Results 21 to 30 of about 36,135 (283)

Time resolution of cosmic noise observations with acorrelation experiment [PDF]

Annales Geophysicae, 2004
A radio wave correlation experiment using a Mills Cross technique can be used to observe the cosmic noise intensity from the ground for the purpose of determining the absorption in the ionosphere.
E. Nielsen, F. Honary, M. Grill
doaj   +1 more source

Japanese VLBI Network observations of radio-loud narrow-line Seyfert 1 galaxies [PDF]

, 2007
We performed phase-reference very long baseline interferometry (VLBI) observations on five radio-loud narrow-line Seyfert 1 galaxies (NLS1s) at 8.4 GHz with the Japanese VLBI Network (JVN).
Doi, Akihiro, Fujisawa, Kenta, Habe, Asao, Harada, Keiichiro, Honma, Mareki, Inoue, Makoto, Kawaguchi, Noriyuki, Kawai, Eiji, Kobayashi, Hideyuki, Koyama, Yasuhiro, Kuboki, Hiromitsu, Murata, Yasuhiro, Nagai, Hiroshi, Omodaka, Toshihiro, Sorai, Kazuo, Sudou, Hiroshi, Suematsu, Kousuke, Takaba, Hiroshi, Takashima, Kazuhiro, Takeda, Koji, Tamura, Sayaka, Wajima, Kiyoaki, Wakamatsu, Ken-ichi   +22 more
core   +2 more sources

Characterizing Pulsars Detected in the Rapid ASKAP Continuum Survey

The Astrophysical Journal, 2023
We present the detection of 661 known pulsars observed with the Australian SKA Pathfinder (ASKAP) telescope at 888 MHz as part of the Rapid ASKAP Continuum Survey (RACS).
Akash Anumarlapudi, Anna Ehlke, Megan L. Jones, David L. Kaplan, Dougal Dobie, Emil Lenc, James K. Leung, Tara Murphy, Joshua Pritchard, Adam J. Stewart, Rahul Sengar, Craig Anderson, Julie Banfield, George Heald, Aidan W. Hotan, David McConnell, Vanessa A. Moss, Wasim Raja, Matthew T. Whiting   +18 more
doaj   +1 more source

Testing of the transionospheric radiochannel using data from the global GPS network

Annals of Geophysics, 2003
Using the international ground-based network of two-frequency receivers of the GPS navigation system provides a means of carrying out a global, continuous and fully-computerized monitoring of phase fluctuations of signals from satellite-borne ...
V. A. Karachenschev, E. L. Afraimovich
doaj   +1 more source

Deep Synoptic Array Science: Discovery of the Host Galaxy of FRB 20220912A

The Astrophysical Journal Letters, 2023
We report the detection and interferometric localization of the repeating fast radio burst (FRB) source FRB 20220912A during commissioning observations with the Deep Synoptic Array (DSA-110).
Vikram Ravi, Morgan Catha, Ge Chen, Liam Connor, Jakob T. Faber, James W. Lamb, Gregg Hallinan, Charlie Harnach, Greg Hellbourg, Rick Hobbs, David Hodge, Mark Hodges, Casey Law, Paul Rasmussen, Kritti Sharma, Myles B. Sherman, Jun Shi, Dana Simard, Reynier Squillace, Sander Weinreb, David P. Woody, Nitika Yadlapalli, The Deep Synoptic Array team, Tomas Ahumada, Dillon Dong, Christoffer Fremling, Yuping Huang, Viraj Karambelkar, Jessie M. Miller   +28 more
doaj   +1 more source

Efficient wide-field radio interferometry response [PDF]

Astronomy & Astrophysics, 2021
Radio interferometers do not measure the sky brightness distribution directly, but measure a modified Fourier transform of it. Imaging algorithms therefore need a computational representation of the linear measurement operator and its adjoint, regardless of the specific chosen imaging algorithm.
Philipp Arras, Martin Reinecke, Rüdiger Westermann, Torsten A. Enßlin   +3 more
openaire   +3 more sources

Interferometry and the study of protoplanetary disks*

EPJ Web of Conferences, 2015
Interferometry offers access to scales that are unresolvable using single dish telescopes, which is especially important when investigating objects with small angular sizes, such as protoplanetary disks.
Ilee John D., Greaves Jane S.
doaj   +1 more source

Pilot Study and Early Results of the Cosmic Filaments and Magnetism Survey with Nenufar: The Coma Cluster Field

Galaxies, 2021
NenuFAR, the New Extension in Nancay Upgrading LOFAR, is currently in its early science phase. It is in this context that the Cosmic Filaments and Magnetism Pilot Survey is observing sources with the array as it is still under construction—with 57 (56 ...
Etienne Bonnassieux, Evangelia Tremou, Julien N. Girard, Alan Loh, Valentina Vacca, Stéphane Corbel, Baptiste Cecconi, Jean-Mathias Grießmeier, Léon V. E. Koopmans, Michel Tagger, Gilles Theureau, Philippe Zarka   +11 more
doaj   +1 more source

Multi-frequency image reconstruction for radio-interferometry with self-tuned regularization parameters

, 2017
As the world's largest radio telescope, the Square Kilometer Array (SKA) will provide radio interferometric data with unprecedented detail. Image reconstruction algorithms for radio interferometry are challenged to scale well with TeraByte image sizes ...
carrillo, dewdney, hogbom, morozov, offringa, onose, onose, thompson, v?   +8 more
core   +2 more sources

Inherent and Local Magnetic Field Structures in Jets from Active Galactic Nuclei

Galaxies, 2021
In theoretical models for the electromagnetic launching of astrophysical jets, a helical magnetic (B)-field component is generated through the winding up of an initial longitudinal field component by the rotation of the cental black hole and accretion ...
Denise C. Gabuzda
doaj   +1 more source