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Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope
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2011 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, no 24, 241302Article in journal (Refereed) Published
Abstract [en]

Satellite galaxies of the Milky Way are among the most promising targets for dark matter searches in gamma rays. We present a search for dark matter consisting of weakly interacting massive particles, applying a joint likelihood analysis to 10 satellite galaxies with 24 months of data of the Fermi Large Area Telescope. No dark matter signal is detected. Including the uncertainty in the dark matter distribution, robust upper limits are placed on dark matter annihilation cross sections. The 95% confidence level upper limits range from about 10(-26) cm(3) s(-1) at 5 GeV to about 5 x 10(-23) cm(3) s(-1) at 1 TeV, depending on the dark matter annihilation final state. For the first time, using gamma rays, we are able to rule out models with the most generic cross section (similar to 3 x 10(-26) cm(3) s(-1) for a purely s-wave cross section), without assuming additional boost factors.

Place, publisher, year, edition, pages
2011. Vol. 107, no 24, 241302
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-70682DOI: 10.1103/PhysRevLett.107.241302ISI: 000297797700002OAI: oai:DiVA.org:su-70682DiVA: diva2:482236
Projects
The Fermi-LAT Collaboration
Note

authorCount :152

Available from: 2012-01-23 Created: 2012-01-23 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Dark Matter searches targeting Dwarf Spheroidal Galaxies with the Fermi Large Area Telescope
Open this publication in new window or tab >>Dark Matter searches targeting Dwarf Spheroidal Galaxies with the Fermi Large Area Telescope
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis I present our recent work on gamma-ray searches for dark matter with the Fermi Large Area Telescope (Fermi-LAT). We have targeted dwarf spheroidal galaxies since they are very dark matter dominated systems, and we have developed a novel joint likelihood method to combine the observations of a set of targets.

In the first iteration of the joint likelihood analysis, 10 dwarf spheroidal galaxies are targeted and 2 years of Fermi-LAT data is analyzed. The resulting upper limits on the dark matter annihilation cross-section range from about 10−26 cm3 s−1 for dark matter masses of 5 GeV to about 5 × 10−23 cm3 s−1 for dark matter masses of 1 TeV, depending on the annihilation channel. For the first time, dark matter models with a cross section above the canonical thermal relic cross section (∼ 3 × 10−26 cm3 s−1) are strongly disfavored by a gamma-ray experiment. In the second iteration we include 15 dwarf spheroidal galaxies in the combined analysis, employ 4 years of data and an improved calculation of the dark matter density. The obtained upper limits range from about 10−26 cm3 s−1 for dark matter masses of 2 GeV to about 10−21 cm3 s−1 for dark matter masses of 10 TeV, depending on the annihilation channel.

I briefly describe some of the evidence for dark matter, the Fermi-LAT instrument and public data releases, dwarf spheroidal galaxies, likelihood analysis, and results from analyses of Fermi-LAT data. I also document some of the tests made to verify the method and to compare different analysis setups.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2015. 120 p.
Keyword
dark matter, Fermi-LAT, dwarf spheroidal galaxies
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-118905 (URN)978-91-7649-224-6 (ISBN)
Public defence
2015-09-28, FB53, AlbaNova University Center, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
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Available from: 2015-09-04 Created: 2015-07-21 Last updated: 2015-11-02Bibliographically approved

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