Authors:
Edwards, Philip G.;Giovannini, Gabriele;Cotton, William D.;Feretti, Luigina;Fujisawa, Kenta;Hirabayashi, Hisashi;Lara, Lucas;Venturi, Tiziana
Journal:
Publications of the Astronomical Society of Japan
Abstract:
One of the features of VSOP observations is the ability to make contemporaneous, matched-resolution images at different frequencies in order to produce spectral index maps. We have combined VSOP observations made at 4.8 GHz on 1998 April 7 and 1.6 GHz on 1998 April 8 to make such a map of the variable X-ray and TeV gamma-ray source Mkn 501. The spectral index map reveals considerably more information than a single frequency total intensity image, and shows significant spectral variation along and across the milli-arcsecond scale jet. We interpret this in terms of models for the jet involving an inner fast spine and slower outer shear layer.
URL:
https://ui.adsabs.harvard.edu/#abs/2000PASJ...52.1015E/abstract
Keywords:
BL LACERTAE OBJECTS: INDIVIDUAL (MARKARIAN 501 = 1652+398);GALAXIES: ACTIVE;RADIO CONTINUUM: GALAXIES;TECHNIQUES: INTERFEROMETRIC