Euclid Quick Data Release (Q1): Euclid spectroscopy of quasars. 1. Identification and redshift determination of 3500 bright quasars

UNSPECIFIED (2026) Euclid Quick Data Release (Q1): Euclid spectroscopy of quasars. 1. Identification and redshift determination of 3500 bright quasars. Astronomy and Astrophysics. ISSN 1432-0746 (In Press)

Text (PUBf955fb5d35b8b32-741577-paper-draft)
PUBf955fb5d35b8b32-741577-paper-draft.pdf
Available under License Creative Commons Attribution.
Download (10MB)

Text (pdf)
2512.08803v2.pdf - Accepted Version
Available under License Creative Commons Attribution.
Download (10MB)

Abstract

The slitless spectroscopy mode of the NISP onboard Euclid has enabled efficient spectroscopy of objects within a large FoV. We present a large and homogeneous sample of bright quasars identified from the Euclid Quick Data Release (Q1) by combining high-purity candidate selections from Gaia and WISE with the NISP spectra. Through visual inspection of the Euclid spectra of these quasar candidates, we identify approximately 3500 quasars with reliable redshifts at $0