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Nonthermal afterglow of the binary neutron star merger GW170817: a more natural modeling of electron energy distribution leads to a qualitatively different new solution
Haoxiang Lin, Tomonori Totani, Kenta Kiuchi
The observed nonthermal afterglow spectrum of the binary neutron star (BNS) merger GW170817 from radio to X-ray are consistent with synchrotron radiation by shock-accelerated elect…
Optical follow-up observation of Fast Radio Burst 151230
Nozomu Tominaga, Yuu Niino, Tomonori Totani +9
The origin of fast radio bursts (FRBs), bright millisecond radio transients, is still somewhat of a mystery. Several theoretical models expect that the FRB accompanies an optical a…
Diffuse x-ray emission from the northern arc of loop I observed with suzaku
Masahiro Akita, Jun Kataoka, Makoto Arimoto +4
After discovery of the Fermi bubbles, giant structures observed in radio to X-rays have been discussed as possi- ble evidence of past activities in the Galactic Center (GC). We rep…
A search for optical transients associated with Fast Radio Burst 150418
Yuu Niino, Nozomu Tominaga, Tomonori Totani +5
We have searched for optical variability in the host galaxy of the radio variable source which is possibly associated with fast radio burst (FRB) 150418. We compare images of the g…
Lethal radiation from nearby supernovae helps to explain the small cosmological constant
Tomonori Totani, Hidetoshi Omiya, Takahiro Sudoh +2
The observed value of the cosmological constant is extremely smaller than theoretical expectations, and the anthropic argument has been proposed as a solution to…
X-ray and Gamma-ray Observations of the Fermi Bubbles and NPS/Loop I Structures
Jun Kataoka, Yoshiaki Sofue, Yoshiyuki Inoue +3
The Fermi bubbles were possibly created by large injections of energy into the Galactic Center (GC), either by an active galactic nucleus (AGN) or by nuclear starburst more than ~1…
High-energy gamma-ray and neutrino production in star-forming galaxies across cosmic time: Difficulties in explaining the IceCube data
Takahiro Sudoh, Tomonori Totani, Norita Kawanaka
We present a new theoretical modeling to predict luminosity and spectrum of gamma-ray and neutrino emission of a star-forming galaxy, from star formation rate (), gas mass ($M_{…
X-ray Detectability of Accreting Isolated Black Holes in Our Galaxy
Daichi Tsuna, Norita Kawanaka, Tomonori Totani
Detectability of isolated black holes (IBHs) without a companion star but emitting X-rays by accretion from dense interstellar medium (ISM) or molecular cloud gas is investigated.…