Compact radio source 1413 + 135 is a far-IR extragalactic object

Nature ◽  
1981 ◽  
Vol 293 (5835) ◽  
pp. 711-713 ◽  
Author(s):  
C. A. Beichman ◽  
G. Neugebauer ◽  
B. T. Soifer ◽  
H. A. Wootten ◽  
T. Roellig ◽  
...  
2006 ◽  
Vol 648 (1) ◽  
pp. 148-157 ◽  
Author(s):  
Hiroshi Nagai ◽  
Makoto Inoue ◽  
Keiichi Asada ◽  
Seiji Kameno ◽  
Akihiro Doi

2013 ◽  
Vol 552 ◽  
pp. A109 ◽  
Author(s):  
S. Frey ◽  
Z. Paragi ◽  
K. É. Gabányi ◽  
T. An

Quasars ◽  
1986 ◽  
pp. 157-158
Author(s):  
J. Biretta ◽  
M. Cohen ◽  
R. Moore

1989 ◽  
Vol 136 ◽  
pp. 535-541 ◽  
Author(s):  
Jun-Hui Zhao ◽  
R. D. Ekers ◽  
W. M. Goss ◽  
K. Y. Lo ◽  
Ramesh Narayan

We investigate the long-term flux density variations of the compact radio source Sgr A∗ at the galactic center by combining recent VLA observations with previous Green Bank interferometer data. We present radio flux density light-curves for Sgr A∗ at 20, 11, 6 and 3.7 cm from 1974 to 1987. Long-term variability with a timescale of at least 5 years is seen at 20 cm and there is evidence for more rapid variations at the shorter wavelengths. The variability timescales at 20, 11 and 6 cm fit the λ2 scaling predicted by the theory of refractive scintillation suggesting that the variability could be due to this cause. However, the timescales are relatively short, implying an unusually high velocity in the scattering screen. The modulation index of the variability is large and relatively independent of wavelength.


1977 ◽  
Vol 218 ◽  
pp. 668 ◽  
Author(s):  
K. Y. Lo ◽  
M. H. Cohen ◽  
R. T. Schilizzi ◽  
H. N. Ross

1984 ◽  
Vol 279 ◽  
pp. 112 ◽  
Author(s):  
N. Bartel ◽  
I. I. Shapiro ◽  
J. P. Huchra ◽  
H. Kuhr

1977 ◽  
Vol 215 ◽  
pp. L5 ◽  
Author(s):  
B. J. Geldzahler ◽  
K. I. Kellermann ◽  
D. B. Shaffer ◽  
B. G. Clark

1990 ◽  
Vol 349 ◽  
pp. L47 ◽  
Author(s):  
R. L. Mutel ◽  
Jean-Francois Lestrade

1996 ◽  
Vol 175 ◽  
pp. 23-24
Author(s):  
D.L. Jones ◽  
S.J. Tingay ◽  
R.A. Preston ◽  
D.L. Jauncey ◽  
J.E. Reynolds ◽  
...  

Centaurus A (NGC 5128) is the nearest giant radio galaxy. It is a Fanaroff-Riley type 1 (low luminosity) radio source, but the compact radio source in the nucleus is strong enough that VLBI imaging has been possible with both the SHEVE array and the VLBA at several frequencies. These observations have detected a sub-parsec scale counterjet. This shows that jet formation in at least some FR I sources is intrinsically two-sided over very small distances and the radio jets in Centaurus A are probably only moderately relativistic. We also find evidence that the center of activity in Centaurus A is partially obscured by a disk or torus of dense plasma.


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