Results 71 to 80 of about 131,428 (235)

Powerful Radio-loud Quasars Are Triggered by Galaxy Mergers in the Cosmic Bright Ages

The Astrophysical Journal
While supermassive black holes are ubiquitous features of galactic nuclei, only a small minority are observed during episodes of luminous accretion. The physical mechanism(s) driving the onset of fueling and ignition in these active galactic nuclei (AGN)
Peter Breiding, Marco Chiaberge, Erini Lambrides, Eileen T. Meyer, S. P. Willner, Bryan Hilbert, Martin Haas, George Miley, Eric S. Perlman, Peter Barthel, Christopher P. O’Dea, Alessandro Capetti, Belinda Wilkes, Stefi A. Baum, Duccio F. Macchetto, William Sparks, Grant Tremblay, Colin Norman   +17 more
doaj   +1 more source

AGN Feedback Signatures in UV Emission

Galaxies
Supermassive black holes (SMBH) are believed to influence galaxy evolution through AGN (active galactic nuclei) feedback. Galaxy mergers are key processes of galaxy formation that lead to AGN activity and star formation.
K. Rubinur
doaj   +1 more source

HI absorption in Radio Galaxies [PDF]

Symposium - International Astronomical Union, 2002
Twenty-two powerful radio galaxies have been searched for HI absorption. We find the highest probability of detecting HI in absorption among narrow-line compact (or small) galaxies or galaxies with indication of richer interstellar medium (i.e. with ongoing or recent star-formation).
Tom Oosterloo, Clive Tadhunter, Raffaella Morganti, N. Killeen, G. van Moorsel   +4 more
openaire   +3 more sources

Feedback and Brightest Cluster Galaxy Formation: ACS Observations of the Radio Galaxy TN J1338--1942 at z=4.1

, 2005
We present deep optical imaging of the z=4.1 radio galaxy TN J1338--1942 obtained using the ACS on-board HST. The radio galaxy is known to reside within a large galaxy overdensity (both in physical extent and density contrast).
A. R. Martel, Andrew W. Zirm, Antonucci R., B. Holden, B. Venemans, Brocklehurst M., C. De Breuck, C. Gronwall, C. J. Burrows, D. A. Golimowski, D. R. Ardila, De Breuck C., De Breuck C., Dickson R., E. S. Cheng, F. Bartko, F. Menanteau, G. D. Illingworth, G. F. Hartig, G. K. Miley, G. R. Meurer, H. C. Ford, H. D. Tran, H. J. A. Rottgering, J. E. Krist, J. P. Blakeslee, Jorgensen I., Kurk J. D., L. D. Bradley, L. Infante, M. Clampin, M. Franx, M. P. Lesser, M. Postman, M. Sirianni, N. Benitez, N. Homeier, N. J. G. Cross, P. D. Feldman, P. Rosati, Pentericci L., R. A. Brown, R. A. Kimble, R. A. Overzier, R. Demarco, R. J. Bouwens, R. L. White, Rees M. J., S. Mei, T. Goto, T. J. Broadhurst, V. Motta, van Ojik R., W. B. Sparks, W. Zheng, West M. J., Z. I. Tsvetanov   +56 more
core   +1 more source

A search for clusters at high redshift - III. Candidate H-alpha emitters and EROs in the PKS 1138-262 proto-cluster at z=2.16 [PDF]

, 2004
In this paper we present deep VLT multi wavelength imaging observations of the field around the radio galaxy PKS 1138-262 aimed at detecting and studying a (potential) proto-cluster centered at this radio source.
Abell, Bahcall, Bahcall, Beers, Bertin, Best, Bower, Bruzual, Buat, Bunker, Butcher, Carilli, Carilli, Cowie, Cowie, Daddi, Daddi, De Breuck, De Breuck, De Propris, Dey, Donahue, Dressler, Eggen, Eke, Elston, Elston, Feigelson, Fynbo, Fynbo, Fynbo, Gladders, Glazebrook, Hamuy, Hamuy, Hill, Hoeg, Hu, Iglesias-Páramo, Infante, Ivison, Jarvis, Kauffmann, Kauffmann, Kennicutt, Kennicutt, Kennicutt, Kron, Kurk, Kurk, Lacy, Lacy, Leitherer, Madau, McLure, Moorwood, Møller, Nakata, Oke, Ouchi, Pentericci, Pentericci, Pentericci, Pentericci, Pentericci, Pozzetti, Prentice, Refregier, Rhoads, Rhoads, Rosati, Rosati, Röttgering, Salpeter, Schlegel, Scodeggio, Small, Stanford, Stanford, Stanford, Steidel, Steidel, Stiavelli, Taylor, van Breugel, van der Werf, van Dokkum, van Dokkum, van Dokkum, Venemans, Yates   +90 more
core   +4 more sources

The Microjansky Radio Galaxy Population [PDF]

The Astrophysical Journal, 2007
20 pages, Accepted by The Astrophysical Journal (scheduled for 1 Jan 2007), color figures 2 and 3 can be found at http://www.astro.wisc.edu/~barger/radiopaper ...
Wei-Hao Wang, Amy J. Barger, Amy J. Barger, Lennox L. Cowie   +3 more
openaire   +2 more sources

The Radio Luminosity Function of Cluster Radio Halos [PDF]

, 2002
A significant fraction of galaxy clusters exhibits cluster wide radio halos. We give a simple prediction of the local and higher redshift radio halo luminosity function (RHLF) on the basis of (i) an observed and a theoretical X-ray cluster luminosity ...
Ensslin, Torsten A., Roettgering, Huub
core   +3 more sources

High-energy Neutrino Constraints on Cosmic-Ray Reacceleration in Radio Halos of Massive Galaxy Clusters

The Astrophysical Journal, 2023
A fraction of merging galaxy clusters host diffuse radio emission in their central region, termed a giant radio halo (GRH). The most promising mechanism of GRHs is the reacceleration of nonthermal electrons and positrons by merger-induced turbulence ...
Kosuke Nishiwaki, Katsuaki Asano, Kohta Murase   +2 more
doaj   +1 more source

Radio Galaxy Classification: #Tags, Not Boxes

Galaxies, 2021
After six decades of studying radio galaxies, we are now delightfully overwhelmed by their exponentially expanding numbers and the complexity of their structures.
Lawrence Rudnick
doaj   +1 more source

A Complete Sample of Radio Galaxies [PDF]

Symposium - International Astronomical Union, 1982
We report here some preliminary results of a multi-wavelength study of a complete sample of radio galaxies. The sample is comprised of 93 radio sources from the Parkes 11 cm catalog which are identified with galaxies of 17th magnitude or brighter in the declination zone −17° to −40°. Our objective is to cross-correlate the radio, infrared, optical, and
P. A. Shaver, Jasper Wall, David Malin, Wm Goss, R. A. E. Fosbury, I. J. Danziger, Ron Ekers, A. F. M. Moorwood   +7 more
openaire   +2 more sources