0000000000297460

AUTHOR

Dmitrijs Docenko

showing 3 related works from this author

Possibility of measuring the amount of intergalactic metals with 14N VII HFS line

2009

AbstractWe discuss possibility of observations of the warm-hot intergalactic medium using the hyperfine structure line of highly charged nitrogen ion 14N VII (rest wavelength λ = 5.652 mm). Observations of this line will allow to separate bulk and turbulent motions in the observed target and will broaden the information about the gas ionization state, chemical and isotopic composition.Wavelength of this line is well-suited for ground-based observation of objects at z ≈ 0.15 − 0.6 when it is redshifted to the widely-used 6.5 − 9 mm spectral band, and, for example, for z ≥ 1.3, when the line can be observed in 1.3 cm band and at lower frequencies.

PhysicsWavelengthSpace and Planetary ScienceIonizationIntergalactic travelAstronomy and AstrophysicsAtomic physicsLyman-alpha forestIntergalactic dustHyperfine structureLine (formation)IonProceedings of the International Astronomical Union
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Spline Histogram Method for Reconstruction of Probability Density Functions of Clusters of Galaxies

2003

We describe the spline histogram algorithm which is useful for visualization of the probability density function setting up a statistical hypothesis for a test. The spline histogram is constructed from discrete data measurements using tensioned cubic spline interpolation of the cumulative distribution function which is then differentiated and smoothed using the Savitzky-Golay filter. The optimal width of the filter is determined by minimization of the Integrated Square Error function. The current distribution of the TCSplin algorithm written in f77 with IDL and Gnuplot visualization scripts is available from this http URL

PhysicsCumulative distribution functionMathematicsofComputing_NUMERICALANALYSISProbability density functionAstrophysicsVisualizationSpline (mathematics)Computer Science::GraphicsHistogramMinificationSpline interpolationAlgorithmComputingMethodologies_COMPUTERGRAPHICSStatistical hypothesis testing
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Spline histogram method for reconstruction of probability density function of clusters of galaxies

2003

We describe the spline histogram algorithm which is useful for visualization of the probability density function setting up a statistical hypothesis for a test. The spline histogram is constructed from discrete data measurements using tensioned cubic spline interpolation of the cumulative distribution function which is then differentiated and smoothed using the Savitzky-Golay filter. The optimal width of the filter is determined by minimization of the Integrated Square Error function. The current distribution of the TCSplin algorithm written in f77 with IDL and Gnuplot visualization scripts is available from http://www.virac.lv/en/soft.html

Computer Science::GraphicsAstrophysics (astro-ph)MathematicsofComputing_NUMERICALANALYSISFOS: Physical sciencesAstrophysicsComputingMethodologies_COMPUTERGRAPHICS
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