Search for neutrino emission from cores of active galactic nuclei
The sources of the majority of the high-energy astrophysical neutrinos observed with the IceCube neutrino telescope at the South Pole are unknown. So far, only a flaring gamma-ray blazar was compellingly associated with the emission of high-energy neutrinos. However, several studies suggest that the...
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Uppsala universitet, Högenergifysik
2022
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-493914 https://doi.org/10.1103/PhysRevD.106.022005 |
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ftuppsalauniv:oai:DiVA.org:uu-493914 2023-05-15T18:23:10+02:00 Search for neutrino emission from cores of active galactic nuclei Abbasi, R. Botner, Olga Burgman, Alexander Glaser, Christian Hallgren, Allan O'Sullivan, Erin Pérez de los Heros, Carlos Sharma, Ankur Valtonen-Mattila, Nora Zhelnin, P. 2022 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-493914 https://doi.org/10.1103/PhysRevD.106.022005 eng eng Uppsala universitet, Högenergifysik Loyola Univ Chicago, Dept Phys, Chicago, IL 60660 USA Harvard Univ, Dept Phys, Cambridge, MA 02138 USA;Harvard Univ, Lab Particle Phys & Cosmol, Cambridge, MA 02138 USA Physical Review D : covering particles, fields, gravitation, and cosmology, 2470-0010, 2022, 106:2, orcid:0000-0001-8588-7306 orcid:0000-0003-1276-676x orcid:0000-0001-5998-2553 orcid:0000-0001-7751-4489 orcid:0000-0003-1882-8802 orcid:0000-0002-2084-5866 orcid:0000-0001-5397-6777 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-493914 doi:10.1103/PhysRevD.106.022005 ISI:000898670000002 info:eu-repo/semantics/openAccess Astronomy Astrophysics and Cosmology Astronomi astrofysik och kosmologi Article in journal info:eu-repo/semantics/article text 2022 ftuppsalauniv https://doi.org/10.1103/PhysRevD.106.022005 2023-02-23T22:01:26Z The sources of the majority of the high-energy astrophysical neutrinos observed with the IceCube neutrino telescope at the South Pole are unknown. So far, only a flaring gamma-ray blazar was compellingly associated with the emission of high-energy neutrinos. However, several studies suggest that the neutrino emission from the gamma-ray blazar population only accounts for a small fraction of the total astrophysical neutrino flux. In this work we probe the production of high-energy neutrinos in the cores of active galactic nuclei (AGN), induced by accelerated cosmic rays in the accretion disk region. We present a likelihood analysis based on eight years of IceCube data, searching for a cumulative neutrino signal from three AGN samples created for this work. The neutrino emission is assumed to be proportional to the accretion disk luminosity estimated from the soft x-ray flux. Next to the observed soft x-ray flux, the objects for the three samples have been selected based on their radio emission and infrared color properties. For the largest sample in this search, an excess of high-energy neutrino events with respect to an isotropic background of atmospheric and astrophysical neutrinos is found, corresponding to a post-trial significance of 2.60 sigma. If interpreted as a genuine signal with the assumptions of a proportionality of x-ray and neutrino fluxes and a model for the subthreshold flux distribution, then this observation implies that at 100 TeV, 27%-100% of the observed neutrinos arise from particle acceleration in the core of AGN at 1 sigma confidence interval. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.106.022005 Article in Journal/Newspaper South pole Uppsala University: Publications (DiVA) South Pole Physical Review D 106 2 |
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Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Astronomy Astrophysics and Cosmology Astronomi astrofysik och kosmologi |
spellingShingle |
Astronomy Astrophysics and Cosmology Astronomi astrofysik och kosmologi Abbasi, R. Botner, Olga Burgman, Alexander Glaser, Christian Hallgren, Allan O'Sullivan, Erin Pérez de los Heros, Carlos Sharma, Ankur Valtonen-Mattila, Nora Zhelnin, P. Search for neutrino emission from cores of active galactic nuclei |
topic_facet |
Astronomy Astrophysics and Cosmology Astronomi astrofysik och kosmologi |
description |
The sources of the majority of the high-energy astrophysical neutrinos observed with the IceCube neutrino telescope at the South Pole are unknown. So far, only a flaring gamma-ray blazar was compellingly associated with the emission of high-energy neutrinos. However, several studies suggest that the neutrino emission from the gamma-ray blazar population only accounts for a small fraction of the total astrophysical neutrino flux. In this work we probe the production of high-energy neutrinos in the cores of active galactic nuclei (AGN), induced by accelerated cosmic rays in the accretion disk region. We present a likelihood analysis based on eight years of IceCube data, searching for a cumulative neutrino signal from three AGN samples created for this work. The neutrino emission is assumed to be proportional to the accretion disk luminosity estimated from the soft x-ray flux. Next to the observed soft x-ray flux, the objects for the three samples have been selected based on their radio emission and infrared color properties. For the largest sample in this search, an excess of high-energy neutrino events with respect to an isotropic background of atmospheric and astrophysical neutrinos is found, corresponding to a post-trial significance of 2.60 sigma. If interpreted as a genuine signal with the assumptions of a proportionality of x-ray and neutrino fluxes and a model for the subthreshold flux distribution, then this observation implies that at 100 TeV, 27%-100% of the observed neutrinos arise from particle acceleration in the core of AGN at 1 sigma confidence interval. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.106.022005 |
format |
Article in Journal/Newspaper |
author |
Abbasi, R. Botner, Olga Burgman, Alexander Glaser, Christian Hallgren, Allan O'Sullivan, Erin Pérez de los Heros, Carlos Sharma, Ankur Valtonen-Mattila, Nora Zhelnin, P. |
author_facet |
Abbasi, R. Botner, Olga Burgman, Alexander Glaser, Christian Hallgren, Allan O'Sullivan, Erin Pérez de los Heros, Carlos Sharma, Ankur Valtonen-Mattila, Nora Zhelnin, P. |
author_sort |
Abbasi, R. |
title |
Search for neutrino emission from cores of active galactic nuclei |
title_short |
Search for neutrino emission from cores of active galactic nuclei |
title_full |
Search for neutrino emission from cores of active galactic nuclei |
title_fullStr |
Search for neutrino emission from cores of active galactic nuclei |
title_full_unstemmed |
Search for neutrino emission from cores of active galactic nuclei |
title_sort |
search for neutrino emission from cores of active galactic nuclei |
publisher |
Uppsala universitet, Högenergifysik |
publishDate |
2022 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-493914 https://doi.org/10.1103/PhysRevD.106.022005 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
Physical Review D : covering particles, fields, gravitation, and cosmology, 2470-0010, 2022, 106:2, orcid:0000-0001-8588-7306 orcid:0000-0003-1276-676x orcid:0000-0001-5998-2553 orcid:0000-0001-7751-4489 orcid:0000-0003-1882-8802 orcid:0000-0002-2084-5866 orcid:0000-0001-5397-6777 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-493914 doi:10.1103/PhysRevD.106.022005 ISI:000898670000002 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1103/PhysRevD.106.022005 |
container_title |
Physical Review D |
container_volume |
106 |
container_issue |
2 |
_version_ |
1766202646408986624 |