منابع مشابه
HI absorption in a gravitational lens at z ∼ 0 . 7645
We have used the Westerbork Synthesis Radio Telescope to detect HI 21cm absorption at z ∼ 0.7645 in the gravitational lens system towards PMN J0134−0931. The 21cm profile has two broad components, with peak optical depths of 0.047 ± 0.007 and 0.039 ± 0.007, at heliocentric redshifts 0.76470 ± 0.00006 and 0.76348 ± 0.00006, respectively. The redshift of the stronger component matches that of CaI...
متن کاملAbsorption of electromagnetic and gravitational waves by Kerr black holes
Article history: Received 29 August 2017 Accepted 17 September 2017 Available online 25 September 2017 Editor: M. Trodden We calculate the absorption cross section for planar waves incident upon Kerr black holes, and present a unified picture for scalar, electromagnetic and gravitational waves. We highlight the spin-helicity effect that arises from a coupling between the rotation of the black h...
متن کاملInterferometric Observations of Redshifted Molecular Absorption toward Gravitational Lenses
We have made radioand millimeter-wavelength interferometric observations of a variety of molecular absorption lines toward the gravitational lens systems B0218+357 and PKS 1830−211. The absorption occurs in the lensing galaxies at redshifts of 0.685 and 0.89, respectively. The high spatial resolution of our VLA and VLBA observations allows imaging of the background continuum emission and the ab...
متن کاملQ. Majorana’s Experiments on Gravitational Absorption: Further Documents and Manuscripts
Our intention is to present Q. Majorana (1871–1957) further documents, experimental manuscripts and results on the hypothetical physical effect of gravitational absorption. Majorana carried out his experiments thanks to two main apparata, the first at the Polytechnic of Turin (1918-1919; 1919-1921), the second at the Institute of Physics of Bologna University (1922-1924). A comparison of the re...
متن کاملNew Constraints on Quasar Broad Absorption and Emission Line Regions from Gravitational Microlensing
Gravitational microlensing is a powerful tool allowing one to probe the structure of quasars on sub-parsec scale. We report recent results, focusing on the broad absorption and emission line regions. In particular microlensing reveals the intrinsic absorption hidden in the P Cygni-type line profiles observed in the broad absorption line quasar H1413+117, as well as the existence of an extended ...
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ژورنال
عنوان ژورنال: Science
سال: 1922
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.55.1422.349