Dark Matter Fraction in Lens Galaxies: New Estimates from Microlensing

Abstract

We present a joint estimate of the stellar/dark matter mass fraction in lens galaxies and the average size of the accretion disk of lensed quasars from microlensing measurements of 27 quasar image pairs seen through 19 lens galaxies. The Bayesian estimate for the fraction of the surface mass density in the form of stars is $\alpha =0.21\pm 0.14$ near the Einstein radius of the lenses ($\sim 1-2$ effective radii). The estimate for the average accretion disk size is $R_{1/2}=7.9^{+3.8}_{-2.6}\sqrt{M/0.3M_\sun}$ light days. The fraction of mass in stars at these radii is significantly larger than previous estimates from microlensing studies assuming quasars were point-like. The corresponding local dark matter fraction of 79\% is in good agreement with other estimates based on strong lensing or kinematics. The size of the accretion disk inferred in the present study is slightly larger than previous estimates.

15 pages, 2 figures, 1 Table. Replaced with version accepted for publication in The ApJ

References in corpus (7)

• Galaxy Masses
• Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
• X-Ray and Optical Microlensing in the Lensed Quasar PG 1115+080
• The stellar and dark matter distributions in elliptical galaxies from the ensemble of strong gravitational lenses
• The Baryon Fractions and Mass-to-Light Ratios of Early-Type Galaxies
• A calibration of the stellar mass fundamental plane at z ~ 0.5 using the micro-lensing induced flux ratio anomalies of macro-lensed quasars
• The Average Size and Temperature Profile of Quasar Accretion Disks

Cited by in corpus (39)

• The Dark Energy Survey: more than dark energy - an overview
• The fraction of dark matter within galaxies from the IllustrisTNG simulations
• Gravitationally Lensed Quasars in Gaia: II. Discovery of 24 Lensed Quasars
• Limits on the Mass and Abundance of Primordial Black Holes from Quasar Gravitational Microlensing
• The signature of primordial black holes in the dark matter halos of galaxies
• Discovery of two gravitationally lensed quasars in the Dark Energy Survey
• Gravitationally Lensed Quasars in Gaia: I. Resolving Small-Separation Lenses
• First lensed quasar systems from the VST-ATLAS survey: one quad, two doubles and two pairs of lensless twins
• Probing the Broad Line Region and the Accretion Disk in the Lensed Quasars HE0435-1223, WFI2033-4723, and HE2149-2745 using Gravitational Microlensing
• Total density profile of massive early-type galaxies in Horizon-AGN simulation: impact of AGN feedback and comparison with observations
• HOLISMOKES -- III. Achromatic Phase of Strongly Lensed Type Ia Supernovae
• HST imaging of four gravitationally lensed quasars
• Size of the accretion disk in the gravitationally lensed quasar SDSS J1004+4112 from the statistics of microlensing magnifications
• SDSS-IV MaNGA: The Spectroscopic Discovery of Strongly Lensed Galaxies
• New evidence for a cosmological distribution of stellar mass primordial black holes
• Fast Multipole Method for Gravitational Lensing. Application to High Magnification Quasar Microlensing
• The Initial Mass Function of Lens Galaxies from Quasar Microlensing
• VLA and ALMA observations of the lensed radio-quiet quasar SDSS J0924+0219: a molecular structure in a 3 microJy radio source
• Estimate of the Accretion Disk Size in the Gravitationally Lensed Quasar HE 0435-1223 using Microlensing Magnification Statistics
• Revealing the structure of the lensed quasar Q 0957+561: I. Accretion disk size
• A Gravitationally Lensed Quasar Discovered in OGLE
• Evidence for two spatially separated UV continuum emitting regions in the Cloverleaf broad absorption line quasar
• Microlensing Analysis for the gravitational lens systems SDSS0924+0219, Q1355-2257, and SDSS1029+2623
• Constraining the geometry and kinematics of the quasar broad emission line region using gravitational microlensing. II. Comparing models with observations in the lensed quasar HE0435-1223
• Peculiar Transverse Velocities of Galaxies from Quasar Microlensing. Tentative Estimate of the Peculiar Velocity Dispersion at $z\sim 0.5$
• Diffuse emission in microlensed quasars and its implications for accretion-disk physics
• Probing compact dark matter objects with microlensing in gravitationally lensed quasars
• The Impact of the Mass Spectrum of Lenses in Quasar Microlensing Studies. Constraints on a Mixed Population of Primordial Black Holes and Stars
• Revealing the structure of the lensed quasar Q 0957+561 III. Constraints on the size of the broad-line region
• Revealing the nonlinear behaviour of the lensed quasar Q0957+561
• A joint microlensing analysis of lensing mass and accretion disc models
• Another Quadruply Lensed Quasar from the VST-ATLAS Survey
• Abundance of LIGO/Virgo Black Holes from Microlensing Observations of Quasars with Reverberation Mapping Size Estimates
• The Effect of Microlensing On the Observed X-ray Energy Spectra of Gravitationally Lensed Quasars
• Limiting the Abundance of LIGO/Virgo Black Holes with Microlensing Observations of Quasars of Finite Size
• Detection of millimeter-wave coronal emission in a quasar at cosmological distance using microlensing
• Size and kinematics of the CIV broad emission line region from microlensing-induced line profile distortions in two gravitationally lensed quasars
• Cosmological nanolensing by dense gas clouds
• SDSS-IV MaNGA: A Catalogue of Spectroscopically Detected Strong Galaxy-Galaxy Lens Candidates