Results 41 to 50 of about 37,734 (223)

Jet Interactions with the Hot Halos of Clusters and Galaxies [PDF]

, 2007
X-ray observations of cavities and shock fronts produced by jets streaming through hot halos have significantly advanced our understanding of the energetics and dynamics of extragalactic radio sources.
Birzan, L., Carilli, C., McNamara, B. R., Nulsen, P. E. J., Rafferty, D. A., Wise, M. W.   +5 more
core   +1 more source

Radio source stacking and the infrared / radio correlation at microJy flux densities

, 2008
We investigate the infrared / radio correlation using the technique of source stacking, in order to probe the average properties of radio sources that are too faint to be detected individually.
Afonso, Appleton, Becker, Bertin, Beswick, Biggs, Boyle, Carilli, Condon, de Jong, de Vries, Fadda, Fadda, Fazio, Frayer, Garn, Garn, Garn, Garrett, Helou, Hodge, Ibar, Ivison, Lacy, Lonsdale, Murphy, Norris, Paul Alexander, Prandoni, Rowan-Robinson, Roy, Sanders, Shupe, Sopp, Timothy Garn, Wals, Werner, White, Yun, Zheng, Zheng, Zibetti   +41 more
core   +2 more sources

Deep Synoptic Array Science: Implications of Faraday Rotation Measures of Fast Radio Bursts Localized to Host Galaxies

The Astrophysical Journal Letters, 2023
Faraday rotation measures (RMs) of fast radio bursts (FRBs) offer the prospect of directly measuring extragalactic magnetic fields. We present an analysis of the RMs of 10 as yet nonrepeating FRBs detected and localized to host galaxies with robust ...
Myles B. Sherman, Liam Connor, Vikram Ravi, Casey Law, Ge Chen, Kritti Sharma, Morgan Catha, Jakob T. Faber, Gregg Hallinan, Charlie Harnach, Greg Hellbourg, Rick Hobbs, David Hodge, Mark Hodges, James W. Lamb, Paul Rasmussen, Jun Shi, Dana Simard, Jean Somalwar, Reynier Squillace, Sander Weinreb, David P. Woody, Nitika Yadlapalli, The Deep Synoptic Array Team   +23 more
doaj   +1 more source

Extragalactic Radio Sources and the WMAP Cold Spot

, 2007
We detect a dip of 20-45% in the surface brightness and number counts of NVSS sources smoothed to a few degrees at the location of the WMAP cold spot. The dip has structure on scales of approximately 1-10 degrees.
Cabre A., Haslam C. G. T., Lawrence Rudnick, Liliya R. Williams, Reich W., Shea Brown   +5 more
core   +1 more source

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
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

THE IMAGES OF EXTRAGALACTIC RADIO SOURCES IN THE DIFFUSION MODEL

Odessa Astronomical Publications, 2017
The distribution of the spectral index and radio lobes' isophots were derived by numerical methods in the diffusion model of extragalactic radio sources. The kinetic equation for the distribution function of relativistic electrons is considered.
F. M. Kolesnikov, V. M. Kontorovich
doaj   +1 more source

Clusters of Extragalactic Ultra Compact HII Regions [PDF]

, 2001
We report on the detection of optically thick free-free radio sources in the galaxies M33, NGC 253, and NGC 6946 using data in the literature. We interpret these sources as being young, embedded star birth regions, which are likely to be clusters of ...
Bianchi S., Boulesteix J., Courtes G., De Pree C. G., Duric N., Garcia-Gomez C., Henry A. Kobulnicky, Kelsey E. Johnson, Larsen S. S., Peter S. Conti, Philip Massey, Smith L. F., Tarchi A., Weiler K. W., Westerhout G.   +14 more
core   +2 more sources

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin, D. Nardiello, M. Salaris, M. Libralato, P. Bergeron, A. J. Burgasser, D. Apai, M. Griggio, M. Scalco, J. Anderson, R. Gerasimov, A. Bellini   +11 more
wiley   +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