Optical Emission from the Extended Radio Source 3C277.3 = Coma-A

1981 ◽  
Vol 247 ◽  
pp. L5 ◽  
Author(s):  
G. K. Miley ◽  
T. M. Heckman ◽  
H. R. Butcher ◽  
W. J. M. van Breugel
Keyword(s):  
Radio Source ◽  
Optical Emission ◽  
Extended Radio ◽  
Extended Radio Source

scholarly journals Radio Galaxy Zoo: compact and extended radio source classification with deep learning

2018 ◽  
Vol 476 (1) ◽  
pp. 246-260 ◽  
Author(s):  
V Lukic ◽  
M Brüggen ◽  
J K Banfield ◽  
O I Wong ◽  
L Rudnick ◽  
...  
Keyword(s):  
Deep Learning ◽  
Radio Source ◽  
Radio Galaxy ◽  
Extended Radio ◽  
Extended Radio Source

1400 + 162 - an extended radio source identified with a BL Lacertae object in a group of galaxies

1977 ◽  
Vol 215 ◽  
pp. 408 ◽  
Author(s):  
J. A. Baldwin ◽  
E. J. Wampler ◽  
E. M. Burbidge ◽  
S. L. Odell ◽  
H. E. Smith ◽  
...  
Keyword(s):  
Radio Source ◽  
Bl Lacertae ◽  
Extended Radio ◽  
Extended Radio Source

scholarly journals A multiwavelength study of the dual nuclei in Mrk 212

2020 ◽  
Vol 500 (3) ◽  
pp. 3908-3919
Author(s):  
K Rubinur ◽  
P Kharb ◽  
M Das ◽  
P T Rahna ◽  
M Honey ◽  
...  
Keyword(s):  
Radio Source ◽  
Galactic Nuclei ◽  
Optical Emission ◽  
Radio Observations ◽  
Radio Structure ◽  
Very Large Array ◽  
Extended Radio ◽  
The Galaxy ◽  
Double Radio Source ◽  
Tidal Tails

ABSTRACT We present radio observations of the galaxy merger remnant Mrk 212 with the Karl G. Jansky Very Large Array (VLA) and the upgraded Giant Meter Radio Telescope (uGMRT). Mrk 212 has two previously known radio sources associated with the two optical nuclei, S1 and S2, with a projected separation of ∼6 kpc, making it a dual active galactic nuclei (AGN) candidate. Our new 15-GHz VLA observations reveal that S1 is a double radio source centred around the optical nucleus; its total extent is ∼750 pc its average 1.4−8.5 GHz spectral index is −0.81 ± 0.06. S1 therefore resembles a compact symmetric object. The 15-GHz VLA image identifies the radio source at S2 to be a compact core. Our radio observations therefore strongly support the presence of a dual AGN in Mrk 212. The optical emission line flux ratios obtained from the Himalayan Chandra Telescope (HCT) observations however, show that S1 and S2 both fall in the AGN + star formation (SF) region of the Baldwin, Philips and Terlevich (BPT) diagram. Weak AGN lying in the SF or AGN + SF intermediate regions in the BPT diagram have indeed been reported in the literature; our sources clearly fall in the same category. We find an extended radio structure in our newly reduced 8.5-GHz-VLA data, that is offset by ∼1 arcsec from the optical nucleus S2. New deep FUV and NUV observations with the Ultraviolet Imaging Telescope aboard AstroSat reveal SF knots around S2 as well as kpc-scale tidal tails; the SF knots around S2 coincide with the extended radio structure detected at 8.5 GHz. The radio spectral indices are consistent with SF. Any possible association with the AGN in S2 is unclear at this stage.

scholarly journals Twenty-one-cm Studies of Some Interstellar Clouds

1958 ◽  
Vol 8 ◽  
pp. 931-934
Author(s):  
R. D. Davies
Keyword(s):  
High Resolution ◽  
Brightness Temperature ◽  
Radio Source ◽  
Continuous Spectrum ◽  
Flux Density ◽  
Interstellar Clouds ◽  
Extended Radio ◽  
Two Sides ◽  
Galactic Longitude ◽  
Extended Radio Source

Cygnus-x is an extended radio source centered at δ=40° and R.A. = 20h25m (l=48°, b=0°). Its emission in the continuous spectrum has been studied by Davies using high resolution surveys at the following frequencies: 92, 158, and 1425 Mcps, 242, 400, 600, and 900 Mcps. The background emission at the position of the source was removed by a smooth interpolation in galactic longitude between the two sides of the source. The resultant flux density did not change significantly with frequency and had the value 4.5 X 10−23 wm2 (cps)−1. Moreover, the brightness temperature Ts of the center of the source varied inversely as the square of the frequency v; Ts·v2 had the value 3.5X1019 °K sec−2.

The extended radio source in the center of M31

1982 ◽  
Vol 257 ◽  
pp. L13 ◽  
Author(s):  
R. M. Hjellming ◽  
L. L. Smarr
Keyword(s):  
Radio Source ◽  
Extended Radio ◽  
Extended Radio Source
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