Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where T. F. Eifler is active.

Publication


Featured researches published by T. F. Eifler.


Astronomy and Astrophysics | 2010

Evidence of the accelerated expansion of the Universe from weak lensing tomography with COSMOS

T. Schrabback; Jan Hartlap; B. Joachimi; Martin Kilbinger; Patrick Simon; K. Benabed; Maruša Bradač; T. F. Eifler; Thomas Erben; C. D. Fassnacht; F. William High; Stefan Hilbert; H. Hildebrandt; Henk Hoekstra; K. Kuijken; Phil Marshall; Y. Mellier; E. Morganson; Peter Schneider; Elisabetta Semboloni; L. van Waerbeke; Malin Velander

We present a comprehensive analysis of weak gravitational lensing by large-scale structure in the Hubble Space Telescope Cosmic Evolution Survey (COSMOS), in which we combine space-based galaxy shape measurements with ground-based photometric redshifts to study the redshift dependence of the lensing signal and constrain cosmological parameters. After applying our weak lensing-optimized data reduction, principal-component interpolation for the spatially, and temporally varying ACS point-spread function, and improved modelling of charge-transfer inefficiency, we measured a lensing signal that is consistent with pure gravitational modes and no significant shape systematics. We carefully estimated the statistical uncertainty from simulated COSMOS-like fields obtained from ray-tracing through the Millennium Simulation, including the full non-Gaussian sampling variance. We tested our lensing pipeline on simulated space-based data, recalibrated non-linear power spectrum corrections using the ray-tracing analysis, employed photometric redshift information to reduce potential contamination by intrinsic galaxy alignments, and marginalized over systematic uncertainties. We find that the weak lensing signal scales with redshift as expected from general relativity for a concordance ACDM cosmology, including the full cross-correlations between different redshift bins. Assuming a flat ACDM cosmology, we measure σ 8 (Ω m /0.3) 0.51 = 0.75 ± 0.08 from lensing, in perfect agreement with WMAP-5, yielding joint constraints Ω m = 0.266 +0.025 -0.023 σ 8 = 0.802 +0.028 -0.029 (all 68.3% conf.). Dropping the assumption of flatness and using priors from the HST Key Project and Big-Bang nucleosynthesis only, we find a negative deceleration parameter q 0 at 94.3% confidence from the tomographic lensing analysis, providing independent evidence of the accelerated expansion of the Universe. For a flat ωCDM cosmology and prior ω ∈ [-2, 0], we obtain ω < -0.41 (90% conf.). Our dark energy constraints are still relatively weak solely due to the limited area of COSMOS. However, they provide an important demonstration of the usefulness of tomographic weak lensing measurements from space.


The Astrophysical Journal | 2015

EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA

K. Bechtol; A. Drlica-Wagner; E. Balbinot; A. Pieres; J. D. Simon; Brian Yanny; B. Santiago; Risa H. Wechsler; Joshua A. Frieman; Alistair R. Walker; P. Williams; Eduardo Rozo; Eli S. Rykoff; A. Queiroz; E. Luque; A. Benoit-Lévy; Douglas L. Tucker; I. Sevilla; Robert A. Gruendl; L. N. da Costa; A. Fausti Neto; M. A. G. Maia; T. D. Abbott; S. Allam; R. Armstrong; A. Bauer; G. M. Bernstein; R. A. Bernstein; E. Bertin; David J. Brooks

We report the discovery of eight new Milky Way companions in ~1,800 deg^2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant over-density of individual stars consistent with the expected isochrone and luminosity function of an old and metal-poor stellar population. The objects span a wide range of absolute magnitudes (M_V from -2.2 mag to -7.4 mag), physical sizes (10 pc to 170 pc), and heliocentric distances (30 kpc to 330 kpc). Based on the low surface brightnesses, large physical sizes, and/or large Galactocentric distances of these objects, several are likely to be new ultra-faint satellite galaxies of the Milky Way and/or Magellanic Clouds. We introduce a likelihood-based algorithm to search for and characterize stellar over-densities, as well as identify stars with high satellite membership probabilities. We also present completeness estimates for detecting ultra-faint galaxies of varying luminosities, sizes, and heliocentric distances in the first-year DES data.


The Astrophysical Journal | 2015

Eight ultra-faint galaxy candidates discovered in year two of the Dark Energy Survey

A. Drlica-Wagner; K. Bechtol; E. S. Rykoff; E. Luque; A. Queiroz; Yao-Yuan Mao; Risa H. Wechsler; J. D. Simon; B. Santiago; Brian Yanny; E. Balbinot; Scott Dodelson; A. Fausti Neto; D. J. James; T. S. Li; M. A. G. Maia; J. L. Marshall; A. Pieres; Katelyn Stringer; Alistair R. Walker; Timothy M. C. Abbott; F. B. Abdalla; S. Allam; A. Benoit-Lévy; G. M. Bernstein; E. Bertin; David J. Brooks; Elizabeth J. Buckley-Geer; D. L. Burke; A. Carnero Rosell

We report the discovery of eight new ultra-faint dwarf galaxy candidates in the second year of optical imaging data from the Dark Energy Survey (DES). Six of these candidates are detected at high confidence, while two lower-confidence candidates are identified in regions of non-uniform survey coverage. The new stellar systems are found by three independent automated search techniques and are identified as overdensities of stars, consistent with the isochrone and luminosity function of an old and metal-poor simple stellar population. The new systems are faint (MV > −4.7


