T. Schrabback
A5026399168- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Remote Sensing in Agriculture
- Advanced Vision and Imaging
- Spectroscopy and Laser Applications
- Particle physics theoretical and experimental studies
- Calibration and Measurement Techniques
- Advanced Image Processing Techniques
- Gaussian Processes and Bayesian Inference
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Real-time simulation and control systems
Universität Innsbruck
2022-2025
Lander Institute
2007-2025
University of Bonn
2015-2024
Marconi University
2024
Kavli Institute for Particle Astrophysics and Cosmology
2011-2017
Stanford University
2011-2017
Leiden University
2008-2015
University of California, Santa Barbara
2014
Astronomical Observatory of Rome
2014
SLAC National Accelerator Laboratory
2011-2013
We present a finely-binned tomographic weak lensing analysis of the Canada-France-Hawaii Telescope Lensing Survey, CFHTLenS, mitigating contamination to signal from presence intrinsic galaxy alignments via simultaneous fit cosmological model and an alignment model. CFHTLenS spans 154 square degrees in five optical bands, with accurate shear photometric redshifts for sample median redshift zm =0.70. estimate 21 sets cosmic correlation functions associated six bins, each spanning angular range...
We present a catalog of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect signature from 2500 deg$^2$ South Pole Telescope (SPT) data. This work represents the complete sample detected at high significance in 2500-square-degree SPT-SZ survey, which was completed 2011. A total 677 (409) cluster candidates are identified above signal-to-noise threshold $\xi$ =4.5 (5.0). Ground- and space-based optical near-infrared (NIR) imaging confirms overdensities similarly colored galaxies...
We present the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) that accurately determines a weak gravitational lensing signal from full 154 square degrees of deep multi-colour data obtained by CFHT Legacy Survey. Weak large-scale structure is widely recognised as one most powerful but technically challenging probes cosmology. outline CFHTLenS analysis pipeline, describing how and why every step chain raw pixel to shear photometric redshift measurement has been revised improved...
The Shear TEsting Programme, STEP, is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for next generation wide-field surveys. In this first STEP paper we present results blind analysis simulated ground-based observations relatively simple galaxy morphologies. most successful methods are shown achieve percent level accuracy. From cosmic shear pipelines that have been used constrain cosmology, find measured an within statistical...
Using data from the COSMOS survey, we perform first joint analysis of galaxy-galaxy weak lensing, galaxy spatial clustering, and number densities. Carefully accounting for sample variance scatter between stellar halo mass, model all three observables simultaneously using a novel self-consistent theoretical framework. Our results provide strong constraints on shape redshift evolution stellar-to-halo mass relation (SHMR) z=0.2 to z=1. At low find that scales as Mh M*^0.46 this scaling does not...
A likelihood-based method for measuring weak gravitational lensing shear in deep galaxy surveys is described and applied to the Canada–France–Hawaii Telescope (CFHT) Lensing Survey (CFHTLenS). CFHTLenS comprises 154 deg2 of multi-colour optical data from CFHT Legacy Survey, with measurements being made i′ band a depth i′AB < 24.7, galaxies signal-to-noise ratio νSN ≳ 10. The based on lensfit algorithm earlier papers, but here we describe full analysis pipeline that takes into account...
We present data products from the Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS). CFHTLenS is based on Wide component of Legacy (CFHTLS). It encompasses 154 deg2 deep, optical, high-quality, sub-arcsecond imaging in five optical filters u*g′r′i′z′. The scientific aims team are weak gravitational lensing studies supported by photometric redshift estimates for galaxies. This paper presents our processing complete set. were able to obtain a set with very good image quality and...
We present cosmological constraints from 2D weak gravitational lensing by the large-scale structure in Canada-France Hawaii Telescope Lensing Survey (CFHTLenS) which spans 154 square degrees five optical bands. Using accurate photometric redshifts and measured shapes for 4.2 million galaxies between of 0.2 1.3, we compute cosmic shear correlation function over angular scales ranging 0.8 350 arcmin. non-linear models dark-matter power spectrum, constrain parameters exploring parameter space...
We present a tomographic cosmological weak lensing analysis of the HST COSMOS Survey. Applying our lensing-optimized data reduction, principal component interpolation for ACS PSF, and improved modelling charge-transfer inefficiency, we measure signal which is consistent with pure gravitational modes no significant shape systematics. carefully estimate statistical uncertainty from simulated COSMOS-like fields obtained ray-tracing through Millennium Simulation. test pipeline on space-based...
(abridged) We present cosmological constraints obtained from galaxy clusters identified by their Sunyaev-Zel'dovich effect signature in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich survey. consider 377 cluster candidates at z>0.25 with a detection significance greater than five, corresponding to 95% purity threshold for compute on models using measured abundance as function of mass and redshift. include additional multi-wavelength observations, including Chandra X-ray data...
