scholarly journals Luminous Supernova Remnant Candidates in M82 and The Physical Properties of The Variable Radio Source 41.9+58

1983 ◽  
Vol 101 ◽  
pp. 583-590 ◽  
Author(s):  
P. P. Kronberg ◽  
P. Biermann
Keyword(s):  
Physical Properties ◽  
Radio Source ◽  
Supernova Remnant ◽  
Low Frequency ◽  
Nuclear Region ◽  
Large Numbers ◽  
Relativistic Particles ◽  
Bright Source ◽  
Variable Radio ◽  
Variable Radio Source

Large numbers (∼30) of supernova remnant candidates have been revealed in new VLA maps of the inner 600 pc of M82 with subarcsecond resolution. The flux density decrease of the bright source 41.9+58 in the M82 nuclear region is found to be occurring with an approximately constant spectral index of −0.9 at ν≳3 GHz, and the low frequency turnover has moved from ∼700 MHz in 1974–1975 to <400 MHz in 1979–81.A model of 41.9+58 is proposed in which it is, at least initially confined by its own hot (∼108K) pre-SN ejecta, and its relativistic particles are accelerated by a pulsar at its centre.

New highly variable radio source, possible counterpart of γ-ray source CG135+1

Nature ◽  
1978 ◽  
Vol 272 (5655) ◽  
pp. 704-706 ◽  
Author(s):  
P. C. GREGORY ◽  
A. R. TAYLOR
Keyword(s):  
Radio Source ◽  
Γ Ray ◽  
Variable Radio ◽  
Variable Radio Source

scholarly journals Strong, Variable Circular Polarization in PKS 1519–273

2001 ◽  
Vol 182 ◽  
pp. 135-138
Author(s):  
Jean-Pierre MacQuart ◽  
Lucyna Kedziora-Chudczer ◽  
David Jauncey ◽  
David Rayner
Keyword(s):  
Brightness Temperature ◽  
Frequency Dependence ◽  
Radio Source ◽  
Circular Polarization ◽  
Stokes Parameters ◽  
Variable Component ◽  
Circularly Polarized ◽  
Interstellar Scintillation ◽  
Variable Radio ◽  
Variable Radio Source

AbstractWe find strong (> 1%) circular polarization in the intraday-variable radio source PKS 1519–273. The source exhibits ~ 12 hourly variability in all four Stokes parameters at 4.8 and 8.6 GHz, and longer timescale variability at 2.5 and 1.4 GHz. The characteristics and frequency dependence of the variability suggest that it is due to interstellar scintillation. VSOP limits on the distance to the scattering screen constrain the brightness temperature to TB > 5 × 1013 K. The fluctuations in total intensity are well-correlated with those in circular polarization, implying that the variable component of the source is −3.8 ±0.4% circularly polarized at 4.8 GHz. The origin of the circular polarization is unclear.

A variable radio source in the clumpy irregular galaxy Markarian 297

1983 ◽  
Vol 267 ◽  
pp. L73 ◽  
Author(s):  
D. S. Heeschen ◽  
J. Heidmann ◽  
Q. F. Yin
Keyword(s):  
Radio Source ◽  
Irregular Galaxy ◽  
Variable Radio ◽  
Variable Radio Source

scholarly journals The Angular Size of the Variable Radio Source Hydra?A

1955 ◽  
Vol 8 (4) ◽  
pp. 564 ◽  
Author(s):  
AWL Carter
Keyword(s):  
Radio Source ◽  
Angular Size ◽  
Cosmic Radio ◽  
The Sun ◽  
Cosmic Radio Source ◽  
Variable Radio ◽  
Variable Radio Source

Slee (1955) has shown that the discrete cosmic radio source Hydra-A shows variations in intensity at metre wavelengths. This is the first variable radio source to be found, other than the Sun, although Ryle and Elsmore (1951) investigated about one hundred northerly sources and found no significant variations in their intensities over a period of 18 months. The observations to be described here were undertaken firstly to check the variability of the source, then suspected by Slee, and secondly to measure its angular size and see whether this might also be variable.

scholarly journals Universal time control of AKR: Earth is a spin-modulated variable radio source

2013 ◽  
Vol 118 (3) ◽  
pp. 1123-1131 ◽  
Author(s):  
Akira Morioka ◽  
Yoshizumi Miyoshi ◽  
Satoshi Kurita ◽  
Yasumasa Kasaba ◽  
Vassilis Angelopoulos ◽  
...  
Keyword(s):  
Radio Source ◽  
Universal Time ◽  
Time Control ◽  
Variable Radio ◽  
Variable Radio Source
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