Evidence of a counterrotating core in the Large Magellanic Cloud

Details Evidence of a counterrotating core in the Large Magellanic Cloud Evidence of a counterrotating core in the Large Magellanic Cloud

2005-03-29

arxiv.org/abs/astro-ph/0503606v1

Astrophys.J. 625 (2005) L47-L50

Astronomy and Astrophysics

Astrophysics

12 pages including 3 figures, to appear in ApJ Letters

Scientific paper

10.1086/430761

Stellar radial velocity in the central region of the Large Magellanic Cloud (LMC) is used to estimate the radial velocity curve along various position angles (PA) including the line of nodes (LON). The central part of the radial velocity profile, along the LON, shows a V-shaped profile - a clear indication of counterrotation. The counterrotating region and the secondary bar have similar location and PA. The origin of the counter-rotating core could be internal(secondary bar) or external(accretion). To explain the observed velocity profile, we propose the existence of two disks in the inner LMC, with one counterrotating. This two disk model is found to match the HI velocities as well. Two disks with different LON and velocity profiles can create regions which are kinematically and spatially separated. Predicted such locations are found to match the observed locations where the HI clouds are found to have two velocities.

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