scholarly journals The Mass of the Coma Cluster from Weak Lensing in the Sloan Digital Sky Survey

2007 ◽  
Vol 671 (2) ◽  
pp. 1466-1470 ◽  
Author(s):  
Jeffrey M. Kubo ◽  
Albert Stebbins ◽  
James Annis ◽  
Ian P. Dell’Antonio ◽  
Huan Lin ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Coma Cluster ◽  
Sky Survey

scholarly journals How dark are filaments in the cosmic web?

2020 ◽  
Vol 498 (3) ◽  
pp. 3158-3170
Author(s):  
Tianyi Yang ◽  
Michael J Hudson ◽  
Niayesh Afshordi
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Cold Dark Matter ◽  
Stellar Mass ◽  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Sky Survey ◽  
Mass Fractions ◽  
The Masses ◽  
Red Galaxies

ABSTRACT The cold dark matter model predicts that dark matter haloes are connected by filaments. Direct measurements of the masses and structure of these filaments are difficult, but recently several studies have detected these dark-matter-dominated filaments using weak lensing. Here we study the efficiency of galaxy formation within the filaments by measuring their total mass-to-light ratios and stellar mass fractions. Specifically, we stack pairs of luminous red galaxies (LRGs) with a typical separation on the sky of 8 h−1 Mpc. We stack background galaxy shapes around pairs to obtain mass maps through weak lensing, and we stack galaxies from the Sloan Digital Sky Survey to obtain maps of light and stellar mass. To isolate the signal from the filament, we construct two matched catalogues of physical and non-physical (projected) LRG pairs, with the same distributions of redshift and separation. We then subtract the two stacked maps. Using LRG pair samples from the Baryon Oscillation Spectroscopic Survey at two different redshifts, we find that the evolution of the mass in filament is consistent with the predictions from perturbation theory. The filaments are not entirely dark: Their mass-to-light ratios (M/L = 351 ± 137 in solar units in the rband) and stellar mass fractions (Mstellar/M = 0.0073 ± 0.0030) are consistent with the cosmic values (and with their redshift evolutions).

scholarly journals The First Hour of Extragalactic Data of the Sloan Digital Sky Survey Spectroscopic Commissioning: The Coma Cluster

2001 ◽  
Vol 121 (5) ◽  
pp. 2331-2357 ◽  
Author(s):  
Francisco J. Castander ◽  
Robert C. Nichol ◽  
Aronne Merrelli ◽  
Scott Burles ◽  
Adrian Pope ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Coma Cluster ◽  
Sky Survey

scholarly journals KiDS+GAMA: Intrinsic alignment model constraints for current and future weak lensing cosmology

2019 ◽  
Vol 624 ◽  
pp. A30 ◽  
Author(s):  
Harry Johnston ◽  
Christos Georgiou ◽  
Benjamin Joachimi ◽  
Henk Hoekstra ◽  
Nora Elisa Chisari ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Satellite Galaxy ◽  
Sky Survey ◽  
The Galaxy ◽  
Resolution Imaging ◽  
Cosmic Shear ◽  
Linear Alignment ◽  
Red Galaxies ◽  
Blue Galaxy

We directly constrain the non-linear alignment (NLA) model of intrinsic galaxy alignments, analysing the most representative and complete flux-limited sample of spectroscopic galaxies available for cosmic shear surveys. We measure the projected galaxy position-intrinsic shear correlations and the projected galaxy clustering signal using high-resolution imaging from the Kilo Degree Survey (KiDS) overlapping with the GAMA spectroscopic survey, and data from the Sloan Digital Sky Survey. Separating samples by colour, we make no significant detection of blue galaxy alignments, constraining the blue galaxy NLA amplitude AIAB = 0.21−0.36+0.37 to be consistent with zero. We make robust detections (∼9σ) for red galaxies, with AIAR = 3.18−0.46+0.47, corresponding to a net radial alignment with the galaxy density field, and we find no evidence for any scaling of alignments with galaxy luminosity. We provide informative priors for current and future weak lensing surveys, an improvement over de facto wide priors that allow for unrealistic levels of intrinsic alignment contamination. For a colour-split cosmic shear analysis of the final KiDS survey area, we forecast that our priors will improve the constraining power on S8 and the dark energy equation of state w0, by up to 62% and 51%, respectively. Our results indicate, however, that the modelling of red/blue-split galaxy alignments may be insufficient to describe samples with variable central/satellite galaxy fractions.

