Results 71 to 80 of about 180,573 (206)

The Study of Radio Flux Density Variations of the Quasar OJ 287 by the Wavelet and the Singular Spectrum Methods

Open Astronomy, 2016
Flux density variations of the extragalactic radio source OJ 287 are studied by applying the wavelet and the singular spectrum methods to the long-term monitoring data at 14.5, 8.0 and 4.8 GHz acquired at the University of Michigan Radio Astronomy ...
Donskykh Ganna
doaj   +1 more source

Hypercat : A Database for extragalactic astronomy

, 1999
The Hypercat Database is developed at Observatoire de Lyon and is distributed on the WEB through different mirrors in Europe. The goal of Hypercat is to gather data necessary for studying the evolution of galaxies (dynamics and stellar contains) and particularly for providing a z=0 reference for these studies.
Prugniel, Ph., Maubon, G.
openaire   +2 more sources

EIGER. VIII. First Stars Signatures in the Connection between O I Absorption and Galaxies in the Epoch of Reionization

The Astrophysical Journal
We investigate the association between galaxies and neutral O i absorption systems at z  ∼ 6, which trace metal-enriched gas during the epoch of reionization.
Jack Higginson, Rongmon Bordoloi, Robert A. Simcoe, Jorryt Matthee, Daichi Kashino, Ruari Mackenzie, Ivan Kramarenko, Simon J. Lilly, Anna-Christina Eilers, Rohan P. Naidu, Minghao Yue   +10 more
doaj   +1 more source

Astronomy & Astrophysics (CAUCASUS)-VOLUME 1

, 2016
                                                                        ...
(CAUCASUS), Astronomy & Astrophysics
core   +1 more source

Physics from Time Variability of the VHE Blazar PKS 2155-304 [PDF]

, 2010
Blazars are the principal extragalactic sources of very high energy gamma-ray emission in the Universe. These objects constitute a sub-class of Active Galactic Nuclei whose emission is dominated by Doppler boosted non-thermal radiation from plasma ...
BARRES-DE-ALMEIDA, ULISSES
core  

Extragalactic fast X-ray transient cand.

, 2023
VizieR online Data Catalogue associated with article published in journal Astronomy and Astrophysics with title ' Extragalactic fast X-ray transient candidates discovered by Chandra (2014-2022).' (bibcode: 2023A&A...675A ...
Camacho, E., Leiden University, Space Science Institute, Zheng, X.C., Millennium Institute of Astrophysics, Eappachen, D., Xue, Y.Q., University of Warwick, Escuela Politécnica Nacional, Brandt, W.N., Levan, A.J., University of Science and Technology of China, Radboud University Nijmegen, SRON Netherlands Institute for Space Research, Pennsylvania State University, Yang, G., Pontificia Universidad Catolica de Chile, INAF-Osservatorio Astronomico di Brera, Bauer, F.E., Jonker, P.G., Quirola-Vasquez, J., Ravasio, M.E., Luo, B., Nanjing University, Astronomy   +24 more
core   +1 more source

Environments of Luminous Low-frequency Radio Galaxies Since Cosmic Noon: Jet-mode Feedback Dominates in Groups

The Astrophysical Journal
Coupling between relativistic jets launched by accreting supermassive black holes and the surrounding gaseous media is a vital ingredient in galaxy evolution models.
Grayson C. Petter, Ryan C. Hickox, Leah K. Morabito, David M. Alexander   +3 more
doaj   +1 more source

Multi-wavelength extragalactic astronomy at Ghent University

Bulletin de la Société Royale des Sciences de Liège, 2019
Galaxies are generally considered as the basic building blocks of the Universe. Besides stars, galaxies also contain a supermassive black hole, a dark matter halo, and a multi-phase interstellar medium that consists of molecules, atoms, ions, and dust grains.
Baes, Maarten, Camps, Peter, De Looze, Ilse, Viaene, Sébastien   +3 more
openaire   +2 more sources

Radial Profiles of Σ*, ΣSFR, Gas Metallicity, and Their Correlations across the Galactic Mass–Size Plane

The Astrophysical Journal
We analyzed the global and resolved properties of approximately 1240 nearby star-forming galaxies from the MaNGA survey, comparing compact and extended galaxies—those with smaller and larger radii ( R _e ), respectively—at a fixed stellar mass ( M _ ...
Lin Lin, Shiyin Shen, Hassen M. Yesuf, Ye-Wei Mao, Lei Hao   +4 more
doaj   +1 more source

Fundamental Astronomy

, 2007
Fundamental Astronomy gives a well-balanced and comprehensive introduction to the topics of classical and modern astronomy. While emphasizing both the astronomical concepts and the underlying physical principles, the text provides a sound basis for more ...
Donner, Karl Johan, Oja, Heikki, Poutanen, Markku, Kröger, Pekka, Karttunen, Hannu   +4 more
core   +1 more source