Monthly Notices of the Royal Astronomical Society | 2012

Image analysis for cosmology: results from the GREAT10 Galaxy Challenge

Thomas D. Kitching; Sreekumar T. Balan; Sarah Bridle; N. Cantale; F. Courbin; T. F. Eifler; Marc Gentile; M. S. S. Gill; Stefan Harmeling; Catherine Heymans; Michael Hirsch; K. Honscheid; Tomasz Kacprzak; D. Kirkby; Daniel Margala; Richard Massey; P. Melchior; G. Nurbaeva; K. Patton; J. Rhodes; Barnaby Rowe; Andy Taylor; M. Tewes; Massimo Viola; Dugan Witherick; Lisa Voigt; J. Young; Joe Zuntz

\mathrm{mag}


Monthly Notices of the Royal Astronomical Society | 2016

The DES Science Verification weak lensing shear catalogues

M. Jarvis; E. Sheldon; J. Zuntz; Tomasz Kacprzak; Sarah Bridle; Adam Amara; Robert Armstrong; M. R. Becker; G. M. Bernstein; C. Bonnett; C. L. Chang; Ritanjan Das; J. P. Dietrich; A. Drlica-Wagner; T. F. Eifler; C. Gangkofner; D. Gruen; Michael Hirsch; Eric Huff; Bhuvnesh Jain; S. Kent; D. Kirk; N. MacCrann; P. Melchior; A. A. Plazas; Alexandre Refregier; Barnaby Rowe; E. S. Rykoff; S. Samuroff; C. Sanchez

) and span a range of physical sizes (17


Physical Review D | 2016

Cosmic shear measurements with Dark Energy Survey science verification data

A. K. Romer; M. R. Becker; M. A. Troxel; N. MacCrann; E. Krause; T. F. Eifler; O. Friedrich; Andrina Nicola; Alexandre Refregier

\mathrm{pc}


Monthly Notices of the Royal Astronomical Society | 2016

redMaGiC : selecting luminous red galaxies from the DES Science Verification data

Eduardo Rozo; E. S. Rykoff; Alexandra Abate; C. Bonnett; M. Crocce; C. Davis; B. Hoyle; Boris Leistedt; Hiranya V. Peiris; Risa H. Wechsler; T. D. Abbott; F. B. Abdalla; M. Banerji; A. Bauer; A. Benoit-Lévy; G. M. Bernstein; E. Bertin; David J. Brooks; E. Buckley-Geer; D. L. Burke; D. Capozzi; A. Carnero Rosell; Daniela Carollo; M. Carrasco Kind; J. Carretero; Francisco J. Castander; Michael J. Childress; C. E. Cunha; C. B. D'Andrea; Tamara M. Davis

< r(1/2) < 181


The Astronomical Journal | 2015

Automated transient identification in the Dark Energy Survey

D. A. Goldstein; C. B. D'Andrea; J. A. Fischer; Ryan J. Foley; Ravi R. Gupta; Richard Kessler; A. G. Kim; Robert C. Nichol; Peter E. Nugent; A. Papadopoulos; Masao Sako; M. Smith; M. Sullivan; R. C. Thomas; W. C. Wester; R. C. Wolf; F. B. Abdalla; M. Banerji; A. Benoit-Lévy; E. Bertin; David J. Brooks; A. Carnero Rosell; Francisco J. Castander; L. N. da Costa; R. Covarrubias; D. L. DePoy; S. Desai; H. T. Diehl; P. Doel; T. F. Eifler

\mathrm{pc}


Physical Review D | 2013

Accounting for Baryons in Cosmological Constraints from Cosmic Shear

Andrew R. Zentner; Elisabetta Semboloni; Scott Dodelson; T. F. Eifler; Elisabeth Krause; Andrew P. Hearin

) and heliocentric distances (25 kpc < D(⊙) < 214 kpc). All of the new systems have central surface brightnesses consistent with known ultra-faint dwarf galaxies (μ ≳ 27.5


Monthly Notices of the Royal Astronomical Society | 2016

Cosmology constraints from shear peak statistics in Dark Energy Survey Science Verification data

Tomasz Kacprzak; D. Kirk; O. Friedrich; Adam Amara; Alexandre Refregier; Laura Marian; J. P. Dietrich; E. Suchyta; J. Aleksić; David Bacon; M. R. Becker; C. Bonnett; Sarah Bridle; C. L. Chang; T. F. Eifler; W. G. Hartley; Eric Huff; E. Krause; N. MacCrann; P. Melchior; Andrina Nicola; S. Samuroff; E. Sheldon; M. A. Troxel; J. Weller; J. Zuntz; T. M. C. Abbott; F. B. Abdalla; Robert Armstrong; A. Benoit-Lévy

\mathrm{mag}

Collaboration


Dive into the T. F. Eifler's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar

David J. Brooks

University College London

View shared research outputs
Top Co-Authors

Avatar

A. Benoit-Lévy

Institut d'Astrophysique de Paris

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

E. Bertin

Institut d'Astrophysique de Paris

View shared research outputs
Top Co-Authors

Avatar

L. N. da Costa

European Southern Observatory

View shared research outputs
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge