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Topic: Cosmic Anisotropy Telescope


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In the News (Wed 23 Dec 09)

  
  Cosmic microwave background radiation - Biocrawler   (Site not responding. Last check: 2007-11-07)
The cosmic microwave background radiation (CMB) is a form of electromagnetic radiation that fills the whole of the universe.
The period after the emission of the CMB and the observation of the first stars is semi-humorously referred to by cosmologists as the dark age, and is a period which is under intense study by astronomers.
Of these experiments, the Cosmic Background Explorer (COBE) satellite that was flown in 1989-1996 is probably the most famous and which made the first detection of the large scale anisotropies (other than the dipole).
www.biocrawler.com /encyclopedia/CMB   (1677 words)

  
 F A C U L T A D   d e   C I E N C I A S   A S T R O N Ó M I C A S   y   G E O F ...
The Chandra X-ray Observatory is the U.S. follow-on to the Einstein Observatory.
The original low frequency telescope was superseded in 1976 by a 14-m diameter radome-enclosed antenna for use at high radio frequencies (mm wavelengths), built primarily to study the physics and chemistry of interstellar clouds, circumstellar envelopes, planetary atmospheres, and comets.
Michelle: A mid-infrared spectrometer and imager for the UKIRT and Gemini telescopes
www.fcaglp.unlp.edu.ar /extension/links/telescopes.html   (8324 words)

  
 : Anisotropy, review at WorldSSP.net   (Site not responding. Last check: 2007-11-07)
The Cosmic Anisotropy Telescope The Cosmic Anisotropy Telescope (CAT) was the first interferometer to measure fluctuations in the cosmic microwave background (CMB).
Seismic anisotropy of the deep crust and upper mantleGuilhem Barruol (Chargé de Recherches, CNRS) Jérome Bascou (PhD student) Maggy Heintz (PhD student) David Mainprice (Directeur de Recherche, CNRS) Andrea Tommasi (Chargée de Recherches, CNRS) Alain Vauchez (Maitre de Conférences, Université Montpellier II) Seismic anisotropy m...
Anisotropy in Electromagnetic Interactions* Information on an apparent electromagnetic asymmetry *by Borge Nodland A type of symmetry breaking appears to be present in the propagation of electromagnetic waves over vast distances.
www.worldssp.net /webinfo.asp?proid=2031   (482 words)

  
 SPT: Science   (Site not responding. Last check: 2007-11-07)
A new 10 meter diameter telescope is being constructed for deployment at the NSF South Pole research station.
The telescope is designed for conducting large-area millimeter and sub-millimeter wave surveys of faint, low contrast emission, as required to map primary and secondary anisotropies in the cosmic microwave background.
The WMAP data, especially combined with finer angular scale CMB anisotropy measurements made with ACBAR and CBI and with other probes of large scale structure have provided a high degree of confidence in the now standard cosmological model and allowed tight constraints to be placed on many of its parameters.
spt.uchicago.edu /science/index.html   (1221 words)

  
 Cosmic Ray Modulation
Cosmic rays enter the heliosphere due to random motions and diffuse inward toward the Sun, gyrating around the interplanetary magnetic field (IMF) and scattering at irregularities in the field.
Thus Equation 4 is an equation explicitly representing the transport of cosmic rays in the heliosphere by convection, diffusion and drift.
Figure 10 shows the components of the anisotropy as viewed from the Earth and Figure 11 shows the geometry of the Earth's orbit which must also be included in an analysis of the anisotropy.
www.atnf.csiro.au /pasa/18_1/duldig/paper/node5.html   (4430 words)

  
 Report of Cosmic Microwave Background Session
Anisotropy measurements with the ten meter will be essential if the universe is open.
Also, this telescope may be the only instrument with enough sensitivity at high frequencies to separate thermal S-Z sources from primary anisotropy.
With this telescope we will be breaking new ground, observing at higher frequency with a finer beam, and with higher sensitivity than has been available before.
cfa-www.harvard.edu /~aas/tenmeter/cosmic.htm   (1215 words)

  
 Astronomy and cosmology: Observational facilities
Liverpool Telescope, is a 2-metre robotically controlled telescope being constructed on La Palma, which can be used by schools as well as researchers.
Telescopes in space avoid the blurring effects of the atmosphere.
One of the reasons large telescopes are built to observe in the infrared is that - because of the effect of redshift - a larger proportion of the light from the most distant regions of the Universe is in the infrared.
www.pparc.ac.uk /ps/aac/aac_telescopes_of.asp   (915 words)

