Results 191 to 200 of about 53,924 (236)

Oort and Extragalactic Astronomy

1980
Our understanding of the nature of external galaxies, incomplete as it still is, has depended cast essentially on the understanding of our own Milky Way. And one cannot think of any facet of knowledge about our Galaxy without paying tribute to Jan Oort’s elucidation of its mysteries.
Margaret Burbidge, Geoffrey Burbidge
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Extragalactic Astronomy with 2MASS

1998
Observations for the Two-Micron All Sky Survey (2MASS) have recently begun at the northern hemisphere site. The project is now in the final phases of tuning the data analysis software in preparation for running the “pipeline” at full bore. The path to completing the extragalactic portion of the pipeline, called GALWORKS, was complicated. It required an
S. E. Schneider, J. L. Rosenberg, T. H. Jarrett, T. J. Chester, J. P. Huchra   +4 more
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Extragalactic Soft X-ray Astronomy

Nature, 1968
The opacity of the galaxy to soft X-rays may be less than previously supposed. This may permit a variety of extragalactic objects to be observed at ∼50 A. Some implications of this situation are discussed here.
M. J. REES, D. W. SCIAMA, G. SETTI
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Extragalactic X-Ray Astronomy

Physica Scripta, 1984
I briefly comment the ten poster papers in the area of clusters of galaxies and active galactic nuclei. These papers are all published in these proceedings as well.
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Extragalactic astronomy with the OHANA array

SPIE Proceedings, 2003
The Optical Hawaiian Array for Nanoradian Astronomy (OHANA) will allow resolutions on the order of a fraction of a milliarcsecond in the near infrared. This corresponds to the suspected size of the Broad Line Region and might even allow to study the structure of the base of jets.
Woillez, Julien M., Sol, Hélène, Lai, Olivier, Guyon, Olivier, Perrin, Guy   +4 more
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Extragalactic astronomy. Book 2. Galaxies: multiwavelength properties

2023
This textbook follows the «Extragalactic Astronomy. Book 1. Galaxies: basic physical properties». Book 2 describes methods and instrumental means for obtaining and processing data on physical properties of galaxies in various spectral ranges. Attention is paid to galaxies with excess radiation in the IR, radio, UV, and X- bands, to the dwarf galaxies ...
Iryna Vavilova, Yuri Kudrya, Anatoliy Vasylenko, Iurii Babyk   +3 more
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Using SNAP for Galactic & extragalactic astronomy

Astrophysics and Space Science, 2007
SNAP, the SuperNova Acceleration Probe, is planned as a space-based telescope designed specifically to search for and monitor cosmological supernovae and weak lensing. In this paper we propose some other mission objectives which are of great importance in the fields of Galactic and extragalactic astronomy and which can be done as by-products with the ...
Olga K. Sil’chenko, Alexei S. Rastorguev, Nikolai G. Bochkarev   +2 more
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HyperLeda: Virtual Instruments for Extragalactic Astronomy

2006
HyperLeda offers a series of tools of interest for Galactic and extra-galactic astronomy. The most prominent service is the LEDA catalogue which presents 70 homogenized parameters collected for over 3 million galaxies.
Prugniel, Philippe, Paturel, Georges, Georgiev, Vladimir, Chilingarian, Igor V., Petit, Chantal   +4 more
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Recent Results in Astronomy I: Extragalactic

1989
One of the main aims of the extragalactic radioastronomy is to understand the physical phenomenon ”radiosource”, produced by high energy processes which take place mainly in the centres of galaxies and quasars. Typical radio structures of powerful radiosources lead to the acceptance of the idea of ordered collimated outflowing of matter from nuclei to ...
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TeV Gamma-Ray Astronomy, Extragalactic Sources

1995
With the detection of Markarian 421 at TeV energies, it is clear that AGN’s are serious candidates for study with ground-based TeV telescopes. The explanation of the TeV emission is a major constraint on source models. The exact point of the cut-off in the observed spectrum has implications for cosmology.
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