True Color Image Gallery: Galactic SNR | ... Position of Central Source (J2000) : ( 05 40 11.1, -69 19 55.2 ) . ... Radio Images Page . ... Exposure uf . ... Trailed Image of the central source is significant. ... 0.3 - 10.0 . ... central source . ... nH was derived by fitting the trail of central source which is believed not to be piled-up. see fit detail page for more about the fit. see chandra spectrum page for region used. ... 2001 , ApJ, 560, 742 : Chandra ACIS imaging and spectroscopy . ...

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• Chandra Images for G016.7+00.1
• Chandra Images for G014.7+09.1
• Chandra Images for G016.0+00.0

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: . ... The second column contains B-V. See Target Count Rates . ... If one knows the spectral index (which is zero for a source with a flat continuum), V + AB can also be calculated as the monochromatic Oke system magnitude at the corrected mean wavelength of the filter: . ...

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

... When the source-detection algorithms has run omdetect will compute raw count-rates for each detected source. For point-sources (ie those sources having widths consistent with those of the point-spread function) the count-rates are obtained by aperture photometry. For binned and unbinned images the aperture is 6 and 12 pixels, respectively. ... Extrapolate (if necessary) the source count-rate to the 12 unbinned pixel aperture, using the point-spread function for the filter. ...

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• General source table layout
• Parameters
• FILTER_CORR_RATE

Next: Catalog Construction Up: Observations and Analysis Previous: Source Detections . ... It was assumed that the highest signal gives the most likely position of the source. ... Comparing the summed map with the maps from the individual energy ranges, the one which produced the smallest error box was chosen to represent the source position, as long as was greater than 4, a level chosen to reflect a reasonable degree of confidence in the detection. ...

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• Primary Catalog
• The Parkes 6 cm Galactic Survey
• The Second EGRET Catalog of High-Energy Gamma-Ray Sources

These pages collect together references to many pictures of the solar system that can be found on the Net. ... Since I originally compiled this list the number of relevant images has grown tremendously. ... http://www.jpl.nasa.gov/pictures/ . ... ftp://dftnic.gsfc.nasa.gov/images/gifs/ . ... http://www.jpl.nasa.gov/galileo/images.html . http://www.jpl.nasa.gov/magellan/images.html . ... http://nssdc.gsfc.nasa.gov/image/planetary/ . ... NASA Image Access Homepage (Planetary Photojournal) . ...

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• Venus Picture List
• Earth Picture List
• The Sun

... In one situation, we can use light from quasars to probe the material between us and them because that light may pass through one or more galaxies or gas clouds on its way to us. The gas inside the galaxies or the intergalactic clouds acts then as a filter, absorbing selected wavelengths from the quasar light. ... Light from a quasar must pass through clouds of gas and even faint galaxies -- each leaving its imprint on the light -- before we receive it here on Earth. ... Gravitational lensing . ...

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• ASP: The Astronomy of Many Cultures: A Resource Guide
• ASP: Good Astronomy Activities on the WWW
• ASP: Black Holes: An Introductory Resource List

... 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
• Access to Data Sources and the ESO SkyCat Tool
• Recreating Einstein Level One Processing Exposure Masks and Background Maps in

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Online Resources . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... H Emission From Point Sources In The Magellanic Clouds . ... Large numbers of the many types of emission-line object that are found in the Magellanic Clouds were first identified through H surveys of one kind or another...

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• casacore: casa/Logging/LogSinkInterface.h Source File
• casacore: tables/LogTables/LogFilterTaql.h Source File
• casacore: casa/Logging/LogFilter.h Source File

Venus in visible light (violet filter) 17k jpg . Venus in visible light 73k gif . image from Pioneer Venus 15k jpg ; 28k jpg ( caption ) . ... UV image from HST WFPC2 (false color) 23k jpg ; 99k gif . ... New Magellan mosaics (5 hemispheres) 13500k tiff ; ( caption ) . ... 7 pancake volcanoes, alpha region 227k gif ; . Lada Regio, 47 deg S, 25 Long, showing mountains and craters 121k gif ; . ... False color IR image of Venus' lower clouds as seen by Galileo 37k jpg 112k gif ( caption ) . ...

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• Earth Picture List
• Hands On; Lighting Effects1
• Jupiter Picture List

... 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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• PUBLICATIONS IN 1998
• Spectra of RC-catalog sources

The A/D rms values versus mixer gain were measured on the sky with alfa to see how much range we had around the optimal operating level (an A/D rms of 30 counts). ... Gain vs attenuation in the mixer chassis: . ... gain variable=0 : bbmchassis gain: 14db - 31 db Attn = -17db of gain . ... The plots show the A/D rms counts vs bbm gain . ... 7.5 -12.5 U5 Attn . ... The measured output level from the mixer chassis (beam5a low band) was -4dbm so there is 4db more gain in the mixer chassis than expected. ...

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• Technical Data for the Arecibo Airglow and Optical Instrumentation
• Index of /~phil/hardware/vertex/sharemegsvertex/lcu/pcr/c600/source/PWB