Results 51 to 60 of about 138,479 (95)
An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
, 2015 So far, roughly 40 quasars with redshifts greater than z=6 have been discovered. Each quasar contains a black hole with a mass of about one billion solar masses ($10^9 M_\odot$). The existence of such black holes when the Universe was less than 1 billion
Beletsky, Yuri +12 more
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The Development of a Segmented N-Type Germanium Detector, and Its Application to Astronomical Gamma-Ray Spectroscopy [PDF]
, 1984 N. Gehrels +7 more
openalex +1 more source
Submillimeter-wave spectroscopy and the radio-astronomical investigation of propynethial (HC≡CCHS) [PDF]
, 2020 L. Margulès +7 more
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Current and future capabilities of the 74-inch telescope of Kottamia astronomical observatory in Egypt [PDF]
NRIAG Journal of Astronomy and Astrophysics, Special Issue, PP.
271-285, (2008) - Egypt, 2014 In this paper, we are going to introduce the Kottamia Astronomical Observatory, KAO, to the astronomical community. The current status of the telescope together with the available instrumentations is described. An upgrade stage including a new optical system and a computer controlling of both the telescope and dome are achieved. The specifications of a
arxiv
, 2008 The mid-infrared spectra of large PAHs ranging from C54H18 to C130H28 are determined computationally using Density Functional Theory. Trends in the band positions and intensities as a function of PAH size, charge and geometry are discussed. Regarding the
Charles W. Bauschlicher, Jr. +3 more
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The Pinhole/Occulter as a tool for X-ray astronomy [PDF]
The two X-ray transform telescopes on the Pinhole/Occulter Facility (P/OF) will provide sub-arcsecond angular resolution, high sensitivity imaging in hard X-rays for the first time, as well as improved capabilities for timing studies and spectroscopy ...
Wood, K. S.
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DOPPLER AND SUB-DOPPLER MILLIMETER AND SUB-MILLIMETER WAVE SPECTROSCOPY OF KEY ASTRONOMICAL MOLECULES: HNC AND CS [PDF]
, 2015 Sven Thorwirth +4 more
openalex +1 more source
Stellar synthetic spectroscopy in the Virtual Observatory era [PDF]
Astronomical Spectroscopy and Virtual Observatory, Proceedings of
the EURO-VO Workshop, Eds.: M. Guainazzi and P. Osuna, Published by the
European Space Agency., 2008, p.169, 2010 Arguments for including in the VO large grids of synthetic spectra fully covering the HR diagram are presented. One obvious need is that of population synthesis at all redshifts. Theoretical spectra have also the power to predict peculiar behaviors, that could remain unnoticed in observed spectra, or lead to erroneous conclusions.
arxiv
Use of optical fibers in spectrophotometry [PDF]
The use of single or small numbers of fiber optic fibers in astronomical spectroscopy with the goal of greater spectrophotometric and radial velocity accuracy is discussed.
Ramsey, Lawrence W.
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