Deep Optical Follow-up Observations to IceCube Cosmic Neutrinos: a case for IC230724A with Subaru/HSC and prospects with Rubin/LSST
Abstract
IceCube has been detecting cosmic high-energy neutrinos for more than 10 years, but their major sources are still under debate. To identify them, IceCube is issuing neutrino alerts, which enable us to perform electromagnetic follow-up observations. In this paper, we present our Subaru/HSC deep optical follow-up observations down to 25.5 mag to a well-localized neutrino event, IceCube 230724A. We conduct a dedicated analysis with extensive evaluation of background rates and true positive rates adopting the blind analysis policy to identify or disfavor tidal disruption events (TDEs) as cosmic neutrino sources. Our analysis found no TDE candidate in the region of interest. Rubin/LSST survey will enable us to constrain their fractional contribution to the cosmic high-energy neutrino background, either ≲ 60% or ≳30% for non-detection and detection, respectively, if Rubin covers the error regions of 10 neutrino events.
Related
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BibTeX
@misc{kimura2026deep,
title = {{Deep Optical Follow-up Observations to IceCube Cosmic Neutrinos: a case for IC230724A with Subaru/HSC and prospects with Rubin/LSST}},
author = {Shigeo S. Kimura and Masaomi Tanaka and Seiji Toshikage and Tomoki Morokuma and Nobuhiro Shimizu and Nozomu Tominaga and Naoki Yasuda and Yousuke Utsumi and Michitoshi Yoshida and Yasushi Fukazawa and Koji S. Kawabata},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.01158},
eprint = {2606.01158},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.01158},
}
RIS
TY - UNPB
TI - Deep Optical Follow-up Observations to IceCube Cosmic Neutrinos: a case for IC230724A with Subaru/HSC and prospects with Rubin/LSST
AU - Shigeo S. Kimura
AU - Masaomi Tanaka
AU - Seiji Toshikage
AU - Tomoki Morokuma
AU - Nobuhiro Shimizu
AU - Nozomu Tominaga
AU - Naoki Yasuda
AU - Yousuke Utsumi
AU - Michitoshi Yoshida
AU - Yasushi Fukazawa
AU - Koji S. Kawabata
PY - 2026
DA - 2026/10/31
PB - arXiv
DO - 10.48550/arxiv.2606.01158
UR - https://arxiv.org/abs/2606.01158
AB - IceCube has been detecting cosmic high-energy neutrinos for more than 10 years, but their major sources are still under debate. To identify them, IceCube is issuing neutrino alerts, which enable us to perform electromagnetic follow-up observations. In this paper, we present our Subaru/HSC deep optical follow-up observations down to 25.5 mag to a well-localized neutrino event, IceCube 230724A. We conduct a dedicated analysis with extensive evaluation of background rates and true positive rates adopting the blind analysis policy to identify or disfavor tidal disruption events (TDEs) as cosmic neutrino sources. Our analysis found no TDE candidate in the region of interest. Rubin/LSST survey will enable us to constrain their fractional contribution to the cosmic high-energy neutrino background, either ≲ 60% or ≳30% for non-detection and detection, respectively, if Rubin covers the error regions of 10 neutrino events.
ER -