scholarly journals Quantifying the power spectrum of small-scale structure in semi-analytic galaxies

2019 ◽  
Vol 488 (4) ◽  
pp. 5085-5092 ◽  
Author(s):  
Sean Brennan ◽  
Andrew J Benson ◽  
Francis-Yan Cyr-Racine ◽  
Charles R Keeton ◽  
Leonidas A Moustakas ◽  
...  
Keyword(s):  
Dark Matter ◽  
Power Spectrum ◽  
Gravitational Lensing ◽  
Cold Dark Matter ◽  
Scale Structure ◽  
Small Scale ◽  
Small Scale Structure ◽  
Mass Distributions ◽  
Theoretical Predictions ◽  
Spectrum Distribution

Abstract In the cold dark matter (CDM) picture of structure formation, galaxy mass distributions are predicted to have a considerable amount of structure on small scales. Strong gravitational lensing has proven to be a useful tool for studying this small-scale structure. Much of the attention has been given to detecting individual dark matter subhaloes through lens modelling, but recent work has suggested that the full population of subhaloes could be probed using a power spectrum analysis. In this paper, we quantify the power spectrum of small-scale structure in simulated galaxies, with the goal of understanding theoretical predictions and setting the stage for using measurements of the power spectrum to test dark matter models. We use a sample of simulated galaxies generated from the galacticus semi-analytic model to determine the power spectrum distribution first in the CDM paradigm and then in a warm dark matter scenario. We find that a measurement of the slope and amplitude of the power spectrum on galaxy strong lensing scales (k ∼ 1 kpc−1) could be used to distinguish between CDM and alternate dark matter models, especially if the most massive subhaloes can be directly detected via gravitational imaging.

scholarly journals Small-scale structure of cold dark matter

2000 ◽  
Vol 87 (1-3) ◽  
pp. 93-95 ◽  
Author(s):  
Dominik J. Schwarz ◽  
Stefan Hofmann
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Scale Structure ◽  
Small Scale ◽  
Small Scale Structure

scholarly journals Hidden sector hydrogen as dark matter: Small-scale structure formation predictions and the importance of hyperfine interactions

2016 ◽  
Vol 94 (12) ◽  
Author(s):  
Kimberly K. Boddy ◽  
Manoj Kaplinghat ◽  
Anna Kwa ◽  
Annika H. G. Peter
Keyword(s):  
Dark Matter ◽  
Structure Formation ◽  
Hyperfine Interactions ◽  
Scale Structure ◽  
Small Scale ◽  
Small Scale Structure ◽  
Hidden Sector

scholarly journals Finite-Size Dark Matter and its Effect on Small-Scale Structure

2020 ◽  
Vol 124 (4) ◽  
Author(s):  
Xiaoyong Chu ◽  
Camilo Garcia-Cely ◽  
Hitoshi Murayama
Keyword(s):  
Dark Matter ◽  
Finite Size ◽  
Scale Structure ◽  
Small Scale ◽  
Small Scale Structure

Small-Scale Power Spectrum and Correlations in Lambda + Cold Dark Matter Models

1996 ◽  
Vol 466 ◽  
pp. 13 ◽  
Author(s):  
Anatoly Klypin ◽  
Joel Primack ◽  
Jon Holtzman
Keyword(s):  
Dark Matter ◽  
Power Spectrum ◽  
Cold Dark Matter ◽  
Small Scale

scholarly journals Small-scale Substructure in Dark Matter Haloes: Where Does Galaxy Formation Come to an End?

2004 ◽  
Vol 220 ◽  
pp. 91-98 ◽  
Author(s):  
J. E. Taylor ◽  
J. Silk ◽  
A. Babul
Keyword(s):  
Dark Matter ◽  
Power Spectrum ◽  
Structure Formation ◽  
Galaxy Formation ◽  
Cold Dark Matter ◽  
High Redshift ◽  
Small Scale ◽  
Analytic Model ◽  
Model Predictions ◽  
Low Mass

Models of structure formation based on cold dark matter predict that most of the small dark matter haloes that first formed at high redshift would have merged into larger systems by the present epoch. Substructure in present-day haloes preserves the remains of these ancient systems, providing the only direct information we may ever have about the low-mass end of the power spectrum. We describe some recent attempts to model halo substructure down to very small masses, using a semi-analytic model of halo formation. We make a preliminary comparison between the model predictions, observations of substructure in lensed systems, and the properties of local satellite galaxies.

scholarly journals Interferometric observations of the small-scale structure of Galactic neutral hydrogen

1985 ◽  
Vol 106 ◽  
pp. 321-322
Author(s):  
J. Crovisier ◽  
J. M. Dickey
Keyword(s):  
Power Spectrum ◽  
Dynamic Range ◽  
Neutral Hydrogen ◽  
Scale Structure ◽  
Small Scale ◽  
Turbulence Spectrum ◽  
Small Scale Structure ◽  
Image Position ◽  
Spatial Power Spectrum

The small-scale structure of galactic neutral hydrogen may be statistically described by the spatial power spectrum of the 21-cm line. This latter may be readily observed by interferometer arrays since it is the squared modulus of the visibility function. We have observed the , region with the Westerbork Synthesis Radio Telescope (Crovisier and Dickey, 1983). Brightness fluctuations of the 21-cm line were detected in this region on scales as small as 1.7 arcmin (corresponding to less than 5 pc). The Westerbork observations, combined with single-dish observations made at Nançay and Arecibo, allow determination of the spatial power spectrum over a dynamic range of about 106 in intensity. The spectrum follows roughly a power law with indices ~ −3 to −2. An interpretation in terms of the turbulence spectrum is proposed by Dickey (1985).

scholarly journals Small-scale structure of primordial black hole dark matter and its implications for accretion

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
Gert Hütsi ◽  
Martti Raidal ◽  
Hardi Veermäe
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Scale Structure ◽  
Small Scale ◽  
Primordial Black Hole ◽  
Small Scale Structure

scholarly journals Dark matter from late decays and the small-scale structure problems

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
Francesca Borzumati ◽  
Torsten Bringmann ◽  
Piero Ullio
Keyword(s):  
Dark Matter ◽  
Scale Structure ◽  
Small Scale ◽  
Small Scale Structure

scholarly journals Small-Scale Structure, Missing Galaxies and Gravitational Lensing

2004 ◽  
Vol 2004 (IAUS225) ◽  
pp. 267-277
Author(s):  
R. Benton Metcalf
Keyword(s):  
Gravitational Lensing ◽  
Scale Structure ◽  
Small Scale ◽  
Small Scale Structure
Sign in / Sign up

Export Citation Format

Share Document