The internal dynamics of the Local Group dwarf elliptical galaxies NGC147, NGC185, and NGC205

Details The internal dynamics of the Local Group dwarf elliptical galaxies NGC147, NGC185, and NGC205 The internal dynamics of the Local Group dwarf elliptical galaxies NGC147, NGC185, and NGC205

2006-03-25

arxiv.org/abs/astro-ph/0603700v1

Mon.Not.Roy.Astron.Soc.369:1321-1333,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS, 14 pages, 13 figures

Scientific paper

10.1111/j.1365-2966.2006.10377.x

We present three-integral dynamical models for the three Local Group dwarf elliptical galaxies: NGC147, NGC185, and NGC205. It is the first time models are constructed for the Local Group dEs that allow for the presence of dark matter at large radii and that are constrained by kinematics out to at least one half-light radius. The B-band mass-to-light ratios of all three galaxies are rather similar, (M/L)_B = 3-4. Within the inner two half-light radii, about 40-50% of the mass is in the form of dark matter, so dEs contain about as much dark matter as bright ellipticals. NGC205 and NGC147 have a relatively isotropic velocity dispersion tensor within the region where the internal dynamics are strongly constrained by the data. Our estimated inclination for NGC185 is i ~ 50 degrees because in that case the model has an intrinsic flattening close to the peak of the intrinsic shape distribution of dEs and it, like the best fitting models for NGC147 and NGC205, is nearly isotropic. We also show that the dynamical properties of the bright nucleus of NGC205 are not unlike those of a massive globular cluster.

Affiliated with

Also associated with

No associations

Rating

The internal dynamics of the Local Group dwarf elliptical galaxies NGC147, NGC185, and NGC205 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The internal dynamics of the Local Group dwarf elliptical galaxies NGC147, NGC185, and NGC205, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The internal dynamics of the Local Group dwarf elliptical galaxies NGC147, NGC185, and NGC205 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-434274