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Title: Antiproton signatures from astrophysical and dark matter sources at the galactic center

Abstract

The center of our Galaxy is a complex region characterized by extreme phenomena. The presence of the supermassive Sagittarius A* black hole, a high dark matter density and an even higher baryonic density are able to produce very energetic processes. Indeed, high energetic gamma-rays have been observed by different telescopes, although their origin is not clear. In this work, we estimate the possible antiproton flux component associated with this signal. The expected secondary astrophysical antiproton background already saturates the observed data. It implies that any other important astrophysical source leads to an inconsistent excess. We estimate the sensitivity of PAMELA to this new primary antiproton source, which depends on the diffusion model and its spectral features. In particular, we consider antiproton spectra described by a power-law, a monochromatic signal and a Standard Model particle-antiparticle channel production. This latter spectrum is typical in the production from annihilating or decaying dark matter. We pay particular attention to the case of a heavy dark matter candidate, which could be associated with the High Energy Stereoscopic System (HESS) data observed from the J1745-290 source.

Authors:
;
Publication Date:
OSTI Identifier:
22525928
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANTIPROTON SOURCES; ANTIPROTONS; ASTROPHYSICS; BLACK HOLES; DENSITY; DIFFUSION; GAMMA RADIATION; MILKY WAY; MONOCHROMATIC RADIATION; NONLUMINOUS MATTER; STANDARD MODEL; TELESCOPES

Citation Formats

Cembranos, J. A.R., Gammaldi, V., and Maroto, A.L., E-mail: cembra@ucm.es, E-mail: vivigamm@ucm.es, E-mail: maroto@fis.ucm.es. Antiproton signatures from astrophysical and dark matter sources at the galactic center. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/03/041.
Cembranos, J. A.R., Gammaldi, V., & Maroto, A.L., E-mail: cembra@ucm.es, E-mail: vivigamm@ucm.es, E-mail: maroto@fis.ucm.es. Antiproton signatures from astrophysical and dark matter sources at the galactic center. United States. https://doi.org/10.1088/1475-7516/2015/03/041
Cembranos, J. A.R., Gammaldi, V., and Maroto, A.L., E-mail: cembra@ucm.es, E-mail: vivigamm@ucm.es, E-mail: maroto@fis.ucm.es. 2015. "Antiproton signatures from astrophysical and dark matter sources at the galactic center". United States. https://doi.org/10.1088/1475-7516/2015/03/041.
@article{osti_22525928,
title = {Antiproton signatures from astrophysical and dark matter sources at the galactic center},
author = {Cembranos, J. A.R. and Gammaldi, V. and Maroto, A.L., E-mail: cembra@ucm.es, E-mail: vivigamm@ucm.es, E-mail: maroto@fis.ucm.es},
abstractNote = {The center of our Galaxy is a complex region characterized by extreme phenomena. The presence of the supermassive Sagittarius A* black hole, a high dark matter density and an even higher baryonic density are able to produce very energetic processes. Indeed, high energetic gamma-rays have been observed by different telescopes, although their origin is not clear. In this work, we estimate the possible antiproton flux component associated with this signal. The expected secondary astrophysical antiproton background already saturates the observed data. It implies that any other important astrophysical source leads to an inconsistent excess. We estimate the sensitivity of PAMELA to this new primary antiproton source, which depends on the diffusion model and its spectral features. In particular, we consider antiproton spectra described by a power-law, a monochromatic signal and a Standard Model particle-antiparticle channel production. This latter spectrum is typical in the production from annihilating or decaying dark matter. We pay particular attention to the case of a heavy dark matter candidate, which could be associated with the High Energy Stereoscopic System (HESS) data observed from the J1745-290 source.},
doi = {10.1088/1475-7516/2015/03/041},
url = {https://www.osti.gov/biblio/22525928}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2015,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}