... We now consider estimation of count rates for objects with stellar, power law, and emission line spectra. To estimate the number of electrons collected from a point source of apparent visual magnitude V, one can use the equation: . ... If one knows the spectral index a (which is zero for a source with a flat continuum), V + AB nu can also be calculated as the monochromatic Oke system magnitude at the corrected mean wavelength of the filter: . ... 6.3.3 - Count Rates for Emission Line Sources . ...

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• Plots for Estimating Point Source SNR
• Appendix B: Point Source SNR Plots

... arfgen (arfgen-1.75.6) [?? Meta Index / Home Page / Usage and Examples Here is a typical example of running arfgen based on a spectrum of a point source: . arfgen spectrumset=spectrum.ds detmaptype=psf . ... The effective area, filter transmission and quantum efficiency curve are included in the ARF. ... Corrections are applied for any CCD gaps or source region area falling outside the field-of-view or observing window but not for bad pixels or bad columns. ...

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• EPIC source finding thread: step by step
• Example 4: Specifying an external detector map for an extended source

... Duchamp | ... Top | Duchamp is a solution to this problem of three-dimensional source finding. ... A list of the detections and their properties, as well as the input parameters that were used. [text file] . ... It can be downloaded in source format, in a gzipped tar archive. ... Changes from the previous version can be seen here (this file is included in the tar archive), while the archive files and documentation from the previous release versions are here , if you are really interested. ...

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• Selection and Multi-Source/Multi-Frequency Datasets
• casacore: images/Images/ImageSourceFinder.h Source File
• Source Fitting and Positions

... 173Wall Peacock We catalogue the brightest extragalactic radio sources at 2.7 GHz. ... These data were originally presented in Wall and Peacock, MNRAS, 216, 173. The values in parenthesis include (units, datatype, example). 1 iauname Name of source in IAU convention (char7, example: '0320-37') . ... 3 ra_1950 rad Right ascension of source in radians (B1950) (real, example: 0.876068) . ... 9 alpha Spectral index of source between 2.7 and 5 GHz (real, example: 0.52) . ... Longair, 1975 . ...

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• The ROSAT All-Sky Survey Faint Source Catalogue
• HyperLEDA documentation: Spectrophotometric resources
• Optical spectroscopy of radio sources

. Next: Charged Particle Subtraction Up: *qpspec* - Extraction of Previous: Spectral Extraction of Point . When analyzing extended sources the background must be obtained from a region well separated from the source. To correct the background for the differential vignetting (i.e., the difference between source and background vignetting) of the ROSAT mirror, set the vign_corr flag in qpspec to yes. For example: . xs > qpspec vign_corr=yes . rsdc@cfa.harvard.edu . 1998-06-10

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• Source Selection
• *imcnts* - Radial Profile of an extended source at the field center
• An example of a typical timing analysis

... Next: The PROS Big Up: Software Systems Previous: Data Reduction Software . ... The srcinten task provides PROS users with a tool to compute count rates for point sources in the ROSAT High Resolution Imager (HRI). ... Corrected upper limits are cited at locations where the count rate falls below the source detection threshold. ... Srcinten is a new PROS task that computes and applies the above correction factors to the net counts in a user-specified aperture. ...

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• An Extragalactic Point Source Simulator for SIRTF Pipeline Testing
• AstroWeb -- Internet Resources for Astronomers
• QPSIM: An IRAF/PROS Tool for Source Simulation

... Appendix B. FTS Parser Example . ... This is a test_ parser .c #ifdef PG_MODULE_MAGIC PG_MODULE_MAGIC; #endif /* * types */ /* self-defined type */ typedef struct { char * buffer; /* text to parse */ int len; /* length of the text in buffer */ int pos ; /* position of the parser */ } ParserState ; /* copy-paste from wparser.h of tsearch2 */ typedef struct { int lexid; char *alias; char * descr ; } LexDescr; /* * prototypes */ PG_FUNCTION_INFO_V1(testprs_start); Datum testprs_start( ...

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• ntptrace - trace a chain of NTP servers back to the primary source
• Open Source Convention

The Astronomy Net . Articles | AstroGuide | ... Forums . ... H ere you can find resouces to help understand perhaps the grandest of all sciences. ... Upcoming Sky Events . ... This site includes lists of manufacturers, vendors, software, etc. organized in the AstroGuide to help when you are looking to purchase your tools. ... Astronomy Articles . ... Are you interested in writing an article for the Astronomy Net? ... www.astronomy.net . ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Re: Re: Thanks For Making And And Of An Excellent Open Source Progra - an
• Re: Thanks For Making And And Of An Excellent Open Source Progra - an Astronomy
• Maybe This Is The Source... - an Astronomy Net UFO Forum Message

... LABORATORY OF RADIO ASTRONOMICAL OBSERVATIONS . Radio sources identification is one of the most important tasks of the current radio astrophysics. ... Optical idetification. ... Optical identifications of subsample of steep spectra radio sources from RC catalog using 6m SAO telescope of SAO RAS: optical observations. ... Astronomy Reports. ... Identification of radio sources with data of various radio catalogs allows one to construct continual spectrum of the object and its radio structure. ...

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• Plug-and-Play-HOWTO : Tell the Driver the Configuration
• Search for distant radio galaxies in SAO
• More IPC Resources

Next: The Model Up: No Title Previous: Radiopulsars as Sources of . In this section, we study the evolution of stellar populations on a time-scale of 10 Myr for a starburst љ occurring under conditions similar to those in the Galactic Center (see Lipunov et al. (1995d)[ 126 ]). We estimate the expected number of X-ray transient љ sources (NS + MS star), super accreting BH, and BH + supergiant binaries, all as functions of time elapsed after the burst. ...

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• Effect of sources evolution on
• X-ray Galactic Sources and Binary Radiopulsars as Probes of the Initial Mass
• Astronomical Resources

... During the analysis of the surveys carried out on RATAN-600, it was found that almost one fifth of the detected sources shows significant radio flux variations. ... We used the data from "Cold" radio surveys carried out with RATAN-600 in 1980-1994 to search for radio sources with significant flux variability. ... On possibility of detection of variable sources using the data of Cold surveys carried out on RATAN-600. ... Detection of Variable Sources Using the Data of "Cold" Surveys. ...