搜索结果: 1-15 共查到“天体物理学 frequency”相关记录16条 . 查询时间(0.156 秒)
A Systematic Study on Energy Dependence of Quasi-Periodic Oscillation Frequency in GRS 1915+105
accretion, accretion disks — black hole physics — stars: individual (GRS 1915+105) — stars: oscillations
2011/10/11
Systematically studying all the RXTE/PCA observations for GRS 1915+105 before November 2010, we have discovered three additional patterns in the relation between Quasi-Periodic Oscillation (QPO) frequ...
Time-Frequency Analysis of Superorbital Modulation of X-ray Binary SMC X-1 by Hilbert-Huang Transform
Time-Frequency Analysis Superorbital Modulation X-ray Binary SMC X-1 Hilbert-Huang Transform
2011/10/21
The high-mass X-ray binary (HMXB) SMC X-1 exhibits a superorbital modulation with a dramatically varying period ranging between ~40 d and ~60 d. This research studies the time-frequency properties of ...
Encoding many channels in the same frequency through radio vorticity: first experimental test
channel frequency first experimental test
2011/8/4
Abstract: We have shown experimentally that it is possible to propagate and use the properties of twisted non-monochromatic incoherent radio waves to simultaneously transmit to infinity more radio cha...
Studying Frequency Relations of kHz QPOs for 4U 1636-53 and Sco X-1: Observations Confront Theories
Studying Frequency Relations kHz QPOs 4U 1636-53
2011/1/13
By fitting the frequencies of simultaneous lower and upper kilohertz Quasi-Periodic Oscillations (kHz QPOs) in two prototype neutron star QPO sources (4U~1636-536 and Sco X-1), we test the predictive...
A low frequency study of PSRs B1133+16, B1112+50, and B0031-07
low frequency study PSRs B1133+16
2011/1/13
The low frequency (110--180 MHz) capabilities of the Westerbork Synthesis Radio Telescope (WSRT) are used to characterise a large collection of single pulses from three low magnetic field pulsars. Usi...
Variation in the frequency separations with activity and impact on stellar parameter determination
Variation frequency separations activity impact
2010/11/15
Frequency separations used to infer global properties of stars through asteroseismology can change depending on the strength and at what epoch of the stellar cycle the p-mode frequencies are measured....
Multi-frequency emission analysis and constraining redshift of 3C 66A
BL Lacertae objects individual galaxies active gamma rays general
2010/11/11
The emission mechanism of TeV blazar 3C 66A is studied by employing the multi-wavelength
observational data. The GeV spectrum observed by Fermi-LAT can’t be explained by pure synchrotron self-Compton...
Radio Halos and the importance of future observations at low frequency
Radio Halos future observations low frequency
2010/11/11
Radio observations discovered large scale non thermal sources in the central Mpc regions of
dynamically disturbed galaxy clusters (radio halos). The morphological and spectral properties of these sou...
Ross Ice Shelf in situ radio-frequency ice attenuation
Ross Ice Shelf situ radio-frequency ice attenuation
2010/11/10
We have measured the in situ average electric field attenuation length hL i for radio frequency signals broadcast vertically through the Ross Ice Shelf. We chose a location,Moore Embayment, south of M...
Radio Frequency Interference Mitigation at the WSRT
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2011/1/4
The sensitivity of radio astronomical stations is often limited by man-made radio frequency interference (RFI) due to a variety of terrestrial activities. An RFI mitigation subsystem (RFIMS) based on ...
Constraints of a pulsation frequency on stellar parameters in the eclipsing spectroscopic binary system: V577 Oph
binaries: eclipsing — binaries spectroscopic — stars fundamental parameters — stars
2010/11/15
We present a preliminary spectroscopic analysis of the binary system V577Oph, observed during the summer of 2007 on the 2.6m NOT telescope on La Palma. We have obtained time series spectroscopic obser...
ITERATION FACTORS IN THE LINE FORMATION PROBLEM WITH FREQUENCY DEPENDENT SOURCE FUNCTION
Radiative transfer Line: formation methods: numerical
2010/10/29
In this paper some iteration factors families introduced previously to solve the pure line transfer problem are generalized to the case when the background continuum is taken into account.The converge...
FREQUENCY MODULATION OF THE CHANDLER WOBBLE。
PRESSURE AT THE ISM-HALO INTERFACE：A REHEATING FREQUENCY DEPENDECE
ISM-HALO INTERFACE REHEATING FREQUENCY DEPENDECE
2009/3/26
The dependence of the thermal pressure of hot galactic halos on a
model parameter describing the frequency of major reheating episodes during galactic
history is investigated. Pressure on the interf...
A MULTI-FREQUENCY STUDY OF THE DEEP PAVO FIELD
cosmology diffuse radiation-galaxies active-galaxies Seyfert-radio continuum galaxies-X-rays galaxies
2009/3/12
We test the prediction of Hamilton and Helfand (1993) that faint
radio selected galaxies are a new class contributing to the diffuse X-ray background
(XRB) radiation. The test is based on the correl...