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Title: Active Galactic Nuclei and the Origin of IceCube's Diffuse Neutrino Flux

Abstract

The excess of neutrino candidate events detected by IceCube from the direction of TXS 0506+056 has generated a great deal of interest in blazars as sources of high-energy neutrinos. In this study, we analyze the publicly available portion of the IceCube dataset, performing searches for neutrino point sources in spatial coincidence with the blazars and other active galactic nuclei contained in the Fermi 3LAC and the Roma BZCAT catalogs, as well as in spatial and temporal coincidence with flaring sources identified in the Fermi Collaboration's All-Sky Variability Analysis (FAVA). We find no evidence that blazars generate a significant flux of high-energy neutrinos, and conclude that no more than 5-15% of the diffuse flux measured by IceCube can originate from this class of objects. While we cannot rule out the possibility that TXS 0506+056 has at times generated significant neutrino emission, we find that such behavior cannot be common among blazars, requiring TXS 0506+056 to be a rather extreme outlier and not representative of the overall blazar population. The bulk of the diffuse high-energy neutrino flux must instead be generated by a significantly larger population of less-luminous sources, such as non-blazar active galactic nuclei.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Chicago U., KICP
  2. Ohio State U., CCAPP
  3. Chicago U., EFI
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:
1487046
Report Number(s):
arXiv:1810.02823; FERMILAB-PUB-18-528-A
1697314
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
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, Linden, Tim, and Vieregg, Abby. Active Galactic Nuclei and the Origin of IceCube's Diffuse Neutrino Flux. United States: N. p., 2018. Web.
Hooper, Dan, Linden, Tim, & Vieregg, Abby. Active Galactic Nuclei and the Origin of IceCube's Diffuse Neutrino Flux. United States.
Hooper, Dan, Linden, Tim, and Vieregg, Abby. Fri . "Active Galactic Nuclei and the Origin of IceCube's Diffuse Neutrino Flux". United States. https://www.osti.gov/servlets/purl/1487046.
@article{osti_1487046,
title = {Active Galactic Nuclei and the Origin of IceCube's Diffuse Neutrino Flux},
author = {Hooper, Dan and Linden, Tim and Vieregg, Abby},
abstractNote = {The excess of neutrino candidate events detected by IceCube from the direction of TXS 0506+056 has generated a great deal of interest in blazars as sources of high-energy neutrinos. In this study, we analyze the publicly available portion of the IceCube dataset, performing searches for neutrino point sources in spatial coincidence with the blazars and other active galactic nuclei contained in the Fermi 3LAC and the Roma BZCAT catalogs, as well as in spatial and temporal coincidence with flaring sources identified in the Fermi Collaboration's All-Sky Variability Analysis (FAVA). We find no evidence that blazars generate a significant flux of high-energy neutrinos, and conclude that no more than 5-15% of the diffuse flux measured by IceCube can originate from this class of objects. While we cannot rule out the possibility that TXS 0506+056 has at times generated significant neutrino emission, we find that such behavior cannot be common among blazars, requiring TXS 0506+056 to be a rather extreme outlier and not representative of the overall blazar population. The bulk of the diffuse high-energy neutrino flux must instead be generated by a significantly larger population of less-luminous sources, such as non-blazar active galactic nuclei.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:

Figures / Tables:

Figure 1 Figure 1: The likelihood distribution in favor of a neutrino point source at locations across the sky in a grid of 0.2° steps. The observed distribution shows no compelling evidence of any neutrino point sources. Sky locations with ∆ ln L < 0 (corresponding to a best fit with amore » negative point source flux) are not shown. We also include error bars conveying the 68% Poissonian confidence interval on each bin.« less

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