Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-04
Astronomy and Astrophysics
Astrophysics
11 pages, 9 figures, submitted to MNRAS
Scientific paper
We present Subaru spectroscopy of the early-type lensing galaxies in the lens systems HST14113+5211 (z=0.464) and B2045+265 (z=0.868), being aimed at measuring the velocity dispersion of the lensing galaxies as an important component to their mass distributions and internal dynamics. For HST14113+5211 we have obtained 174+/-20km/s (1-sigma) inside an aperture of 0.9", and for B2045+265 we have obtained 213+/-23km/s inside an aperture of 1.2". To extract the significance of these information on the mass distributions and stellar dynamics of the lensing galaxies, we construct two alternative models for both the mass and velocity distributions. It is found that the mass-to-light ratios as derived from a joint lensing and stellar dynamics analysis are virtually consistent with those obtained from the use of the Fundamental Plane. Also, for HST14113+5211, we find that the total mass distribution is well reproduced by a power-law density profile with an index of 2, thereby suggesting that a singular isothermal model is a good fit to the lensing galaxy. In contrast, the corresponding slope for B2045+265 is flatter than isothermal, suggesting that additional contributions to lensing mass from surrounding structures (possibly the group of galaxies) provide the observed angular separations of multiple images.
Chiba Masashi
Hamana Takashi
Kashikawa Nobunari
Ohyama Youichi
No associations
LandOfFree
Dark and stellar matter in strong lensing galaxies from a joint lensing and stellar dynamics 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 Dark and stellar matter in strong lensing galaxies from a joint lensing and stellar dynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark and stellar matter in strong lensing galaxies from a joint lensing and stellar dynamics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-466903