The NOAO-analysis page is a proto-type tool to help users analyze data which is available through VO-compliant and publicly available archives using VO tools and services. At this point in time, please use only W3C compliant browsers (Mozilla, Firefox, Netscape). It is not yet functional in Internet Explorer or Safari.

After the use has chosen to add items from a previous search (i.e., after listing images in a region of the sky or on a certain data, choose to "Add" an image resource), you can view your cart by clicking on the Analysis link in the top left corner of any of the Portal webpages.
A list of images with their metadata should appear (or it will say "Your Cart is Empty" if nothing is in it).

The first row explains each column. Hold your mouse over the first three columns in the first row to find out more information about each tool. Also, you can click on those columns to be taken to the tool homepage (outside of the NOAO).

The NOAO-analysis page is interactive. You can click on any of the available tools (currently Aladin, WESIX, and WCSFIX) to have an image sent directly to that service for analysis. In the following text, we describe how a user might use those services.

Clicking the Aladin link in the row of any image will start an Aladin Java applet in your browser. If you do not have the plug-in...you will need to get one for your browser. Likewise, you will need to accept the certificate of authentication provided by Aladin.

Aladin is a multi-use image and catalog viewer. It allows users to upload images and catalogs for viewing and overlays. Additionally, Aladin allows users to access images and catalogs from online astronomical archives.

After you click the Aladin link, wait a few moments for the viewer to start.

If nothing happens, you may need to restart your browser.

If all else fails, please visit the Aladin website for further details on the technical requirements for running Aladin in your browser.

After a few moments, you should see your browser refresh and see the Aladin viewer start.

In the lower right hand corner (see the yellow translucent elipse in the figure), you should see your data being uploaded for viewing.

After your data has been uploaded, you should see the image appear in the Aladin viewer.

Clicking on the WESIX link will take you to the Web-enabled Source Extraction and Cross Match tool.

WESIX utilizes SEXtractor to find stars and galaxies in your image. It then attempts to cross-match those sources with some user specified catalog data from the VO.

After clicking the WESIX link, you should see the WESIX homepage.
The image you chose to run WESIX on should appear in the URL form-box (see the top tanslucent yellow circle in the figure).
The user must choose a catalog to cross-match against. At this point in time, the user must know which catalogs exist in the region of the observed image. In this example, we have chose to match against the SDSS DR2. (see the second translucent yellow circle).
The user has the option to specify some parameters in the SEXtraction (see the third lowest translucent yellow circle). If this check box is not specified, the SEXtractor defaults are utilized.
Finally, click submit (and wait a few moments)

After a few moments (depending on the size of your image), your data should be uploaded to the WESIX server.

You will then see this pager (left).

The top list is a choice of parameters that SEXtractor reports. The user should choose any/all of these for their particular science. For instance, the use might want to get the fluxes and magnitudes of the detected objects.

The bottom list (lower translucent yellow circle) is a list of parameters of pre-measured data from the catalog with which the cross-match is performed. For instance, if you are comparing magnitudes from the SDSS, you could choose the r-band de-reddened magnitudes for example.

Finally, click submit (or "Go") at the bottom of the page.

After a few moments (depending on the size of your image and the number of sources), WESIX should report back to you.

On this page, you can immediately view the image and the catalogs using Aladin.

Similarly, you can plot the data using VOPlot (e.g., see below).

Also, you can download the SEXtractor output, or the catalog data in your image, or the data which only contains the cross-matches (see the lowest translucent yellow circle).

For instance in this case, I have chosen to plot the data using VOPlot.

In this case, I chose to compare the magnitudes from SEXtractor (mag_best) to the magnitudes from the SDSS (dereddened r-band). You can select these as the two axis in the plot (see the top yellow translucent circle).

The click plot.