Results 21 to 30 of about 2,153,493 (386)
Are there thin accretion disks? [PDF]
, 2004 Total and internal energy requirements set constraints on the allowable temperature on the disk. In a gas pressure dominated disk, they lead to a cooling rate that decreases with temperature. These findings are used to show that the flow is mildly supersonic, with the azimuthal Mach number moderately exceeding one in a large extent of the disk. Only in
Cesar Meirelles Filho +2 more
openalex +3 more sources
Shadows and rings of the Kehagias-Sfetsos black hole surrounded by thin disk accretion [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 In this paper, under the illumination of thin disk accretion, we have employed the ray-tracing method to carefully investigate shadows and rings of the Kehagias-Sfetsos(KS) black hole in deformed Hořava-Lifshitz(HL) gravity.
Guo-Ping Li, Ke-Jian He
semanticscholar +1 more source
Hot-mode accretion and the physics of thin-disk galaxy formation [PDF]
Monthly notices of the Royal Astronomical Society, 2022 We use FIRE simulations to study disk formation in z ∼ 0, Milky Way-mass galaxies, and conclude that a key ingredient for the formation of thin stellar disks is the ability for accreting gas to develop an aligned angular momentum distribution via ...
Zachary Hafen +18 more
semanticscholar +1 more source
Observable characteristics of the charged black hole surrounded by thin disk accretion in Rastall gravity [PDF]
Classical and quantum gravity, 2022 The observable characteristics of the charged black hole (BH) surrounded by a thin disk accretion are investigated in the Rastall gravity. We found that the radii of the direct emission, lensing ring, and photon ring dramatically increased as the ...
Sen Guo, Guan-Ru Li, Enwei Liang
semanticscholar +1 more source
The Flattening Metallicity Gradient in the Milky Way’s Thin Disk [PDF]
Astrophysical Journal, 2021 We calculate the ages, orbits and phase-space coordinates for a sample of ∼4 million LAMOST and Gaia stars. The ages are cross-matched and compared with values from two other popular age catalogs, which derive the ages using different methods.
John J. Vickers, Juntai Shen, Zhao-Yu Li
semanticscholar +1 more source
On theα-element gradients of the Galactic thin disk using Cepheids [PDF]
, 2015 We present new homogeneous measurements of Na, Al, and three α-elements (Mg, Si, Ca) for 75 Galactic Cepheids. The abundances are based on high spectral resolution (R~ 38 000) and high signal-to-noise ratio (S/N ~ 50−300) spectra collected with UVES at ...
K. Genovali +18 more
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Image of a Kerr-Melvin black hole with a thin accretion disk [PDF]
Physical Review D, 2022 In this present work, we study the observational appearance of Kerr-Melvin black hole (KMBH) illuminated by an accretion disk. The accretion disk is assumed to be located on the equatorial plane and be thin both geometrically and optically.
Yehui Hou +4 more
semanticscholar +1 more source
Fluorescence Radiation and Thermal Effect at the Edge of the Disk-Shaped Laser Crystal
International Journal of Optics, 2022 The fluorescence radiation property at the edge of the thin disk crystal is very important to the design of thin disk lasers. In order to study this effect, in this paper, we established a theoretical model to describe the edge fluorescence radiation ...
Yongqian Chen +5 more
doaj +1 more source
High-efficiency 100-W Kerr-lens mode-locked Yb:YAG thin-disk oscillator
Frontiers in Physics, 2023 We demonstrate a Kerr-lens mode-locked femtosecond Yb:YAG thin-disk oscillator and investigate the approach to increase the optical-to-optical efficiency based on the scheme of direct multiple passes of the laser beam through the thin-disk medium.
Hongshan Chen +13 more
doaj +1 more source
Vertical Density Distribution of the Galaxy from Star Count Analysis [PDF]
Journal of Astronomy and Space Sciences, 2002 The five space density distribution D(z) with distance perpendicular to the Galactic plane were combined. The scale heights and the local densities at z = 0 of the thin disk, thick disk, and the halo components were estimated from the nonlinear least ...
Young-Jong Sohn
doaj +1 more source