Radio to optical spectral index variations along the M87 jet

Bibcode
1989Ap&SS.157..183G
DOI
10.1007/BF00637327
Gonzalez-Serrano, J. I.; Perez-Fournon, I.; Junor, W.; Spencer, R.
Bibliographical reference

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Phenomena in Galaxies, Puerto de la Cruz, Spain, July 4-15, 1988) Astrophysics and Space Science (ISSN 0004-640X), vol. 157, no. 1-2, July 1989, p. 183-186.

Advertised on:
7
1989
Number of authors
4
IAC number of authors
0
Citations
6
Refereed citations
6
Description
CCD photometry and MERLIN observations of M87 (Virgo A) have been used to study the variations of the radio to optical spectral index along the jet. In general, the radio spectrum is flatter than the optical one and both become steeper with distance from the nucleus. The optical fluxes of the bright knots lie at or below the extrapolation of the radio spectrum. These properties can be explained by power-law spectra at low frequencies that turn down gradually beyond a cut-off frequency. The location of the local cut-off frequency is estimated by fitting the measured fluxes to the theoretical spectrum of a truncated power-law electron energy distribution. The results are interpreted in terms of models of synchrotron emission from shock waves in extragalactic jets.
Type
Non-refereed
Elliptical galaxies
Extragalactic radio sources

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