منابع مشابه
Visibility of stars, halos, and rainbows during solar eclipses.
The visibility of stars, planets, diffraction coronas, halos, and rainbows during the partial and total phases of a solar eclipse is studied. The limiting magnitude during various stages of the partial phase is presented. The sky radiance during totality with respect to noneclipse conditions is revisited and found to be typically 1/4000. The corresponding limiting magnitude is +3.5. At totality...
متن کاملThe detection of sub-solar mass dark matter halos
Dark matter halos of sub-solar mass are the first bound objects to form in cold dark matter theories. In this article, I discuss the present understanding of “microhalos”, their role in structure formation, and the implications of their potential presence, in the interpretation of dark matter experiments. PACS numbers: 95.35.+d, 98.62Gq, 95.30.Cq, 98.80.-k, 98.70.Rz Submitted to: J. Phys. G: Nu...
متن کاملHalos and ice crystals
Observing cirrus halos to constrain in-situ measurements of ice crystal size T. J. Garrett, M. B. Kimball, G. G. Mace, and D. G. Baumgardner Department of Meteorology, University of Utah, Salt Lake City, UT, 84112-0110, USA Universidad Nacional Autonoma de Mexico, Mexico City, Mexico Received: 21 December 2006 – Accepted: 16 January 2007 – Published: 26 January 2007 Correspondence to: T. Garret...
متن کاملNeutron Capture and Neutron Halos
The connection between the neutron halo observed in light neutron rich nuclei and the neutron radiative capture process is outlined. We show how nuclear structure information such as spectroscopic factors and external components of the radial wave function of loosely bound states can be derived from the neutron capture cross section. The link between the direct radiative capture and the Coulomb...
متن کاملDark Halos and Galaxy Evolution
We study the evolution of disk galaxies within the frame of the cold dark matter (CDM) cosmologies. The hydrodynamics of a centrifugally supported gaseous disk and the growth of a stellar disk is calculated in detail taking into account the energy balance of the ISM and the gravitational instabilities that concern gas and stars. The halo density profile is derived from the primordial cosmologic...
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ژورنال
عنوان ژورنال: Nature
سال: 1890
ISSN: 0028-0836,1476-4687
DOI: 10.1038/041560b0