Gamma-ray astronomy plays a fundamental role in the understanding of very high energy tricky and outstanding sources in our own Galaxy and their role in particle acceleration.
In this context, despite the enormous efforts done in very recent years, both theoretically and experimentally, Cosmic Ray (CR) origin remain without clear answers. Two are the hints of CR acceleration that are sought...
The observation of cosmic gamma rays is crucial for understanding high-energy astrophysical phenomena and the mechanism of cosmic-ray acceleration. We have been running the GRAINE project, a cosmic gamma-ray observation project in an energy range of 10MeV – 100GeV, using balloon-borne telescope equipped with nuclear emulsion, characterized with a high-angular resolution and polarization...
The XRISM satellite, launched in 2023, provides an X-ray spectroscopy with > 1000 resolving power around 6 keV Fe-K lines. The mission is providing numerous new insights with the high resolution spectra. On 2027, the MeV all-sky mission COSI will be launched. The mission will provide >~ 100 resolving power at 511-2 MeV. We will give the latest review of the early science results and project...
The 21 cm line emitted by neutral hydrogen (HI) atoms is a valuable observable for investigating the high redshift universe. In particular, before cosmic reionization, the universe was filled with neutral hydrogen gas. Due to cosmic expansion, the redshifted 21 cm line before the reionization is observed at frequencies below 200 MHz. Therefore, low-frequency radio observations can map HI...
The LIGO-Virgo-KAGRA collaboration is currently in its fourth observing run, having detected approximately 200 gravitational wave (GW) events. This presentation will provide an overview of GW observations since the first detection in 2015, discuss future prospects, and highlight our research on GW detector science at Nagoya University.
