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

By T. Treu, Leon V. E. Koopmans. 2002

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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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/f61117778432b0387837551881925a11a946f680

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Citations in the corpus

DISSECTING THE GRAVITATIONAL LENS B1608+656. II. PRECISION MEASUREMENTS OF THE HUBBLE CONSTANT, SPATIAL CURVATURE, AND THE DARK ENERGY EQUATION OF STATE (2009, background): “…likewise, lens galaxy stellar velocity dispersion measurements (e.g., Grogin & Narayan 1996a,b; Tonry & Franx 1999; Koopmans & Treu 2002; Treu & Koopmans 2002; Barnabè & Koopmans 2007; McKean et al. 2009) and analysis of any extended images (e.g., Dye & Warren 2005; Dye et al. 2008)…”
A Determination of H0 with the CLASS Gravitational Lens B1608+656. III. A Significant Improvement in the Precision of the Time Delay Measurements (2002, background): “In addition to the analysis of Einstein ring emission, information about the stellar dynamics of lensing galaxies can place strong constraints on the mass distribution of the lens (Treu & Koopmans 2002; Koopmans & Treu 2002).”
The Sloan Lens ACS Survey. II. Stellar Populations and Internal Structure of Early-Type Lens Galaxies (2005, background): “From the LSD sample of five higher redshift lenses KT found 〈fSIE〉 = 0.87 ± 0.04 with an rms scatter of 0.08 (including non-LSD lenses PG1115+080 and B1608+656 raises the average to 0.95± 0.07, rms 0.17; Treu & Koopmans 2002b; Koopmans et al. 2003).”
H0LiCOW – I. H0 Lenses in COSMOGRAIL's wellspring: program overview (2016, background): “The combination of lensing and stellar kinematics is a powerful probe of the lens galaxy mass distribution (e.g., Romanowsky & Kochanek 1999; Treu & Koopmans 2002; Koopmans et al. 2003; Barnabè et al. 2009, 2011; Sonnenfeld et al. 2012) since the combination breaks degeneracies that are inherent…”
The Evolution and Structure of Early-Type Field Galaxies: A Combined Statistical Analysis of Gravitational Lenses (2004, methodology): “Lett., 5, 42) Padmanabhan, N., et al. 2004, NewA, 9, 329 Pahre, M. A., de Carvalho, R. R., & Djorgovski, S. G. 1998a, AJ, 116, 1606 Pahre, M. A., Djorgovski, S. G., & de Carvalho, R. R. 1998b, AJ, 116, 1591 Patnaik, A. R., Browne, I. W. A., Wilkinson, P. N., & Wrobel, J. M. 1992, MNRAS, 254, 655 Rat”
Gravitational Lens Time Delays: A Statistical Assessment of Lens Model Dependences and Implications for the Global Hubble Constant (2006, background): “Furthermore, the measurement of velocity dispersions of lens galaxies serves as a useful constraint on mass distributions, helping to break degeneracies between mass models (e.g., Treu & Koopmans 2002).”
THE SLOAN LENS ACS SURVEY. X. STELLAR, DYNAMICAL, AND TOTAL MASS CORRELATIONS OF MASSIVE EARLY-TYPE GALAXIES (2010, background): “…mass density slope, such as that inferred from multiply-imaged extended sources (Warren & Dye 2003; Suyu et al. 2006) and from stellar kinematics (Treu & Koopmans 2002; Koopmans et al. 2003), can help to break these degeneracies and provide robust estimates of cosmological parameters (e.g., Suyu…”
Time delay cosmography (2016, methodology): “…et al. 2000; Kochanek et al. 2001; Koopmans et al. 2003; Wucknitz et al. 2004; Suyu et al. 2006), or non-lensing data like the deflector stellar velocity dispersion (Treu and Koopmans 2002b) and the properties of galaxies along the line of sight (Keeton and Zabludoff 2004; Suyu et al. 2010).”
Constraints on the Equation of State of Dark Energy and the Hubble Constant from Stellar Ages and the Cosmic Microwave Background (2003, methodology): “…the joint likelihood analysis of WMAP+2dFGRS+Ly forest power spectrum (h ¼ 0:71þ0:04 0:08; Spergel et al. 2003), with gravitational lens time delay determinations (h ¼ 0:59þ0:12 0:07 0:03; Treu & Koopmans 2002), and Sunyaev-Zeldovich measurements (h ¼ 0:60þ0:04þ0:130:04 0:18 ; Reese et al. 2002).”
Galaxy Masses: A Review (2013, methodology): “…in the previous section, has been successfully applied initially by the Lenses Structure & Dynamics (LSD) survey (e.g. Koopmans & Treu 2002; Treu & Koopmans 2002a,b; Koopmans & Treu 2003; Treu & Koopmans 2004) and more recently by the SLACS survey, the BELLS Survey (Bolton et al. 2012;…”
TDCOSMO IV: Hierarchical time-delay cosmography -- joint inference of the Hubble constant and galaxy density profiles (2020, methodology): “…of the deflector galaxy, σP, can provide a dynamical mass estimate of the deflector independent of the lensing observables and joint lensing and dynamical mass estimates have been used to constrain galaxy mass profiles (Grogin & Narayan 1996; Romanowsky & Kochanek 1999; Treu & Koopmans 2002).”
TDCOSMO. I. An exploration of systematic uncertainties in the inference of $H_0$ from time-delay cosmography (2019, methodology): “The measured stellar kinematics of the lensing galaxy were used to mitigate the impact of well-known lensing degeneracies on the cosmological inference (e.g., Treu & Koopmans 2002).”