Next: Noise distributions Up: Basic Concepts Previous: Basic Concepts . The acquisition of a data frame involves a spatial sampling and digitalization of the continuous image formed in the focus plane of a telescope. ... The individual pixel values are obtained by convolving the continuous image with the pixel response function . With a sampling step of and the digital frame is given by . ... A frame is oversampled when while for smaller sample rates it is undersampled. ...

Below is a list of all of the modules that come as part of the Apache distribution. ... mod_setenvif Apache 1.3 and up . ... mod_unique_id Apache 1.3 and up . ... Determining document types using file extensions . ... mod_rewrite Apache 1.2 and up . ... User authentication using text files . ... User authentication using DBM files . ... User authentication using Berkeley DB files . mod_auth_anon Apache 1.1 and up . ... User-configurable logging replacement for mod_log_common . ...

... In brief: the frequency-dependent radiative transfer equation is solved for a dust under assumption of spherically-symmetric geometry for its distribution taking into account particle size distribution and quantum heating effects for the very small dust particles. ... Table: Model parameters for IRAS04296+3429. ... parameter . ... hot dust shell) . ... The best fit to the spectral energy distribution of IRAS04296 is shown by heavy solid line (see Table2 for details concerning parameters of the model...

... The absolute flux calibration of NICMOS will be calculated from observations of standard stars with known flux distributions F( ). ... In order to expand the set of IR standard stars in the appropriate flux range for NICMOS, M. Rieke, R. Thompson, and collaborators at the University of Arizona are making photometric observations of solar-analog stars, which will be used to normalize the solar spectrum to the observed IR magnitudes. ... Relative flux references accurate to 1.5% for standard...

... Science . ... Science Users Information > Data Handling and Products > Data Reduction FAQ > The response curve leaves residual instrument features in my science. ... Observing Facilities . ... Observing with ESO Telescopes . ... Science Data Products Forum . ... Science Archive Facility . ... ESO Data . ... ESO Data Access Policy . ... ESO Science Newsletter . ... To can be avoided by flat-fielding the flux standard star spectrum with the same flat field as is used for the science data. ...

Modules | ... Apache HTTP Server Version 2.2 . Apache > HTTP Server > Documentation > Version 2.2 . ... Other Modules . ... Core Apache HTTP Server features that are always available . ... This module provides for executing CGI scripts based on media type or request method. mod_alias . ... Sends files that contain their own HTTP headers . ... User authentication using MD5 Digest Authentication. mod_authn_alias . ... Provides for "trailing slash" redirects and serving directory index files . ...

... Canadian Astronomy Data Center, DAO/NRC . SkyCat is a tool that combines image visualization with access to astronomical catalogs and data archives. SkyCat uses a standardized URL syntax to access a large number of data sources on the net. ... More information on SkyCat can be found at the SkyCat Web site. The ESO SkyCat Tool includes the following features: . ... PostScript color printing of the display (image + graphics), . ... overlay catalog sources on an image, . ...

XMM ­Newton CCF Release Page: 1 XMM ­Newton CCF Release Note XMM ­ CCF ­REL­273 EPIC MOS response S. Sembay, R. D. Saxton, M. Guainazzi 24 March 2011 1 CCF components Name of CCF VALDATE EVALDATE Blocks changed XSCS flag EMOSn REDIST 0093. CCF 1999­12­10 2000­10­03 CCD REDISTRIBUTION ­n NO EMOSn REDIST 0094. CCF 2000­10­03 2001­04­22 CCD REDISTRIBUTION ­n NO EMOSn ... The residuals between 1.5 and 2.0 keV have been investigated and found to be improved in all fits. ...

... Posts tagged ?response matrix? ... A correct accounting of the spread of photons of course requires a full-fledged response matrix (RMF), but as it turns out, the line profiles can be fairly well approximated with Beta profiles, which are simply Lorentzians modified by taking them to the power ? ... Tags: beta profile , Chandra , EotW , Equation , Equation of the Week , Line Response Function , Lorentzian , LRF , point spread function , PSF , response matrix , RMF , XMM . ... Chandra Blog . ...

Programs to generate color spectra ================================== These programs were developed to produce realistic color spectra from digital data. ... The distribution here contains the original source code for colorspec and solar in C, and a version of solar written in Fortran. ... It will produce a color spectrum of any digital spectrum. ... The 800x50 image solarflux.ppm was generated by colorspec and the file fluxatlas.dat, a reformatted NSO Solar Flux Atlas in the data directory. ...

