Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Milky Way formation"'
Autor:
Kenji Bekki, Takuji Tsujimoto
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 1, p L1 (2024)
Recent observations have shown that [P/Fe] in the Galactic stars decreases with increasing [Fe/H] for [Fe/H] ≳ − 1 whereas it is almost subsolar for [Fe/H] ≲ −2. These [P/Fe] trends with [Fe/H] have not been well reproduced by previous theore
Externí odkaz:
https://doaj.org/article/b12a471827554cce93f02a09893be82e
Publikováno v:
The Astrophysical Journal Letters, Vol 962, Iss 2, p L26 (2024)
The initial mass function (IMF) of the first Population III (Pop III) stars remains a persistent mystery. Their predicted massive nature implies the existence of stars exploding as pair-instability supernovae (PISNe), but no observational evidence ha
Externí odkaz:
https://doaj.org/article/43b22fc4d5dc4d8eaa3f4ef0fa2977e2
Akademický článek
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Publikováno v:
The Astrophysical Journal, Vol 977, Iss 2, p 278 (2024)
The search for accreted satellites in the Galactic disk is a challenging task, to which Gaia plays a crucial role in synergy with ground-based spectroscopic surveys. In 2021, P. Re Fiorentin et al. discovered five substructures with disk kinematics i
Externí odkaz:
https://doaj.org/article/a50ff4ee46064fea8d222149a74cd313
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 1, p 71 (2024)
We examined the double red clump (RC) observed in the Galactic bulge, interpreted as a difference in distance (“X-shaped bulge scenario”) or in chemical composition (“multiple population scenario”). To verify chemical differences between the
Externí odkaz:
https://doaj.org/article/ea097ede99164e9dbe6c9f551deb8aac
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 87 (2024)
Age is the most difficult fundamental stellar parameter to infer for isolated stars. While isochrone-based ages are in general imprecise for both main-sequence dwarfs and red giants, precise isochrone-based ages can be obtained for stars on the subgi
Externí odkaz:
https://doaj.org/article/d68b0bf06b024192a680427ceb5f6b14
Autor:
Hans-Walter Rix, Vedant Chandra, Gail Zasowski, Annalisa Pillepich, Sergey Khoperskov, Sofia Feltzing, Rosemary F. G. Wyse, Neige Frankel, Danny Horta, Juna Kollmeier, Keivan Stassun, Melissa K. Ness, Jonathan C. Bird, David Nidever, José G. Fernández-Trincado, João A. S. Amarante, Chervin F. P. Laporte, Jianhui Lian
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 293 (2024)
We show with Gaia XP spectroscopy that extremely metal-rich (EMR) stars in the Milky Way ([M/H] _XP ≳ 0.5) are largely confined to a tight “knot” at the center of the Galaxy. This EMR knot is round in projection, has a fairly abrupt edge near R
Externí odkaz:
https://doaj.org/article/a18c491e0dfb4a35a48483212e4cc7b9
Autor:
Vedant Chandra, Vadim A. Semenov, Hans-Walter Rix, Charlie Conroy, Ana Bonaca, Rohan P. Naidu, René Andrae, Jiadong Li, Lars Hernquist
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 112 (2024)
We illustrate the formation and evolution of the Milky Way over cosmic time, utilizing a sample of 10 million red giant stars with full chemodynamical information, including metallicities and α -abundances from low-resolution Gaia XP spectra. The ev
Externí odkaz:
https://doaj.org/article/83122b0b51084aa685f143e220a14e94
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 1, p 34 (2024)
Both simulations and observations suggest that the disk assembly of galaxies is governed by the interplay between coplanar gas inflow, ex-planar gas outflow, and in situ star formation on the disk, known as the leaky accretion disk. This scenario pre
Externí odkaz:
https://doaj.org/article/323abe0515af43d6beeb98996e3eed2c
Autor:
Jihye Hong, Timothy C. Beers, Young Sun Lee, Yang Huang, Yutaka Hirai, Jonathan Cabrera Garcia, Derek Shank, Shuai Xu, Haibo Yuan, Mohammad K. Mardini, Thomas Catapano, Gang Zhao, Zhou Fan, Jie Zheng, Wei Wang, Kefeng Tan, Jingkun Zhao, Chun Li
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 273, Iss 1, p 12 (2024)
Photometric stellar surveys now cover a large fraction of the sky, probe to fainter magnitudes than large-scale spectroscopic surveys, and are relatively free from the target selection biases often associated with such studies. Photometric-metallicit
Externí odkaz:
https://doaj.org/article/59f813e9f7da436c9480c01d24f83f27