A spectral index map from VSOP observations of Markarian 501

被引：23

作者：

Edwards, PG

Giovannini, G

Cotton, WD

Feretti, L

Fujisawa, K

Hirabayashi, H

Lara, L

Venturi, T

机构：

[1] Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[2] Ist Radioastron, I-40129 Bologna, Italy

[3] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[4] Natl Astron Observ, Mitaka, Tokyo 1818588, Japan

[5] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2000年 / 52卷 / 06期

关键词：

BL Lacertae objects : individual (Markarian 501=1652+398); galaxies : active; radio continuum : galaxies; techniques : interferometric;

D O I：

10.1093/pasj/52.6.1015

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1015 / 1019

页数：5

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