The Northern Tip of the Magellanic Stream

Details The Northern Tip of the Magellanic Stream The Northern Tip of the Magellanic Stream

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713415b&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #134.15; Bulletin of the American Astronomical Society, Vol. 33, p.722

Astronomy and Astrophysics

Astronomy

Scientific paper

We have mapped in neutral hydrogen (HI) two regions at the northern tip of the Magellanic Stream, known as MS V and MS VI, using the Arecibo telescope. The MS V region is located almost 80 degrees away from the Stream's head near the Magellanic Clouds, and shows a strong ridge of gas. Along its whole extent we find a bifurcation in velocity of approximately 25 km s-1. This suggests presence of two parallel sheets of gas, which meet together in several places by horseshoe-like features. The MS VI region, located ~85 degrees away from the Stream's head, has a clumpy morphology. One of the clumps in this region shows a velocity gradient in the position-velocity slices, reminiscent of rotation curves seen in many galaxies. Additionally, we determine the spatial power spectrum of the HI column density distribution in the MS VI region. The power spectrum can be fitted by a power-law, having slope of -3.7, reminiscent of a Kolmogorov fluid turbulence model. This fit indicates that there is a hierarchy of structure in the Stream. While this hierarchy has also been observed in the Milky Way and the Small Magellanic Cloud, it has generally been ascribed to interstellar turbulence. As there is no sign of star formation in the Magellanic Stream, the source of this hierarchy is still a mystery.

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