نتایج جستجو برای: astronomical catalogues
تعداد نتایج: 10370 فیلتر نتایج به سال:
Version three of the U.S. Naval Observatory CCD Astrograph Catalog (UCAC3) was released in August 2009. As the first version of the UCAC to cover the entire sky, UCAC3 is a suitable source of optical reference stars in the R = 8 to 16 magnitude range. Containing just over 100 million objects and providing stellar positional accuracies of about 15 to 100 milliarcseconds (mas) per coordinate, UCA...
Motivated by a discrepancy of five orders of magnitude between three different hyperpolarizability measurements on the CGO fullerene, we calculated the optical response of this cluster using a tight-binding Hamiltonian and compared the results to those for a benzene molecule. Our Hamiltonian reproduces the linear polarizability and hyperpolarizability of benzene reasonably well. For C60, our ca...
This paper serves as a survey of enclosure-type methods used to determine the obstacles or inclusions embedded in the background medium from the near-field measurements of propagating waves. A type of complex geometric optics waves that exhibits exponential decay with distance from some critical level surfaces (hyperplanes, spheres or other types of level sets of phase functions) are sent to pr...
Galactic winds are a prime suspect for the metal enrichment of the intergalactic medium and may have a strong influence on the chemical evolution of galaxies and the nature of QSO absorption line systems. We use a sample of 1406 galaxy spectra at z ∼ 1.4 from the DEEP2 redshift survey to show that blueshifted Mg ii λλ 2796, 2803 Å absorption is ubiquitous in starforming galaxies at this epoch. ...
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