We are going to take the Abell clusters that are within 20 degrees of the South pole, then select those
with Bautz-Morgan type "II", then crossmatch these against the EUVE and ROSAT catalogs.
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| Start at the NVO Registry, and
search for the Abell catalog (top red oval). When the results come, click "Search Me" on the entry
for the Abell catalog. |
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| This is the "SimpleQuery" interface. You see the IVORN
identifier of the Abell catalog services (starting ivo://). Put in the coordinates of the south pole and a radius of 20 degrees, and click Submit.
The NVO SimpleQuery service will now find the subset of the Abell catalog near South pole.
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| When the results come through, choose the "Export" pulldown, and select VIM Service.
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The sources from the SimpleQuery are automatically transferred to a new VIM workbench.
You should see a table with 153 rows and columns for RA, Dec, and VIM_SOURCE_ID, which is actually
just the number from Abell's catalog. All the original source data is also there -- use Table Columns / Sources to select other columns to display, then the button at the top labeled "Click Here When Finished Choosing"
We could at this point utilize the dozen or so catalogs that VIM already knows about (do Fetch Data / VO Proximity Search, and check the "Catalog" pulldown). This is the so-called "Catalog cache". You can see more about the catalog cache at Catalogs / View Catalog Cache.
However, let us get a specific catalog from the VO, then use it for proximity searches. Let us look for UV sources
by searching the EUVE catalogs. Click through the menu Catalogs / Find Catalog Services.
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You have been transferred to the NVO Registry. (Don't worry, your Vim session is still alive). Put "EUVE"
in the search box (top), then check the catalogs you want to match against, then at the right, choose
"Next send results to", and select "VIM" from the pulldown. You will be transferred back to your Vim workbench.
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| Now check that the EUVE catalogs are in the cache. Do Catalogs / View Catalog Cache to
see. You will see the two new catalogs from EUVE first, then the dozen primary catalogs already there. |
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| We can do a proximity search with the new catalogs, select Fetch Data /VO Proximity Search
and choose the radius. You can also choose the number of columns returned (verbosity). Running multithreaded
is faster, but some servers cannot do it, and if so scale back to single-threaded. |
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| Let us select from the list we have. First choose Table columns / sources and make sure "bmtype"
is selected before refreshing with the button at the top. |
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| Choose Mine Data / Select Rows to bring up the tools control form. Let us choose those
galaxy clusters whose BM type is "II", with the expression bmitype = \"II\". The number of rows is reduced
from 153 to 42.
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| In this last screenshot, we see the table, proximity matched with both EUVE and also ROSAT.
The table has been sorted, you can just click on the gray column header. You can also click-drag-release
the column headers to change the order of the columns. |
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