  
 CfCP: Research
The first is the detection of the polarization of the CMB anisotropy which is predicted to exist and provides important, independent information about early Universe physics beyond the anisotropy.
The second theme is the detection of the anisotropy of the cosmic infrared background radiation (CIBR) produced by young galaxies.
The anisotropy of the CIBR is key to probing the evolution of structure formation and testing the standard paradigm (cold dark matter) and will be studied with the EDGE experiment.
cfcpwork.uchicago.edu /research/cosmicradiation   (433 words)

  
 NASA - Hubble Space Telescope
It is a reflecting telescope with a light-gathering mirror 94 inches (240 centimeters) in diameter.
The telescope is named after American astronomer Edwin P. Hubble, who made fundamental contributions to astronomy in the 1920's.
The telescope transmits the data by radio to astronomers on the ground.
www.nasa.gov /worldbook/hubble_telescope_worldbook.html   (864 words)

  
 WMAP Cosmology 101: Cosmic Microwave Background
When the visible universe was one hundredth of its present size, the cosmic microwave background was a hundred times hotter (273 degrees above absolute zero or 32 degrees Fahrenheit, the temperature at which water freezes to form ice on the Earth's surface).
In addition to this cosmic microwave background radiation, the early universe was filled with hot hydrogen gas with a density of about 1000 atoms per cubic centimeter.
Cosmologists studying the cosmic microwave background radiation can look through much of the universe back to when it was opaque: a view back to 400,000 years after the Big Bang.
map.gsfc.nasa.gov /m_uni/uni_101bbtest3.html   (1150 words)

  
 Cosmic microwave background experiments - Wikipedia, the free encyclopedia
Cosmic background radiation temperature on the celestial sphere as determined with the COBE satellite, (top) uncorrected, (middle) corrected for the dipole term due to our peculiar velocity, (bottom) corrected for contributions from the dipole term and from our galaxy.
The discovery of the cosmic microwave background was the serendipitous result of an experiment by Arno Penzias and Robert Woodrow Wilson at Bell Telephone Laboratories in 1964.
The most famous experiment is probably the NASA Cosmic Background Explorer (COBE) satellite that orbited in 1989–1996 and which first detected the large scale anisotropies (other than the dipole).
en.wikipedia.org /wiki/Cosmic_microwave_background_experiments   (1004 words)

  
 Radio Astronomy   (Site not responding. Last check: 2007-11-07)
Combined, the two telescopes routinely cover the entire millimeter and submillimeter windows from about 4.6 mm to about 0.6 mm, and at the HHSMT observations can be made all the way to 0.3 mm with PI instruments.
The synthesis telescope is particularly suited to comprehensive studies of the interstellar medium, extended Galactic nebulae and star-forming regions, and of nearby galaxies.
The radio telescope at Radio Astronomy at the University of Indianapolis is a 5 meter educational radio telescope.
www.vilspa.esa.es /astroweb/yp_radio.html   (5759 words)

  
 Physics & Astronomy - University of Pennsylvania
We have also built our own telescopes which carry these receivers to such remote locations as 120,000 ft above the earth on high-altitude balloons or on mobile platforms to observe on 17,000 ft mountain tops in Chile.
MAT is a 1 meter telescope designed specifically to search for anisotropy in the Cosmic Microwave Background.
Devlin, M.J., Clapp, A.C., Gundersen, J.O., Hagmann, C.A., Lubin, P.M., Mauskopf, P.D., Meinhold, P.R., Richards, P.L., Smoot, G.F., Tanaka, S.T., Timbie, P.T., Wuenche, C.A., ``Measurements of Anisotropy in the Cosmic Microwave Background Radiation at 0.5 Degree Angular Scales Near the Star Gamma Ursae Minoris,'' Ap.
dept.physics.upenn.edu /facultyinfo/devlin_new.html   (1004 words)

  
 Cosmic Genesis and Fundamental Physics Project Proposals
A major source of data on the shape of the universe will come from measurements of the anisotropy of the cosmic microwave background.
Robert Streitmatter from NASA reported on a score of cosmic rays of energy so high they were thought forbidden by theory -- the Fly's Eye detector in Utah has captured an event packing 51 joules of energy.
Kolb's message was that a new unification of inner space and outer space studies is essential to carry on the work of fundamental physics, the elucidation of nature itself.
enews.lbl.gov /Science-Articles/Archive/cosmic-genesis.html   (858 words)

