Download or read book A Search for Small Angular Scale Anisotropy in Cosmic Background Radiation at 90 GHz from the South Pole written by Hiên Trọng Nguyên and published by . This book was released on 1993 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Anisotropy in the Cosmic Background Radiation on a Large Angular Scale at 33 GHz written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a measurement of anisotropy in the 3 °K cosmic background radiation on a large-angular-scale are presented. Observations were carried out with a dual-antenna microwave radiometer operating at 33 GHz (0.89 cm wavelength) flown on board a U-2 aircraft to 20-km altitude. In eleven flights, between December 1976 and May 1978, the radiometer measured differential intensity between pairs of directions distributed over most of the northern celestial hemisphere with an rms sensitivity of +- 46m°K/.sqrt. Hz. The measurements show clear evidence of anisotropy that is readily interpreted as due to the motion of the earth relative to the sources of the radiation; the anisotropy is well fit by a cosine distribution of amplitude 3.61 +- 0.54 millireverse arrowreverse arrow-degrees Kelvin (m°K), one part in 800 of 3°K, implying a velocity of 361 +- 54 km/sec toward the direction 11.23 +- 0.46 hours right ascension, and 19.0 +- 7.5° declination. A simultaneous fit to a combined hypothesis of dipole (cos theta) and quadrupole (cos2 theta) angular distributions places a 1 m°K limit on the amplitude of most components of quadruple anisotropy with 90% confidence. Additional analysis places a 0.5 m °K limit on uncorrelated fluctuations (sky-roughness) in the 3°K background on an angular scale of the antenna beam width, about 7°. This thesis describes the equipment development through three engineering flights and the data acquisition in eleven additional flights. The astrophysical results are then presented from the statistical analysis of the reduced data.
Download or read book A Measurement of Anisotropy in the Cosmic Background Radiation on a Large Angular Scale at 33 GHz written by Marc Victor Gorenstein and published by . This book was released on 1978 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Large Angular Scale Anisotropy in the Cosmic BackgroundRadiation written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the results of an extended series of airborne measurements of large-angular-scale anisotropy in the 3 K cosmic background radiation. Observations were carried out with a dual-antenna microwave radiometer operating at 33 GHz (0.89 cm wavelength) flown on board a U-2 aircraft to 20 km altitude. In eleven flights, between December 1976 and May 1978, the radiometer measured differential intensity between pairs of directions distributed over most of the northern hemisphere with an rms sensitivity of 47 mK Hz−12. The measurements show clear evidence of anisotropy that is readily interpreted as due to the solar motion relative to the sources of the radiation. The anisotropy is well fit by a first order spherical harmonic of amplitude 360 ± 50km sec−1 toward the direction 11.2 ± 0.5 hours of right ascension and 19 ± 8 degrees declination. A simultaneous fit to a combined hypothesis of dipole and quadrupole angular distributions places a 1 mK limit on the amplitude of most components of quadrupole anisotropy with 90% confidence. Additional analysis places a 0.5 mK limit on uncorrelated fluctuations (sky-roughness) in the 3 K background on an angular scale of the antenna beam width, about 7 degrees.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Anisotropy in the Cosmic Background Radiation at Millimeter Wavelengths on Angular Scales from 0 3 to 3 Degrees written by Marc Laurenz Fischer and published by . This book was released on 1991 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Anisotropy in the Cosmo Microwave Background on Angular Scales of 1 to 30 Arcminutes written by Steven T. Myers and published by . This book was released on 1990 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Anisotropy Measurements of the Cosmic Background Radiation at 3 Mm Wavelength and an Angular Scale of 30 Arcminutes written by Peter Russell Meinhold and published by . This book was released on 1990 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reports on Astronomy written by Jacqueline Bergeron and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: IAU Transactions are published as a volume corresponding to each General Assembly. Volume A is produced prior to the Assembly and contains Reports on Astronomy, prepared by each Commission President. The intention is to summarize the astronomical results that have affected the work of the Commission since the production of the previous Reports up to a time which is about one year prior to the General Assembly. Volume B is produced after the Assembly and contains accounts of Commission Meetings which were held, together with other material. The reports included in the present volume range from outline summaries to lengthy compilations and references. Most reports are in English.
Download or read book Measurements of the Cosmic Background Radiation written by Jeffrey Arthur Schuster and published by . This book was released on 1994 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cosmic Background Radiation Study Sunyaev Zel dovich Effect and Small Angular Scale Anisotropy written by George F. Smoot and published by . This book was released on 1986 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: A bolometer cooled by a He-3 refrigerator has been built to detect small anisotropies in the cosmic background radiation. This bolometer can be tested on ground-based instruments and is proposed to be eventually used on a shuttle-borne system. Reprints. (jhd).
Download or read book Beam Line written by and published by . This book was released on 1990 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antarctic Bibliography written by and published by . This book was released on 1997 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Large scale Anisotropy of the Cosmic Background Radiation at 3mm written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A balloon-borne differential radiometer has measured the large-scale anisotropy of the cosmic background radiation (CBR) with high sensitivity. The antenna temperature dipole anistropy at 90 GHz (3 mm wavelength) is 2.82 +- 0.19 mK, corresponding to a thermodynamic anistropy of 3.48 +- mK for a 2.7 K blackbody CBR. The dipole direction, 11.3 +- 0.1 hours right ascension and -5.7° +- 1.8° declination, agrees well with measurements at other frequencies. Calibration error dominates magnitude uncertainty, with statistical errors on dipole terms being under 0.1 mK. No significant quadrupole power is found, placing a 90% confidence-level upper limit of 0.27 mK on the RMS thermodynamic quadrupolar anistropy. 22 figures, 17 tables.
Download or read book Transactions of the International Astronomical Union written by International Astronomical Union and published by . This book was released on 1994 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
