Results 51 to 60 of about 37,734 (223)

A Formation Mechanism for “Wrong Way” Radio Relics

The Astrophysical Journal Letters, 2023
Radio relics are typically found to be arc-like regions of synchrotron emission in the outskirts of merging galaxy clusters, bowing out from the cluster center.
Ludwig M. Böss, Ulrich P. Steinwandel, Klaus Dolag   +2 more
doaj   +1 more source

The contribution of the Unresolved Extragalactic Radio Sources to the Brightness Temperature of the sky

, 2008
The contribution of the Unresolved Extragalactic Radio Sources to the diffuse brightness of the sky was evaluated using the source number - flux measurements available in literature.
A. Tartari, Baldwin J. E., Bennett C. L., Birkinshaw M., Burigana C., Colla G., Davis M. M., Fomalont E. B., G. Boella, G. Sironi, Gower I. F. R., Grueff G., Gruppioni C., Hales S. E. G., Katgert J. K., Katgert P., Katgert P., Katgert P., Katgert P., Katgert-Merkelijn J. K., Longair M. S., M. Gervasi, M. Zannoni, Machalski J., McGilchrist M. M., Mills B. Y., Pauliny-Toth I. I. K., Peacock J. A., Peacock J. A., Pearson T. J., Seielstad G. A., Shaver P. A., Vallee J. P., Wall J. V., Wall J. V., Wall J. V., Wilson A. S.   +36 more
core   +1 more source

The Fanaroff-Riley Transition and the Optical Luminosity of the Host Elliptical Galaxy [PDF]

, 2001
We show that a model for radio source dynamics we had earlier proposed can readily reproduce the relationship between the radio power division separating the two Fanaroff-Riley classes of extragalactic radio sources and the optical luminosity of the host
Gopal-Krishna, Wiita, Paul J.
core   +2 more sources

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí, Pedro L. Luque‐Escamilla, Benito Marcote, Daniel del Ser, Gustavo E. Romero, Cintia S. Peri   +5 more
wiley   +1 more source

DYNAMIC CHARACTERISTICS OF THE MAIN INDEXES OF SPACE WEATHER AND THEIR APPLICATION TO THE ANALYSIS MONITORING OBSERVATIONS FLUX DENSITIES OF POWER RADIO SOURCES ON RT <URAN-4>

Odessa Astronomical Publications, 2012
On radio telescope "URAN-4" of the Odessa observatory of Radio-astronomical Institute during twenty five years (since 1987 till present) monitoring of power galactic and extragalactic radio sources on frequencies 25 and 20MHz has been carried out.
L. Guglya, M. Ryabov, S. Panishko, A. Suharev   +3 more
doaj   +1 more source

Phaseless VLBI mapping of compact extragalactic radio sources

, 2004
The problem of phaseless aperture synthesis is of current interest in phase-unstable VLBI with a small number of elements when either the use of closure phases is not possible (a two-element interferometer) or their quality and number are not enough for ...
A. R. Thompson, A. T. Bajkova, A. T. Bajkova, A. T. Bajkova, A. T. Bajkova, A. T. Bajkova, A. T. Bajkova, A. T. Bajkova, A. V. Oppenheim, J. E. Baldwin, J. E. Baldwin, J. L. C. Sanz, J. R. Fienup, J. R. Fienup, J. R. Fienup, M. H. Hayes, R. Gerchberg, T. B. Pyatunina, Ya. I. Khurgin, Yu. M. Bruck   +19 more
core   +2 more sources

Effects of Forbush Decreases on the Global Electric Circuit

Space Weather, Volume 22, Issue 4, April 2024.
Abstract The suppression of high‐energy cosmic rays, known as Forbush decreases (FDs), represents a promising factor in influencing the global electric circuit (GEC) system. Researchers have delved into these effects by examining variations, often disruptive, of the potential gradient (PG) in ground‐based measurements taken in fair weather regions.
J. Tacza, G. Li, J.‐P. Raulin
wiley   +1 more source

Galactic HCO+ Absorption toward Compact Extragalactic Radio Sources

, 2018
As part of the search for the "dark molecular gas (DMG)," we report on the results of HCO$^+$ J = 1-0 absorption observations toward nine bright extragalactic millimeter wave continuum sources. The extragalactic sources are at high Galactic latitudes (|b|
Byun, Do-Young, Heiles, Carl E., Kim, Kee-Tae, Koo, Bon-Chul, Park, Geumsook   +4 more
core   +1 more source

The Cosmic Evolution of Fast Radio Bursts Inferred from the CHIME/FRB Baseband Catalog 1

The Astrophysical Journal
Redshift and luminosity distributions are essential for understanding the cosmic evolution of extragalactic objects and phenomena, such as galaxies, gamma-ray bursts, and fast radio bursts (FRBs).
Om Gupta, Paz Beniamini, Pawan Kumar, Steven L. Finkelstein   +3 more
doaj   +1 more source

A sharper view of the outer Galaxy at 1420 and 408 MHz from the Canadian Galactic Plane Survey - I. Revisiting the KR catalogue and new Gigahertz Peaked Spectrum Sources

, 2007
Arcminute-resolution radio continuum images at 408 and 1420 MHz from the Canadian Galactic Plane Survey (CGPS) have been used to reexamine radio sources listed in the Kallas and Reich (1980) catalogue. This catalogue is of particular interest to Galactic
Brand, C. R. Kerton, Cao, Condon, De Vries, Fich, Foster, Higgs, Kallas, Kerton, Landecker, Marecki, Masetti, O'Dea, Ortega, Reich, Röttgering, Taylor, Trushkin, Vollmer   +19 more
core   +1 more source