Results 21 to 30 of about 225,051 (342)
The Physical Thickness of Stellar Disks to z ∼ 2
The Astrophysical Journal, 2023 In local disk galaxies such as our Milky Way, older stars generally inhabit a thicker disk than their younger counterparts. Two competing models have attempted to explain this result: one in which stars first form in thin disks that gradually thicken ...
Kathleen A. Hamilton-Campos +4 more
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KINEMATICAL AND CHEMICAL VERTICAL STRUCTURE OF THE GALACTIC THICK DISK. I. THICK DISK KINEMATICS, [PDF]
The Astrophysical Journal, 2012 Accepted for publication in ...
C. Moni Bidin +2 more
openaire +3 more sources
THE MAGNESIUM ABUNDANCE IN THE THIN AND THICK DISK OF THE GALAXY
Odessa Astronomical Publications, 2017 The chemical evolution of the thin and thick disk of our Galaxy was investigated in framework of the opened model with gas inflow. It was supposed that the thin and thick disks separate chemically and spatially and have different evolution timescales ...
T. V. Nykytyuk, T. V. Mishenina
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High-resolution Chemical Abundances of the Nyx Stream
The Astrophysical Journal, 2023 Nyx is a nearby, prograde, and high-eccentricity stellar stream physically contained in the thick disk, but its origin is unknown. Nyx could be the remnant of a disrupted dwarf galaxy, in which case the associated dark matter substructure could affect ...
Shuyu Wang +7 more
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Thick disks of lenticular galaxies [PDF]
Astronomy & Astrophysics, 2004 Thick disks are faint and extended stellar components found around several disk galaxies including our Milky Way. The Milky Way thick disk, the only one studied in detail, contains mostly old disk stars (≈ 10 Gyr), so that thick disks are likely to trace the early stages of disk evolution.
M. Pohlen +3 more
openaire +3 more sources
Radial Structure in the TW Hya Circumstellar Disk [PDF]
, 2011 We present new near-infrared interferometric data from the CHARA array and the Keck Interferometer on the circumstellar disk of the young star, TW Hya, a proposed "transition disk." We use these data, as well as previously published, spatially resolved ...
Akeson, R. L. +10 more
core +2 more sources
The Astrophysical Journal, 2023 The Imaging X-ray Polarimetry Explorer, launched in 2021 December, enables precision measurements of the energy-dependent polarization of the X-ray emission from stellar mass and supermassive black holes.
Andrew Thomas West, Henric Krawczynski
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Indian Journal of Ophthalmology, 2022 A 65-year-old male with proliferative diabetic retinopathy (PDR) and non-clearing vitreous hemorrhage underwent 25G pars plana vitrectomy (PPV). A large disk of thick organized blood of 5 disk diameter (DD) size was encountered in subhyaloid space.
Deependra V Singh +3 more
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The Astrophysical Journal, 2023 We explore reprocessing models for a sample of 17 hypervariable quasars, taken from the Sloan Digital Sky Survey Reverberation Mapping project, which all show coordinated optical luminosity hypervariability with amplitudes of factors ≳2 between 2014 and ...
Tatsuya Akiba +7 more
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The Chemical Evolution of the Galaxy: the two-infall model [PDF]
, 1996 In this paper we present a new chemical evolution model for the Galaxy which assumes two main infall episodes for the formation of halo-thick disk and thin disk, respectively. We do not try to take into account explicitly the evolution of the halo but we
C. +5 more
core +2 more sources