Repository of University of Nova Gorica

Show document
A+ | A- | Help | SLO | ENG

Title:On velocity-dependent dark matter annihilations in dwarf satellites
Authors:ID Petač, Mihael (Author)
ID Ullio, Piero (Author)
ID Valli, Mauro (Author)
Files:URL https://iopscience.iop.org/article/10.1088/1475-7516/2018/12/039
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Milky Way dwarf spheroidal satellites are a prime target for Dark Matter (DM) indirect searches. There have been recent reassessments of the expected DM gamma-ray signals in case of long-range interactions, commonly known as Sommerfeld enhancement. Since details of the underlying DM phase-space distribution function become critical, there are potentially large uncertainties in the final result. We provide here a first attempt towards a comprehensive investigation of these systematics, addressing the impact on the expected DM flux from Milky Way dwarfs via Bayesian inference on the available stellar kinematic datasets. After reconsidering the study case of ergodic systems, we investigate for the first time scenarios where DM particle orbits may have a radial or tangential bias. We consider both cuspy and cored parametric DM density profiles, together with the case of a non-parametric halo modelling directly connected to line-of-sight observable quantities. The main findings of our work highlight the relevance of the assumed phase-space distribution: Referring to a generalized J-factor, namely the line-of-sight convolution of the spatial part in case of velocity-dependent annihilation rate, an enhancement (suppression) with respect to the limit of isotropic phase-space distributions is obtained for the case of tangentially (radially) biased DM particle orbits. We provide new estimates for J-factors for the eight brightest Milky Way dwarfs also in the limit of velocity-independent DM annihilation, in good agreement with previous results in literature, and derive data-driven lower-bounds based on the non-parametric modelling of the halo density. The outcome of our broad study stands out as a representative of the state-of-the-art in the field, and falls within the interest of current and future experimental collaborations involved in DM indirect detection programs.
Keywords:dark matter, indirect detection, dwarf satellites, sommerfeld enhancement, gamma-rays
Year of publishing:2018
Number of pages:str. 1-32
Numbering:Vol. 2018, no. 12
PID:20.500.12556/RUNG-6830 New window
COBISS.SI-ID:78755075 New window
UDC:52
ISSN on article:1475-7516
DOI:10.1088/1475-7516/2018/12/039 New window
NUK URN:URN:SI:UNG:REP:UICFKNXM
Publication date in RUNG:01.10.2021
Views:1876
Downloads:44
Metadata:XML RDF-CHPDL DC-XML DC-RDF
:
Copy citation
  
Average score:(1 vote)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share


Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Record is a part of a journal

Title:Journal of cosmology and astroparticle physics
Publisher:Institute of Physics Pub.
ISSN:1475-7516
COBISS.SI-ID:389627 New window

Document is financed by a project

Funder:EC - European Commission
Funding programme:H2020
Project number:674896

Back