Results 1 to 10 of about 53,536 (153)

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 ...
Chattopadhyay, Asis Kumar, Fraix-Burnet, Didier, Thuillard, Marc   +2 more
core   +7 more sources

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, A.A. Starobinsky, Abraham Loeb, B. Ratra, D. Edwards, D. Edwards, E. Harrison, F.C. Adams, G. Starkman, G.F. Ellis, J.D. Barrow, L.M. Krauss, M.P. Dabrowaki, M.P. Dabrowaki, P. de Bernardis, P.M. Garnavich, R.R. Caldwell, S. Hanany, S. Perlmutter, S. Weinberg, T. Rothman, U. Pen, W. Rindler   +22 more
core   +7 more sources

Extragalactic Stellar Astronomy [PDF]

Thirty Years of Astronomical Discovery With UKIRT, 2008
Despite their paucity, massive hot stars are real cosmic engines of fundamental importance in shaping our Universe, from its very early stages up to its current appearance. Understanding the physics of massive stars is then a key issue for many relevant astrophysical phenomena.
Miguel A Urbaneja, Rolf-Peter Kudritzki, Fabio Bresolin   +2 more
exaly   +3 more sources

Extragalactic radio continuum surveys and the transformation of radio astronomy [PDF]

Nature Astronomy, 2017
Next-generation radio surveys are about to transform radio astronomy by discovering and studying tens of millions of previously unknown radio sources. These surveys will provide new insights to understand the evolution of galaxies, measuring the evolution of the cosmic star formation rate, and rivalling traditional techniques in the measurement of ...
R P Norris
exaly   +4 more sources

The Herschel–SPIRE instrument and its capabilities for extragalactic astronomy

Advances in Space Research, 2007
SPIRE, the Spectral and Photometric Imaging Receiver, is one of three instruments to fly on the European Space Agency’s Herschel Space Observatory. It contains a three-band imaging photometer operating at 250, 350 and 500 μm, and an imaging Fourier transform spectrometer covering 194–672 μm. The SPIRE detectors are arrays of feedhorn-coupled bolometers
Matthew Griffin, Jean-Paul Baluteau, James Böck   +2 more
exaly   +4 more sources

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, Leslie K. Hunt, Roberto Maiolino   +2 more
openaire   +1 more source

New distance measures for classifying X-ray astronomy data into stellar classes [PDF]

, 2018
The classification of the X-ray sources into classes (such as extragalactic sources, background stars, ...) is an essential task in astronomy. Typically, one of the classes corresponds to extragalactic radiation, whose photon emission behaviour is well ...
A Araujo, A Baíllo, Amparo Baíllo, AW van der Vaart, AW van der Vaart, B Efron, E del Barrio, ED Feigelson, ED Feigelson, J Cárcamo, Javier Cárcamo, K Getman, K Getman, Konstantin Getman, KV Getman, KV Getman, L Grafakos, L Scrucca, LA García-Escudero, M Hubert, M Kuhn, M Ledoux, M Shaked, N Henze, NS Schulz, O Kallenberg, PS Broos, S Ascher, SJ Wolk, ST Rachev, ST Rachev, WN Venables   +31 more
core   +1 more source

Status of the VERITAS Observatory [PDF]

, 2008
VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes.
A. Cannon, A. Cesarini, A. D. Falcone, A. Furniss, A. Imran, A. Konopelko, A. McCann, A. W. Smith, A. Weinstein, B. Zitzer, C. M. Hui, D. A. Williams, D. B. Kieda, D. Hanna, D. Horan, D. Pandel, D. Steele, E. Aliu, E. Hays, F. Krennrich, Felix A. Aharonian, Frank Rieger, G. Finnegan, G. Gyuk, G. H. Gillanders, G. H. Sembroski, G. Maier, H. J. Rose, H. Krawczynski, J. A. Toner, J. E. Ward, J. Grube, J. H. Buckley, J. Holder, J. Kildea, J. Niemiec, J. P. Finley, J. Quinn, J. S. Perkins, K. L. Byrum, K. Ragan, L. C. Reyes, L. Ciupik, L. F. Fortson, L. Valcarcel, M. Beilicke, M. J. Lang, M. K. Daniel, M. Kertzman, M. McCutcheon, M. Pohl, M. Schroedter, M. Wood, N. Karlsson, O. Celik, P. Cogan, P. Colin, P. Fortin, P. Kaaret, P. Moriarty, P. T. Reynolds, R. A. Ong, R. Guenette, R. J. White, R. Mukherjee, R. Wagner, S. A. Wissel, S. J. Fegan, S. LeBohec, S. M. Bradbury, S. P. Swordy, S. P. Wakely, T. Arlen, T. B. Humensky, T. C. Weekes, T. Ergin, T. Nagai, V. A. Acciari, V. Bugaev, V. V. Vassiliev, W. Benbow, W. Cui, Werner Hofmann, Y. Butt, Y. C. K. Chow   +84 more
core   +3 more sources

Symmetries in Stellar, Galactic, and Extragalactic Astronomy [PDF]

, 2021
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.
openaire   +2 more sources

Extragalactic Astronomy with the VLTI: a new window on the Universe [PDF]

Astrophysics and Space Science, 2003
Interferometry in the optical and near infrared has so far played a marginal role in Extragalactic Astronomy. Active Galactic Nuclei are the brightest and most compact extragalactic sources, nonetheless only a very limited number could be studied with speckle interferometry and none with long baseline interferometry.
MARCONI, ALESSANDRO, R. Maiolino, R. G. Petrov   +2 more
openaire   +3 more sources