Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Milky Way dynamics"'
Autor:
Yang Su, Shiyu Zhang, Yan Sun, Ji Yang, Qing-Zeng Yan, Shaobo Zhang, Zhiwei Chen, Xuepeng Chen, Xin Zhou, Lixia Yuan
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L6 (2024)
We study the gas inflows toward the Galactic Central Molecular Zone (CMZ) based on the gas morphological and kinematic features from the Milky Way Imaging Scroll Painting in the region of l = 1.°2–19.°0 and ∣ b ∣ ≲ 3.°0. We find that the n
Externí odkaz:
https://doaj.org/article/f658a64fff9a482495cc72d5d3845c47
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 1, p L4 (2024)
We search for globular clusters (GCs) trapped in resonances with the bar of the Milky Way (MW). By integrating their orbits in a potential with a decelerating bar, we select 10 whose orbits are significantly changed by its presence. Most of these are
Externí odkaz:
https://doaj.org/article/f9ff194c19d04f3e981f4a87a32cd195
Autor:
Evan Butler, Andrea Kunder, Zdenek Prudil, Kevin R. Covey, Macy Ball, Carlos Campos, Kaylen Gollnick, Julio Olivares Carvajal, Joanne Hughes, Kathryn Devine, Christian I. Johnson, A. Katherina Vivas, R. Michael Rich, Meridith Joyce, Iulia T. Simion, Tommaso Marchetti, Andreas J. Koch-Hansen, William I. Clarkson, Rebekah Kuss
Publikováno v:
The Astrophysical Journal Letters, Vol 963, Iss 1, p L33 (2024)
Patchick 99 is a candidate globular cluster located in the direction of the Galactic bulge, with a proper motion almost identical to the field and extreme field star contamination. A recent analysis suggests it is a low-luminosity globular cluster wi
Externí odkaz:
https://doaj.org/article/79909a585b8244678aad812edb9bd4b0
Publikováno v:
The Astrophysical Journal Letters, Vol 961, Iss 1, p L4 (2024)
The phase space, as coded by kinematic parameters and chemical abundances, is crucial for understanding the formation of the Galactic disk. Using red giant stars from the Galactic thin disk with [Fe/H] > − 0.8 and low- α ratios identified in LAMOS
Externí odkaz:
https://doaj.org/article/17c9df5617c94e568f38018da1405673
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 2, p 253 (2024)
The majority of satellite galaxies around the Milky Way (MW) show disk-like distributions (the disk of satellites; DoS), which is a small-scale problem of the lambda cold dark matter cosmology. The conventional definition of the MW-like DoS is a sate
Externí odkaz:
https://doaj.org/article/6cab00dbbedf4946a9bf4b648f989d9e
Publikováno v:
The Astronomical Journal, Vol 168, Iss 6, p 277 (2024)
With Gaia, APOGEE, GALAH, and LAMOST data, we investigate the positional, kinematic, chemical, and age properties of nine moving groups in the solar neighborhood. We find that each moving group has a distinct distribution in the velocity space in ter
Externí odkaz:
https://doaj.org/article/41a4217824694deb8661268c5f28a0e1
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
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 292 (2024)
Decoding the key dynamical processes that shape the Galactic disk structure is crucial for reconstructing the Milky Way’s evolution history. The second Gaia data release unveils a novel wave pattern in the L _Z −〈 V _R 〉 space, but its format
Externí odkaz:
https://doaj.org/article/b3d0aa470f5441fcaf5632a582be1c0a
Autor:
Nicolás Garavito-Camargo, Adrian M. Price-Whelan, Jenna Samuel, Emily C. Cunningham, Ekta Patel, Andrew Wetzel, Kathryn V. Johnston, Arpit Arora, Robyn E. Sanderson, Lehman Garrison, Danny Horta
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 100 (2024)
Understanding the physical mechanism behind the formation of a corotating thin plane of satellite galaxies, like the one observed around the Milky Way (MW), has been challenging. The perturbations induced by a massive satellite galaxy, like the Large
Externí odkaz:
https://doaj.org/article/ad44784908ab44308a1bb3a62cd6cd09