Internal structure and dynamics of the kiloparsec-scale jet in M87

Details Internal structure and dynamics of the kiloparsec-scale jet in M87 Internal structure and dynamics of the kiloparsec-scale jet in M87

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003newar..47..629l&link_type=abstract

New Astronomy Reviews, Volume 47, Issue 6-7, p. 629-632.

Astronomy and Astrophysics

Astronomy

25

Scientific paper

Detailed analysis of HST and VLA observations enables quantitative modeling of the internal structure of the kiloparsec-scale jet in M87. The jet transverse profiles can be modeled by double-Gaussian profiles. The jet structure is dominated by two threads resembling closely a double helix visible until about 20'' distance. It is produced by a combination of the helical mode and of the elliptical mode of Kelvin-Helmholtz instability. The elliptical mode dominates the pre-knot A jet, while the helical mode becomes prominent at larger distances. Modeling the jet structure constrains well the instability pattern speed, βw=0.5c and jet viewing angle, θj=40°. The estimated bulk Lorentz factor of the jet is 3.4. The model reproduces the jet structure on scales of up to 50'' (accounting for the jet curvature).

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