Zobrazeno 1 - 10
of 5 086
pro vyhledávání: '"dark matter: halo"'
Autor:
Przemek Mróz, Andrzej Udalski, Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Radosław Poleski, Jan Skowron, Krzysztof Ulaczyk, Mariusz Gromadzki, Krzysztof Rybicki, Patryk Iwanek, Marcin Wrona, Mateusz J. Mróz
Publikováno v:
The Astrophysical Journal Letters, Vol 976, Iss 1, p L19 (2024)
Observations of the Galactic bulge revealed an excess of short-timescale gravitational microlensing events that are generally attributed to a large population of free-floating or wide-orbit exoplanets. However, in recent years, some authors suggested
Externí odkaz:
https://doaj.org/article/94df4d066b254ed992f46118a0d4b17a
Publikováno v:
The Astrophysical Journal Letters, Vol 973, Iss 1, p L6 (2024)
We explore the 511 keV emission associated with sub-GeV dark matter (DM) particles that can produce electron–positron pairs and form positronium after thermalizing. We use ∼16 yr of data from the Spectrometer on INTEGRAL to constrain DM propertie
Externí odkaz:
https://doaj.org/article/c99c53082de1498e918024adc2878f20
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 2, p 189 (2024)
Dark matter (DM) bars that shadow stellar bars have been previously shown to form in idealized simulations of isolated disk galaxies, but have yet to be studied in a fully cosmological context. In this work, we analyze a population of disk galaxies w
Externí odkaz:
https://doaj.org/article/20603d14b2044c10a220f2638dc713f3
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 135 (2024)
The dark matter subhalos orbiting in a galactic halo perturb the orbits of stars in thin stellar streams. Over time, the random velocities in the streams develop non-Gaussian wings. The rate of velocity increase is approximately a random walk at a ra
Externí odkaz:
https://doaj.org/article/1564a3d1cdd94fb783934b5c754fbee1
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
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 28 (2024)
Previous studies have revealed that the Galactic warp is a long-lived, nonsteady, and asymmetric structure. There is a need for a model that accounts for the warp’s long-term evolution. Given that this structure has persisted for over 5 Gyr, its ti
Externí odkaz:
https://doaj.org/article/d430d0be94ec437698ed792089c64722
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 79 (2024)
We present Milky Way-est, a suite of 20 cosmological cold-dark-matter-only zoom-in simulations of Milky Way (MW)-like host halos. Milky Way-est hosts are selected such that they (i) are consistent with the MW’s measured halo mass and concentration,
Externí odkaz:
https://doaj.org/article/317bbbfada6042b187acbe852ee6919c
Autor:
Przemek Mróz, Andrzej Udalski, Michał K. Szymański, Mateusz Kapusta, Igor Soszyński, Łukasz Wyrzykowski, Paweł Pietrukowicz, Szymon Kozłowski, Radosław Poleski, Jan Skowron, Dorota Skowron, Krzysztof Ulaczyk, Mariusz Gromadzki, Krzysztof Rybicki, Patryk Iwanek, Marcin Wrona, Milena Ratajczak
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 273, Iss 1, p 4 (2024)
Measurements of the microlensing optical depth and event rate toward the Large Magellanic Cloud (LMC) can be used to probe the distribution and mass function of compact objects in the direction toward that galaxy—in the Milky Way disk, the Milky Wa
Externí odkaz:
https://doaj.org/article/dc775ffafed643b7af2e124ad3d81d20
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 1, p 52 (2024)
We report the results of the CO J = 1–0 and SiO J = 2–1 mapping observations toward the broad-velocity-width molecular feature (BVF) CO 16.134–0.553 with the Nobeyama Radio Observatory 45 m telescope. The high-quality CO map shows that the 5 pc
Externí odkaz:
https://doaj.org/article/5c98126dcab44a6e9a1df3550f98e668
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