Results 11 to 20 of about 1,065 (171)
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 Fraix-Burnet, Marc Thuillard
exaly +6 more sources
Towards a sustainable astronomical data infrastructure: Optimising linking data from the Rucio datalake to the users areas within the SKA Regional Centres Network [version 2; peer review: 1 approved, 2 approved with reservations] [PDF]
Open Research EuropeThe distributed architecture of the SKA Regional Centre Network (SRCNet) aims to provide scientific communities worldwide with efficient computational and storage resources to exploit the massive data volumes produced by the SKA Observatory (SKAO). Given
Sean McConkey +11 more
doaj +2 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.
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 ...
Ray Norris, Norris Ray P
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
Walter Gear +2 more
exaly +4 more sources
How Are Red and Blue Quasars Different? The Radio Properties
Galaxies, 2021 A non-negligible fraction of quasars are red at optical wavelengths, indicating (in the majority of cases) that the accretion disc is obscured by a column of dust which extinguishes the shorter-wavelength blue emission. In this paper, we summarize recent
Victoria A. Fawcett +3 more
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Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe
The Astrophysical Journal Letters, 2023 Based on a new H i survey using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with the Pan-STARRS1 images, we identified an isolated H i cloud without any optical counterpart, named FAST J0139+4328.
Jin-Long Xu +6 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
openaire +1 more source
The Event Horizon Telescope Image of the Quasar NRAO 530
The Astrophysical Journal, 2023 We report on the observations of the quasar NRAO 530 with the Event Horizon Telescope (EHT) on 2017 April 5−7, when NRAO 530 was used as a calibrator for the EHT observations of Sagittarius A*.
Svetlana Jorstad +269 more
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The Astronomical Journal, 2023 We extend the analysis presented by Contini et al. to higher redshifts, up to z = 2, by focusing on the relation between the intracluster light (ICL) fraction and the halo mass, its dependence on redshift, the role played by the halo concentration, and ...
Emanuele Contini +4 more
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