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This content will become publicly available on May 1, 2017

Title: Evolution of velocity dispersion along cold collisionless flows

We found that the infall of cold dark matter onto a galaxy produces cold collisionless flows and caustics in its halo. If a signal is found in the cavity detector of dark matter axions, the flows will be readily apparent as peaks in the energy spectrum of photons from axion conversion, allowing the densities, velocity vectors and velocity dispersions of the flows to be determined. We also discuss the evolution of velocity dispersion along cold collisionless flows in one and two dimensions. A technique is presented for obtaining the leading behaviour of the velocity dispersion near caustics. The results are used to derive an upper limit on the energy dispersion of the Big Flow from the sharpness of its nearby caustic, and a prediction for the dispersions in its velocity components.
Authors:
 [1] ;  [2]
  1. Univ. of Florida, Gainesville, FL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
OSTI Identifier:
1230048
Report Number(s):
FERMILAB-PUB--15-480-A-AE-PPD
Journal ID: ISSN 2470-0010; PRVDAQ; arXiv eprint number arXiv:1511.05947; TRN: US1601631
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 10; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS