Zobrazeno 1 - 10
of 111 981
pro vyhledávání: '"A. Keiichi"'
Autor:
Iwata, Kazuya, Maeda, Keiichi
Most previous efforts for hydrodynamic studies on detonation in the context of Type Ia supernovae did not take into account the scale of the cellular structure for a criterion in initiation, propagation, quenching, and the resolution requirement of d
Externí odkaz:
http://arxiv.org/abs/2412.15580
The origin of the recombining plasma in several Galactic SNRs has been debated. A plausible mechanism would be a rapid cooling in the past, either by adiabatic or conductive process. A recent spectral study of W 49 B reported a possible charge exchan
Externí odkaz:
http://arxiv.org/abs/2412.13255
Autor:
Inoue, Yusuke, Maeda, Keiichi
Type Ibn/Icn supernovae (SNe Ibn/Icn), which are characterized by narrow helium or carbon lines originated in hydrogen-poor dense circumstellar medium (CSM), provide new insights into the final evolution of massive stars. While SNe Ibn/Icn are expect
Externí odkaz:
http://arxiv.org/abs/2412.09066
While the environment around Tycho's supernova remnant (SNR) has long been believed to be close to homogeneous, the latest analysis of Chandra data has identified a substantial deceleration of the forward shock which poses a major challenges to this
Externí odkaz:
http://arxiv.org/abs/2412.07130
Publikováno v:
The Astronomy and Astrophysics Review, 32, 5 (2024)
Over the past decades, there has been significant progress in our understanding of accreting supermassive black holes (SMBHs) that drive active galactic nuclei (AGNs), both from observational and theoretical perspectives. As an iconic target for this
Externí odkaz:
http://arxiv.org/abs/2412.07083
Autor:
Baer-Way, Raphael, Chandra, Poonam, Modjaz, Maryam, Kumar, Sahana, Pellegrino, Craig, Chevalier, Roger, Crawford, Adrian, Sarangi, Arkaprabha, Smith, Nathan, Maeda, Keiichi, Nayana, A. J., Filippenko, Alexei V., Andrews, Jennifer E., Arcavi, Iair, Bostroem, K. Azalee, Brink, Thomas G., Dong, Yize, Dwarkadas, Vikram, Farah, Joseph R., Howell, D. Andrew, Hiramatsu, Daichi, Hosseinzadeh, Griffin, McCully, Curtis, Meza, Nicolas, Newsome, Megan, Gonzalez, Estefania Padilla, Pearson, Jeniveve, Sand, David J., Shrestha, Manisha, Terreran, Giacomo, Valenti, Stefano, Wyatt, Samuel, Yang, Yi, Zheng, WeiKang
While the subclass of interacting supernovae with narrow hydrogen emission lines (SNe IIn) consists of some of the longest-lasting and brightest SNe ever discovered, their progenitors are still not well understood. Investigating SNe IIn as they emit
Externí odkaz:
http://arxiv.org/abs/2412.06914
Autor:
Miwa, Shinji, Yamamoto, Tatsuya, Nagata, Takashi, Sakamoto, Shoya, Kimura, Kenta, Shiga, Masanobu, Gao, Weiguang, Yamamoto, Hiroshi M., Inoue, Keiichi, Takenobu, Taishi, Nozaki, Takayuki, Ohto, Tatsuhiko
Chirality pervades multiple scientific domains-physics, chemistry, biology, and astronomy-and profoundly influences their foundational principles. Recently, the chirality-induced spin selectivity (CISS) phenomenon has captured significant attention i
Externí odkaz:
http://arxiv.org/abs/2412.03082
We investigated the influence of the Eddington ratio on sub-parsec-scale outflows in active galactic nuclei (AGNs) with supermassive black holes (SMBHs) masses of $10^7$ M$_{\odot}$ using two-dimensional radiation hydrodynamics simulations. When the
Externí odkaz:
http://arxiv.org/abs/2411.07736
Autor:
Iwata, Yuhei, Akimoto, Masanori, Matsuoka, Tomoki, Maeda, Keiichi, Yonekura, Yoshinori, Tominaga, Nozomu, Moriya, Takashi J., Fujisawa, Kenta, Niinuma, Kotaro, Yoon, Sung-Chul, Lee, Jae-Joon, Jung, Taehyun, Byun, Do-Young
We report on radio follow-up observations of the nearby Type II supernova, SN 2023ixf, spanning from 1.7 to 269.9 days after the explosion, conducted using three very long baseline interferometers (VLBIs), which are the Japanese VLBI Network (JVN), t
Externí odkaz:
http://arxiv.org/abs/2411.07542
This paper explores nucleon decay within the framework of a "fake Grand Unified Theory (GUT)" combined with the Froggatt-Nielsen (FN) mechanism. In this fake GUT framework, quarks and leptons may have distinct high-energy origins but fit into complet
Externí odkaz:
http://arxiv.org/abs/2411.05398