A Radio-Quiet Radio Galaxy at High Redshift

2006 ◽  
pp. 158-159
Author(s):  
Daniel Stern ◽  
Edward C. Moran
Keyword(s):  
Radio Galaxy ◽  
High Redshift

scholarly journals Spectroscopic characterization of the protocluster of galaxies around 7C 1756+6520 at z ~ 1.4

2018 ◽  
Vol 618 ◽  
pp. A128 ◽  
Author(s):  
V. Casasola ◽  
L. Magrini ◽  
F. Combes ◽  
E. Sani ◽  
J. Fritz ◽  
...  
Keyword(s):  
Near Infrared ◽  
Radio Galaxy ◽  
High Redshift ◽  
Theoretical Models ◽  
Spectroscopic Characterization ◽  
Emission Lines ◽  
Peculiar Velocities ◽  
Long Time ◽  
High Fraction

Aims. The aim of this paper is the spectroscopic study of 13 galaxies belonging to the field of the protocluster associated with the radio galaxy 7C 1756+6520 at z = 1.4156. In particular, we focus on the characterization of the nuclear activity. Methods. This analysis has been performed on rest-frame optical spectra taken with the Large Binocular Telescope, using the spectrograph LUCI, which is operative in the near-infrared domain. The adopted spectral coverage allowed us to observe emission lines such as Hα, Hβ, [O III]λ 5007 Å, and [N II]λ 6583 Å at the redshift of the central radio galaxy. We observed the central part of the protocluster, which is suitable to include the radio galaxy, several spectroscopically confirmed active galactic nuclei (AGN) belonging to the protocluster, and other objects that might be members of the protocluster. Results. For four previously identified protocluster members, we derived the redshift by detecting emission lines that have never detected before for these galaxies. We identified a new protocluster member and eight new possible protocluster members. The stacked spectrum of the galaxies in which we detected the [O III]λ 5007 Å emission line revealed the second line of the [O III] doublet at 4959 Å and the Hβ line, which confirms that they belong to the protocluster. By collecting all members identified so far in this work and other members from the literature, we defined 31 galaxies, including the central radio galaxy, around the redshift 1.4152 ± 0.056. This corresponds to peculiar velocities ≲5000 km s−1 with respect to the radio galaxy. The position versus velocity phase-space diagram suggests that three AGN of the protocluster and the central radio galaxy might be a virialized population that has been coexisting for a long time in the densest core region of this forming structure. This protocluster is characterized by a high fraction of AGN (~23%). For one of them, AGN1317, we produced two so-called Baldwin, Phillips & Terlevich (BPT) diagrams. The high fraction of AGN and their distribution within the protocluster seem to be consistent with predictions of some theoretical models on AGN growth and feedback. These models are based on galaxy interactions and ram pressure as triggers of AGN activity. Conclusions. The high fraction of AGN belonging to the protocluster suggests that they were likely triggered at the same time, maybe by the ongoing formation of the protocluster. Observations of AGN in this protocluster and in other distant clusters will help clarifying whether the resulting high fraction of AGN is unusual or typical for such structures at high redshift. Our next step will be analyses of previously acquired high-resolution radio data of the central radio galaxy to derive information on the nature of the radio galaxy and connect it with its cosmic evolution.

An optically luminous radio galaxy at Z = 3.22 and the K-z diagram at high redshift

1993 ◽  
Vol 409 ◽  
pp. 578 ◽  
Author(s):  
Stephen A. Eales ◽  
Steve Rawlings ◽  
Mark Dickinson ◽  
Hyron Spinrad ◽  
Gary J. Hill ◽  
...  
Keyword(s):  
Radio Galaxy ◽  
High Redshift

An Obscured Radio Galaxy at High Redshift

2003 ◽  
Vol 582 (2) ◽  
pp. L71-L74 ◽  
Author(s):  
Michiel Reuland ◽  
Wil van Breugel ◽  
Huub Röttgering ◽  
Wim de Vries ◽  
Carlos De Breuck ◽  
...  
Keyword(s):  
Radio Galaxy ◽  
High Redshift

scholarly journals Broad H  emission in the high-redshift radio galaxy 3C 22

1995 ◽  
Vol 272 (1) ◽  
pp. L5-L8 ◽  
Author(s):  
F. Economou ◽  
A. Lawrence ◽  
M. J. Ward ◽  
P. R. Blanco
Keyword(s):  
Radio Galaxy ◽  
High Redshift

scholarly journals On the Origin of the Ultraviolet Continuum Emission from the High-Redshift Radio Galaxy 3C 256

1996 ◽  
Vol 465 ◽  
pp. 157 ◽  
Author(s):  
Arjun Dey ◽  
Andrea Cimatti ◽  
Wil van Breugel ◽  
Robert Antonucci ◽  
Hyron Spinrad
Keyword(s):  
Radio Galaxy ◽  
High Redshift ◽  
Continuum Emission ◽  
Ultraviolet Continuum

scholarly journals Optical detection of a GMRT-detected candidate high-redshift radio galaxy with 3.6-m Devasthal optical telescope

2019 ◽  
Vol 40 (2) ◽  
Author(s):  
A. Omar ◽  
A. Saxena ◽  
K. Chand ◽  
A. Paswan ◽  
H. J. A. Röttgering ◽  
...  
Keyword(s):  
Radio Galaxy ◽  
High Redshift ◽  
Optical Detection ◽  
Optical Telescope

scholarly journals Optical Polarization of 3C 265

1996 ◽  
Vol 175 ◽  
pp. 223-226 ◽  
Author(s):  
M.H. Cohen ◽  
H.D. Tran ◽  
P.M. Ogle ◽  
R.W. Goodrich
Keyword(s):  
Emission Line ◽  
Radio Galaxy ◽  
High Redshift ◽  
Optical Polarization ◽  
Alignment Effect ◽  
Distant Galaxies ◽  
Extended Emission

3C 265 is a high-redshift (z=0.811) radio galaxy showing extended emission line regions (EELR) to 50 kpc from the nucleus (McCarthy et al 1995). However, it does not show the alignment effect (McCarthy 1993) that is common in distant galaxies: the EELR is not extended along the radio axis.

Detection of polarized ultraviolet emission from the high-redshift radio galaxy 3C 265

1991 ◽  
Vol 366 ◽  
pp. L69 ◽  
Author(s):  
Buell T. Jannuzi ◽  
Richard Elston
Keyword(s):  
Radio Galaxy ◽  
High Redshift ◽  
Ultraviolet Emission

scholarly journals The Compton-thick quasar at the heart of the high-redshift giant radio galaxy 6C 0905+39

2008 ◽  
Vol 385 (1) ◽  
pp. L125-L129 ◽  
Author(s):  
M. C. Erlund ◽  
A. C. Fabian ◽  
Katherine M. Blundell ◽  
Carolin S. Crawford
Keyword(s):  
Radio Galaxy ◽  
High Redshift

CO Observations of the High Redshift Radio Galaxy 53W002

1995 ◽  
Vol 110 ◽  
pp. 1564 ◽  
Author(s):  
Toru Yamada ◽  
Kouji Ohta ◽  
Akihiko Tomita ◽  
Tadafumi Takata
Keyword(s):  
Radio Galaxy ◽  
High Redshift ◽  
Co Observations
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