scholarly journals Evidence of a Weak Galactic Center Magnetic Field from Diffuse Low-Frequency Nonthermal Radio Emission

2005 ◽  
Vol 626 (1) ◽  
pp. L23-L27 ◽  
Author(s):  
T. N. LaRosa ◽  
C. L. Brogan ◽  
S. N. Shore ◽  
T. J. Lazio ◽  
N. E. Kassim ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Radio Emission ◽  
Galactic Center ◽  
Low Frequency ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals Global Dynamics of the Interstellar Gas, Magnetic Field, and Cosmic Rays

1978 ◽  
Vol 77 ◽  
pp. 57-65
Author(s):  
E. H. Levy
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Radio Emission ◽  
Composite System ◽  
Global Dynamics ◽  
Interstellar Gas ◽  
Dynamical Equilibrium ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission ◽  
Physical Principles

I have been asked to review the physical principles which underlie the dynamical equilibrium and stability of a composite system of gas, magnetic field, and cosmic rays. What is of particular concern here are those aspects which control the distribution of magnetic field and cosmic rays, and thus influence the morphology of galaxies as seen in nonthermal radio emission.

Nonthermal radio emission from the galactic center arc

1986 ◽  
Vol 310 ◽  
pp. 689 ◽  
Author(s):  
F. Yusef-Zadeh ◽  
Mark Morris ◽  
O. B. Slee ◽  
G. J. Nelson
Keyword(s):  
Radio Emission ◽  
Galactic Center ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

Nonthermal radio emission of the galactic center

Astrophysics ◽  
1985 ◽  
Vol 22 (2) ◽  
pp. 176-181
Author(s):  
Ch. N. Seitnepesov ◽  
A. Kh. Khanberdiev
Keyword(s):  
Radio Emission ◽  
Galactic Center ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals Turbulent Origin of the Galactic Center Magnetic Field: Nonthermal Radio Filaments

2006 ◽  
Vol 637 (2) ◽  
pp. L101-L104 ◽  
Author(s):  
Stanislav Boldyrev ◽  
Farhad Yusef-Zadeh
Keyword(s):  
Magnetic Field ◽  
Galactic Center ◽  
Nonthermal Radio

Detection of Nonthermal Radio Emission from Coronal X-Ray Jets

1995 ◽  
Vol 447 (2) ◽  
Author(s):  
M. R. Kundu, ◽  
J. P. Raulin, ◽  
N. Nitta, ◽  
H. S. Hudson, ◽  
M. Shimojo, ◽  
...  
Keyword(s):  
Radio Emission ◽  
X Ray ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission

scholarly journals Magnetic annihilation in colliding-wind binary systems

1995 ◽  
Vol 163 ◽  
pp. 523-524
Author(s):  
M. Jardine ◽  
H.R. Allen ◽  
A.M.T. Pollock
Keyword(s):  
Particle Acceleration ◽  
Radio Emission ◽  
Magnetic Reconnection ◽  
Stagnation Point ◽  
Binary Systems ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission ◽  
Reconnection Model

We investigate the possibility that a stagnation-point magnetic reconnection model may account for the particle acceleration necessary for the generation of nonthermal radio emission in the Wolf-Rayet binary systems exemplified by WR140.

scholarly journals G51.04+0.07 and its environment: Identification of a new Galactic supernova remnant at low radio frequencies

2018 ◽  
Vol 616 ◽  
pp. A98 ◽  
Author(s):  
L. Supan ◽  
G. Castelletti ◽  
W. M. Peters ◽  
N. E. Kassim
Keyword(s):  
Radio Emission ◽  
Flux Density ◽  
Supernova Remnant ◽  
Low Frequency ◽  
Neutral Hydrogen ◽  
Radio Continuum ◽  
Very Large Array ◽  
Continuum Spectrum ◽  
Galactic Emission ◽  
Nonthermal Radio Emission

We have identified a new supernova remnant (SNR), G51.04+0.07, using observations at 74 MHz from the Very Large Array Low-Frequency Sky Survey Redux (VLSSr). Earlier, higher frequency radio continuum, recombination line, and infrared data had correctly inferred the presence of nonthermal radio emission within a larger, complex environment including ionised nebulae and active star formation. However, our observations have allowed us to redefine at least one SNR as a relatively small source (7.′5 × 3′in size) located at the southern periphery of the originally defined SNR candidate G51.21+0.11. The integrated flux density of G51.04+0.07 at 74 MHz is 6.1 ± 0.8 Jy, while its radio continuum spectrum has a slope α = −0.52 ± 0.05 (S v ∝ vα), typical of a shell-type remnant. We also measured spatial variations in the spectral index between 74 and 1400 MHz across the source, ranging from a steeper spectrum (α = −0.50 ± 0.04) coincident with the brightest emission to a flatter component (α = −0.30 ± 0.07) in the surrounding fainter region. To probe the interstellar medium into which the redefined SNR is likely evolving, we have analysed the surrounding atomic and molecular gas using the 21 cm neutral hydrogen (HI) and 13CO(J = 1 − 0) emissions. We found that G51.04+0.07 is confined within an elongated HI cavity and that its radio emission is consistent with the remains of a stellar explosion that occurred ~6300 yr ago at a distance of 7.7 ± 2.3 kpc. Kinematic data suggest that the newly discovered SNR lies in front of HII regions in the complex, consistent with the lack of a turnover in the low frequency continuum spectrum. The CO observations revealed molecular material that traces the central and northern parts of G51.04+0.07. The interaction between the cloud and the radio source is not conclusive and motivates further study. The relatively low flux density (~1.5 Jy at 1400 MHz) of G51.04+0.07 is consistent with this and many similar SNRs lying hidden along complex lines of sight towards inner Galactic emission complexes. It would also not be surprising if the larger complex studied here hosted additional SNRs.

scholarly journals Voyager Detection of Nonthermal Radio Emission from Saturn

Science ◽  
1980 ◽  
Vol 209 (4462) ◽  
pp. 1238-1240 ◽  
Author(s):  
M. L. KAISER ◽  
M. D. DESCH ◽  
J. W. WARWICK ◽  
J. B. PEARCE
Keyword(s):  
Radio Emission ◽  
Nonthermal Radio ◽  
Nonthermal Radio Emission
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