Results 51 to 60 of about 4,016,739 (216)

HEAD IN THE STARS, FEET ON THE GROUND: Scale and Astronomy Initiatives in Southern Africa

Cultural Anthropology, Volume 40, Issue 4, Page 571-596, November 2025.
ABSTRACT This article explores the evolution of radio astronomy in South Africa and Madagascar, focusing on how “scale” functions as both a way of understanding the world and marking differences in existence. In outer space research, the ground is crucial but often overlooked.
HANNA NIEBER, DAVIDE CHINIGÒ
wiley   +1 more source

An Extragalactic Widefield Search for Technosignatures with the Murchison Widefield Array

The Astrophysical Journal
It is common for surveys that are designed to find artificial signals generated by distant civilizations to focus on galactic sources. Recently, researchers have started focusing on searching for all other sources within the field observed, including the
C. D. Tremblay, S. J. Tingay
doaj   +1 more source

An Updated Repository of Sub-mJy Extragalactic Source-Count Measurements in the Radio Domain

Galaxies
We present an updated repository of sub-mJy extragalactic radio source counts between 150 MHz and 10 GHz, incorporating recent advances in radio surveys and observational techniques. By compiling and refining previous datasets, we provide a comprehensive
Vincenzo Galluzzi, Meriem Behiri, Marika Giulietti, Andrea Lapi   +3 more
doaj   +1 more source

Counts of Extragalactic Radio Sources [PDF]

Australian Journal of Physics, 1961
In this paper a formula is derived giving the cumulative totals of class II radio sources, to successive limits of flux density, when changes in the space· density and in the radiative properties of these sources are taken into account.
openaire   +1 more source

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Ultracompact extragalactic radio sources at 86GHz

, 2019
VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Global millimeter VLBI array survey of ultracompact extragalactic radio sources at 86 GHz.' (bibcode: 2019A&A...622A ...
Ros, Eduardo, Krichbaum, Thomas P., Lindqvist, Michael, Moscow Institute of Physics and Technology, Zensus, Johann Anton, Hagiwara, Yoshiaki, Korea Astronomy and Space Science Institute, Lee, Sang-Sung, Toyo University, Max-Planck-Institut Für Radioastronomie, Nair, Dhanya G., Kovalev, Yuri Y., Department of Space, Earth and Environment, Onsala Space Observatory, Sverige, Mertens, Florent, De Vicente, Pablo, Institut de Radio Astronomie Millimétrique (IRAM), Institut für Experimentalphysik, Universität Hamburg, Lobanov, Andrei P., Bremer, Michael, University of Hamburg, Observatorio Astronómico Nacional, Observatorio de Yebes, Astro Space Center of Lebedev Physical Institute, Max Planck Institut für Astronomie, Astronomy   +23 more
core   +1 more source

VLBI observations of 21 extragalactic radio sources

, 1999
We present the results of VLBI observations of 21 extragalactic radio sources carried out with an ad-hoc VLBI array including Shanghai, Urumqi, Noto, and Hartebeesthoek radio telescopes. Eleven sources are imaged, three of them for the first time with
D. R. Jiang, G. Nicolson, T. Venturi, T. S. Wan, Z.-Q. Shen, X. Liu, X. Y. Hong, G. Umana   +7 more
core   +2 more sources

Isolated Neutron Stars as Science Validation for XMM2ATHENA: Ensuring Robust Data for Future X‐Ray Astronomy

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the availability of deep, wide‐area optical surveys now enable us to explore XINSs at fainter x‐ray fluxes and ...
Adriana Mancini Pires, Christian Motch, Axel Schwope, Iris Traulsen, Jean Ballet, Sudip Chakraborty, David Homan, Jan Kurpas, Ada Nebot Gomez‐Moràn, François‐Xavier Pineau, Hugo Tranin, Natalie Webb   +11 more
wiley   +1 more source

Studies of Compact Extragalactic Radio Sources [PDF]

, 1981
Three studies of compact, extragalactic radio sources are presented. In the first, VLBI maps are presented of the nuclear cores of four radio galaxies which have large symmetric radio lobes: 3C 111, 3C 390.3, Cyg A, and 0055+30. Each source contains a
Linfield, Roger Paul
core   +1 more source

SOURCES WITH LOW-FREQUENCY STEEPNESS SPECTRUM CONCERNING THE UNIFIED MODEL

Odessa Astronomical Publications, 2012
Based on data of the data of the Grakovo catalogue of the extragalactic sources, detected at the decametre band with the UTR-2 radio telescope , it was established, that properties of radio sources with lowfrequency steepness of spectrum are in ...
A. P. Miroshnichenko
doaj   +1 more source