Results 11 to 20 of about 425,495 (159)

X-ray Emitting GHz-Peaked Spectrum Galaxies: Testing a Dynamical-Radiative Model with Broad-Band Spectra [PDF]

, 2010
In a dynamical-radiative model we recently developed to describe the physics of compact, GHz-Peaked-Spectrum (GPS) sources, the relativistic jets propagate across the inner, kpc-sized region of the host galaxy, while the electron population of the ...
Begelman, M. C., Cheung, C. C., Diaferio, A., Kataoka, J., Kowalska, I., Moderski, R., Ostorero, L., Stawarz, L., Wagner, S. J.   +8 more
core   +2 more sources

Radio emission from the massive stars in the Galactic Super Star Cluster Westerlund 1 [PDF]

, 2009
Current mass-loss rate estimates imply that main sequence winds are not sufficient to strip away the H-rich envelope to yield Wolf-Rayet (WR) stars. The rich transitional population of Westerlund 1 (Wd 1) provides an ideal laboratory to observe mass-loss
Chapman, J. M., Clark, J. S., Dougherty, S. M., Johnson, T., Negueruela, I.   +4 more
core   +3 more sources

Cosmic-Ray Acceleration and Nonthermal Radiation at Accretion Shocks in the Outer Regions of Galaxy Clusters

The Astrophysical Journal, 2023
Cosmology models predict that external accretion shocks form in the outer region of galaxy clusters owing to supersonic gas infall from filaments and voids in the cosmic web. They are characterized by high sonic and Alfvénic Mach numbers, M _s ∼ 10–10 ^2
Ji-Hoon Ha, Dongsu Ryu, Hyesung Kang
doaj   +1 more source

Gamma-Rays from Intergalactic Shocks [PDF]

, 2002
Structure formation in the intergalactic medium (IGM) produces large-scale, collisionless shock waves, where electrons can accelerate to highly relativistic energies.
Hernquist, Lars, Keshet, Uri, Loeb, Abraham, Springel, Volker, Waxman, Eli   +4 more
core   +4 more sources

The evolution of the large-scale emission in FRI jets

, 2010
Recent observations in X-rays and gamma-rays of nearby FRI radio galaxies have raised the question of the origin of the emission detected in the termination structures of their jets.
Abdo, Abdo, Aharonian, Aharonian, Andernach, Bicknell, Blumenthal, Bordas, Celotti, Cheung, Croston, Croston, Drury, Falle, Fanaroff, Feigelson, Hardcastle, Harris, Heinz, Hillas, Isobe, Israel, Kaiser, Kataoka, Kataoka, Kelner, Kino, Kraft, Kraft, Laing, Leahy, M. Perucho, McNamara, O'Sullivan, P. Bordas, Perucho, Quilis, Reynolds, Rieger, Siemiginowska, V. Bosch-Ramon, Wilson, Zanni, Zanni   +43 more
core   +1 more source

A spectroscopic search for AGN activity in the reionization era [PDF]

, 2017
The ubiquity of Lyman alpha (Ly$\alpha$) emission in a sample of four bright [O III]-strong star-forming galaxies with redshifts above 7 has led to the suggestion that such luminous sources represent a distinct population compared to their fainter, more ...
Ellis, Richard S., Laporte, Nicolas, Mainali, Ramesh, Nakajima, Kimihiko, Roberts-Borsani, G., Stark, Daniel P., Zitrin, Adi   +6 more
core   +2 more sources

Identification of the infrared non-thermal emission in Blazars

, 2012
Blazars constitute the most interesting and enigmatic class of extragalactic gamma-ray sources dominated by non-thermal emission. In this Letter, we show how the WISE infrared data make possible to identify a distinct region of the [3.4]-[4.6]-[12 ...
Abdo, Blandford, Cutri, D'Abrusco, Impey, Laurino, Massaro, Massaro, Massaro, Ong, Padovani, Taylor, Wright   +12 more
core   +1 more source

Polarization Angle Orthogonal Jumps in Fast Radio Bursts

The Astrophysical Journal
Recently, polarization angle (PA) orthogonal jumps over millisecond timescales were discovered from three bursts of the repeating fast radio burst source FRB 20201124A by the FAST telescope.
Yuanhong Qu, Bing Zhang, Pawan Kumar
doaj   +1 more source

Off-axis Afterglow Closure Relations and Fermi-LAT Detected Gamma-Ray Bursts

The Astrophysical Journal, 2023
Gamma-ray bursts (GRBs) are one of the most promising transient events for studying multiwavelength observations in extreme conditions. Observation of GeV photons from bursts would provide crucial information on GRB physics, including the off-axis ...
N. Fraija, M. G. Dainotti, D. Levine, B. Betancourt Kamenetskaia, A. Galvan-Gamez   +4 more
doaj   +1 more source

Parsec-Scale Images of Flat-Spectrum Radio Sources in Seyfert Galaxies [PDF]

, 1999
We present high angular resolution (~2 mas) radio continuum observations of five Seyfert galaxies with flat-spectrum radio nuclei, using the VLBA at 8.4 GHz.
A. L. Roy, A. S. Wilson, Antonucci R. R. J., Baars J. W. M., Baker A. J., Blanco P. R., Boisson C., C. G. Mundell, Clements E. D., Clements E. D., Crusius-Waetzel A. R., de Bruyn A. G., Fernandes R. C., Jr., Fosbury R. A. E., Haehnelt M. G., Hummel E., Iwasawa K., J. S. Ulvestad, Kukula M. J., Kukula M. J., Malaguti G., Matt G., Mundell C. G., Penston M. V., Phillips M. M., Prieto M. A., Pringle J. E., Richstone D., Sadler E. M., Silk J., van Gorkom J., Wilson A. S., Wrobel J. M.   +32 more
core   +2 more sources