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Context. The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG) observatory combines a large field of view and collecting area in energy range $\sim$0.2 to $\sim$8.0 keV with capability perform uniform scanning observations sky areas. Aims. SRG/eROSITA performed $\sim$140 square degrees Final Equatorial Depth Survey (eFEDS) as part its performance verification phase. observing time was chosen slightly exceed depth equatorial fields after completion all-sky survey. We present...
Clusters of galaxies can be used as powerful probes to study astrophysical processes on large scales, test theories the growth structure, and constrain cosmological models. The driving science goal SRG/eROSITA All-Sky Survey is assemble a sample X-ray clusters with well-defined selection function determine evolution mass and, hence, parameters. We present here catalog 12 247 optically confirmed galaxy groups detected in 0.2–2.3 keV extended sources 13 116 deg 2 region western Galactic half...
The evolution of the cluster mass function traces growth linear density perturbations, providing valuable insights into structures, nature dark matter, and cosmological parameters governing Universe. primary science goal eROSITA, on board Spectrum Roentgen Gamma (SRG) mission, is to constrain cosmology through function. In this paper, we present a set constraints obtained from 5259 clusters galaxies detected over an area 12791 deg 2 in western Galactic hemisphere eROSITA’s first All-Sky...
We present constraints on the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>f</a:mi><a:mo stretchy="false">(</a:mo><a:mi>R</a:mi><a:mo stretchy="false">)</a:mo></a:math> gravity model using a sample of 1005 galaxy clusters in redshift range 0.25–1.78 that have been selected through thermal Sunyaev-Zel’dovich effect from South Pole Telescope data and subjected to optical near-infrared confirmation with multicomponent matched filter algorithm. employ weak...
The Shear TEsting Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak lensing measurement, in preparation for next generation wide-field surveys. We review sixteen current emerging shear measurement methods common language, assess their performance by running them (blindly) on simulated images that contain known signal. determine features algorithms most successfully recover input parameters. achieve previously unattained discriminatory precision our...
The galaxy cluster 1E0657-56 (z = 0.296) is remarkably well-suited for addressing outstanding issues in both evolution and fundamental physics. We present a reconstruction of the mass distribution from strong weak gravitational lensing data. Multi-color, high-resolution HST ACS images allow detection many more arc candidates than were previously known, especially around subcluster. Using known redshift one multiply imaged systems, we determine remaining source redshifts using predictive...
The first half of this paper explores the origin systematic biases in measurement weak gravitational lensing. Compared to previous work, we expand investigation point spread function instability and fold for time effects non-idealities electronic imaging detectors imperfect galaxy shape algorithms. Together, these now explain additive |${\cal A}(\ell )$| multiplicative M}(\ell systematics typically reported current lensing measurements. We find that overall performance is driven by a product...
We present a study of the relation between dark matter halo mass and baryonic content host galaxies, quantified via luminosity stellar mass. Our investigation uses 154 deg2 Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) lensing photometric data, obtained from CFHT Legacy Survey. employ galaxy-galaxy model which allows us to constrain satellite fraction. analysis is limited lenses at redshifts 0.2 0.4. express relationship observable as power law. For luminosity-halo we find slope...
Dark energy may be the first sign of new fundamental physics in Universe, taking either a physical form or revealing correction to Einsteinian gravity. Weak gravitational lensing and galaxy peculiar velocities provide complementary probes General Relativity, combination allow us test modified theories gravity unique way. We perform such an analysis by combining measurements cosmic shear tomography from Canada-France Hawaii Telescope Lensing Survey (CFHTLenS) with growth structure WiggleZ...
Higher order, non-Gaussian aspects of the large-scale structure carry valuable information on formation and cosmology, which is complementary to second-order statistics. In this work, we measure second- third-order weak-lensing aperture-mass moments from Canada–France–Hawaii Lensing Survey (CFHTLenS) combine those with cosmic microwave background (CMB) anisotropy probes. The third moment measured a significance 2σ. combined constraint Σ8 = σ8(Ωm/0.27)α improved by 10 per cent, in comparison...
We present the results of GREAT08 Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was stimulate new ideas by presenting problem researchers outside measurement community. Six Team methods were presented at launch Challenge and five additional groups submitted during 6 month competition. Participants analyzed 30 million simulated galaxies with range in signal noise ratio, point-spread function ellipticity, galaxy size,...
Galaxy-galaxy weak lensing is a direct probe of the mean matter distribution around galaxies. The depth and sky coverage CFHT Legacy Survey yield statistically significant galaxy halo mass measurements over much wider range stellar masses ($10^{8.75}$ to $10^{11.3} M_{\odot}$) redshifts ($0.2 < z 0.8$) than previous studies. At redshift $z \sim 0.5$, stellar-to-halo ratio (SHMR) reaches maximum $4.0\pm0.2$ percent as function at $\sim 10^{12.25} M_{\odot}$. We find, for first time from...