CaltechAUTHORS
  A Caltech Library Service

The internal structure of the lens PG1115+080: breaking degeneracies in the value of the Hubble constant

Treu, T. and Koopmans, L. V. E. (2002) The internal structure of the lens PG1115+080: breaking degeneracies in the value of the Hubble constant. Monthly Notices of the Royal Astronomical Society, 337 (2). L6-L10. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20170408-210648496

[img] PDF - Published Version
See Usage Policy.

125Kb
[img] PDF - Accepted Version
See Usage Policy.

144Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20170408-210648496

Abstract

We combine lensing, stellar kinematic and mass-to-light ratio constraints to build a two-component (luminous plus dark) mass model of the early-type lens galaxy in PG1115+080. We find a total mass density profile steeper than r^(−2), effectively ρ ∝r ^(−γ′) with γ′= 2.35 ± 0.1 ± 0.05 (random + systematic). The stellar mass fraction is f*= 0.67^(+0.20) − 0.25 ± 0.03 inside the Einstein radius (R_E ≈ 1.2 effective radii). The dynamical mass model breaks the degeneracies in the mass profile of the lens galaxy and allows us to obtain a value of the Hubble constant that is no longer dominated by systematic errors: H_0= 59_(+12) − 7 ± 3 km s^(−1) Mpc^(−1) (68 per cent confidence level; Ω_m= 0.3, Ω_Λ= 0.7). The offset of PG1115+080 from the Fundamental Plane might indicate deviations from homology of the mass profile of some early-type galaxies.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1046/j.1365-8711.2002.06107.xDOIArticle
https://arxiv.org/abs/astro-ph/0210002arXivDiscussion Paper
Additional Information:© 2002 RAS. Accepted 2002 October 7. Received 2002 September 18; in original form 2002 August 08. We thank E. Agol, G. Bertin, L. Ciotti, R. Ellis, and O. Wucknitz for their comments on this manuscript. Based on observations collected with the NASA/ESA HST, obtained at STScI, which is operated by AURA, under NASA contract NAS5—26555.
Group:TAPIR
Funders:
Funding AgencyGrant Number
NASANAS 5-26555
Subject Keywords:gravitational lensing, galaxies: elliptical and lenticular, cD, galaxies: fundamental parameters, galaxies: kinematics and dynamics, distance scale
Record Number:CaltechAUTHORS:20170408-210648496
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170408-210648496
Official Citation:T. Treu, L. V. E. Koopmans; The internal structure of the lens PG1115+080: breaking degeneracies in the value of the Hubble constant, Monthly Notices of the Royal Astronomical Society, Volume 337, Issue 2, 1 December 2002, Pages L6–L10, https://doi.org/10.1046/j.1365-8711.2002.06107.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76398
Collection:CaltechAUTHORS
Deposited By: 1Science Import
Deposited On:02 Apr 2018 18:06
Last Modified:02 Apr 2018 18:06

Repository Staff Only: item control page