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Since 15 Dec 2015 the XXL database was opened for public access

The first data release (DR1) occurred at the same time of the submission to arXiv of the papers for the XXL special issue of A&A.

A second data release (DR2) has occurred on 4 Oct 2018 in conjunction with a second XXL special issue of A&A.

Follow the simple instructions below (the buttons open and close the relevant section).

  • content of the DR1 release
    The DR1 release contains the following database tables, associated to the relevant XXL papers published at the same time.

    Database table
    Description
    Paper
    XXL_100_GC The 100 brightest clusters master catalogue II III XIII
    XXL_1000_AGN The 1000 brightest X-ray point sources VI
    XXL_VLA_15 The VLA 3GHz catalogue of supercluster XLSSC-e IX
    XXL_ATCA_15 The ATCA pilot sample in XXL-S XI
    XXL_AAOmega_15The AAOmega redshift catalogue in XXL-S (1st part) XIV
    xxlpointings The list of XXL XMM pointings I

    X-ray data products advertised in Paper I are associated to table xxlpointings.

    All tables are also available at CDS under the collective heading of catalogue IX/49

  • content of the DR2 release NEW!
    The DR2 release will contain the following database tables, associated to the relevant XXL papers published at the same time.

    Database table
    Description
    Paper
    XXL_365_GC The 365 brightest clusters master catalogue XX
    3XLSS* The 3XLSS X-ray point source catalogue XXVII
    3XLSSOPTN 3XLSSOPTSMultiwave catalogues for XXL-N and XXL-S XXVII
    XXL_AAOmega_16The AAOmega redshift catalogue in XXL-S (2nd part) XXVII
    XXL_ATCA_16_srcFinal ATCA 2.1GHz catalogue in XXL-S XVIII
    XXL_ATCA_16_compsrc=radio sources; comp=radio components
    XXL_ATCA_16_ctptOptical-NIR counterparts of ATCA 2.1GHz sources XXVI
    XXL_GMRT_17 GMRT 610MHz catalogue in XXL-N XXIX
    xxlpointings The list of XXL XMM pointings with astrometric offsets XXVII

    X-ray data products advertised in Paper XXVII are associated to tables xxlpointings or 3XLSS.
    Multiwave data products advertised in same Paper XXVII are associated to tables 3XLSSOPTN or 3XLSSOPTS.

    All tables are also available at CDS under the collective heading of catalogue IX/52

  • please register to access
    New public users interested in accessing public (DR1, DR2) XXL data related to the first or second batch of XXL papers should note what follows:

    • They shall register to the public group, pressing the Login button
      then clicking on new registration to public area
      then filling in the form, submitting it pressing Register
      then wait for the confirmation e-mail and act as instructed in it
    • Once registered they can login whenever they want in the public group.
    • It is advised to read the general help file (pressing the Help button)

    • Users unable to register because of firewall setting at their side, can as last resort use username public pw public (this will be enabled in the future)

    See also animated PDF tutorial (animation works in full screen)

  • to access and retrieve the catalogues
    Soon after access (or later at any time via the New query or Modify query) you are shown the Tables page, which lists the DR1 or DR2 database tables.
    • if you put the mouse on a table name you will see a short table tip
    • if you click on a table name this opens a detailed table help page
    • if you tick the tick box near the table name (one at a time) you are selecting the table for retrieval.

    • then click on Get all columns to retrieve the entire table, or click Simple or Advanced query to perform a database query (consult the general Help file).
    • the Query results page will offer you the possibilities to View Data on the screen or to Save As FITS or ASCII files.
    • The User data page allows you to download or delete the generated file immediately or later. Please delete after download.


    See also animated PDF tutorial (animation works in full screen)

  • to access and retrieve data products
    The data products released in DR1 according to XXL Paper I are for each XMM pointing, soft and hard band, MOS1, MOS2 and pn camera):
    • (photon) X-ray images (per band)
    • (smoothed) wavelet images (per band)
    • exposure maps (per XMM camera and per band)

    The same data products are released in DR2 also associated to each source in 3XLSS (but still one set of images per pointing per band).
    In addition DR2 releases also, for each X-ray source in 3XLSSOPTN or 3XLSSOPTS:

    • a repository with FITS thumbnail images in various optical, IR and UV bands
    • eventual links to SIMBAD
    • eventual links to NED

    Data products can be retrieved as individual images or packed in a tar file as explained below:
    See also animated PDF tutorial (animation works in full screen)

    • To retrieve the data products for a set of pointings one should issue any valid query on table xxlpointings returning one, a few, or all pointings, then
    • From the Query Results page press View data, then Object Related Files in the rightmost columns for the pointing of interest, then open the little folders until you see the name of the fits.gz file to download
    • Alternately from the Query Results page press Retrieve all objects related files, then open the folder of the category of interest, click on "online generation", enter a valid .tar.gz file name, and download it (soon or later at any time via the User data button).
    • Note the .tar.gz file will contain all images of all bands/cameras for all pointings returned by the query. If this number is large, performance is not guaranteed. Please act carefully (and delete after download).

    Similarly if the query is performed on one of the catalogues for one or more X-ray sources, the data products for the relevant pointings or sources will be returned, typically as cumulative .tar.gz files.

    For 3XLSSOPTN or 3XLSSOPTS individual thumbnail repositories and the SIMBAD/NED links (which cannot be accessed in the tar files) can be accessed via View data only if one ticks the tick box showing up at the bottom of the Tables page, labelled Show member tables (and data products!) also

The original news file for the XXL DB in Milan is here