The Optical Properties of Radio Galaxies

From the VLA 20cm survey of ≃ 500 Abell clusters reported by (Ledlow and Owen, 1995), we have obtained optical R-Band CCD observations and optical spectra for 265 radio galaxies. The survey is complete for 20cm flux density greater than 10 mJy within 0.3 corrected Abell radii of the cluster center. All Abell clusters with measured z < 0.09 were surveyed. This statistically complete sample was supplemented by ≃ 200 clusters with 0.09 < z < 0.25 including sources with flux density > 200 mJy. Only 6% of the sample consists of FR II radio sources, the remainder are twin-jets, tailed, or compact sources associated with the FR I class.

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Optical Properties of B2 Radio Galaxies

Extragalactic Radio Sources ◽

10.1007/978-94-009-0295-4_85 ◽

1996 ◽

pp. 240-241

Author(s):

J. I. González-Serrano ◽

R. Carballo

Keyword(s):

Optical Properties ◽

Radio Galaxies

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Radio Galaxies and Relativistic Beaming

Symposium - International Astronomical Union ◽

10.1017/s0074180900134151 ◽

1988 ◽

Vol 129 ◽

pp. 107-107

Author(s):

D. J. Saikia

Keyword(s):

Optical Properties ◽

Radio Galaxies ◽

Line Of Sight ◽

Statistical Indicator ◽

Relativistic Beaming ◽

Extended Radio ◽

Statistical Studies ◽

Source Orientation

There have been recent suggestions and suspicions that the earlier unified scheme, which largely involved quasars, could be enlarged upon to include galaxies as well. In this scheme, the extended radio galaxies are believed to be close to the plane of the sky while the lobe and core-dominated quasars are seen at progressively smaller angles to the line-of-sight. In this paper, we study the correlations of the degree of core prominence with optical properties as well as radio structures on VLBI and larger scales for the both radio galaxies and quasars, in order to investigate whether they are consistent with the enlarged unified scheme. From earlier statistical studies of quasar samples, the degree of core prominence has been shown to be a reasonable statistical indicator of source orientation (cf., Saikia 1985 and references therein). Saikia (1984) also showed that jets in quasars are more easily detected in the ones with more prominent cores, consistent with the unified scheme. In the present paper, we present the results of our observations of 30 low-luminosity radio galaxies and investigate whether such a result holds for galaxies as well.

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X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure

The Astrophysical Journal ◽

10.3847/1538-4357/ab536f ◽

2019 ◽

Vol 887 (2) ◽

pp. 266 ◽

Cited By ~ 2

Author(s):

Ravi Joshi ◽

Gopal Krishna ◽

Xiaolong Yang ◽

Jingjing Shi ◽

Si-Yue Yu ◽

...

Keyword(s):

Optical Properties ◽

Large Scale ◽

Radio Galaxies ◽

Radio Structure

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Optical Properties of High Redshift Radio Galaxies

Symposium - International Astronomical Union ◽

10.1017/s0074180900141956 ◽

1989 ◽

Vol 134 ◽

pp. 543-545

Author(s):

Patrick J. McCarthy ◽

Hyron Spinrad ◽

Wil van Breugel

Keyword(s):

Optical Properties ◽

High Redshift ◽

Radio Galaxies ◽

Radio Sources ◽

Complete Sample ◽

Redshift Range ◽

Extragalactic Radio Sources ◽

Look Back ◽

Hubble Time

The 3CR catalogue of extragalactic radio sources is now completely identified for b > 15° and redshifts have been determined for > 98% of them (see Djorgovski et al. 1988 for the latest update). The radio galaxies in this catalogue span the redshift range from 0 to 2.48. This sample provides us with a unique opportunity to examine the optical and radio properties of a complete sample over a look-back time comparable to the Hubble time.

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Optical Properties of B2 Radio Galaxies

Symposium - International Astronomical Union ◽

10.1017/s0074180900080645 ◽

1996 ◽

Vol 175 ◽

pp. 240-241

Author(s):

J.I. González-Serrano ◽

R. Carballo

Keyword(s):

Optical Properties ◽

Local Environment ◽

Radio Galaxies ◽

Radio Sources ◽

Host Galaxies ◽

Ccd Imaging ◽

Large Program ◽

The Galaxy

We present a large program of CCD imaging of low-luminosity radio galaxies selected from the B2 survey of radio sources. We aim to study their optical properties: brightness profiles, isophotal distortions, morphological peculiarities. As the sample contains jet and no-jet sources, this investigation will allow us to compare both populations of low-luminosity radio galaxies. In particular, we will study the local environment and test whether the galaxy density around radio sources plays an important role on the presence of jets or not. The analysis of morphological distortions on the host galaxies will provide us with detailed information on past or recent galaxy encounters.

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Optical Properties of the Radio Source B2 0828+32

Symposium - International Astronomical Union ◽

10.1017/s0074180900080712 ◽

1996 ◽

Vol 175 ◽

pp. 254-255

Author(s):

M.-H. Ulrich-Demoulin ◽

J. Rönnback

Keyword(s):

Optical Properties ◽

Radio Source ◽

Spectral Index ◽

Surface Brightness ◽

Gravitational Interaction ◽

Radio Galaxies ◽

Host Galaxy ◽

Radio Structure ◽

Close Pair ◽

Different Ages

A small number of radio galaxies have two sets of classical double radio lobes with the radio axes aligned in different directions. Furthermore differences in the properties of the radio lobes such as the surface brightness and spectral index indicate that the two sets of double radio structure have different ages. The radio ejection axis has therefore changed direction with time. In the first two known radio galaxies of this type, 3C 315 and B2 0055+26, the host galaxy is a member of a close pair of ellipticals in a common optical envelope suggesting that the complex radio structure is caused by gravitational interaction.

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