C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST21:05:06

2010A&A...524A..94S - Astronomy and Astrophysics, volume 524, A94-94 (2010/12-1)

The halos of satellite galaxies: the companion of the massive elliptical lens SL2S J08544-0121.


Abstract (from CDS):

Strong gravitational lensing by groups or clusters of galaxies provides a powerful technique to measure the dark matter properties of individual lens galaxies. We study in detail the mass distribution of the satellite lens galaxy in the group-scale lens SL2S J08544-0121 by modelling simultaneously the spatially extended surface brightness distribution of the source galaxy and the lens mass distribution using Markov chain Monte Carlo methods. In particular, we measure the dark matter halo size of the satellite lens galaxy to be 6.0+2.9–2.0kpc with a fiducial velocity dispersion of 127+21–12km/s. This is the first time the size of an individual galaxy halo in a galaxy group has been measured using strong gravitational lensing without assumptions of mass following light. We verify the robustness of our halo size measurement using mock data resembling our lens system. Our measurement of the halo size is compatible with the estimated tidal radius of the satellite galaxy, suggesting that halos of galaxies in groups experience significant tidal stripping, a process that has been previously observed on galaxies in clusters. Our mass model of the satellite galaxy is elliptical with its major axis misaligned with that of the light by ∼50°. The major axis of the total matter distribution is oriented more towards the centre of the host halo, exhibiting the radial alignment found in N-body simulations and observational studies of satellite galaxies. This misalignment between mass and light poses a significant challenge to modified Newtonian dynamics.

Abstract Copyright:

Journal keyword(s): galaxies: halos - galaxies: groups: individual: SL2SJ08544-0121 - gravitational lensing: strong - methods: data analysis

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 610 1
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 654 0
3 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 232 0
4 GAMA 3882191 G 08 54 46.550 -01 21 37.08           ~ 16 0
5 SDSS J120602.09+514229.5 G 12 06 02.09 +51 42 29.5     18.97     ~ 14 0
6 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1043 0

    Equat.    Gal    SGal    Ecl

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