Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Galaxy stellar halos"'
Publikováno v:
The Astrophysical Journal Letters, Vol 971, Iss 2, p L36 (2024)
Using numerical simulations of a barred disk galaxy embedded in nonspinning and spinning dark matter (DM) halos, we present a novel mechanism of “cooling” the vertical oscillations of DM particles, which acquire disk kinematics. The underlying me
Externí odkaz:
https://doaj.org/article/35eeb2e073ff47ed8b0b9d428bd3d95e
Autor:
Benjamin N. Velguth, Eric F. Bell, Adam Smercina, Paul Price, Katya Gozman, Antonela Monachesi, Richard D’Souza, Jeremy Bailin, Roelof S. de Jong, In Sung Jang, Colin T. Slater
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 189 (2024)
Mergers of and interactions between galaxies imprint a wide diversity of morphological, dynamical, and chemical characteristics in stellar halos and tidal streams. Measuring these characteristics elucidates aspects of the progenitors of the galaxies
Externí odkaz:
https://doaj.org/article/b6fea78803174f2e9ae9d9b02b558441
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 70 (2024)
The escape velocity profile of the Milky Way offers a crucial and independent measurement of its underlying mass distribution and dark matter (DM) properties. Using a sample of stars from the third data release of Gaia with 6D kinematics and strict q
Externí odkaz:
https://doaj.org/article/20f595b7cc4e443abd04fdf9094d63ad
Autor:
Itsuki Ogami, Yutaka Komiyama, Masashi Chiba, Mikito Tanaka, Puragra Guhathakurta, Evan N. Kirby, Rosemary F. G. Wyse, Carrie Filion, Takanobu Kirihara, Miho N. Ishigaki, Kohei Hayashi
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 107 (2024)
We analyze the outer regions of M33, beyond 15 kpc in projected distance from its center, using Subaru/Hyper Suprime-Cam multicolor imaging. We identify red giant branch (RGB) stars and red clump (RC) stars using the surface-gravity-sensitive NB515 f
Externí odkaz:
https://doaj.org/article/438a99fcbe224c05bd762c59f366fac6
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 2, p 186 (2024)
Low-surface-brightness galaxies are excellent laboratories, where stars and baryonic matter act as tracers of the gravitational potential of the dark matter halo. If dark matter is modeled as a perfect fluid, then spherically symmetric and static dar
Externí odkaz:
https://doaj.org/article/385751ff570147a9963398d2a2171cae
Autor:
Anna C. Wright, Jason Tumlinson, Molly S. Peeples, Brian W. O’Shea, Cassandra Lochhaas, Lauren Corlies, Britton D. Smith, Nguyen Binh, Ramona Augustin, Raymond C. Simons
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 1, p 70 (2024)
Over the next decade, the astronomical community will be commissioning multiple wide-field observatories well suited for studying stellar halos in both integrated light and resolved stars. In preparation for this, we use five high-resolution cosmolog
Externí odkaz:
https://doaj.org/article/54e03a67377c4634a28f5c11d6165905
Autor:
Dennis Zaritsky, Giulia Golini, Richard Donnerstein, Ignacio Trujillo, Mohammad Akhlaghi, Nushkia Chamba, Mauro D’Onofrio, Sepideh Eskandarlou, S. Zahra Hosseini-ShahiSavandi, Raúl Infante-Sainz, Garreth Martin, Mireia Montes, Javier Román, Nafise Sedighi, Zahra Sharbaf
Publikováno v:
The Astronomical Journal, Vol 168, Iss 2, p 69 (2024)
We present an overview of the LBT Imaging of Galactic Halos and Tidal Structures survey, which currently includes 25 nearby galaxies that are on average ∼1 mag fainter than the Milky Way, and a catalog of 54 low central surface brightness (24 < μ
Externí odkaz:
https://doaj.org/article/6260ad6bc30c41b6b50aa186d10dbc5a
Autor:
Charlie Conroy, Benjamin D. Johnson, Pieter van Dokkum, Alis Deason, Sandro Tacchella, Sirio Belli, William P. Bowman, Rohan P. Naidu, Minjung Park, Roberto Abraham, Razieh Emami
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 129 (2024)
We report the serendipitous discovery of an extended stellar halo surrounding the low-mass galaxy Ark 227 ( M _* = 5 × 10 ^9 M _⊙ ; d = 35 Mpc) in deep JWST NIRCam imaging from the Blue Jay Survey. The F200W–F444W color provides robust star–ga
Externí odkaz:
https://doaj.org/article/ceee34cedda0412b80f8327e1c7f2e07
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 62 (2024)
Based on the LAMOST DR9 Medium Resolution Spectra (MRS) catalog, combined with astrometries from Gaia DR3, we conducted an investigation into the substructures in the stellar halo to obtain their chemical and kinematic information. We employed the HD
Externí odkaz:
https://doaj.org/article/3d5788e80ed24feaa9fe408c72241ed2
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 2, p 162 (2024)
The Milky Way’s stellar halo, which extends to >100 kpc, encodes the evolutionary history of our Galaxy. However, most studies of the halo to date have been limited to within a few kiloparsecs of the Sun. Here, we characterize differences between t
Externí odkaz:
https://doaj.org/article/aeb00b3a42274e82951cf53fbb347b0e