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MultiwavelengthSchool09
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InteractiveSession
(07 Jul 2009,
MarkAllen
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*Use Case: Searching for Data available for the bright galaxy M51. (Aladin, SIMBAD, VizieR, Topcat, VOSpec)* * Search for images of the bright galaxy M51 in Aladin. * Try the various image servers: The Aladin image server, Skyview and Sloan Digitial Sky Survey * Try the 'all VO' access (selecting image servers) - Note the method for selecting images at a given sky location. Clicking in the image puts a tick in the selection boxes of the available data. * Make a colour composite image using the RGB tool. * Use the multi-view windows to manage the various images you have in the 'stack' * Try the 'match' button at the bottom of the image window to align the image for synchronized zooming * Try the transparency control for viewing images overlaid on each other * Overlay as SIMBAD identifications using the SIMBAD link in the Server selector window * Check <span style="color: blue; text-decoration: underline">VizieR</span> via Aladin for more detailed catalogues of HII emitting regions in M51. (e.g. <span style="font-family: Times; font-size: medium; -webkit-border-horizontal-spacing: 1px; -webkit-border-vertical-spacing: 1px; -webkit-text-decorations-in-effect: underline" class="Apple-style-span">Positions and photometry of HII knots in M51 (Calzetti+, 2005))</span> * Start Topcat and send tables from Aladin to Topcat (right-click on the plane in the stack, and 'Broadcast selected tables to ...') * Note interoperability between Topcat and Aladin, e.g. selecting points in both tools (via position in Aladin, and via any plot window in Topcat) * Make a subset of the brightest HII regions, and send the table back to Aladin using the Topcat 'Interop' menu * Search for spectra available in the VO with the 'all VO' button in the server selector window. * Find spectra available from the ST-ECF Hubble Space Telescope Spectra service, and view the positions of the spectra (and sometimes the spectral slit aperture) on the image. Make a plane containing all the spectra positions, and cross match these with the positions of the HII regions. * Start VOSpec ( Web Start: <a href="http://esavo.esac.esa.int/webstart/VOSpec.jnlp" title="http://esavo.esac.esa.int/webstart/VOSpec.jnlp">http://esavo.esac.esa.int/webstart/VOSpec.jnlp</a> ) and display some of the spectra, by clicking on the spectra in the server selector window, and 'Load in -> VOSpec'. -- Main.MarkAllen - 07 July 2009
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Topic revision: r3 - 07 Jul 2009
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MarkAllen
EuroVOAIDA/VOSchool09
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