The Dark-Matter Fraction in the Elliptical Galaxy Lensing the Quasar PG1115+080

Abstract

We determine the most likely dark-matter fraction in the elliptical galaxy quadruply lensing the quasar PG1115+080 based on analyses of the X-ray fluxes of the individual images in 2000 and 2008. Between the two epochs, the A2 image of PG1115+080 brightened relative to the other images by a factor of six in X-rays. We argue that the A2 image had been highly demagnified in 2000 by stellar microlensing in the intervening galaxy and has recently crossed a caustic, thereby creating a new pair of micro-images and brightening in the process. Over the same period, the A2 image has brightened by a factor of only 1.2 in the optical. The most likely ratio of smooth material (dark matter) to clumpy material (stars) in the lensing galaxy to explain the observations is ~90% of the matter in a smooth dark-matter component and ~10% in stars.

7 pages, 9 figures, submitted to ApJ

References in corpus (7)

• The Sloan Lens ACS Survey. VII. Elliptical Galaxy Scaling Laws from Direct Observational Mass Measurements
• X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars: I. Zooming in on Quasar Emission Regions
• The Spatial Structure of An Accretion Disk
• X-Ray and Optical Microlensing in the Lensed Quasar PG 1115+080
• The multiple quasar Q2237+0305 under a microlensing caustic
• Gravitational Microlensing
• A Strong X-Ray Flux Ratio Anomaly in the Quadruply Lensed Quasar PG 1115+080

Cited by in corpus (48)

• Did LIGO detect dark matter?
• Strong Lensing by Galaxies
• The Quasar Accretion Disk Size - Black Hole Mass Relation
• The Quasar Accretion Disk Size -- Black Hole Mass Relation
• The dark matter of gravitational lensing
• Lensing of Fast Radio Bursts as a Probe of Compact Dark Matter
• Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
• Microlensing-Based Estimate of the Mass Fraction in Compact Objects in Lens
• The Microlensing Properties of a Sample of 87 Lensed Quasars
• Microlensing of the broad line region in 17 lensed quasars
• Orbital eccentricities in primordial black holes binaries
• The stellar and dark matter distributions in elliptical galaxies from the ensemble of strong gravitational lenses
• A Robust Determination of the size of quasar accretion disks using gravitational microlensing
• Microlensing of Quasar Broad Emission Lines: Constraints on Broad Line Region Size
• Dark Matter Fraction in Lens Galaxies: New Estimates from Microlensing
• Chandra Observations of a 1.9 kpc Separation Double X-ray Source in a Candidate Dual AGN Galaxy at z=0.16
• The Transverse Peculiar Velocity of the Q2237+0305 Lens Galaxy and the Mean Mass of Its Stars
• The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2016 follow-up campaign. I. Overview and classification of candidates selected by two techniques
• X-Ray And Optical Flux Ratio Anomalies In Quadruply Lensed Quasars. II. Mapping the Dark Matter Content in Elliptical Galaxies
• A Study of Gravitational Lens Chromaticity using Ground-based Narrow Band Photometry
• Measuring Microlensing using Spectra of Multiply Lensed Quasars
• Computational advances in gravitational microlensing: a comparison of CPU, GPU, and parallel, large data codes
• Lensing of Fast Radio Bursts by Binaries to Probe Compact Dark Matter
• Spatially Offset Active Galactic Nuclei I: Selection and Spectroscopic Properties
• Dissipational versus Dissipationless Galaxy Formation and the Dark Matter Content of Galaxies
• A microlensing measurement of dark matter fractions in three lensing galaxies
• A Study of Gravitational Lens Chromaticity with the Hubble Space Telescope
• Gaia GraL: Gaia DR2 Gravitational Lens Systems. VI. Spectroscopic Confirmation and Modeling of Quadruply-Imaged Lensed Quasars
• Constraints on compact dark matter with fast radio burst observations
• Probing the Broad Line Region and the Accretion Disk in the Lensed Quasars HE0435-1223, WFI2033-4723, and HE2149-2745 using Gravitational Microlensing
• Probing compact dark matter with gravitational wave fringes detected by the Einstein Telescope
• A New Microlensing Event in the Doubly-Imaged Quasar Q0957+561
• The Effect of a Time-Varying Accretion Disk Size on Quasar Microlensing Light Curves
• Microlensing of Quasar UV Iron Emission
• Gravitational Microlensing: A parallel, large-data implementation
• Microlensing Constraints on Broad Absorption and Emission Line Flows in the Quasar H1413+117
• A Gravitationally Lensed Quasar Discovered in OGLE
• Gravitational Nanolensing from Subsolar Mass Dark Matter Halos
• Microlensing Analysis for the gravitational lens systems SDSS0924+0219, Q1355-2257, and SDSS1029+2623
• Identifying lensed quasars and measuring their time-delays from unresolved light curves
• Discovering Strongly-lensed QSOs From Unresolved Light Curves
• X-ray microlensing in the quadruply lensed quasar Q2237+0305
• PG 1115+080: variations of the A2/A1 flux ratio and new values of the time delays
• A GPU-Enabled, High-Resolution Cosmological Microlensing Parameter Survey
• Optical design of diffraction-limited X-ray telescopes
• The Advanced X-ray Imaging Satellite
• Probing planetary mass dark matter in galaxies: gravitational nanolensing of multiply imaged quasars
• AXIS: A Probe Class Next Generation High Angular Resolution X-ray Imaging Satellite