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Title: Millisecond Pulsars, TeV Halos, and Implications For The Galactic Center Gamma-Ray Excess

Abstract

Observations by HAWC indicate that many young pulsars (including Geminga and Monogem) are surrounded by spatially extended, multi-TeV emitting regions. It is not currently known, however, whether TeV emission is also produced by recycled, millisecond pulsars (MSPs). In this study, we perform a stacked analysis of 24 MSPs within HAWC's field-of-view, finding between 2.6-3.2 sigma evidence that these sources are, in fact, surrounded by TeV halos. The efficiency with which these MSPs produce TeV halos is similar to that exhibited by young pulsars. This result suggests that several dozen MSPs will ultimately be detectable by HAWC, including many "invisible" pulsars without radio beams oriented in our direction. The TeV halos of unresolved MSPs could also dominate the TeV-scale diffuse emission observed at high galactic latitudes. We also discuss the possibility that TeV and radio observations could be used to constrain the population of MSPs that is present in the inner Milky Way, thereby providing us with a new way to test the hypothesis that MSPs are responsible for the Galactic Center GeV excess.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Fermilab
  2. UC, Santa Cruz, Inst. Part. Phys.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1436717
Report Number(s):
FERMILAB-PUB-18-069-A; arXiv:1803.08046
1663566
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Hooper, Dan, and Linden, Tim. Millisecond Pulsars, TeV Halos, and Implications For The Galactic Center Gamma-Ray Excess. United States: N. p., 2018. Web.
Hooper, Dan, & Linden, Tim. Millisecond Pulsars, TeV Halos, and Implications For The Galactic Center Gamma-Ray Excess. United States.
Hooper, Dan, and Linden, Tim. Wed . "Millisecond Pulsars, TeV Halos, and Implications For The Galactic Center Gamma-Ray Excess". United States. doi:. https://www.osti.gov/servlets/purl/1436717.
@article{osti_1436717,
title = {Millisecond Pulsars, TeV Halos, and Implications For The Galactic Center Gamma-Ray Excess},
author = {Hooper, Dan and Linden, Tim},
abstractNote = {Observations by HAWC indicate that many young pulsars (including Geminga and Monogem) are surrounded by spatially extended, multi-TeV emitting regions. It is not currently known, however, whether TeV emission is also produced by recycled, millisecond pulsars (MSPs). In this study, we perform a stacked analysis of 24 MSPs within HAWC's field-of-view, finding between 2.6-3.2 sigma evidence that these sources are, in fact, surrounded by TeV halos. The efficiency with which these MSPs produce TeV halos is similar to that exhibited by young pulsars. This result suggests that several dozen MSPs will ultimately be detectable by HAWC, including many "invisible" pulsars without radio beams oriented in our direction. The TeV halos of unresolved MSPs could also dominate the TeV-scale diffuse emission observed at high galactic latitudes. We also discuss the possibility that TeV and radio observations could be used to constrain the population of MSPs that is present in the inner Milky Way, thereby providing us with a new way to test the hypothesis that MSPs are responsible for the Galactic Center GeV excess.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 21 00:00:00 EDT 2018},
month = {Wed Mar 21 00:00:00 EDT 2018}
}