skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Impact of astrophysical processes on the gamma-ray background from dark matter annihilations

Abstract

We study the impact of astrophysical processes on the gamma-ray background produced by the annihilation of dark matter particles in cosmological halos, with particular attention to the consequences of the formation of supermassive black holes. In scenarios where these objects form adiabatically from the accretion of matter on small seeds, dark matter is first compressed into very dense 'spikes', then its density progressively decreases due to annihilations and scattering of stellar cusps. With respect to previous analyses, based on non-evolving halos, the predicted annihilation signal is higher and significantly distorted at low energies, reflecting the large contribution to the total flux from unevolved spikes at high redshifts. The peculiar spectral feature arising from the specific redshift distribution of the signal, would discriminate the proposed scenario from more conventional astrophysical explanations. We discuss how this affects the prospects for detection and demonstrate that the gamma-ray background from DM annihilations might be detectable even in absence of a signal from the Galactic center.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
917441
Report Number(s):
FERMILAB-PUB-07-105-A
Journal ID: ISSN 0556-2821; PRVDAQ; arXiv eprint number astro-ph/0703236; TRN: US0804542
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.D76:023517,2007; Journal Volume: 76
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANNIHILATION; BLACK HOLES; DETECTION; DISTRIBUTION; NONLUMINOUS MATTER; SCATTERING; SEEDS; Astrophysics

Citation Formats

Ahn, Eun-Joo, /Chicago U., Astron. Astrophys. Ctr. /KICP, Chicago /Fermilab /Bartol Research Inst., Bertone, Gianfranco, /Rochester Inst. Tech., Merritt, David, and /Shanghai, Astron. Observ. Impact of astrophysical processes on the gamma-ray background from dark matter annihilations. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.76.023517.
Ahn, Eun-Joo, /Chicago U., Astron. Astrophys. Ctr. /KICP, Chicago /Fermilab /Bartol Research Inst., Bertone, Gianfranco, /Rochester Inst. Tech., Merritt, David, & /Shanghai, Astron. Observ. Impact of astrophysical processes on the gamma-ray background from dark matter annihilations. United States. doi:10.1103/PhysRevD.76.023517.
Ahn, Eun-Joo, /Chicago U., Astron. Astrophys. Ctr. /KICP, Chicago /Fermilab /Bartol Research Inst., Bertone, Gianfranco, /Rochester Inst. Tech., Merritt, David, and /Shanghai, Astron. Observ. Thu . "Impact of astrophysical processes on the gamma-ray background from dark matter annihilations". United States. doi:10.1103/PhysRevD.76.023517. https://www.osti.gov/servlets/purl/917441.
@article{osti_917441,
title = {Impact of astrophysical processes on the gamma-ray background from dark matter annihilations},
author = {Ahn, Eun-Joo and /Chicago U., Astron. Astrophys. Ctr. /KICP, Chicago /Fermilab /Bartol Research Inst. and Bertone, Gianfranco and /Rochester Inst. Tech. and Merritt, David and /Shanghai, Astron. Observ.},
abstractNote = {We study the impact of astrophysical processes on the gamma-ray background produced by the annihilation of dark matter particles in cosmological halos, with particular attention to the consequences of the formation of supermassive black holes. In scenarios where these objects form adiabatically from the accretion of matter on small seeds, dark matter is first compressed into very dense 'spikes', then its density progressively decreases due to annihilations and scattering of stellar cusps. With respect to previous analyses, based on non-evolving halos, the predicted annihilation signal is higher and significantly distorted at low energies, reflecting the large contribution to the total flux from unevolved spikes at high redshifts. The peculiar spectral feature arising from the specific redshift distribution of the signal, would discriminate the proposed scenario from more conventional astrophysical explanations. We discuss how this affects the prospects for detection and demonstrate that the gamma-ray background from DM annihilations might be detectable even in absence of a signal from the Galactic center.},
doi = {10.1103/PhysRevD.76.023517},
journal = {Phys.Rev.D76:023517,2007},
number = ,
volume = 76,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}