The gamma-ray luminosity function of millisecond pulsars and implications for the GeV excess

Hooper, Dan; Mohlabeng, Gopolang

doi:10.1088/1475-7516/2016/03/049

Title: The gamma-ray luminosity function of millisecond pulsars and implications for the GeV excess

Journal Article · Tue Mar 29 00:00:00 EDT 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/03/049· OSTI ID:1249200

Hooper, Dan ^[1]; Mohlabeng, Gopolang ^[2]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Kansas, Lawrence, KS (United States)

It has been proposed that a large population of unresolved millisecond pulsars (MSPs) could potentially account for the excess of GeV-scale gamma-rays observed from the region surrounding the Galactic Center. The viability of this scenario depends critically on the gamma-ray luminosity function of this source population, which determines how many MSPs Fermi should have already detected as resolved point sources. In this paper, we revisit the gamma-ray luminosity function of MSPs, without relying on uncertain distance measurements. Our determination, based on a comparison of models with the observed characteristics of the MSP population, suggests that Fermi should have already detected a significant number of sources associated with such a hypothesized Inner Galaxy population. As a result, we cannot rule out a scenario in which the MSPs residing near the Galactic Center are systematically less luminous than those present in the Galactic Plane or within globular clusters.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1249200

Report Number(s):: FERMILAB-PUB-15-559-A; arXiv:1512.04966; 1409878

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 1603, Issue 03; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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