL and the University of Florida in the late 1980's, and represents a large improvement in power sensitivity ([approximately]50) both due to the increase in magnetic volume (B[sup 2]V= 14 T[sup 2]m[sup 3]), and anticipated total noise temperature (T[sub n][approximately]3K). This search will also mark the first use of multiple power-combined cavities to extend the mass range accessible by this technique. Data will be analyzed in two parallel streams. In the first, the resolution of the power spectrum will be sufficient to resolve the expected width of the overall axion line, [approximately][bigcirc] (1kHz). In the second, the resolution will be[bigcirc](O.01-1 Hz) to look for extremely narrow substructure reflecting the primordial phase-space of the axions during infall. This experiment will be the first to have the required sensitivity to detect axions, for plausible axion models.
Scientific and Technical Aerospace Reports
Author: Physics Briefs
Author: Astronomy and Astrophysics in the New Millennium
Author: National Research CouncilPublisher: National Academies Press
ISBN: 0309070376
Category : Science
Languages : en
Pages : 401
Book Description
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.
In Search of Dark Matter
Author: Ken FreemanPublisher: Springer Science & Business Media
ISBN: 0387276181
Category : Science
Languages : en
Pages : 164
Book Description
Written for the educated non-scientist and scientist alike, it spans a variety of scientific disciplines, from observational astronomy to particle physics. Concepts that the reader will encounter along the way are at the cutting edge of scientific research. However the themes are explained in such a way that no prior understanding of science beyond a high school education is necessary.
Stars as Laboratories for Fundamental Physics
Author: Georg G. RaffeltPublisher: University of Chicago Press
ISBN: 9780226702728
Category : Science
Languages : en
Pages : 692
Book Description
Much of what we know about neutrinos is revealed by astronomical observations, and the same applies to the axion, a conjectured new particle that is a favored candidate for the main component of the dark matter of the universe.
Atlas of Galactic Neutral Hydrogen
Author: Dap HartmannPublisher: Cambridge University Press
ISBN: 9780521471114
Category : Science
Languages : en
Pages : 252
Book Description
Containing maps showing the distribution of emissions from atomic hydrogen, this is an important reference source for astronomers in many different fields of research.Atomic hydrogen, the principal component of the interstellar medium, was measured over a 5-year period using the 25-meter radio telescope of the NFRA. Displayed in several projections, each map corresponds to a particular velocity interval.A CD-ROM also accompanies the Atlas, and contains the entire dataset of the Leiden/Dwingeloo survey, color images in GIF format, and animations displaying the 3-dimensional data cube.