Introduction

The on-the-fly (OTF) environment of the Euclid Science Archive stores the data products processed by the Science Ground Segment that have been released for the Euclid Consortium members.

At the opening of the OTF (February 2024), the first available data are :

• (raw) Level 1 data for VIS and NISP of the PV phase

• Level 2 calibrated frames for VIS and NIR on the 3 fields EDFN, EDFS and COSMOS, as part of the the 'PV-005' survey valiadation

• MER mosaics on the same 3 field and derived MER catalogues (~25 million sources).

The description of these data products can be found on the Data Product Definition Document (DPDD) : http://st-dm.pages.euclid-sgs.uk/data-product-doc/index.html

The OTF provides a search functionality for observations, mosaics, and catalogues. Searches for observations and mosaics can be performed by target name, coordinates, observation identifier or tile index, level version, and data release version, using the options available in the user interface. For catalogues the corresponding tab provides a functionality to construct queries based on multiple conditions, and then that query can be shown and edited in the ADQL form using the ADQL language. The Cutout tab can be used to download specific regions of the images around a source. The results of the queries appear in a particular tab, where it is possible to download the products (if the user is logged in) one by one or with multiple products in a zip file.

This manual describes the ADQL form of the Search tab, introducing how to perform queries in the user interface following the ADQL language. Then the manual focuses on the possibilities of using the command line to perform queries and download images. The same can be said respect the sky visualization feature, that allows to overlay the results of the queries from the ADQL job panel. This panel includes additional features, among others to download the results in different formats, and to construct plots for selected columns.

Support

The Euclid helpdesk is available to report problems or questions on the functionality of the archive at https://support.cosmos.esa.int/euclid . It is not necessary to provide credentials to request support.

For questions related to the content of data, it is recommended to raise an issue on the Redmine system of the Euclid SGS : https://euclid.roe.ac.uk/issues/

Manual contents

• 1. Current data products ingested in the archive

• 2. Sky visualization

• 3. ADQL form and examples

• 4. ADQL from the command line

• 5. Bulk download of data

• 6. Images from the command line

• 7. Using the Data Download service

• 8. Known issues

• 9. Euclid Helpdesk