Description
Gaia has shown the scientific value of precision absolute and relative astrometry. Libralato et al. 2024 show the scientific potential of combining stellar astrometry from Gaia and Euclid to constrain through relative astrometry the kinematics of globular clusters.
The question of our project is: how to best obtain an absolute astrometric reference frame by combining Gaia and Euclid data on Quasi Stellar Objects (QSOs) and stars?
The advantage of QSOs in building an absolute astrometric reference frame is that they have zero proper motion. A major challenge is that in Euclid the QSOs are typically resolved. For stars the situation is the opposite: they are simply point sources but have proper motions.
Gaia provides astrometric positions, proper motions and parallaxes for 1.46 billion sources down to magnitudes of $G_{\rm Gaia}=21.5\;\rm mag$. This project can add astrometric positions of fainter QSOs and stars, down to $G_{\rm Gaia}\sim 24\;\rm mag$ from the Euclid Wide Survey.
Selecting a field of a $\sim 1 \;\rm deg^2$ observed with Euclid VIS that is well-suited to perform the research project, we research how to identify QSOs and stars in this field and how to best build an astrometric reference catalog from it.
| Talk category | NOVA Network 1 |
|---|---|
| Preference for a talk or poster | Poster |
