A Spectral Index Map from VSOP Observations of Markarian 501

Details A Spectral Index Map from VSOP Observations of Markarian 501 A Spectral Index Map from VSOP Observations of Markarian 501

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52.1015e&link_type=abstract

Publications of the Astronomical Society of Japan, v.52, p.1015-L1019.

Astronomy and Astrophysics

Astronomy

15

Bl Lacertae Objects: Individual (Markarian 501 = 1652+398), Galaxies: Active, Radio Continuum: Galaxies, Techniques: Interferometric

Scientific paper

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.

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