Evolution of velocity dispersion along cold collisionless flows
- Univ. of Florida, Gainesville, FL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Univ. of Florida, Gainesville, FL (United States)
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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- AC02-07CH11359; FG02-97ER41209
- OSTI ID:
- 1230048
- Alternate ID(s):
- OSTI ID: 1252382
- Report Number(s):
- FERMILAB-PUB-15-480-A-AE-PPD; PRVDAQ; arXiv eprint number arXiv:1511.05947; TRN: US1601631
- Journal Information:
- Physical Review D, Vol. 93, Issue 10; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
New astrophysical bounds on ultralight axionlike particles
Diurnal and annual modulation of cold dark matter signals