The distribution of thermal and nonthermal radio continuum emission of M31

Details The distribution of thermal and nonthermal radio continuum emission of M31 The distribution of thermal and nonthermal radio continuum emission of M31

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...105..192b&link_type=abstract

Astronomy and Astrophysics, vol. 105, no. 1, Jan. 1982, p. 192-199.

Astronomy and Astrophysics

Astrophysics

48

Andromeda Galaxy, Brightness Distribution, Continuous Spectra, Emission Spectra, Nebulae, Nonthermal Radiation, Radio Spectra, Astronomical Maps, Brightness Temperature, Cosmic Rays, Electron Density (Concentration), Galactic Structure, Interstellar Magnetic Fields, Radiant Flux Density, Spiral Galaxies, Synchrotron Radiation, Thermal Emission

Scientific paper

The distribution of the brightness temperature spectral index in the Andromeda Nebula is determined from radio continuum maps at 408 and 2700 MHz. The spectrum is flattest in the 'ring' of intense emission (between 7 and 12 kpc from the center) which is made up of several spiral arm segments. The variations of the spectral index of the total emission inside the 'ring' can be completely explained by variations of the thermal component while the spectral index betan of the nonthermal emission remains almost constant at a value of 2.88 + or - 0.05. Beyond a radius of 12 kpc, betan increases to about 3.0; this is interpreted as an energy loss of the electrons diffusing out of the 'ring.' It is found that the distributions of the thermal and nonthermal radio continuum emission are similar but that both differ from the distribution of the blue light which follows the total population of the disk stars. In the case of equipartition between cosmic ray and magnetic field energy densities, the cosmic ray electrons may originate in sources whose distribution is similar to that of the total stellar population.

Affiliated with

Also associated with

No associations

Rating

The distribution of thermal and nonthermal radio continuum emission of M31 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The distribution of thermal and nonthermal radio continuum emission of M31, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The distribution of thermal and nonthermal radio continuum emission of M31 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1455039