  
 H i R e s - High Resolution Fly's Eye Project - Links
A real science exploration of the hole in the ozone and the deadly cosmic rays that are getting in through it...
Cosmic ray / Gamma ray / Neutrino and similar experiments.
Particles and high-energy light that bombard the Earth from anywhere beyond its atmosphere are known as cosmic rays.
www.cosmic-ray.org /links.html   (97 words)

  
 CAT HomePage   (Site not responding. Last check: 2007-11-07)
The Cosmic Anisotropy Telescope (CAT) was the first interferometer to measure fluctuations in the cosmic microwave background (CMB).
Baker et al 1999 The second CAT CMB results.
The successor telescope to the CAT is the
www.mrao.cam.ac.uk /telescopes/cat   (63 words)

  
 Telescopes
The KLENOT telescope was constructed using a 1.06-m primary mirror and a primary focus corrector to obtain a plane field of view 33 x 33 arcminutes.
The Large Binocular Telescope (LBT) is a collaboration between Arizona (25%), Italy (25%, represented by the Arcetri Astrophysical Observatory in Florence), Research Corporation (12.5%), the Ohio State University (12.5%), and Germany (25%, represented by the LBT Beteiligungsgesellschaft).
The SOAR telescope is a Project for a 4.2-meter aperture telescope funded by a partnership between the USA National Optical Astronomy Observatories (NOAO), the Country of Brazil, Michigan State University, and the University of North Carolina at Chapel Hill.
www.cv.nrao.edu /fits/www/yp_telescope.html   (12332 words)

  
 The Ultimate Cosmic microwave background radiation Dog Breeds Information Guide and Reference
It is mostly due to the motion of the observer against the CMB, which is some 700 km/s for the Earth.
COsmic Background Explorer : NASA's COBE (Cosmic Background Explorer) satellite.
Hu, Wayne, "Introduction to the Cosmic Microwave Background.
www.dogluvers.com /dog_breeds/CMB   (1430 words)

  
 LAMBDA - CMB Experiment Sites   (Site not responding. Last check: 2007-11-07)
COBE (Cosmic Background Explorer) was developed by NASA's Goddard Space Flight Center to measure the diffuse infrared and microwave radiation from the early universe.
The basic scientific goal of the Planck mission is to measure CMB anisotropies at all angular scales larger than 5 to 10 arcminutes over the entire sky with a precision of ~2 parts per million.
WMAP (Wilkinson Microwave Anisotropy Probe) is designed to determine the geometry, content, and evolution of the universe via a 13 arcminute FWHM resolution full sky map of the temperature anisotropy of the cosmic microwave background radiation.
lambda.gsfc.nasa.gov /links/experimental_sites.cfm   (201 words)

  
 Radio Astronomy
AST/RO is a 1.7 meter diameter off-axis telescope for research in astronomy and aeronomy at wavelengths between 200 microns and 2 mm.
Two telescopes are now in operation, the Vatican Observatory/Arizona 1.8m Lennon telescope (VATT) and the 10m diameter Heinrich Hertz Submillimeter Telescope (SMT), a joint project of Arizona and the Max-Planck-Institut für Radioastronomie, Germany.
It is designed to image the anisotropies of the Cosmic Background Radiation Field over the whole sky, with unprecedented sensitivity and angular resolution.
www.cv.nrao.edu /fits/www/yp_radio.html   (7170 words)

  
 Radio Telescopes
It was famous for discovering some of the most distant known objects in the Universe, and the longest-running SETI project.
CAT - the first interferometer to measure fluctuations in the cosmic microwave background
The 15 m JCMT is situated close to the summit of Mauna Kea, Hawaii, and is the largest sub millimetre radio telescope in the world.
www.r-clarke.org.uk /astrolinks_radio.htm   (372 words)

  
 5.6 The Cosmic Anisotropy Telescope
The Cosmic Anisotropy Telescope (CAT) is a three element, ground-based interferometer telescope, of novel design [85].
Accurate information on the point source contribution to the CAT2 field maps, which contain sources at much lower levels, has been obtained by surveying the fields with the Ryle Telescope at Cambridge, and the multi-frequency nature of the CAT data can be used to separate the remaining CMB and Galactic components.
When interpreting this map, however, it should remembered that for an interferometer with just three horns, the `synthesised' beam of the telescope has large sidelobes, and it is these sidelobes that cause the regular features seen in the map.
www.univie.ac.at /EMIS/journals/LRG/Articles/lrr-1998-11/node13.html   (450 words)

