C.D.S. - SIMBAD4 rel 1.7 - 2020.04.01CEST14:38:28

2019A&A...631A..40S - Astronomy and Astrophysics, volume 631A, 40-40 (2019/11-1)

Inner dark matter distribution of the Cosmic Horseshoe (J1148+1930) with gravitational lensing and dynamics.


Abstract (from CDS):

We present a detailed analysis of the inner mass structure of the Cosmic Horseshoe (J1148+1930) strong gravitational lens system observed with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3). In addition to the spectacular Einstein ring, this systems shows a radial arc. We obtained the redshift of the radial arc counterimage zs,r=1.961±0.001 from Gemini observations. To disentangle the dark and luminous matter, we considered three different profiles for the dark matter (DM) distribution: a power law profile, the Navarro, Frenk, and White (NFW) profile, and a generalized version of the NFW profile. For the luminous matter distribution, we based the model on the observed light distribution that is fitted with three components: a point mass for the central light component resembling an active galactic nucleus, and the remaining two extended light components scaled by a constant mass-to-light ratio (M/L). To constrain the model further, we included published velocity dispersion measurements of the lens galaxy and performed a self-consistent lensing and axisymmetric Jeans dynamical modeling. Our model fits well to the observations including the radial arc, independent of the DM profile. Depending on the DM profile, we get a DM fraction between 60% and 70%. With our composite mass model we find that the radial arc helps to constrain the inner DM distribution of the Cosmic Horseshoe independently of the DM profile.

Abstract Copyright: © S. Schuldt et al. 2019

Journal keyword(s): gravitational lensing: strong - dark matter - Galaxy: structure - Galaxy: kinematics and dynamics - Galaxy: halo

VizieR on-line data: <Available at CDS (J/A+A/631/A40): list.dat fits/*>

Status at CDS:  

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NAME Cosmic Horseshoe G 11 48 33.10 +19 30 03.2           ~ 64 0
2 [RRB2014] RM J114847.5+193115.1 ClG 11 48 47.5 +19 31 15           ~ 2 0

    Equat.    Gal    SGal    Ecl

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