搜索结果: 1-15 共查到“天体物理学 Variability”相关记录27条 . 查询时间(0.122 秒)
Variability in Blazars: Clues from PKS 2155-304
black hole physics – magnetic reconnection – relativistic processes – turbulence– galaxies: BL Lacertae objects: individual: PKS 2155-304 – galaxies: jets
2011/10/20
Rapid variability on a time scale much faster than the light-crossing time of the central supermassive black hole has been seen in TeV emission from the blazar PKS 2155-304. The most plausible explana...
Variability of the SiO thermal line emission toward the young L1448-mm outflow
Variability SiO emission L1448-mm outflow
2011/10/8
The detection of narrow SiO thermal emission toward young outflows has been proposed to be a signature of the magnetic precursor of C-shocks. Recent modeling of the SiO emission across C-shocks predic...
Optical Spectral Variability of the Very-High-Energy Gamma-Ray Blazar 1ES 1011+496
Optical Spectral Variability the Very-High-Energy Gamma-Ray Blazar 1ES 1011+496
2011/1/11
We present results of five years of optical (UBVRI) observations of the very-high-energy gamma-ray blazar 1ES 1011+496 at the MDM Observatory. We calibrated UBVRI magnitudes of five comparison stars i...
Photometric variability of the Be star CoRoT-ID 102761769
Photometric variability the Be star CoRoT-ID
2011/1/11
Classical Be stars are rapid rotators of spectral type late O to early A and luminosity class V-III, wich exhibit Balmer emission lines and often a near infrared excess originating in an equatorially ...
The Physics of Disk Winds, Jets,and X-ray Variability in GRS 1915+105
Disk Winds Jets X-ray Variability
2011/1/11
We present new insights about accretion and ejection physics based on joint RXTE/Chandra HETGS studies of rapid X-ray variability in GRS 1915+105. For the first time, with fast phase-resolved spectros...
Spectral variability of quasars from multi-epoch photometric data in the Sloan Digital Sky Survey Stripe 82
Spectral variability multi-epoch photometric data
2011/1/11
We present a new approach to analysing the dependence of quasar variability on rest-frame wavelengths. We exploited the spectral archive of the Sloan Digital Sky Survey (SDSS) to create a sample of mo...
The Wide Field X-ray Telescope (WFXT) is a proposed mission with a high survey speed, due to the combination of large field of view (FOV) and effective area, i.e. grasp, and sharp PSF across the whole...
Spectrophotometric variability of the magnetic CP star 56 Arietis in spectral region from 1950 to 3200 A
stars chemically peculiar – stars individual 56 Ari – stars variables: other
2010/11/11
The spectrophotometric variability of the magnetic CP star 56 Arietis (56 Ari) in the ultraviolet spectral region from 1950 to 3200 °A is investigated.This study is based on the archival International...
Optical variability of the ultraluminous X-ray source NGC 1313 X-2
stars individual (NGC 1313 X-2) – X-rays binaries – X-rays individuals (NGC 1313 X-2)
2010/11/12
We analyzed the longest phase-connected photometric dataset available for NGC 1313 X-2,looking for the 6 day modulation reported by Liu et al. (2009). The folded B band light curve shows a 6 days per...
From pre- to young Planetary Nebulae: radio continuum variability
stars AGB and post-AGB circumstellar matter – radio continuum
2010/11/10
Searching for variability, we have observed a sample of hot post-AGB stars and young Planetary Nebulae candidates with the Very Large Array at 4.8, 8.4, and 22.4 GHz.The sources had been previously de...
Discovery of a QPO in the X-ray pulsar 1A 1118-615: correlated spectral and aperiodic variability
X-rays binaries — pulsars individual 1A 1118-615
2010/11/10
Aims. Our goal is to investigate the X-ray timing and spectral variability of the high-mass X-ray binary 1A 1118-615 during a type-II outburst.
We study the expected variability patterns of blazars within the two-zone acceleration model putting special emphasis on flare shapes and spectral lags. We solve semi-analytically the kinetic equation...
Time-variability in the Interstellar Boundary Conditions of the Heliosphere over the past 60,000 years: Impact of the Solar Journey on the Galactic Cosmic Ray Flux at Earth
Time-variability the Interstellar Boundary Conditions
2011/1/10
During the solar journey through galactic space, variations in the physical properties of the surrounding interstellar material (ISM) modify the heliosphere and modulate the flux of galactic cosmic ra...
The scaling of X-ray variability with luminosity in Ultra-luminous X-ray sources
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/5
We investigated the relationship between the X-ray variability amplitude and X-ray luminosity for a sample of 14 bright Ultra-luminous X-ray sources (ULXs) with XMM-Newton/EPIC data, and compare it wi...
Variability of black-hole accretion discs: a theoretical study
Solar and Stellar Astrophysics (astro-ph.SR) Galaxy Astrophysics (astro-ph.GA)
2010/12/29
This thesis investigates phenomena occurring in black-hole accretion discs which are likely to induce high-frequency quasi-periodic variability. Two classes of pseudo-relativistic theoretical models a...