  
 Baksan Underground Scintillation Telescope
Anisotropy of cosmic rays at energy about 2 TeV as measured by the Baksan underground scintillation telescope,
Intensity of cosmic ray muons and of primary nucleons according to data from the Baksan underground scintillation telescope,
Intensity and angular distribution of cosmic ray muons according to data of the Baksan scintillation telescope,
www.nu.to.infn.it /exp/all/baksan   (1126 words)

  
 2.1 Cosmic Anisotropy Telescope   (Site not responding. Last check: 2007-11-07)
The Cosmic Anisotropy Telescope (CAT) has operated extremely successfully, producing the first image of CMB fluctuations on intermediate angular scales (Scott et al.
Observations of the CAT1 field at 13.5, 15.5 and 16.5 GHz have given measurements of the CMB angular power spectrum on the smallest scales so far obtained, with important cosmological implications (see Sections 1.1.1 and 1.1.4).
Technically, the operation of the CAT has given us invaluable experience in the problems and realities of short-baseline interferometry, which have had a major impact on the design of the Very Small Array, currently under construction.
www.mrao.cam.ac.uk /publications/annrep97/node7.html   (218 words)

  
 Astronomy Resources from Grau-Hall Scientific
Meanwhile, you might take a moment to contemplate the impending demise of the Hubble telescope and the wasting of $200,000,000 worth of instruments which have already been constructed for it but for which NASA has no plans to deliver and instal on Hubble.
One also wonders why it is that NASA can't use some tugbot (robot tugboat) to pull the thing into an orbiting junkyard near the space station rather than figuring out how to drop this 24,000 pounds of equipment onto Earth without hitting someone with the pieces.
Starcatcher - galaxies, nebulae and several stars captured by near-infrared telescopes in Arizona and Chile from 2MASS, a three-and-a-half-year all-sky survey.
www.grauhall.com /astronomy.htm   (694 words)

  
 Australian Cosmic Ray Modulation Research
Australian research into variations of the cosmic ray flux arriving at the Earth has played a pivotal role for more than 50 years.
The work has been largely led by the groups from the University of Tasmania and the Australian Antarctic Division and has involved the operation of neutron monitors and muon telescopes from many sites.
Particular highlights include: the determination of cosmic ray modulation parameters; the development of modelling techniques of Ground Level Enhancements; the confirmation of the Tail-In and Loss-Cone Sidereal anisotropies; the Space Ship Earth collaboration; and the Solar Cycle latitude survey.
www.atnf.csiro.au /pasa/18_1/duldig/paper   (156 words)

  
 Stargazer MMIII No. 6
  CAT is a 3-element interferometer operating at frequencies between 13 and 17 GHz (on baselines of 1 to 5  meters.)  CAT measures early, primordial temperature variations in the cosmic microwave background radiation, and is located at the Mullard Radio Astronomy Observatory in Cambridge, England.
They were small and hard to find, but with the help of some new  telescopic equipment and cameras, UBC professor Brett Gladman,  Lynne Allen, and Dr. J.J. Kavelaars have discovered nine  previously unknown moons of Jupiter.
Their  small size and distance from the Sun prevent the satellites from  shining any brighter than 24th magnitude, about 100 million times  fainter than can be seen with the unaided eye.
members.tripod.com /everett_astronomy/stargazer_mmiii_06.htm   (6039 words)

  
 [No title]
See the Second Cambridge Pulsar Survey carried out with the 3.6 hectare array in Cambridge (the telescope which discovered the first pulsar).
I was a member of the design and construction team for this instrument, which made the first high resolution images of the cosmic microwave background.
This is a design study for a multi-beam broadband radio telescope using an array of 'smart' electrically short dipoles and a good deal of DSP.
radio.astro.gla.ac.uk /research.html   (356 words)

  
 Background Imaging of Cosmic Extragalactic Polarization
"BICEP (Background Imaging of Cosmic Extragalactic Polarization) is an experiment designed to measure the polarization of the cosmic microwave background (CMB) to unprecedented precision, and in turn answer crucial questions about the beginnings of the Universe.
The BICEP instrument is still in the design and planning stages but here is an image rendered from the preliminary AutoCAD model of the telescope.
Clicking on this image will get you a giant, 430k, version of the same render (suitable for making a smallish poster).
cosmology.berkeley.edu /group/swlh/bicep   (186 words)

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