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Multivariate Approaches to Classification in Extragalactic Astronomy [PDF]
Frontiers in Astronomy and Space Sciences, 2015 Clustering objects into synthetic groups is a natural activity of any science. Astrophysics is not an exception and is now facing a deluge of data. For galaxies, the one-century old Hubble classification and the Hubble tuning fork are still largely in ...
Didier eFraix-Burnet +3 more
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The Long-Term Future of Extragalactic Astronomy [PDF]
Physical Review D, 2001 If the current energy density of the universe is indeed dominated by a cosmological constant, then high-redshift sources will remain visible to us only until they reach some finite age in their rest-frame. The radiation emitted beyond that age will never
A. Riess +22 more
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Extragalactic Astronomy and IUE [PDF]
Highlights of Astronomy, 1980 The first thing to say is that IUE has been a great success and we should all congratulate the agencies in the U.S.A., Europe and the U.K. and the many scientists and engineers involved in the project on making it possible. In surveying what has been achieved so far, it is important to remember that we may well have IUE with us for a further 3 or even ...
M. S. Longair
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Astronomy with energy dependent flavour ratios of extragalactic neutrinos [PDF]
Journal of High Energy Physics, 2021 High energy astrophysical neutrinos interacting with ultralight dark matter (DM) can undergo flavour oscillations that induce an energy dependence in the flavour ratios.
Siddhartha Karmakar +2 more
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Extragalactic Astronomy at Arcetri
Il Colle di Galileo, 2023 Extragalactic science was introduced at the Arcetri Observatory towards the end of the 1970’s, upon the arrival of a new director, Franco Pacini. The first dedicated line of research emerged in collaboration with Cornell University and the study of neutral hydrogen.
Filippo Mannucci +2 more
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Extragalactic Stellar Astronomy with Blue Supergiants [PDF]
, 2007 2 pages. To appear in the proceedings of the workshop "Massive Stars: Fundamental Parameters and Circumstellar Interactions", Rev. Mex. Astron. Astrofis.
Przybilla, N. +5 more
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Proton and neutrino extragalactic astronomy [PDF]
Physical Review D, 2008 The study of extragalactic sources of high energy radiation via the direct measurement of the proton and neutrino fluxes that they are likely to emit is one of the main goals for the future observations of the recently developed air showers detectors and neutrino telescopes. In this work we discuss the relation between the inclusive proton and neutrino
P. Lipari
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Observational Problems in Extragalactic Astronomy [PDF]
Highlights of Astronomy, 1992 AbstractA large number of observations have accumulated which represent baffling mysteries from the standpoint of current astronomy. A sample of the most crucial of these cases is reviewed and updated. Evidence has slowly built up to the point where often each individual object is a formidable challenge to conventional theory. But, most importantly, it
Halton Arp
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ON THE PROGRAM AND PRELIMINARY RESULTS OF INVESTIGATIONS OF INTRADAY AND INTERDIURNAL FLUX VARIABILITY OF EXTRAGALACTIC RADIO SOURCES AT TELESCOPES OF VENTSPILS INTERNATIONAL RADIO ASTRONOMY CENTER (VIRAC) [PDF]
Radio Physics and Radio Astronomy, 2017 Purpose: From April 2017, a monitoring program of observations has been started at the RT-16 telescope of Ventspils Radio Astronomy Center (frequencies 5, 6.1, 6.7, 8.4 GHz) to study the intraday and interdiurnal variability of extragalactic radio ...
A. L. Sukharev +4 more
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Symmetries in Stellar, Galactic and Extragalactic Astronomy [PDF]
, 2022 Examples are presented for appearance of geometric symmetry in the shape of various astronomical objects and phenomena. Usage of these symmetries in astrophysical and extragalactic research is also discussed.
L. Szabados
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