Next: Methods for Structuring and Searching Very Large Catalogs . ... We have explored two automated classification methods: supervised classification using Artificial Neural Networks (ANN) and unsupervised classification using Self Organized Maps (SOM). These methods are used to classify IUE low-dispersion spectra of normal stars with spectral types ranging from O3 to G5. This paper describes the application of automated methods to the problem of the classification of stellar spectra. ...

... Meta Index / Home Page / Some functions for testing/debugging . This function returns .true. if the given pair of values agree with each other in the given precision (order), or .false. otherwise. LOGICAL(bool) FUNCTION isNearlyEqual(cmp, compared, precision) REAL, intent(in) :: cmp, compared ! or INTEGER INTEGER, intent(in) :: precision END FUNCTION isNearlyEqual . For the pair of the first two arguments, any combination of int8 , int16 , int32 , single and double is allowed. ...

... Automated Spectral Classification Using Neural Networks E. F. Vieira Laboratorio de AstrofТРsica Espacial y FТРsica Fundamental P.O.Box 50727, 28080 Madrid, Spain, Email: efv@lae#.esa.es J. D. Ponz GSED/ESA, Villafranca P.O.Box 50727, 28080 Madrid, Spain, Email: jdp@vilspa.esa.es Abstract. We have explored two automated classification methods: supervised classification using Artificial Neural Networks (ANN) and unн supervised classification using Self Organized Maps (SOM). ...

... Delivery Procedures . ... File Structure . Reference Files . ... The procedure compares two FITS reference files tables. ... The compared elements are limited to those specified in the COLUMNS parameter (which is necessary for this program to run). ... The parameter COLUMNS is an n-element array of strings with the names of the columns to compare within the table. ... When a combination is missing (in the new_file ;or in the old_file) the procedure will flag it in the standard output. ...

... User Guide ] Task: imcmp Purpose: Compare two images Categories: map analysis IMCMP is a MIRIAD task to compare two images. ... The two images are compared on a pixel by pixel basis, within a user defined region. Key: in1 The first input image. No default Key: in2 The second input image. No default Key: region Region to select data to compare. ... Key: cut Cutoff applied to data. ... Key: limy Minimum and maximum for plotting the pixel values of image 2 Default: autoscaling. ...

... Archives . ... Grating Dispersion [Equation of the Week] . Jun 8th, 2008| 09:45 pm | ... Despite no statistic related discussion, a paper comparing XSPEC and ISIS, spectral analysis open source applications might bring high energy astrophysicists? interests this week. [astro-ph:0806.0650] Kimball and Ivezi\?c . ... A Statistical Analysis of the ?Internal Linear Combination? ... Category: arXiv , Data Processing , gamma-ray , High-Energy , Methods , Stat | ... Chandra Blog . ...

... Bojan Nikolic web pages (r. 329) . ... Analysis of (radio) spectra . The RNested package is a re-implementation of the main algorithms from the radiospec package into the R statistical data analysis environment. ... packages ( "RNested" , repos = c ( "http://www.mrao.cam.ac.uk/~bn204/soft/R" , "http://cran.us.r-project.org" )) . ... RNested ? Nested Sampling in R & analysis of spectra . ... Copyright 2005 -- 2016, Bojan Nikolic feedback welcome ...

... Take a particularly simple signal: a cosine wave. ... Now, we are going to stretch and shrink the wavelet along the time axis (we assume the data is in the time domain), and at each time compare the shape of the signal to that of the wavelet. ... Figure 3: The wavelet (dotted line) is translated rela tive to the signal (solid line). ... Figure 4: The dashed line plots the `match' between the wavelets (dotted line) and the signal (solid line) as a function of time. ...

Next: Principal Components Analysis Up: Multivariate Analysis Methods Previous: Multivariate Analysis Methods . Compared to the past, ever larger amounts of data are being collected in astronomy, and the rate will continue to accelerate in the next decades. It is therefore necessary to work on bigger samples if full advantage is to be taken of all accessible information. ... One way to work effectively on large samples is to apply, and if necessary to develop, suitable statistical methods. ...

. You can compare any two versions of a file that is under the control of SCCS with the sccsdiff command: /usr/sccs/sccsdiff -r version -r version s. filename . Using this command produces a line by line difference between the two versions of the file. Results are shown in the same format as that produced by the diff command. Examples .

Jeff mock supplied 6 different types of filters to use with the high resolution mode of the mock spectrometer. ... Plots were made of the time domain voltage response as well as the frequency domain power response. A decimation of 10 was used for the filter decimation. this gave a filter length of 80 coeff. The plots compare the filter shapes for these filter types (.ps) ( .pdf ) . ... Each color is a different filter type . middle: spectral density reponse for each filter . ...

... The sample of the Local Volume galaxies (distance smaller than 10 Mpc) gives a unique opportunity to study the properties of galaxies including the weakest objects: the absolute magnitude M B -10 and the virial mass M vir 10 9 M x263C;. ... Luminosity function of the Local Volume galaxies. ... The luminosity functions for galaxies are presented: red dashed line - from the 2dFGRS survey (Norberg et al. 2002); blue dash-dotted line - from the SDSS survey (Blanton et al. ...

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... Mass . 17a. Measuring Mass . ... A medium-size (1.25 inch wide) binder clip, as is used in offices to hold papers together--the type made of flat blue steel, with two wire handles. ... The theory predicts that the oscillation period should be proportional to the square root of the oscillating mass, including the mass of the clip. Note that gravity plays no part here: the oscillation period would be the same on the Moon or in zero-g. Denoting square root by SQRT, we have . ...

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . Directory of astronomy web sites. ... Listed Since October 25, 2004 . ... Web Site . http://123world.com/astronomy/index.html . ... Web . www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

... We describe here all plotting and editing procedures. For calibrated visibility data, as well as other data from e.g. astrometry, the user will select plotting menus from the so-called AMOEBA (lower) section of the main GUI. While AMOEBA is described later on in a dedicated part of this manual, it is the general data analysis (as compared to reduction ) facility of . ... INTERFEROMETRY Plot visibility data . ... Each of the above buttons will display a widget designed for this class of plot. ...

... In this work, we investigate some a new possibility to estimate correlations between radio source position catalogs (RSC). ... Catalogs AUS AUS AUS AUS AUS AUS BKG BKG BKG BKG BKG GSF GSF GSF BKG GSF IAA MAO OPA USN GSF IAA MAO OPA USN IAA MAO OPA USN MAO OPA USN OPA USN GSF IAA IAA IAA MAO With correlations, the system to be solve consists of the equations: The key point is to obtain a reliable estimates of ij. ...

... Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... What are typical star-to-star distances in globular clusters compared to stellar distances in our region of the galaxy? ... RELATED TOPICS: GLOBULAR CLUSTERS . ... Get instant access to subscriber content on Astronomy.com! ...

... The 7 and 15 um observations of selected fields in the Galactic Plane obtained with ISOCAM during the ISOGAL program offer an unique possibility to search for previously unknown YSOs, undetected by IRAS because of lower sensitivity or confusion problems. ... The main indications of the previous analysis are confirmed, but the criteria for selecting YSO candidates had to be revised to select only bright objects, in order to limit the contamination of the sample by Post-MS stars. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... In the late 1970s, jets were discovered in megaparsec-long radio galaxies. ... This involved the first quantitative analysis of jet warping, bending and disruption in galactic halos. ... Hot spots are created where a jet finally crashes into the surrounding medium. ... I extended the so-called Twin Exhaust Model, using numerical simulations to show that hot gas can be ejected in three forms: jets, bubbles and clouds. ...