Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.149s&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
We study the structure of the cooling envelope of an underdense supersonic jet propagating into the rotating Narrow Line Region (NLR) of Seyfert galaxies. We find that the variable rotation speed (we assume solid body rotation) strongly changes the structure of the cooling jet envelope as compared to the case without rotation, which has been studied previously. As can be expected, the envelope is bent in direction of the rotation of the galaxy and compression is higher on the upstream side. There is however a strong difference to the case of a high density which has been studied by Lim and Raga (1998). In the high density case, the jet itself is bent according to ram-pressure balance. However, the extended cocoon around the light jet serves as a protective shield and the jet does not bend significantly since pressure gradients in the hot cocoon are rather small. This is true until it directly hits the dense cold envelope. At this point it is reflected and a large bulge developes in the envelope. This region is significantly brighter than the other sections of the envelope. Increased radio emission is also expected from the strong shock in the jet in the reflection region leading to an association between a regions of strong optical and radio emission. Due to this complex structure simple ram-pressure arguments cannot be applied to explain the path of the light jet in the rotating interstellar medium.
Lim Adrian
Steffen Will
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