High-redshift radio galaxies

2007 ◽  
pp. 42-52
Author(s):  
George Miley
Keyword(s):  
High Redshift ◽  
Radio Galaxies

scholarly journals Lyα excess in high-redshift radio galaxies: a signature of star formation★

2007 ◽  
Vol 375 (4) ◽  
pp. 1299-1310 ◽  
Author(s):  
M. Villar-Martín ◽  
A. Humphrey ◽  
C. De Breuck ◽  
R. Fosbury ◽  
L. Binette ◽  
...  
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
Radio Galaxies

scholarly journals Spatially resolved studies of extragalactic jets in high redshift radio galaxies

2014 ◽  
Vol 10 (S313) ◽  
pp. 231-235
Author(s):  
Leah K. Morabito ◽  
Adam Deller ◽  
J. B. R. Oonk ◽  
Huub Röttgering ◽  
George Miley
Keyword(s):  
High Redshift ◽  
Low Frequency ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Spatially Resolved ◽  
Long Baseline ◽  
Early Results ◽  
Spectrum Radio ◽  
Extragalactic Jets ◽  
Frequency Survey

AbstractThe correlation between radio spectral steepness and redshift has been successfully used to find high redshift (z ⩾ 2) radio galaxies, but the origin of this relation is unknown. The ultra-steep spectra of high-z radio sources make them ideally suited for studies with the Low Band Antenna of the new Low Frequency Array, which covers 10–80 MHz and has baselines up to about 1300 km. As part of an ongoing survey, we use the longest baselines to map the low-frequency (< 70 MHz) spatial distributions along the jets of 5 bright extended steep spectrum high-z radio sources. From this, we will determine whether the spectra change over these spatially resolved sources, thereby constraining particle acceleration processes. We present early results from our low-frequency survey of ultra-steep spectrum radio galaxies. The first low frequency long baseline images of these objects are presented.

scholarly journals High-redshift radio galaxies and divergence from the CMB dipole

2017 ◽  
Vol 471 (1) ◽  
pp. 1045-1055 ◽  
Author(s):  
Jacques Colin ◽  
Roya Mohayaee ◽  
Mohamed Rameez ◽  
Subir Sarkar
Keyword(s):  
High Redshift ◽  
Radio Galaxies

Giant quiescent haloes associated with high redshift radio galaxies

2003 ◽  
Vol 47 (4-5) ◽  
pp. 291-297 ◽  
Author(s):  
M Villar-Martín
Keyword(s):  
High Redshift ◽  
Radio Galaxies

scholarly journals The SINFONI survey of powerful radio galaxies at z ~ 2: Jet-driven AGN feedback during the Quasar Era

2017 ◽  
Vol 599 ◽  
pp. A123 ◽  
Author(s):  
N. P. H. Nesvadba ◽  
C. De Breuck ◽  
M. D. Lehnert ◽  
P. N. Best ◽  
C. Collet
Keyword(s):  
Kinetic Energy ◽  
Interstellar Medium ◽  
Large Scale ◽  
High Redshift ◽  
Radio Galaxies ◽  
Energy Output ◽  
Host Galaxy ◽  
Powerful Radio ◽  
Massive Galaxies ◽  
Gas Kinematics

We present VLT/SINFONI imaging spectroscopy of the rest-frame optical emission lines of warm ionized gas in 33 powerful radio galaxies at redshifts z ≳ 2, which are excellent sites to study the interplay of rapidly accreting active galactic nuclei and the interstellar medium of the host galaxy in the very late formation stages of massive galaxies. Our targets span two orders of magnitude in radio size (2−400 kpc) and kinetic jet energy (a few 1046– almost 1048 erg s-1). All sources have complex gas kinematics with broad line widths up to ~1300 km s-1. About half have bipolar velocity fields with offsets up to 1500 km s-1 and are consistent with global back-to-back outflows. The others have complex velocity distributions, often with multiple abrupt velocity jumps far from the nucleus of the galaxy, and are not associated with a major merger in any obvious way. We present several empirical constraints that show why gas kinematics and radio jets seem to be physically related in all galaxies of the sample. The kinetic energy in the gas from large scale bulk and local outflow or turbulent motion corresponds to a few 10-3 to 10-2 of the kinetic energy output of the radio jet. In galaxies with radio jet power ≳ 1047 erg s-1, the kinetic energy in global back-to-back outflows dominates the total energy budget of the gas, suggesting that bulk motion of outflowing gas encompasses the global interstellar medium. This might be facilitated by the strong gas turbulence, as suggested by recent analytical work. We compare our findings with recent hydrodynamic simulations, and discuss the potential consequences for the subsequent evolution of massive galaxies at high redshift. Compared with recent models of metal enrichment in high-z AGN hosts, we find that the gas-phase metallicities in our galaxies are lower than in most low-z AGN, but nonetheless solar or even super-solar, suggesting that the ISM we see in these galaxies is very similar to the gas from which massive low-redshift galaxies formed most of their stars. This further highlights that we are seeing these galaxies near the end of their active formation phase.

scholarly journals High Redshift Radio Galaxies: Laboratories for Massive Galaxy and Cluster Formation in the Early Universe

2010 ◽  
Author(s):  
G. Miley ◽  
C. Carilli ◽  
G. B. Taylor ◽  
C. de Breuck ◽  
A. Cohen
Keyword(s):  
Early Universe ◽  
High Redshift ◽  
Cluster Formation ◽  
Radio Galaxies ◽  
Massive Galaxy

scholarly journals A 327 MHz VLBI study of high redshift radio galaxies 1345+245, 1809+407 and 2349+289

2002 ◽  
Vol 381 (2) ◽  
pp. 401-407 ◽  
Author(s):  
Z. Cai ◽  
R. Nan ◽  
R. T. Schilizzi ◽  
G. K. Miley ◽  
M. A. R. Bremer ◽  
...  
Keyword(s):  
High Redshift ◽  
Radio Galaxies

scholarly journals The Mass of Radio Galaxies from Low to High Redshift

2006 ◽  
pp. 148-153
Author(s):  
Matt J. Jarvis ◽  
Steve Rawlings ◽  
Steve Eales ◽  
Katherine M. Blundell ◽  
Chris J. Willott
Keyword(s):  
High Redshift ◽  
Radio Galaxies

scholarly journals Searches for High Redshift Radio Galaxies

1998 ◽  
pp. 185-190 ◽  
Author(s):  
Carlos De Breuck ◽  
Wil Van Breugel ◽  
Huub Röttgering ◽  
George Miley
Keyword(s):  
High Redshift ◽  
Radio Galaxies

scholarly journals The age of high-redshift radio galaxies

1990 ◽  
Vol 242 (4) ◽  
pp. 570-575 ◽  
Author(s):  
M. Bithell ◽  
M. J. Rees
Keyword(s):  
High Redshift ◽  
Radio Galaxies
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