搜索结果: 1-13 共查到“天文学 soft”相关记录13条 . 查询时间(4.016 秒)
Numerically simulating impact disruptions of cohesive glass bead agglomerates using the soft-sphere discrete element method
Asteroids, Surfaces Collisional physics Geological processes Regoliths
2015/12/25
We present our implementation of cohesion in the parallel N-body code pkdgrav in order to model small bodies that are not fully monolithic but that have at least some degree of cohesion. Small bodies ...
An implementation of the soft-sphere discrete element method in a high-performance parallel gravity tree-code
Bulk solids Solar system DEM Hopper SSDEM
2015/12/25
We present our implementation of the soft-sphere discrete element method (SSDEM) in the parallel gravitational N-body code pkdgrav, a well-tested simulation package that has been used to provide many ...
Simulation of soft X-ray emission lines from the missing baryons
theory diff use radiation large-scale structure of universe
2014/12/24
We study the soft X-ray emission (0.1-1 keV) from the warm-hot intergalactic medium (WHIM) in a hydrodynamic simulation of a cold dark matter universe. Our main goal is to investigate how such emissio...
Energy spectra of the soft X-ray diffuse emission in fourteen fields observed with Suzaku
disk halo
2014/12/23
Energy spectra of the soft X-ray diffuse emission in fourteen fields observed with Suzaku.
Intrinsic disc emission and the Soft X-ray Excess in AGN
X-rays: accretion discs black hole physics
2011/10/18
Narrow Line Seyfert 1 (NLS1) galaxies have low mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should peak in the EUV. However, the ...
X-ray spectroscopy of Abell S1101 with Chandra, XMM-Newton and ROSAT: band-pass dependence of he temperature profile and soft excess emission
X-ray spectroscopy Chandra band-pass dependence temperature profile soft excess emission
2011/9/28
We present spatially-resolved spectroscopy of the galaxy cluster Abell S1101, also known as Sersic 159-03, with Chandra, XMM-Newton and ROSAT, and investigate the presence of soft X-ray excess emissio...
Multiwavelength campaign on Mrk 509. IV. Optical-UV-X-ray variability and the nature of the soft X-ray excess
galaxies: active – galaxies: nuclei – galaxies: Seyfert – quasars: individual: Mrk 509 – X-rays: galaxies
2011/9/27
We present the analysis of XMM-Newton and Swift optical-UV and X-ray observations of the Seyfert-1/QSO Mrk 509, part of an unprecedented multi-wavelength campaign, investigating the nuclear environmen...
Soft Gamma-ray Detector for the ASTRO-H Mission
Soft Gamma-ray Detector the ASTRO-H Mission
2011/1/10
ASTRO-H is the next generation JAXA X-ray satellite, intended to carry instruments with broad energy coverage and exquisite energy resolution. The Soft Gamma-ray Detector (SGD) is one of ASTRO-H instr...
A low-magnetic-field Soft Gamma Repeater
High Energy Astrophysical Phenomena (astro-ph.HE) Galaxy Astrophysics (astro-ph.GA)
2011/1/4
Soft gamma repeaters and anomalous x-ray pulsars form a rapidly increasing group of x-ray sources exhibiting sporadic emission of short bursts. They are believed to be magnetars, i.e. neutron stars po...
Photostability of gas- and solid-phase biomolecules within dense molecular clouds due to soft X-rays
2010/12/28
An experimental photochemistry study involving gas- and solid-phase amino acids (glycine, DL-valine, DL-proline) and nucleobases (adenine and uracil) under soft X-rays was performed. The aim was to te...
The big blue bump and soft X-ray excess of individual quasars
big blue bump individual quasars soft X-ray excess
2009/7/9
The big blue bump and soft X-ray excess of individual quasars。
Soft X-ray Variability of the Bright Quasar 3C273
individual (3C273) quasar—X-rays galaxies
2009/5/20
We present the results from ROSAT observations of 3C273
in the soft X-ray band. The light variation of 3C273 was investigated for
three different energy bands of soft, medium, and hard. The maximum
...
Fast Transition between High-soft and Low-soft States in GRS 1915 C 105：Evidence for a Critically Viscous Accretion Flow
accretion discs binaries black hole X-rays
2009/5/19
We present the results of a detailed analysis of RXTE observations
of class ! (Klein-Wolt et al. 2002) which show an unusual state
transition between high-soft and low-soft states in the Galactic mi...