Detection of a dark substructure through gravitational imaging

By S. Vegetti, Leon V. E. Koopmans, A. Bolton, T. Treu, R. Gavazzi. 2009

242 citations recorded by the source corpus.

We report the detection of a dark substructure ‐ undetected in the HST-ACS F814W image ‐ in the gravitational lens galaxy SDSSJ0946+1006 (the “Double Einstein Ring”), through direct gravitational imaging. The lens galaxy is of particular int erest because of its relative high inferred fraction of dark matter inside the effective radius. The detection is based on a Bayesian grid reconstruction of the two-dimensional surface density of the galaxy inside an annulus around its Einstein radius. The detection of a small mass concentration in the surface density maps has a strong statistical significance. We confirm this de tection by modeling the substructure with a tidally truncated pseudo-Jaffe density profile; in that case the substructure mass is Msub = (3.51±0.15)×10 9 M⊙, located at (−0.651±0.038, 1.040±0.034)”, precisely where also   

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/361ed0a16c33d794a3cedb9cade51b78e68b6f32

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

Small-Scale Challenges to the ΛCDM Paradigm (2017, methodology): “Vegetti et al. (2010, 2012) have detected two relatively low-mass dark matter subhalos within lensed galaxies using this technique.”
Mining for Dark Matter Substructure: Inferring Subhalo Population Properties from Strong Lenses with Machine Learning (2019, background): “…measurement of positions and ﬂux ratios of multiple images in quasar lenses (Dalal & Kochanek 2002; Hsueh et al. 2019) and lensed images of extended (Vegetti et al. 2010b,a, 2012; Hezaveh et al. 2016b) as well as quasar sources (Fadely & Keeton 2012; Nierenberg et al. 2014, 2017; Gilman et al.…”
Dark matter halo merger histories beyond cold dark matter – I. Methods and application to warm dark matter (2012, background): “…Vegetti & Koopmans C© 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society Downloaded from https://academic.oup.com/mnras/article-abstract/428/2/1774/1010215 by guest on 30 July 2018 2009a,b; Vegetti, Czoske & Koopmans 2010a; Vegetti et al. 2010b, 2012).”
TWO ACCURATE TIME-DELAY DISTANCES FROM STRONG LENSING: IMPLICATIONS FOR COSMOLOGY (2012, background): “Several authors have shown that the spatially extended sources (such as the host galaxy of the AGN in timedelay lenses) can be used to measure the radial slope at the image positions where it matters (e.g., Dye & Warren 2005; Dye et al. 2008; Suyu et al. 2010; Vegetti et al. 2010; Suyu 2012).”
The number and size of subhalo-induced gaps in stellar streams (2016, unknown): “109 M (see e.g. Vegetti et al. 2010, 2012; Hezaveh et al. 2016).”
DETECTION OF LENSING SUBSTRUCTURE USING ALMA OBSERVATIONS OF THE DUSTY GALAXY SDP.81 (2016, methodology): “Vegetti et al. (2014) analyzed a sample of strongly lensed galaxies observed using Hubble Space Telescope (HST) and Keck AO data and found 0.2% < fsub < 2.8%, at 68% confidence, with two detections reported in Vegetti et al. (2010) and Vegetti et al. (2012).”
Gravitational probes of dark matter physics (2017, methodology): “Currently, the best constraints on the substructure mass function come from flux ratio anomalies and gravitational imaging studies [308, 309, 310, 311, 312].”
Not so lumpy after all: modelling the depletion of dark matter subhaloes by Milky Way-like galaxies (2017, background): “This is particularly relevant for searches for dark subhalos via lensing anomalies (e.g. Vegetti et al. 2010; MacLeod et al. 2013; Nierenberg et al. 2014; Hezaveh et al. 2016).”
Inference of the cold dark matter substructure mass function at z = 0.2 using strong gravitational lenses (2014, methodology): “We refer to Vegetti et al. (2010) for a more detailed discussion on this particular lens systems. c© 0000 RAS, MNRAS 000, 000–000”
Galactic Searches for Dark Matter (2012, methodology): “This follows up on the eariler detection of a ∼ 3× 109 M substructure associated with the lens system using a Bayesian reconstruction method (Vegetti et al., 2010).”