[Paper Review] Gaia Data Release 3: Summary of the content and survey properties

Gaia Collaboration, A. Vallenari+454 more|Dipòsit Digital de la Universitat de Barcelona (Universitat de Barcelona)|Jul 30, 2022

Astronomy and Astrophysical Research122 citations

TL;DR

This paper provides an overview of Gaia Data Release 3, detailing the content of the data products and the survey properties that underpin DR3.

ABSTRACT

We present the third data release of the European Space Agency's Gaia mission, GDR3. The GDR3 catalogue is the outcome of the processing of raw data collected with the Gaia instruments during the first 34 months of the mission by the Gaia Data Processing and Analysis Consortium. The GDR3 catalogue contains the same source list, celestial positions, proper motions, parallaxes, and broad band photometry in the G, G$_{BP}$, and G$_{RP}$ pass-bands already present in the Early Third Data Release. GDR3 introduces an impressive wealth of new data products. More than 33 million objects in the ranges $G_{rvs} < 14$ and $3100

Motivation & Objective

• Motivate the documentation and dissemination of Gaia DR3 data products.
• Describe the contents and data products included in Gaia DR3.
• Summarize the survey properties and observational characteristics underlying DR3.
• Clarify data quality, processing, and validation aspects relevant to users.

Proposed method

• Provide a structured description of Gaia DR3 data products and their provenance.
• Summarize the survey properties and observational metadata that influence DR3.
• Discuss data processing pipelines and validation steps at a high level.
• Present guidance on data usage, limitations, and potential systematics for users.

Figure 1: Distribution of the mean values of $G$ for the main Gaia DR3 components shown as histograms with bins of $0.1$ mag in width. The top panel shows the histograms for the basic observational data in Gaia DR3 (spectra, radial velocities, $v_{\mathrm{broad}}$ , photometric time series). The mid

Experimental results

Research questions

• RQ1 What contents and data products are included in Gaia DR3?
• RQ2 What are the key survey properties and observational characteristics that affect DR3 data quality and interpretation?
• RQ3 How have the data been processed and validated to produce DR3?
• RQ4 What are the known limitations and considerations for users when employing DR3 data?

Key findings

• Gaia DR3 comprises a comprehensive set of data products described in the release overview.
• The survey properties and observational characteristics that underpin DR3 are summarized to aid data interpretation.
• High-level descriptions of data processing and validation workflows are provided to contextualize data quality.
• The paper outlines practical usage considerations and potential systematics relevant to Gaia DR3 data users.

Figure 2: Uncertainties on the astrometric parameters vs. $G$ for Gaia data releases 1–3 and for the future releases Gaia DR4 and Gaia DR5. The panels show from top to bottom the uncertainties in parallax, proper motion in Right Ascension, and proper motion in Declination. The uncertainties for Gaia