Some Examples of Thermal and Nonthermal Radio Sources

2013 ◽  
pp. 333-391
Author(s):  
Thomas L. Wilson ◽  
Kristen Rohlfs ◽  
Susanne Hüttemeister
Keyword(s):  
Radio Sources ◽  
Nonthermal Radio

scholarly journals The Nature of Flat Spectrum Sources

1996 ◽  
Vol 175 ◽  
pp. 423-426
Author(s):  
D.B. Melrose
Keyword(s):  
Galactic Center ◽  
Basic Mechanism ◽  
Electron Energy Spectrum ◽  
Shock Acceleration ◽  
Radio Sources ◽  
Fermi Acceleration ◽  
Diffusive Shock Acceleration ◽  
Nonthermal Radio ◽  
Pile Up ◽  
Multiple Shocks

Nonthermal radio sources near the Galactic Center with flat or weakly inverted spectra (S((ω) ∝ ωα with α ≳ 0) are attributed to optically thin synchrotron emission from a hard electron energy spectrum, N(ε) ∝ ε–α with a = 1 – 2α ≲ 1, produced by Fermi acceleration or diffusive shock acceleration at multiple shocks combined with a synchrotron pile up. This basic mechanism is also plausible for flat-spectrum AGN.

scholarly journals The Compact Nonthermal Radio Source at the Galactic Center: an Update

1989 ◽  
Vol 136 ◽  
pp. 527-534
Author(s):  
K. Y. Lo
Keyword(s):  
Radio Source ◽  
Galactic Center ◽  
Central Star ◽  
Radio Sources ◽  
Stellar Objects ◽  
Nonthermal Radio ◽  
Compact Radio Source ◽  
The Galaxy ◽  
Observational Status ◽  
Sgr A

We review the current observational status of Sgr A∗, the compact nonthermal radio source at the galactic center. Sgr A∗ is a unique radio source at a unique location of the Galaxy. It is unlike any compact radio source associated with known stellar objects, but it is similar to extragalactic nuclear compact radio sources. The positional offset between Sgr A∗ and IRS16 places little constraint on the nature of the underlying energy source, since IRS16 need not be the core of the central star cluster. Sgr A∗ is still the best candidate for marking the location of a massive collapsed object.

Jets associated with supernova remnants and other galactic nonthermal sources

1986 ◽  
Vol 64 (4) ◽  
pp. 482-483
Author(s):  
R. H. Becker
Keyword(s):  
Black Holes ◽  
Neutron Star ◽  
Supernova Remnants ◽  
Binary Systems ◽  
Radio Sources ◽  
Nonthermal Radio ◽  
Galactic Sources ◽  
Relativistic Particles

Accreting neutron star or black holes in binary systems can, under appropriate circumstances, eject jets of particles into their environment. This is most readily observed in SS433, Sco X-1, and Cyg X-3. We infer the presence of the injection of relativistic particles in a number of other galactic sources where actual jets have not been observed. In some cases the energy imparted results in nonthermal radio sources comparable in size to supernova remnants.

Spectra of Nonthermal Radio Sources.

1963 ◽  
Vol 68 ◽  
pp. 539
Author(s):  
Kenneth I. Kellermann
Keyword(s):  
Radio Sources ◽  
Nonthermal Radio

A new class of nonthermal radio sources

Nature ◽  
1985 ◽  
Vol 313 (5998) ◽  
pp. 115-118 ◽  
Author(s):  
R. H. Becker ◽  
D. J. Helfand
Keyword(s):  
Radio Sources ◽  
New Class ◽  
Nonthermal Radio

scholarly journals 6 cm Observations of Nonthermal Radio Sources Near the Galactic Plane

1969 ◽  
Vol 22 (5) ◽  
pp. 613 ◽  
Author(s):  
DK Milne
Keyword(s):  
Supernova Remnants ◽  
Galactic Plane ◽  
Brightness Distribution ◽  
Radio Sources ◽  
Nonthermal Radio

Brightness distributions and flux densities at 5000 MHz are presented for 17 nonthermal sources (possible supernova remnants) together with their spectra derived from these and other observations. For most sources a comparison has been made between the brightness distribution at 5000 MHz and that obtained with comparable resolution at 408 MHz with the Molonglo 1 mile Cross.

Sign in / Sign up

Export Citation Format

Share Document