The halos of satellite galaxies: the companion of the massive elliptical lens SL2S J08544−0121

Suyu, S. H.; Halkola, A.

doi:10.1051/0004-6361/201015481

Cited by 183 publications

(203 citation statements)

References 68 publications

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“…However, we also have the constraint that the projected separation is r p , which yields a distribution of r s that goes as r (r/r p ) 2 − 1 −1 (ref. 37). As M sub ∝ r s , this implies the same functional form for the posterior probability of M sub , neglecting the very small uncertainty on b sub ; this posterior inference on M sub is shown in Fig.…”

Section: Systematic Error On the Substructure Massmentioning

confidence: 75%

Gravitational detection of a low-mass dark satellite galaxy at cosmological distance

Vegetti

Lagattuta

McKean

et al. 2012

Nature

363

392

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The mass-function of dwarf satellite galaxies that are observed around Local Group galaxies substantially differs from simulations 1-5 based on cold dark matter: the simulations predict many more dwarf galaxies than are seen. The Local Group, however, may be anomalous in this regard 6, 7 . A massive dark satellite in an early-type lens galaxy at z = 0.222 was recently found 8 using a new method based on gravitational lensing 9, 10 , suggesting that the mass fraction contained in substructure could be higher than is predicted from simulations. The lack of very low mass detections, however, prohibited any constraint on their mass function. Here we report the presence of a 1.9 ± 0.1 × 10 8 M ⊙ dark satellite in the Einstein-ring system JVAS B1938+666 (ref. 11) at z = 0.881, where M ⊙ denotes solar mass. This satellite galaxy has a mass similar to the Sagittarius 12 galaxy, which is a satellite of the Milky Way. We determine the logarithmic slope of the mass function for substructure beyond the local Universe to be α = 1.1 +0.6 −0.4 , with an average mass-fraction of f = 3.3 +3.6 −1.8 %, by combining data on both of these recently discovered galaxies. Our results are consistent with the predictions from cold dark matter simulations 13-15 at the 95 per cent confidence level,and therefore agree with the view that galaxies formed hierarchically in a Universe composed of cold dark matter.The gravitational lens system JVAS B1938+666 (ref. 11) has a bright infrared background galaxy at redshift 2.059 (ref. 16), which is gravitationally lensed into an almost complete Einstein ring of diameter ∼ 0.9 arcseconds by a massive elliptical galaxy at redshift 0. 881 (ref. 17). The bright, highly-magnified Einstein ring made this system an excellent candidate in which to to search for surface brightness anomalies caused by very low mass (dark matter) substructure in the halo around the high redshift elliptical lens galaxy. The presence of a low-mass substructure (e.g. a luminous or dark satellite galaxy; also denoted as substructure hereafter) in the lens galaxy 1

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Section: Systematic Error On the Substructure Massmentioning

confidence: 75%

Gravitational detection of a low-mass dark satellite galaxy at cosmological distance

Vegetti

Lagattuta

McKean

et al. 2012

Nature

363

392

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“…We model the ACS image and time delays with Glee, a software package developed by Suyu & Halkola (2010) based on Suyu et al (2006) and Halkola et al (2008). The ACS image has 160 × 160 surface brightness pixels as constraints.…”

Section: Mcmc Samplingmentioning

confidence: 99%

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

Suyu

Auger

Hilbert

et al. 2013

ApJ

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379

553

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Strong gravitational lenses with measured time delays between the multiple images and models of the lens mass distribution allow a one-step determination of the time-delay distance, and thus a measure of cosmological parameters. We present a blind analysis of the gravitational lens RXJ1131−1231 incorporating (1) the newly measured time delays from COSMOGRAIL, the COSmological MOnitoring of GRAvItational Lenses, (2) archival Hubble Space Telescope imaging of the lens system, (3) a new velocity-dispersion measurement of the lens galaxy of 323 ± 20 km s −1 based on Keck spectroscopy, and (4) a characterization of the line-of-sight structures via observations of the lens' environment and ray tracing through the Millennium Simulation. Our blind analysis is designed to prevent experimenter bias. The joint analysis of the data sets allows a time-delay distance measurement to 6% precision that takes into account all known systematic uncertainties. Time-delay lenses constrain especially tightly the Hubble constant H 0 (5.7% and 4.0% respectively in wCDM and open ΛCDM) and curvature of the universe. The overall information content is similar to that of Baryon Acoustic Oscillation experiments. Thus, they complement well other cosmological probes, and provide an independent check of unknown systematics. Our measurement of the Hubble constant is completely independent of those based on the local distance ladder method, providing an important consistency check of the standard cosmological model and of general relativity.

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“…We perform the strong lensing analysis in the core of MACS 2129, using the parametric mass modelling software 'Gravitational Lensing Efficient Explorer', developed by S. H. Suyu and A. Halkola (Suyu & Halkola 2010;Suyu et al 2012). We adopt parametric mass profiles to describe the smooth large-scale cluster dark halo (DH) and the cluster members.…”

Section: S T Ro N G L E N S I N G I N G R E D I E N T Smentioning

confidence: 99%

Precise strong lensing mass profile of the CLASH galaxy cluster MACS 2129

Monna

Seitz

Balestra

et al. 2017

Mon. Not. R. Astron. Soc.

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We present a detailed strong lensing (SL) mass reconstruction of the core of the galaxy cluster MACS J2129.4−0741 (z cl = 0.589) obtained by combining high-resolution Hubble Space Telescope photometry from the CLASH (Cluster Lensing And Supernovae survey with Hubble) survey with new spectroscopic observations from the CLASH-VLT (Very Large Telescope) survey. A background bright red passive galaxy at z sp = 1.36, sextuply lensed in the cluster core, has four radial lensed images located over the three central cluster members. Further 19 background lensed galaxies are spectroscopically confirmed by our VLT survey, including 3 additional multiple systems. A total of 31 multiple images are used in the lensing analysis. This allows us to trace with high precision the total mass profile of the cluster in its very inner region (R < 100 kpc). Our final lensing mass model reproduces the multiple images systems identified in the cluster core with high accuracy of 0.4 arcsec. This translates to a high-precision mass reconstruction of MACS 2129, which is constrained at a level of 2 per cent. The cluster has Einstein parameter E = (29 ± 4) arcsec and a projected total mass of M tot (< E ) = (1.35 ± 0.03) × 10 14 M within such radius. Together with the cluster mass profile, we provide here also the complete spectroscopic data set for the cluster members and lensed images measured with VLT/Visible Multi-Object Spectrograph within the CLASH-VLT survey.

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The halos of satellite galaxies: the companion of the massive elliptical lens SL2S J08544−0121

Cited by 183 publications

References 68 publications

Gravitational detection of a low-mass dark satellite galaxy at cosmological distance

Gravitational detection of a low-mass dark satellite galaxy at cosmological distance

Two Accurate Time-Delay Distances From Strong Lensing: Implications for Cosmology

Precise strong lensing mass profile of the CLASH galaxy cluster MACS 2129

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