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Challenges in Explaining the Galactic Center Gamma-Ray Excess with Millisecond Pulsars.

DE141156540

Publication Date	2014
Personal Author	Cholis, I.; Hooper, D.; Linden, T.
Page Count	5
Abstract	Millisecond pulsars have been discussed as a possible source of the gamma-ray excess observed from the region surrounding the Galactic Center. With this in mind, we use the observed population of bright low-mass X-ray binaries to estimate the number of millisecond pulsars in the Inner Galaxy. This calculation suggests that only 1-5% of the excess is produced by millisecond pulsars. We also use the luminosity function derived from local measurements of millisecond pulsars, along with the number of point sources resolved by Fermi, to calculate an upper limit for the diffuse emission from such a population. While this limit is compatible with the millisecond pulsar population implied by the number of low-mass X-ray binaries, it strongly excludes the possibility that most of the excess originates from such objects.
Keywords	Gammma sources Pulsars Binary stars Emission Fermi Galaxies Luminosity Mass Measurement X-ray sources
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	54C - Astrophysics
Corporate Authors	Fermi National Accelerator Lab., Batavia, IL.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	201503

Challenges in Explaining the Galactic Center Gamma-Ray Excess with Millisecond Pulsars.

Challenges in Explaining the Galactic Center Gamma-Ray Excess with Millisecond Pulsars.
DE141156540

Publication Date	2014
Personal Author	Cholis, I.; Hooper, D.; Linden, T.
Page Count	5
Abstract	Millisecond pulsars have been discussed as a possible source of the gamma-ray excess observed from the region surrounding the Galactic Center. With this in mind, we use the observed population of bright low-mass X-ray binaries to estimate the number of millisecond pulsars in the Inner Galaxy. This calculation suggests that only 1-5% of the excess is produced by millisecond pulsars. We also use the luminosity function derived from local measurements of millisecond pulsars, along with the number of point sources resolved by Fermi, to calculate an upper limit for the diffuse emission from such a population. While this limit is compatible with the millisecond pulsar population implied by the number of low-mass X-ray binaries, it strongly excludes the possibility that most of the excess originates from such objects.
Keywords	Gammma sources Pulsars Binary stars Emission Fermi Galaxies Luminosity Mass Measurement X-ray sources
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	54C - Astrophysics
Corporate Authors	Fermi National Accelerator Lab., Batavia, IL.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	201503