搜索结果: 1-15 共查到“天文学 component”相关记录28条 . 查询时间(0.122 秒)
Spitzer spectral line mapping of supernova remnants. I. Basic data and principal component analysis
Molecules Abundances
2014/12/23
We report the results of spectroscopic mapping observations carried out toward small (1' × 1') regions within the supernova remnants W44, W28, IC 443, and 3C 391 using the Infrared Spectrograph (IRS) ...
A two-component jet model based on the Blandford-Znajek and Blandford-Payne processes
two-component jet model Blandford-Znajek Blandford-Payne processes
2012/2/23
We propose a two-component jet model consistent with the observations of several gamma ray bursts (GRBs) and active galactic nuclei (AGNs). The jet consists of inner and outer components, and they are...
A double component in GRB 090618: a proto-black hole and a genuinely long GRB
double component GRB 090618 proto-black hole GRB
2012/2/23
The joint X and gamma-ray observations of GRB 090618 by a large number of satellites offer an unprecedented possibility of testing crucial aspects of theoretical models. In particular, it allows us to...
Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande
ultra-high energy cosmic rays KASCADE-Grande composition extensive air shower
2011/10/20
We report the observation of a steepening in the cosmic ray energy spectrum of heavy primary particles at about $8 \times 10^{16}$ eV. This structure is also seen in the all-particle energy spectrum, ...
Orbital effects of the time-dependent component of the Pioneer anomaly
Orbital effects time-dependent component Pioneer anomaly
2011/10/17
We work out the impact that the recently determined time-dependent component of the Pioneer Anomaly (PA), interpreted as an additional exotic acceleration of gravitational origin with respect to the w...
Electron-acoustic solitary waves in the presence of a suprathermal electron component
Electron-acoustic solitary presence suprathermal electron component
2011/10/20
The nonlinear dynamics of electron-acoustic localized structures in a collisionless and unmagnetized plasma consisting of "cool" inertial electrons, "hot" electrons having a kappa distribution, and st...
The Two-Component Radio Luminosity Function of QSOs: Star Formation and AGN
The Two-Component Luminosity Function Star Formation AGN
2011/10/11
Despite decades of study, it remains unclear whether there are distinct radio-loud and radio-quiet populations of quasi-stellar objects (QSOs). Early studies were limited by inhomogeneous QSO samples,...
Spectra disentangling applied to the Hyades binary Theta^2 Tau AB: new orbit, orbital parallax and component properties
the Hyades binary Theta^2 Tau AB orbital parallax component properties
2011/1/11
Theta^2 Tauri is a detached and single-lined interferometric-spectroscopic binary as well as the most massive binary system of the Hyades cluster. The system revolves in an eccentric orbit with a peri...
Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B
Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B
2011/1/10
Observations of GRB 100724B with the Fermi Gamma-Ray Burst Monitor (GBM) find that the spectrum is dominated by the typical Band functional form, which is usually taken to represent a non-thermal emis...
Absence of a Periodic Component in Quasar z-Distribution
arge-scale structure of Universe quasars general catalogues,methods data analysis
2010/11/10
Since the discovery of quasars in papers often appeared and appear the assertions that the redshift quasar distribution includes a periodic component with the period z = 0.063 or 0.11. A statement of...
Non-adiabatic perturbations in multi-component perfect fluids
Non-adiabatic perturbations multi-component perfect fluids
2010/11/16
Еvolution of non-adiabatic perturbations in models with multiple coupled perfect fluids with
non-adiabatic sound speed is considered. Instead of splitting the entropy perturbation on relative and int...
Reionization constraints using Principal Component Analysis
dark ages reionization first stars intergalactic medium cosmology
2010/11/12
Using a semi-analytical model developed by Choudhury & Ferrara (2005) we study the observational
constraints on reionization via a principal component analysis (PCA). Assuming
that reionization at z...
A cold component and the complex velocity structure of DLA1331+170
Asthma oxidative stress total oxidant status total antioxidant status eosinophil cationic protein
2011/1/4
We examine the velocity structure in the gas associated with \ion{H}{1} in the damped Ly$\alpha$ absorption system at redshift $z=1.7764$ towards the QSO $1331+170$ using 21cm data, optical and STIS s...
The missing gas problem in GRB host galaxies: evidence for a highly ionised component
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/28
There is considerable discrepancy between the amount of X-ray absorption and that inferred from optical (rest frame UV) as measured along gamma-ray burst (GRB) sight lines, with the former being typic...
Domain Wall, Stiff Matter and Ultra-Relativistic Particles from a Generalized Double-Component Dark Energy Model
Super-accelerated expansion dark energy domain wall cosmic string stiff matter
2010/6/30
This letter discusses a modified Friedmann-Robertson-Walker cosmology in which the equation of state behaves like p = 3hamrn r; (h;m;n) 2 R. Many interesting features are revealed in particu...