Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources
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Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources. / Abbasi, R.; Ackermann, M.; Adams, J.; Ahlers, M.; Anderson, T.; Binder, G.; Bourbeau, E.; Braun, J.; Chen, C.; Dittmer, M.; Engel, R.; Evans, J.; Fischer, L.; Garcia, A.; Goldschmidt, A.; Hoffmann, R.; Jansson, M.; Jones, B. J. P.; Kang, D.; Karl, M.; Klein, S. R.; Koskinen, D. J.; Kozynets, T.; Larson, M. J.; Lee, J. W.; Li, Y.; Liu, Q. R.; Lyu, Y.; Madsen, J.; Mead, J.; Meier, M.; Park, N.; Paul, L.; Peters, L.; Plum, M.; Rameez, M.; Rehman, A.; Reusch, S.; Sarkar, S.; Sarkar, S.; Schmidt, T.; Schneider, A.; Sharma, A.; Stuttard, T.; Weiss, M. J.; Wolf, M.; Xu, X. W.; Xu, Y.; Yu, S.; Zhang, Z.; Icecube Collaboration.
In: Astrophysical Journal Letters, Vol. 920, No. 2, 45, 20.10.2021.Research output: Contribution to journal › Letter › Research › peer-review
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TY - JOUR
T1 - Search for Multi-flare Neutrino Emissions in 10 yr of IceCube Data from a Catalog of Sources
AU - Abbasi, R.
AU - Ackermann, M.
AU - Adams, J.
AU - Ahlers, M.
AU - Anderson, T.
AU - Binder, G.
AU - Bourbeau, E.
AU - Braun, J.
AU - Chen, C.
AU - Dittmer, M.
AU - Engel, R.
AU - Evans, J.
AU - Fischer, L.
AU - Garcia, A.
AU - Goldschmidt, A.
AU - Hoffmann, R.
AU - Jansson, M.
AU - Jones, B. J. P.
AU - Kang, D.
AU - Karl, M.
AU - Klein, S. R.
AU - Koskinen, D. J.
AU - Kozynets, T.
AU - Larson, M. J.
AU - Lee, J. W.
AU - Li, Y.
AU - Liu, Q. R.
AU - Lyu, Y.
AU - Madsen, J.
AU - Mead, J.
AU - Meier, M.
AU - Park, N.
AU - Paul, L.
AU - Peters, L.
AU - Plum, M.
AU - Rameez, M.
AU - Rehman, A.
AU - Reusch, S.
AU - Sarkar, S.
AU - Sarkar, S.
AU - Schmidt, T.
AU - Schneider, A.
AU - Sharma, A.
AU - Stuttard, T.
AU - Weiss, M. J.
AU - Wolf, M.
AU - Xu, X. W.
AU - Xu, Y.
AU - Yu, S.
AU - Zhang, Z.
AU - Icecube Collaboration
PY - 2021/10/20
Y1 - 2021/10/20
N2 - A recent time-integrated analysis of a catalog of 110 candidate neutrino sources revealed a cumulative neutrino excess in the data collected by IceCube between 2008 April 6 and 2018 July 10. This excess, inconsistent with the background hypothesis in the Northern Hemisphere at the 3.3 sigma level, is associated with four sources: NGC 1068, TXS 0506+056, PKS 1424+240, and GB6 J1542+6129. This Letter presents two time-dependent neutrino emission searches on the same data sample and catalog: a point-source search that looks for the most significant time-dependent source of the catalog by combining space, energy, and time information of the events, and a population test based on binomial statistics that looks for a cumulative time-dependent neutrino excess from a subset of sources. Compared to previous time-dependent searches, these analyses enable a feature to possibly find multiple flares from a single direction with an unbinned maximum-likelihood method. M87 is found to be the most significant time-dependent source of this catalog at the level of 1.7 sigma post-trial, and TXS 0506+056 is the only source for which two flares are reconstructed. The binomial test reports a cumulative time-dependent neutrino excess in the Northern Hemisphere at the level of 3.0 sigma associated with four sources: M87, TXS 0506+056, GB6 J1542+6129, and NGC 1068.
AB - A recent time-integrated analysis of a catalog of 110 candidate neutrino sources revealed a cumulative neutrino excess in the data collected by IceCube between 2008 April 6 and 2018 July 10. This excess, inconsistent with the background hypothesis in the Northern Hemisphere at the 3.3 sigma level, is associated with four sources: NGC 1068, TXS 0506+056, PKS 1424+240, and GB6 J1542+6129. This Letter presents two time-dependent neutrino emission searches on the same data sample and catalog: a point-source search that looks for the most significant time-dependent source of the catalog by combining space, energy, and time information of the events, and a population test based on binomial statistics that looks for a cumulative time-dependent neutrino excess from a subset of sources. Compared to previous time-dependent searches, these analyses enable a feature to possibly find multiple flares from a single direction with an unbinned maximum-likelihood method. M87 is found to be the most significant time-dependent source of this catalog at the level of 1.7 sigma post-trial, and TXS 0506+056 is the only source for which two flares are reconstructed. The binomial test reports a cumulative time-dependent neutrino excess in the Northern Hemisphere at the level of 3.0 sigma associated with four sources: M87, TXS 0506+056, GB6 J1542+6129, and NGC 1068.
KW - BLAZAR TXS 0506+056
KW - ASTROPHYSICAL SOURCES
KW - COINCIDENT
KW - JETS
KW - MODEL
KW - M87
U2 - 10.3847/2041-8213/ac2c7b
DO - 10.3847/2041-8213/ac2c7b
M3 - Letter
VL - 920
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - 45
ER -
ID: 284026728