Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope

We report the results of the observation of the nearly satellite galaxy Segue 1 performed by the MAGIC-I ground-based gamma-ray telescope between November 2008 and March 2009 for a total of 43.2 hours. No significant gamma-ray emission was found above the bmkground. Differential upper limits on the...

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Autores: Antoranz Canales, Pedro, Barrio Uña, Juan Abel, Contreras González, José Luis, Fonseca González, María Victoria, López Moya, Marcos, Miranda Pantoja, José Miguel, Scapin, Valeria
Tipo de documento: artigo
Data de publicação:2011
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositório:Docta Complutense
Idioma:inglês
OAI Identifier:oai:docta.ucm.es:20.500.14352/43891
Acesso em linha:https://hdl.handle.net/20.500.14352/43891
Access Level:Acceso aberto
Palavra-chave:537
539.1
Gamma-Ray Emission
Dwarf Spheroidal Galaxies
Large-Area Telescope
Milky-Way Halo
Spectroscopic Survey
Galactic Satellites
Particle
Fermi
Constraints
Energies.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
id ES_7f20873bc696af467cd3d7c8d378965f
oai_identifier_str oai:docta.ucm.es:20.500.14352/43891
network_acronym_str ES
network_name_str España
repository_id_str
spelling Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescopeAntoranz Canales, PedroBarrio Uña, Juan AbelContreras González, José LuisFonseca González, María VictoriaLópez Moya, MarcosMiranda Pantoja, José MiguelScapin, Valeria537539.1Gamma-Ray EmissionDwarf Spheroidal GalaxiesLarge-Area TelescopeMilky-Way HaloSpectroscopic SurveyGalactic SatellitesParticleFermiConstraintsEnergies.Electrónica (Física)ElectricidadFísica nuclear2202.03 Electricidad2207 Física Atómica y NuclearWe report the results of the observation of the nearly satellite galaxy Segue 1 performed by the MAGIC-I ground-based gamma-ray telescope between November 2008 and March 2009 for a total of 43.2 hours. No significant gamma-ray emission was found above the bmkground. Differential upper limits on the grimma-ray flux are derived assuming various power-law slopes for the possible emission spectrum. Integral upper limits are also calculated for several power-law spectra and for different energy thresholds. The values are of the order of 10(-11) ph cm(-2) s(-1) above 100 GeV and 10(-12) ph cm(-2) s(-1) above 200 GeV. Segue 1 is currently considered one of the most interesting targets for indirect dark matter searches. In these terms, the upper limits have been also interpreted in the context of annihilating dark matter particles. For such purpose, we performed a grid scan over a reasonable portion of the parameter space for the minimal SuperGravity model and computed the flux upper limit for each point separately, taking fully into account the peculiar spectral features of each model. We found that in order to match the experimental upper limits with the model predictions, a minimum flux boost of 10(3) is required, and that the upper limits are quite dependent on the shape of the gamma-ray energy spectrum predicted by each specific model. Finally we compared the upper limits with the predictions of some dark matter models able to explain the PAMELA rise in the positron ratio, finding that Segue 1 data are in tension with the dark matter explanation of the PAMELA spectrum in the case of a dark matter candidate annihilating into tau(+)tau(-). A complete exclusion however is not possible due to the uncertainties in the Segue 1 astrophysical factor.Iop Publishing LtdUniversidad Complutense de Madrid20112011-06-0120112011-06-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/43891reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/438912026-06-02T12:44:21Z
dc.title.none.fl_str_mv Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
title Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
spellingShingle Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
Antoranz Canales, Pedro
537
539.1
Gamma-Ray Emission
Dwarf Spheroidal Galaxies
Large-Area Telescope
Milky-Way Halo
Spectroscopic Survey
Galactic Satellites
Particle
Fermi
Constraints
Energies.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
title_short Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
title_full Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
title_fullStr Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
title_full_unstemmed Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
title_sort Searches for dark matter annihilation signatures in the Segue 1 satellite galaxy with the MAGIC-I telescope
dc.creator.none.fl_str_mv Antoranz Canales, Pedro
Barrio Uña, Juan Abel
Contreras González, José Luis
Fonseca González, María Victoria
López Moya, Marcos
Miranda Pantoja, José Miguel
Scapin, Valeria
author Antoranz Canales, Pedro
author_facet Antoranz Canales, Pedro
Barrio Uña, Juan Abel
Contreras González, José Luis
Fonseca González, María Victoria
López Moya, Marcos
Miranda Pantoja, José Miguel
Scapin, Valeria
author_role author
author2 Barrio Uña, Juan Abel
Contreras González, José Luis
Fonseca González, María Victoria
López Moya, Marcos
Miranda Pantoja, José Miguel
Scapin, Valeria
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 537
539.1
Gamma-Ray Emission
Dwarf Spheroidal Galaxies
Large-Area Telescope
Milky-Way Halo
Spectroscopic Survey
Galactic Satellites
Particle
Fermi
Constraints
Energies.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
topic 537
539.1
Gamma-Ray Emission
Dwarf Spheroidal Galaxies
Large-Area Telescope
Milky-Way Halo
Spectroscopic Survey
Galactic Satellites
Particle
Fermi
Constraints
Energies.
Electrónica (Física)
Electricidad
Física nuclear
2202.03 Electricidad
2207 Física Atómica y Nuclear
description We report the results of the observation of the nearly satellite galaxy Segue 1 performed by the MAGIC-I ground-based gamma-ray telescope between November 2008 and March 2009 for a total of 43.2 hours. No significant gamma-ray emission was found above the bmkground. Differential upper limits on the grimma-ray flux are derived assuming various power-law slopes for the possible emission spectrum. Integral upper limits are also calculated for several power-law spectra and for different energy thresholds. The values are of the order of 10(-11) ph cm(-2) s(-1) above 100 GeV and 10(-12) ph cm(-2) s(-1) above 200 GeV. Segue 1 is currently considered one of the most interesting targets for indirect dark matter searches. In these terms, the upper limits have been also interpreted in the context of annihilating dark matter particles. For such purpose, we performed a grid scan over a reasonable portion of the parameter space for the minimal SuperGravity model and computed the flux upper limit for each point separately, taking fully into account the peculiar spectral features of each model. We found that in order to match the experimental upper limits with the model predictions, a minimum flux boost of 10(3) is required, and that the upper limits are quite dependent on the shape of the gamma-ray energy spectrum predicted by each specific model. Finally we compared the upper limits with the predictions of some dark matter models able to explain the PAMELA rise in the positron ratio, finding that Segue 1 data are in tension with the dark matter explanation of the PAMELA spectrum in the case of a dark matter candidate annihilating into tau(+)tau(-). A complete exclusion however is not possible due to the uncertainties in the Segue 1 astrophysical factor.
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-06-01
2011
2011-06-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/43891
url https://hdl.handle.net/20.500.14352/43891
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 3.0 España
https://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Iop Publishing Ltd
publisher.none.fl_str_mv Iop Publishing Ltd
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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