activity
20242026
most citedLittle Red Dots as Hidden Neutrino Sources

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astro-ph.HE2025

Microquasar jet-cocoon systems as PeVatrons

B. Theodore Zhang, Shigeo S. Kimura, Kohta Murase

The origin of Galactic cosmic rays (CRs), particularly around the knee region (3 PeV), remains a major unsolved question. Recent observations by LHAAASO suggest that the knee…

astro-ph.HE2025

Electromagnetic signatures from pulsar remnants of binary neutron star mergers: prospects for unique identification using multi-wavelength signatures

Mainak Mukhopadhyay, Shigeo S. Kimura

Binary neutron star (BNS) mergers can result in the formation of long-lived magnetar remnants which can enhance neutrino and electromagnetic (EM) emissions. In this work, we study…

astro-ph.HE2025

High-energy neutrino signatures from pulsar remnants of binary neutron-star mergers: coincident detection prospects with gravitational waves

Mainak Mukhopadhyay, Shigeo S. Kimura, Brian D. Metzger

Binary neutron-star (BNS) mergers are accompanied by multi-messenger emissions, including gravitational wave (GW), neutrino, and electromagnetic signals. Some fraction of BNS merge…

astro-ph.HE2025

Ultrahigh-energy neutrino searches using next-generation gravitational wave detectors at radio neutrino detectors: GRAND, IceCube-Gen2 Radio, and RNO-G

Mainak Mukhopadhyay, Kumiko Kotera, Stephanie Wissel +2

Binary neutron star (BNS) mergers can be sources of ultrahigh-energy (UHE) cosmic rays and potential emitters of UHE neutrinos. The upcoming and current radio neutrino detectors li…

astro-ph.HE2025

Detection Prospects of Electromagnetic Signatures from OGLE-2011-BLG-0462

Shigeo S. Kimura, Lena Murchikova, Kailash C. Sahu

Stellar-mass isolated black holes (IsoBHs) wandering in interstellar medium (ISM) are expected to be abundant in our Galaxy. Recently, an IsoBH, OGLE-2011-BLG-0462, was unambiguous…

astro-ph.SR2025

Formation and Early Evolution of Protoplanetary Disks under Nonuniform Cosmic-Ray Ionization

Erika Nishio, Kengo Tomida, Yuki Kudoh +1

Angular momentum transport by magnetic fields is important for formation and evolution of protoplanetary disks. The effects of magnetic fields are suppressed due to non-ideal magne…