Spectroscopy of QUBRICS quasar candidates: 1672 new redshifts and a golden sample for the Sandage test of the redshift drift
Date Issued
2023
Author(s)
•
•
•
•
Boutsia, Konstantina
•
•
•
•
•
Martins, Carlos J. A. P.
•
Marques, Catarina M. J.
•
•
Trost, Andrea
Abstract
The QUBRICS (QUasars as BRIght beacons for Cosmology in the Southern hemisphere) survey aims at constructing a sample of the brightest quasars with $z \lower.5ex\hbox{$\,\, \buildrel\gt \over \sim \,\,$}2.5$, observable with facilities in the Southern Hemisphere. QUBRICS makes use of the available optical and IR wide-field surveys in the South and of Machine Learning techniques to produce thousands of bright quasar candidates of which only a few hundred have been confirmed with follow-up spectroscopy. Taking advantage of the recent Gaia Data Release 3, which contains 220 million low-resolution spectra, and of a newly developed spectral energy distribution fitting technique, designed to combine the photometric information with the Gaia spectroscopy, it has been possible to measure 1672 new secure redshifts of QUBRICS candidates, with a typical uncertainty of σz = 0.02. This significant progress of QUBRICS brings it closer to (one of) its primary goals: providing a sample of bright quasars at redshift 2.5 < z < 5 to perform the Sandage test of the cosmological redshift drift. A Golden Sample of seven quasars is presented that makes it possible to carry out this experiment in about 1500 h of observation in 25 yr, using the ANDES spectrograph at the 39m ELT, a significant improvement with respect to previous estimates.
Volume
522
Issue
2
Start page
2019
Issn Identifier
0035-8711
Ads BibCode
2023MNRAS.522.2019C
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
cristiani2023.pdf
Description
Pdf editoriale
Size
2.47 MB
Format
Adobe PDF
Checksum (MD5)
8cea43fb5519b104f1c97d4d33db6b4c