The origin of the optical emission lines associated with extragalactic radio sources

1992 ◽  
Vol 384 ◽  
pp. 467 ◽  
Author(s):  
S. M. Viegas ◽  
E. M. de Gouveia dal Pino
Keyword(s):  
Optical Emission ◽  
Emission Lines ◽  
Radio Sources ◽  
Extragalactic Radio Sources

scholarly journals The Impact of the Early Stages of Radio Source Evolution on the ISM of the Host Galaxies

2003 ◽  
Vol 20 (1) ◽  
pp. 129-133 ◽  
Author(s):  
R. Morganti ◽  
C. N. Tadhunter ◽  
T. A. Oosterloo ◽  
J. Holt ◽  
A. Tzioumis ◽  
...  
Keyword(s):  
Radio Source ◽  
Radio Galaxy ◽  
Optical Emission ◽  
The Other ◽  
Emission Lines ◽  
Radio Sources ◽  
Host Galaxies ◽  
Cygnus A ◽  
Intermediate Size ◽  
The Impact

AbstractThe study of both neutral and ionised gas in young radio sources is providing key information on the effect the radio plasma has on the ISM of these objects. We present results obtained for the compact radio sources PKS 1549–79, 4C 12.50 and PKS 1814–63 and for the intermediate-size radio galaxy 3C 459. At least in the first two, low ionisation optical emission lines and HI absorption appear to be associated with the extended, but relatively quiescent, dusty cocoon surrounding the nucleus. The [OIII] lines are, on the other hand, mostly associated with the region of interaction between the radio plasma and the ISM, indicating a fast outflow from the centre. A case of fast outflow (up to ∼1000 km s-1) is also observed in HI in the radio source 4C 12.50. As the radio source evolves, any obscuring material along the radio axis is swept aside until, eventually, cavities (of the same kind as observed e.g. in Cygnus A) are hollowed out on either side of the nucleus. We may witness this phase in the evolution of a radio source in the radio galaxy 3C 459.

scholarly journals Neutral hydrogen in elliptical galaxies with nuclear radio sources and optical emission lines

1982 ◽  
Vol 259 ◽  
pp. 55 ◽  
Author(s):  
L. L. Dressel ◽  
T. M. Bania ◽  
R. W. Oconnell
Keyword(s):  
Neutral Hydrogen ◽  
Optical Emission ◽  
Elliptical Galaxies ◽  
Emission Lines ◽  
Radio Sources

scholarly journals Compact Radio Sources in the Nuclei of Elliptical Galaxies

1972 ◽  
Vol 44 ◽  
pp. 222-223 ◽  
Author(s):  
R. D. Ekers
Keyword(s):  
Radio Emission ◽  
Angular Size ◽  
Optical Emission ◽  
Elliptical Galaxies ◽  
Emission Lines ◽  
Radio Sources ◽  
Radio Luminosity ◽  
Compact Source ◽  
Extended Radio

Ten percent of the intrinsically bright elliptical galaxies contain compact radio sources (angular size < 3 arc sec) with radio luminosity ∼ 1040 erg s−1. The presence of a compact source is correlated with the presence of extended radio emission and with the presence of optical emission lines.

scholarly journals Optical–Radio Connections AGN Illumination or Jet/cloud Interactions?

1996 ◽  
Vol 175 ◽  
pp. 217-222
Author(s):  
Clive N. Tadhunter
Keyword(s):  
Emission Line ◽  
Optical Emission ◽  
Radio Galaxies ◽  
Spectral Energy ◽  
Radio Sources ◽  
Early Type ◽  
Spectral Energy Distributions ◽  
Energy Distributions ◽  
Extragalactic Radio Sources ◽  
Radio Power

Many of the most important discoveries in the study of extragalactic radio sources have resulted from investigations of the relationships between optical and radio properties. The optical/radio connections include: correlations between optical emission line luminosity and radio power; alignments between optical/UV and radio structures; and UV excesses in the spectral energy distributions of radio galaxies compared with normal early-type galaxies.

Excitation of the Optical Emission Lines in Quasi-Stellar Radio Sources

1966 ◽  
Vol 143 ◽  
pp. 268 ◽  
Author(s):  
Donald E. Osterbrock ◽  
Robert A. R. Parker
Keyword(s):  
Optical Emission ◽  
Emission Lines ◽  
Radio Sources

scholarly journals Low-Luminosity Active Nuclei in Elliptical Galaxies

1987 ◽  
Vol 121 ◽  
pp. 443-450
Author(s):  
Elaine M. Sadler
Keyword(s):  
Optical Emission ◽  
Radio Galaxies ◽  
Elliptical Galaxies ◽  
Emission Lines ◽  
Gas Content ◽  
Radio Sources ◽  
Simple Relationship ◽  
Early Type ◽  
Optical Emission Spectrum ◽  
Radio Power

The results of a sensitive radio and optical survey of nearby early-type galaxies show that most (perhaps all) bright ellipticals have ‘active’ nuclei. These are characterized by a central non-thermal radio source and a weak LINER-like optical emission spectrum. There appears to be a smooth continuity in optical and radio properties from the weakest nearby sources to strong radio galaxies. Galaxies with radio sources usually show optical emission lines, but there is no simple relationship between gas content and radio power.

scholarly journals Extragalactic Radio Sources with Steep Low Frequency Spectra

1973 ◽  
Vol 165 (3) ◽  
pp. 259-269 ◽  
Author(s):  
J. E. Baldwin ◽  
P. F. Scott
Keyword(s):  
Low Frequency ◽  
Radio Sources ◽  
Frequency Spectra ◽  
Extragalactic Radio Sources

Super-luminal expansion in extragalactic radio sources

Nature ◽  
1977 ◽  
Vol 267 (5608) ◽  
pp. 211-216 ◽  
Author(s):  
R. D. Blandford ◽  
C. F. McKee ◽  
M. J. Rees
Keyword(s):  
Radio Sources ◽  
Extragalactic Radio Sources

Origin of the central radio gaps in extragalactic radio sources

1992 ◽  
Vol 187 (2) ◽  
pp. 209-214 ◽  
Author(s):  
I. E. Ekejiuba ◽  
P. N. Okeke ◽  
S. E. Okoye
Keyword(s):  
Radio Sources ◽  
Extragalactic Radio Sources

scholarly journals Relativistic parametric instabilities in extended extragalactic radio sources

1978 ◽  
Vol 182 (1) ◽  
pp. 49-62 ◽  
Author(s):  
A. Ferrari ◽  
E. Trussoni ◽  
L. Zaninetti
Keyword(s):  
Radio Sources ◽  
Extragalactic Radio Sources ◽  
Parametric Instabilities
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