scholarly journals The Galaxy-Mass Correlation Function Measured from Weak Lensing in the Sloan Digital Sky Survey

2004 ◽  
Vol 127 (5) ◽  
pp. 2544-2564 ◽  
Author(s):  
Erin S. Sheldon ◽  
David E. Johnston ◽  
Joshua A. Frieman ◽  
Ryan Scranton ◽  
Timothy A. McKay ◽  
...  
Keyword(s):  
Correlation Function ◽  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Sky Survey ◽  
The Galaxy

scholarly journals A gravitational lensing detection of filamentary structures connecting luminous red galaxies

2020 ◽  
Vol 633 ◽  
pp. A89 ◽  
Author(s):  
Qianli Xia ◽  
Naomi Robertson ◽  
Catherine Heymans ◽  
Alexandra Amon ◽  
Marika Asgari ◽  
...  
Keyword(s):  
Gravitational Lensing ◽  
Critical Density ◽  
Average Density ◽  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Luminous Red Galaxies ◽  
Sky Survey ◽  
Combining Data ◽  
Red Galaxies ◽  
Cluster Sequence

We present a weak lensing detection of filamentary structures in the cosmic web, combining data from the Kilo-Degree Survey, the Red Cluster Sequence Lensing Survey, and the Canada-France-Hawaii Telescope Lensing Survey. The line connecting luminous red galaxies with a separation of 3 − 5 h−1 Mpc was chosen as a proxy for the location of filaments. We measured the average weak lensing shear around ∼11 000 candidate filaments selected in this way from the Sloan Digital Sky Survey. After nulling the shear induced by the dark matter haloes around each galaxy, we reported a 3.4σ detection of an anisotropic shear signal from the matter that connects them. Adopting a filament density profile, motivated from N-body simulations, the average density at the centre of these filamentary structures was found to be 15 ± 4 times the critical density.

scholarly journals Dynamical Confirmation of Sloan Digital Sky Survey Weak-lensing Scaling Laws

2002 ◽  
Vol 571 (2) ◽  
pp. L85-L88 ◽  
Author(s):  
Timothy A. McKay ◽  
Erin Scott Sheldon ◽  
David Johnston ◽  
Eva K. Grebel ◽  
Francisco Prada ◽  
...  
Keyword(s):  
Scaling Laws ◽  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Sky Survey

scholarly journals Weak Lensing and the Sloan Digital Sky Survey

1996 ◽  
pp. 75-80 ◽  
Author(s):  
Albert Stebbins ◽  
Tim McKay ◽  
Joshua A. Frieman
Keyword(s):  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Sky Survey

scholarly journals Modelling galaxy-galaxy weak lensing with Sloan Digital Sky Survey groups

2009 ◽  
Vol 394 (2) ◽  
pp. 1016-1030 ◽  
Author(s):  
Ran Li ◽  
H. J. Mo ◽  
Zuhui Fan ◽  
Marcello Cacciato ◽  
Frank C. van den Bosch ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Weak Lensing ◽  
Sky Survey

scholarly journals Large-scale structure and the intrinsic alignment of galaxies

2014 ◽  
Vol 11 (S308) ◽  
pp. 452-455 ◽  
Author(s):  
Jonathan Blazek ◽  
Uroš Seljak ◽  
Rachel Mandelbaum
Keyword(s):  
Observational Data ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Sloan Digital Sky Survey ◽  
Significant Source ◽  
Weak Lensing ◽  
Sky Survey ◽  
Alignment Model

AbstractCoherent alignments of galaxy shapes, often called“intrinsic alignments” (IA), are the most significant source of astrophysical uncertainty in weak lensing measurements. We develop the tidal alignment model of IA and demonstrate its success in describing observational data. We also describe a technique to separate IA from galaxy-galaxy lensing measurements. Applying this technique to luminous red galaxy lenses in the Sloan Digital Sky Survey, we constrain potential IA contamination from associated sources to be below a few percent.

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