1. Overview of Euclid Data Products
Euclid is an ESA space mission (with NASA participation) studying the geometry and history of the universe through high-resolution imaging and slitless spectroscopy. Its near-infrared instrument NISP (Near-Infrared Spectrometer and Photometer) is paired with a visible-band imager (VIS); their data are combined through the MER (merging) pipeline into multi-band photometric catalogs and mosaics. Quick Data Release 1 (Q1) is the first wide-area public release from the mission.
This overview walks through what's in Q1. The rest of the series covers how to access the data — through the Data Explorer, the Python Firefly client, the Fornax compute platform, and cloud-hosted copies — and closes with two example science cases (galaxy clusters and AGNs).
2. Euclid Data Explorer
The Euclid Data Explorer at IRSA provides an interactive graphical interface for specifying search constraints, submitting queries, and visualizing data released by Euclid. The video playlist below walks through using the Explorer to find and inspect Q1 data.
3. Python Firefly Data Access
Firefly is an open-source, web-based UI library for astronomical data archive access and visualization, developed at Caltech/IPAC. The short video below introduces its Python interface for accessing Q1 data programmatically.
4. Fornax Sizzle Reel
The Fornax Initiative is a NASA-supported, web-based application that provides cloud computing, data storage, and interactive data analysis. It brings NASA's archival data, compute, and software together in one place so astronomers can focus on the science rather than infrastructure.
5. Accessing Euclid Data in the Cloud
IRSA maintains copies of the Euclid Q1 data products both on-premises at IPAC and on the cloud via Amazon Web Services. The companion notebook introduces cloud access to Q1 — retrieving image cutouts, spectra, and catalogs directly from S3 with s3fs and astroquery — demonstrated here running on the Fornax platform introduced above.
(a) Part 1: Intro, Images, and Spectra
(b) Part 2: Catalogs
6. Science Case: Euclid Galaxy Clusters
A walkthrough of galaxy cluster detection and validation using Euclid Q1's merged multi-wavelength mosaics. The companion notebook selects a known cluster alongside a control field, then applies clustering algorithms, color-magnitude diagrams, spectral extraction, and cross-matches with external databases to confirm the galaxy overdensity.
7. Science Case: Euclid AGNs
A walkthrough of comparing AGN selection techniques on a self-organizing map (SOM) built from Euclid Q1 multi-band colors. The companion notebook projects independently selected AGN candidates onto the SOM to show where different selection methods are locally enriched in a common color space.