Following are instructions to build and install the programs in this distribution. Make sure that you have all necessary tools for building executables. ... The automatic build process expects a configuration file called Config.local . ... The configuration file specifies the directory in which to install the binaries, as well as control over the generation of debugging code and reference clock support. ... Cleans out object files, programs and temporary files. make distclean . ...

BOOM-TC2 - BOOM: Shadow of The Zedix (version 2) A Total Conversion for Ultimate Doom v1.9 featuring a complete episode (9 maps), new sounds and graphics, new monsters and new weapons. ... The original version contained an illegal hacked doom.exe; this version has an equivalent DeHackEd patch, so you can either patch your own legal copy of doom.exe, or just run it directly with an appropriate Source Port. ... If you haven't version 1.9 of DOOM already, get the update patch. ...

... Visible Distribution of Galaxies. ... Features of Elliptical, Lens-Shaped, Spiral and Irregular Galaxies. Galaxies with Bar. ... Distribution of Surface Brightness of Surface and Spiral Galaxies. ... Color Characteristics of Galaxies. ... Methods of Galaxies' Mass Determination. ... Hidden Mass of Spiral Galaxies. ... Features of Dark Matter Distribution in E and SO Galaxies. ... The Whole Number of Galaxies and Their Density by the Results of Observation on the 'Hubble' Space Telescope. ...

... Астронет | ... The second congress of the astronomical society of the former soviet union . ... Modelling the atmospheres of accretion disks . ... The distribution of old neutron stars in the galaxy . ... Compton scattering in a strong magnetic field: Resonances in the cross sections . ... Preface: "Physics of Neutron Stars" . ... Electric fields of neutron stars . ... Magnetic field decay in neutron star cores . ... The non-thermal mode of disc accretion onto the magnetosphere of a neutron star . ...

FEATURES OF THE HYDROGEN DISTRIBUTION AROUND LUNAR CRATERS PROCLUS AND KEPLER. ... In result of analysis of the data Lawrence and Feldman constructed the hydrogen distribution on the lunar surface [1]. ... However, the authors shown, that EN flux data features may be explained by other element abundance in the lunar soils, namely: Si, Ca, Gadolinium (Gd), Samarium (Sm) and Fe. ... Using of the Feldman's interpretation of the Lunar Prospector data [8], we constructed hydrogen distribution map (Fig.1). ...

Next: Structure of the Galaxy Up: Model of the Galaxy Previous: Model of the Galaxy . As discussed above (Section  6 ), galactic binary systems are assumed to be distributed logarithmically along their semi-major axis A (Abt and Levy, 1976[ 2 ]), . ... Figure 40: Number of binary stars per frequency decade. ... As the observed distribution of binary periods is flat (equation ( 15.3.1 )), the normalization constant is the total number of galactic binaries per frequency decade: . ...

... There are compelling reasons for the pulsar community to utilise a standard data storage format. For example, standardisation of file formats significantly decreases the amount of effort required to integrate new instruments into the analysis chain. ... Accordingly, we have defined PSRFITS as a standard FITS-based format for pulsar data files. ... For example, the first line of Processing History HDU contains information about the data acquisition program and the initial structure of the file. ...

Astronomical Data Analysis Software and Systems VII ASP Conference Series, Vol. ... Distributed Searching of Astronomical Databases with Pizazz K. Gamiel, R. McGrath and R. Plante National Center for Supercomputing Applications, University of Illinois, Urbana, IL 61801 Abstract. ... In such a model, one would build a distributed searching gateway that would o#er a single user interface, but would map the user's query to each and every original data source in its native protocol and interaction style. ...

OptInt PmWiki : Pm Wiki / Pm Wiki Philosophy . ... Design notes > . This page describes some of the ideas that guide the design and implementation of PmWiki. ... If you need to be writing lots of funky HTML in a web page, then PmWiki is not what you should be using to create it. What PmWiki does try to do is make it easy to link PmWiki to other "non-wiki" web documents, to embed PmWiki pages inside of complex web pages, and to allow other web documents to easily link to PmWiki. ...

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Star Atlas . ... Get to Know the Night Sky . ... Do astronomers know of or suspect any stars that were original members of the same star cluster as our Sun? ... The Sun is a star with a diameter of approximately 864,000 miles (1,390,000 kilometers), about 109 times the diameter of Earth. ... NASA/NSSDC Only one star, HIP 21158 in Taurus, remains a candidate sibling; however, the evidence that this star was born in the same cluster as the Sun is weak....