The X-Shooter Lens Survey - I. Dark-Matter Domination and a Salpeter-type IMF in a Massive Early-type Galaxy

Details The X-Shooter Lens Survey - I. Dark-Matter Domination and a Salpeter-type IMF in a Massive Early-type Galaxy The X-Shooter Lens Survey - I. Dark-Matter Domination and a Salpeter-type IMF in a Massive Early-type Galaxy

2011-03-24

arxiv.org/abs/1103.4773v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 5 figures, accepted for publication on MNRAS

Scientific paper

We present the first results from the X-shooter Lens Survey (XLENS): an analysis of the massive early-type galaxy SDSS J1148+1930 at redshift z=0.444. We combine its extended kinematic profile -derived from spectra obtained with X-shooter on the ESO VLT- with strong gravitational lensing and multi-color information derived from SDSS images. Our main results are (i) The luminosity-weighted stellar velocity dispersion is \sigma *(= 3 (with dN/dM \propto M^(-{\alpha})) -such as that recently suggested for massive ETGs- are excluded at the > 90 % C.L. and in some cases violate the total lensing-derived mass limit. We conclude that this very massive ETG is dark-matter dominated inside one effective radius, consistent with the trend recently found from massive SLACS galaxies, with a IMF normalization consistent with Salpeter.

Affiliated with

Also associated with

No associations

Rating

The X-Shooter Lens Survey - I. Dark-Matter Domination and a Salpeter-type IMF in a Massive Early-type Galaxy 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 X-Shooter Lens Survey - I. Dark-Matter Domination and a Salpeter-type IMF in a Massive Early-type Galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The X-Shooter Lens Survey - I. Dark-Matter Domination and a Salpeter-type IMF in a Massive Early-type Galaxy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-47778