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2011MNRAS.410.2217W - Mon. Not. R. Astron. Soc., 410, 2217-2236 (2011/February-1)
Gas and dark matter in the Sculptor group: NGC 300.
WESTMEIER T., BRAUN R. and KORIBALSKI B.S.
Abstract (from CDS):
NGC 300 is characterized by a dense inner H I disc, well aligned with the optical disc of 290° orientation angle, and an extended outer H I disc with a major axis of more than 1° on the sky (equivalent to a diameter of about 35 kpc) and a different orientation angle of 332°. A significant fraction (about 43 per cent) of the total detected H I mass of 1.5 x 109 M☉ resides within the extended outer disc. We fitted a tilted ring model to the velocity field of NGC 300 to derive the rotation curve out to a radius of 18.4 kpc, almost twice the range of previous rotation curve studies. The rotation curve rises to a maximum velocity of almost 100 km/s and then gently decreases again in the outer disc beyond a radius of about 10 kpc. Mass models fitted to the derived rotation curve yield good fits for Burkert and NFW dark matter halo models, whereas pseudo-isothermal halo models and Modified Newtonian Dynamics (MOND)-based models both struggle to cope with the declining rotation curve.
We also observe significant asymmetries in the outer H I disc of NGC 300, in particular near the edge of the disc, which are possibly due to ram-pressure stripping of gas by the intergalactic medium (IGM) of the Sculptor group. Our estimates show that ram-pressure stripping can occur under reasonable assumptions on the density of the IGM and the relative velocity of NGC 300. The asymmetries in the gas disc suggest a proper motion of NGC 300 towards the south-east. At the same time, our data exclude IGM densities of significantly higher than 10–5/cm3 in the vicinity of NGC 300, as otherwise the outer gas disc would have been stripped. A SINFONI integral field spectroscopy survey for galaxy counterparts to damped Lyman α systems - I. New detections and limits for intervening and associated absorbers
Abstract Copyright: 2010 CSIRO. Journal compilation2010 RAS
Journal keyword(s): galaxies: individual: NGC 300 - galaxies: kinematics and dynamics - galaxies: structure - radio lines: galaxies
Simbad objects: 10
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