Zobrazeno 1 - 10
of 793
pro vyhledávání: '"Nomoto, Ken'Ichi"'
Autor:
Nakane, Minami, Ouchi, Masami, Nakajima, Kimihiko, Harikane, Yuichi, Tominaga, Nozomu, Takahashi, Koh, Kashino, Daichi, Yanagisawa, Hiroto, Watanabe, Kuria, Nomoto, Ken'ichi, Isobe, Yuki, Nishigaki, Moka, Ishigaki, Miho N., Ono, Yoshiaki, Takeda, Yui
We present an [O/Fe] ratio of a luminous galaxy GN-z11 at $z=10.60$ derived with the deep public JWST/NIRSpec data. We fit the medium-resolution grating (G140M, G235M, and G395M) data with the model spectra consisting of BPASS-stellar and CLOUDY-nebu
Externí odkaz:
http://arxiv.org/abs/2407.14470
Autor:
Barmentloo, Stan, Jerkstrand, Anders, Iwamoto, Koichi, Hachisu, Izumi, Nomoto, Ken'ichi, Sollerman, Jesper, Woosley, Stan
Nitrogen is produced by CNO-cycling in massive stars, and can be ejected in significant amounts in supernova explosions. While in H-rich SNe, its [\ion{N}{II}] 6548, 6583 emission becomes obscured by strong H$\alpha$, in explosions of He stars, this
Externí odkaz:
http://arxiv.org/abs/2403.08911
Autor:
Leung, Shing-Chi, Nomoto, Ken'ichi
Publikováno v:
The Astrophysical Journal 974, 310 (2024)
The spectra of several galaxies, including extremely metal-poor galaxies (EMPGs) from the EMPRESS survey, have shown that the abundances of some Si-group elements differ from "spherical" explosion models of massive stars. This leads to the speculatio
Externí odkaz:
http://arxiv.org/abs/2312.17226
According to a standard initial mass function, stars in the range 7-12 Msun constitute ~50% (by number) of the stars more massive than ~7 Msun, but, in spite of this, their evolutionary properties, and in particular their final fate, are still scarce
Externí odkaz:
http://arxiv.org/abs/2312.00107
Autor:
Watanabe, Kuria, Ouchi, Masami, Nakajima, Kimihiko, Isobe, Yuki, Tominaga, Nozomu, Suzuki, Akihiro, Ishigaki, Miho N., Nomoto, Ken'ichi, Takahashi, Koh, Harikane, Yuichi, Hatano, Shun, Kusakabe, Haruka, Moriya, Takashi J., Nishigaki, Moka, Ono, Yoshiaki, Onodera, Masato, Sugahara, Yuma
We present gas-phase elemental abundance ratios of 7 local extremely metal-poor galaxies (EMPGs) including our new Keck/LRIS spectroscopy determinations together with 33 JWST $z\sim 4-10$ star-forming galaxies in the literature, and compare chemical
Externí odkaz:
http://arxiv.org/abs/2305.02078
Publikováno v:
Astrophysical Journal 948, 80 (2023)
Rotating massive stars with initial progenitor masses $M_{\rm prog} \sim$ 25 $M_{\odot}$ -- $\sim$140 $M_{\odot}$ can leave rapidly rotating black holes to become collapsars. The black holes and the surrounding accretion disks may develop powerful je
Externí odkaz:
http://arxiv.org/abs/2304.14935
Autor:
Folatelli, Gastón, Van Dyk, Schuyler D., Kuncarayakti, Hanindyo, Maeda, Keiichi, Bersten, Melina C., Nomoto, Ken’ichi, Pignata, Giuliano, Hamuy, Mario, Quimby, Robert M., Zheng, WeiKang, Filippenko, Alexei V., Clubb, Kelsey I., Smith, Nathan, Elias-Rosa, Nancy, Foley, Ryan J., Miller, Adam A.
Supernova (SN) iPTF13bvn in NGC 5806 was the first Type Ib SN to have been tentatively associated with a progenitor in pre-explosion images. We performed deep ultraviolet (UV) and optical Hubble Space Telescope observations of the SN site similar to
Externí odkaz:
http://hdl.handle.net/10150/621404
http://arizona.openrepository.com/arizona/handle/10150/621404
http://arizona.openrepository.com/arizona/handle/10150/621404
Autor:
Tsuruta, Sachiko, Kelly, Madeline J., Nomoto, Ken'ichi, Mori, Kanji, Teter, Marcus, Liebmann, Andrew C.
Magnetars, neutron stars thought to be with ultra-strong magnetic fields of $10^{14 - 15}$ G, are observed to be much hotter than ordinary pulsars with $\sim 10^{12}$ G, and additional heating sources are required. One possibility is heating by the a
Externí odkaz:
http://arxiv.org/abs/2302.10361
In unveiling the nature of the first stars, the main astronomical clue is the elemental compositions of the second generation of stars, observed as extremely metal-poor (EMP) stars, in our Milky Way Galaxy. However, no observational constraint was av
Externí odkaz:
http://arxiv.org/abs/2302.04366
Autor:
Tiwari, Vishal, Graur, Or, Fisher, Robert, Seitenzahl, Ivo, Leung, Shing-Chi, Nomoto, Ken'ichi, Perets, Hagai Binyamin, Shen, Ken
Type Ia supernovae (SNe Ia) play a crucial role as standardizable candles in measurements of the Hubble constant and dark energy. Increasing evidence points towards multiple possible explosion channels as the origin of normal SNe Ia, with possible sy
Externí odkaz:
http://arxiv.org/abs/2206.02812