Journal ArticleDOI
POTENT Reconstruction from Mark III Velocities
Avishai Dekel,Avishai Dekel,A. Eldar,Tsafrir S. Kolatt,Tsafrir S. Kolatt,Amos Yahil,Jeffrey A. Willick,S. M. Faber,Stephane Courteau,David Burstein +9 more
TLDR
In this article, an improved version of the POTENT method for reconstructing the cosmological velocity and mass density fields from radial peculiar velocities, test it with mock catalogs, and apply it to the Mark III catalog of Galaxy Peculiar Velocities.Abstract:
We present an improved version of the POTENT method for reconstructing the cosmological velocity and mass density fields from radial peculiar velocities, test it with mock catalogs, and apply it to the Mark III Catalog of Galaxy Peculiar Velocities. The method is improved in several ways: (1) the inhomogeneous Malmquist bias is reduced by grouping and corrected statistically in either forward or inverse analyses of inferred distances, (2) the smoothing into a radial velocity field is optimized such that window and sampling biases are reduced, (3) the density field is derived from the velocity field using an improved weakly nonlinear approximation in Eulerian space, and (4) the computational errors are made negligible compared to the other errors. The method is carefully tested and optimized using realistic mock catalogs based on an N-body simulation that mimics our cosmological neighborhood, and the remaining systematic and random errors are evaluated quantitatively. The Mark III catalog, with ~3300 grouped galaxies, allows a reliable reconstruction with fixed Gaussian smoothing of 10-12 h-1 Mpc out to ~60 h-1 Mpc and beyond in some directions. We present maps of the three-dimensional velocity and mass-density fields and the corresponding errors. The typical systematic and random errors in the density fluctuations inside 40 h-1 Mpc are ±0.13 and ±0.18 (for Ω = 1). In its gross features, the recovered mass distribution resembles the galaxy distribution in redshift surveys and the mass distribution in a similar POTENT analysis of a complementary velocity catalog (SFI), including such features as the Great Attractor, Perseus-Pisces, and the large void in between. The reconstruction inside ~40 h-1 Mpc is not affected much by a revised calibration of the distance indicators (VM2, tailored to match the velocities from the IRAS 1.2 Jy redshift survey). The volume-weighted bulk velocity within the sphere of radius 50 h-1 Mpc about the Local Group is V50 = 370 ± 110 km s-1 (including systematic errors) and is shown to be mostly generated by external mass fluctuations. With the VM2 calibration, V50 is in a similar direction and reduced to 305 ± 110 km s-1.read more
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Cosmology and Fundamental Physics with the Euclid Satellite
Luca Amendola,Stephen Appleby,Anastasios Avgoustidis,David Bacon,Tessa Baker,Marco Baldi,Marco Baldi,Marco Baldi,Nicola Bartolo,Nicola Bartolo,Alain Blanchard,Camille Bonvin,Stefano Borgani,Stefano Borgani,Enzo Branchini,Enzo Branchini,Clare Burrage,Stefano Camera,Carmelita Carbone,Carmelita Carbone,Luciano Casarini,Luciano Casarini,Mark Cropper,Claudia de Rham,J. P. Dietrich,Cinzia Di Porto,Ruth Durrer,Anne Ealet,Pedro G. Ferreira,Fabio Finelli,Juan Garcia-Bellido,Tommaso Giannantonio,Luigi Guzzo,Luigi Guzzo,Alan Heavens,Lavinia Heisenberg,Catherine Heymans,Henk Hoekstra,Lukas Hollenstein,Rory Holmes,Zhiqi Hwang,Knud Jahnke,Thomas D. Kitching,Tomi S. Koivisto,Martin Kunz,Giuseppe Vacca,Eric V. Linder,M. March,Valerio Marra,Carlos Martins,Elisabetta Majerotto,Dida Markovic,David J. E. Marsh,Federico Marulli,Federico Marulli,Richard Massey,Yannick Mellier,Francesco Montanari,David F. Mota,Nelson J. Nunes,Will J. Percival,Valeria Pettorino,Valeria Pettorino,Cristiano Porciani,Claudia Quercellini,Justin I. Read,Massimiliano Rinaldi,Domenico Sapone,Ignacy Sawicki,Roberto Scaramella,Constantinos Skordis,Constantinos Skordis,Fergus Simpson,Andy Taylor,Shaun A. Thomas,Roberto Trotta,Licia Verde,Filippo Vernizzi,Adrian Vollmer,Yun Wang,Jochen Weller,T. G. Zlosnik +81 more
TL;DR: Euclid is a European Space Agency medium-class mission selected for launch in 2020 within the cosmic vision 2015-2025 program as discussed by the authors, which will explore the expansion history of the universe and the evolution of cosmic structures by measuring shapes and red-shift of galaxies as well as the distribution of clusters of galaxies over a large fraction of the sky.
