Zobrazeno 1 - 10
of 73
pro vyhledávání: '"Spencer, Ralph"'
Autor:
Yang, Jun, García, Federico, del Palacio, Santiago, Spencer, Ralph, Paragi, Zsolt, Segura, Noel Castro, Gong, Biping, Cao, Hongmin, Chen, Wen
Cygnus X-3 is a high-mass X-ray binary with a compact object accreting matter from a Wolf-Rayet donor star. Recently, it has been revealed by the Imaging X-ray Polarimetry Explorer (IXPE) as a hidden Galactic ultra-luminous X-ray (ULX) source with a
Externí odkaz:
http://arxiv.org/abs/2308.01002
The cm-wavelength radio flares on Cygnus X-3 have been studied for many years. Our recent paper (Spencer et al., 2022) looked again at the minor flares (flux density S of a few 100 mJy) and compared their properties with those of a sample of major fl
Externí odkaz:
http://arxiv.org/abs/2303.07353
Intense flares at cm-wavelengths reaching levels of tens of Jy have been observed from Cygnus X-3 for many years. This active high mass X-ray binary also has periods of quenching before major outbursts, and has minor flares at levels of a few hundred
Externí odkaz:
http://arxiv.org/abs/2203.05637
Autor:
James, Clancy W., Alvarez-Muñiz, Jaime, Bray, Justin D., Buitink, Stijn, Dagkesamanskii, Rustam D., Ekers, Ronald D., Falcke, Heino, Gayley, Ken, Huege, Tim, Mevius, Maaijke, Mutel, Rob, Scholten, Olaf, Spencer, Ralph, ter Veen, Sander, Winchen, Tobias
Publikováno v:
EPJ Web Conf., Volume 135, 04001 (2017)
The lunar technique is a method for maximising the collection area for ultra-high-energy (UHE) cosmic ray and neutrino searches. The method uses either ground-based radio telescopes or lunar orbiters to search for Askaryan emission from particles cas
Externí odkaz:
http://arxiv.org/abs/1704.05336
Autor:
James, Clancy W., Alvarez-Muniz, Jaime, Bray, Justin D., Buitink, Stijn, Dagkesamanskii, Rustam D., Ekers, Ronald D., Falcke, Heino, Gayley, Ken G., Huege, Tim, Mevius, Maaijke, Mutel, Robert L., Protheroe, Raymond J., Scholten, Olaf, Spencer, Ralph E., ter Veen, Sander
Publikováno v:
POS(ICRC2015)291
The lunar Askaryan technique is a method to study the highest-energy cosmic rays, and their predicted counterparts, the ultra-high-energy neutrinos. By observing the Moon with a radio telescope, and searching for the characteristic nanosecond-scale A
Externí odkaz:
http://arxiv.org/abs/1608.02408
Autor:
Rushton, Anthony, Miller-Jones, James, Paragi, Zsolt, Maccarone, Thomas, Pooley, Guy, Tudose, Valeriu, Fender, Rob, Spencer, Ralph, Dhawan, Vivek, Garrett, Michael
Results are presented from recent VLBI observations of Cygnus X-1 during X-ray spectral state changes. Using the EVN in e-VLBI mode and the VLBA with disk recording, we observed the X-ray binary at very high angular resolution and studied changes in
Externí odkaz:
http://arxiv.org/abs/1101.3322
Publikováno v:
Astron.Astrophys.449:985-996,2006
According to a generally accepted paradigm, small intrinsic sizes of Compact Steep Spectrum (CSS) radio sources are a direct consequence of their youth, but in later stages of their evolution they are believed to become large-scale sources. However,
Externí odkaz:
http://arxiv.org/abs/astro-ph/0512034
Publikováno v:
Astron.Astrophys. 440 (2005) 93-105
A new sample of candidate Compact Steep Spectrum (CSS) sources that are much weaker than the CSS source prototypes has been selected from the VLA FIRST catalogue. MERLIN `snapshot' observations of the sources at 5 GHz indicate that six of them have a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505435
Autor:
Fender, Rob, Wu, Kinwah, Johnston, Helen, Tzioumis, Tasso, Jonker, Peter, Spencer, Ralph, van der Klis, Michiel
Publikováno v:
Nature, 427, 222-224, 2004
Collimated relativistic outflows, or jets, are amongst the most energetic and relativistic phenomena in the Universe. They are associated with supermassive black holes in distant active galactic nuclei (AGN), accreting black holes and neutron stars i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0401290
According to the currently accepted paradigm compact steep spectrum (CSS) sources are precursors of larger/older objects and gigahertz peaked spectrum (GPS) sources may be earlier stages of CSS sources. In this paper we confront this paradigm with th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0211253