Multi-frequency radio spectral studies of the supernova remnant G 78.2+2.1.

Details Multi-frequency radio spectral studies of the supernova remnant G 78.2+2.1. Multi-frequency radio spectral studies of the supernova remnant G 78.2+2.1.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324..641z&link_type=abstract

Astronomy and Astrophysics, v.324, p.641-650

Astronomy and Astrophysics

Astrophysics

21

Ism: Supernova Remnants, Ism: Individual Objects: G78.2+2.1 (Snr 078.2+02.1)

Scientific paper

A new map of the SNR G78.2+2.1 at 232 MHz is presented. This map is used with other images at 408, 1420, 2695 and 4800 MHz to investigate the total spectral index of the SNR and the variation of spectral index across it. The integrated spectral index is α=0.54 +/-0.02 (where Snu_{prop.to}ν^-α^). Maps of the spectral-index variation across the source are derived using a method which calculates a differential spectral index. This method is independent of offset errors and large-scale background variations. Systematic spectral-index variations of ~+/-0.15 are found, consistently in the many independent pairs of data sets. Regions of higher spectral index (steeper spectra) appear around the periphery of the remnant and in its central area. Regions of lower spectral index (flatter spectra) are also found within the remnant. The latter may result from a change in the nature of the non-thermal emission or may represent "contamination" from underlying patches of thermal emission. There is no clear correlation of spectral index with intensity across the SNR. Theoretical reasons for spectral-index variations have been explored but no clear interpretation of the apparent spectral steepening near the shock front has been found nor has an explanation of the steep-spectrum central region.

Affiliated with

Also associated with

No associations

Rating

Multi-frequency radio spectral studies of the supernova remnant G 78.2+2.1. 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 Multi-frequency radio spectral studies of the supernova remnant G 78.2+2.1., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-frequency radio spectral studies of the supernova remnant G 78.2+2.1. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1877648