Journal ArticleDOI
Cosmology and fundamental physics with the Euclid satellite
Luca Amendola,Stephen Appleby,David Bacon,Tessa Baker,Marco Baldi,Nicola Bartolo,Alain Blanchard,Camille Bonvin,Stefano Borgani,Enzo Branchini,Clare Burrage,Stefano Camera,Carmelita Carbone,Luciano Casarini,Mark Cropper,Claudia deRham,Cinzia Di Porto,Anne Ealet,Pedro G. Ferreira,Fabio Finelli,Juan Garcia-Bellido,Tommaso Giannantonio,Luigi Guzzo,Alan Heavens,Lavinia Heisenberg,Catherine Heymans,Henk Hoekstra,Lukas Hollenstein,Rory Holmes,Ole Horst,Knud Jahnke,Thomas D. Kitching,Tomi S. Koivisto,Martin Kunz,Giuseppe Vacca,M. March,Elisabetta Majerotto,Katarina Markovic,David J. E. Marsh,Federico Marulli,Richard Massey,Yannick Mellier,David F. Mota,Nelson J. Nunes,Will J. Percival,Valeria Pettorino,Cristiano Porciani,Claudia Quercellini,Justin I. Read,Massimiliano Rinaldi,Domenico Sapone,Roberto Scaramella,Constantinos Skordis,Fergus Simpson,Andy Taylor,Shaun A. Thomas,Roberto Trotta,Licia Verde,Filippo Vernizzi,Adrian Vollmer,Yun Wang,Jochen Weller,T. G. Zlosnik +62 more
TL;DR: This review is meant to provide a guide to the scientific themes that will underlie the activity of the group during the preparation of the Euclid mission and discusses five broad topics: dark energy and modified gravity, dark matter, initial conditions, basic assumptions and questions of methodology in the data analysis.
Journal ArticleDOI
The HST Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
Jeremy Mould,John P. Huchra,Wendy L. Freedman,Robert C. Kennicutt,Laura Ferrarese,Holland C. Ford,Brad K. Gibson,John A. Graham,Shaun M. G. Hughes,Garth D. Illingworth,Daniel D. Kelson,Lucas M. Macri,Barry F. Madore,Shoko Sakai,Kim Sebo,Nancy A. Silbermann,Peter B. Stetson +16 more
TL;DR: In this paper, a model of the velocity field was used to estimate the value of the Hubble constant within the range of the Tully-Fisher relation and its uncertainty, and the result is H_0 = 71 +/- 6 km/sec/Mpc. The largest contributor to this 67% confidence level result is the distance of the Large Magellanic Cloud, which has been assumed to be 50 +/- 3 kpc.
Journal ArticleDOI
The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
Jeremy Mould,John P. Huchra,Wendy L. Freedman,Robert C. Kennicutt,Laura Ferrarese,Holland C. Ford,Brad K. Gibson,John A. Graham,Shaun M. G. Hughes,Garth D. Illingworth,Daniel D. Kelson,Lucas M. Macri,Barry F. Madore,Shoko Sakai,Kim Sebo,Nancy A. Silbermann,Peter B. Stetson +16 more
TL;DR: In this paper, the Tully-fisher relation, the fundamental plane of elliptical galaxies, Type Ia supernovae, and surface brightness fluctuations are combined with a model of the velocity field to yield the best available estimate of the value of H0 within the range of these secondary distance indicators and its uncertainty.
Journal ArticleDOI
Cosmic Concordance and Quintessence
TL;DR: In this paper, a comprehensive study of the observational constraints on spatially flat cosmological models containing a mixture of matter and quintessence is presented, which is a timevarying, spatially inhomogeneous component of the energy density of the universe.
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