Zobrazeno 1 - 10
of 295
pro vyhledávání: '"Hamidani, A."'
The recent Gamma-Ray Burst (GRB) GRB 211211A provides the earliest ($\sim 5$ h) data of a kilonova (KN) event, displaying bright ($\sim10^{42}$ erg s$^{-1}$) and blue early emission. Previously, this KN has been explained using simplistic multi-compo
Externí odkaz:
http://arxiv.org/abs/2406.14366
In gamma-ray bursts (GRBs), $\sim$ 100 - 1000 s after the prompt emission, afterglow observations have consistently shown X-ray excesses detected in the form of flares (XFs; in long GRBs) or extended emission (EEs; in short GRBs). These observations
Externí odkaz:
http://arxiv.org/abs/2405.07695
Autor:
Kawaguchi, Kyohei, Domoto, Nanae, Fujibayashi, Sho, Hayashi, Kota, Hamidani, Hamid, Shibata, Masaru, Tanaka, Masaomi, Wanajo, Shinya
We study long-term evolution of the matter ejected in a black-hole neutron-star (BH-NS) merger employing the results of a long-term numerical-relativity simulation and nucleosynthesis calculation, in which both dynamical and post-merger ejecta format
Externí odkaz:
http://arxiv.org/abs/2404.15027
Autor:
Ogino, Naoki, Arimoto, Makoto, Hamidani, Hamid, Sakamoto, Takanori, Yonetoku, Daisuke, Sawano, Tatsuya, Serino, Motoko, Asano, Katsuaki, Kawai, Nobuyuki
The detection of the short gamma-ray burst (SGRB) 050709 by the HETE-2 satellite opened a new window into understanding the nature of SGRBs, offering clues about their emission mechanism and progenitors, with the crucial aid of optical follow-up obse
Externí odkaz:
http://arxiv.org/abs/2404.02627
Some short gamma-ray bursts (SGRBs) exhibit a short duration and spectral hard emission (referred to as a "hard spike") followed by a slightly longer soft emission (known as a "soft tail"). We identified nine SGRBs with known redshift in the \textit{
Externí odkaz:
http://arxiv.org/abs/2403.10386
Follow-up observations of short gamma-ray bursts (sGRBs) have continuously unveiled late extended/plateau emissions, attributed to jet launch due to late engine activity, the nature of which remains enigmatic. Observations of GW170817 confirmed that
Externí odkaz:
http://arxiv.org/abs/2312.06286
Autor:
Oshikiri, Kakeru, Tanaka, Masaomi, Tominaga, Nozomu, Morokuma, Tomoki, Takahashi, Ichiro, Tampo, Yusuke, Hamidani, Hamid, Arima, Noriaki, Arimatsu, Ko, Kasuga, Toshihiro, Kobayashi, Naoto, Kondo, Sohei, Mori, Yuki, Niino, Yuu, Ohsawa, Ryou, Okumura, Shin-ichiro, Sako, Shigeyuki, Takahashi, Hidenori
The population of optical transients evolving within a time-scale of a few hours or a day (so-called fast optical transients, FOTs) has recently been debated extensively. In particular, our understanding of extragalactic FOTs and their rates is limit
Externí odkaz:
http://arxiv.org/abs/2310.10066
Autor:
Hamidani, Hamid, Ioka, Kunihito
In the gravitational wave event GW170817, there was a $\sim 10$ hours gap before electromagnetic (EM) observations, without detection of the cocoon. The cocoon is heated by a \textit{short} gamma-ray burst (\textit{s}GRB) jet propagating through the
Externí odkaz:
http://arxiv.org/abs/2210.02255
Autor:
Hamidani, Hamid, Ioka, Kunihito
The cocoon is an inevitable product of a jet propagating through ambient matter, and takes a fair fraction of the jet energy. In short gamma-ray bursts, the ambient matter is the ejecta from the merger of neutron stars, expanding with a high velocity
Externí odkaz:
http://arxiv.org/abs/2210.00814
Autor:
Zidi, A., Kahoul, A., Marques, J.P., Daoudi, S., Sampaio, J.M., Parente, F., Hamidani, A., Croft, S., Favalli, A., Kasri, Y., Amari, K., Berkani, B.
Publikováno v:
In Journal of Electron Spectroscopy and Related Phenomena September 2024 275