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  The Spectroscopic Follow-up of the QUBRICS Bright Quasar Survey

Boutsia, K., Grazian, A., Calderone, G., Cristiani, S., Cupani, G., Guarneri, F., et al. (2020). The Spectroscopic Follow-up of the QUBRICS Bright Quasar Survey. Astrophysical Journal Supplement Series, 250(2): 26. doi:10.3847/1538-4365/abafc1.

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Boutsia, Konstantina, Author
Grazian, Andrea, Author
Calderone, Giorgio, Author
Cristiani, Stefano, Author
Cupani, Guido, Author
Guarneri, Francesco, Author
Fontanot, Fabio, Author
Amorin, Ricardo, Author
D’Odorico, Valentina, Author
Giallongo, Emanuele, Author
Salvato, Mara1, Author              
Omizzolo, Alessandro, Author
Romano, Michael, Author
Menci, Nicola, Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We present the results of the spectroscopic follow-up of the QUasars as BRIght beacons for Cosmology in the Southern Hemisphere (QUBRICS; Calderone et al. 2019) survey. The selection method is based on a machine-learning approach applied to photometric catalogs, covering an area of ~12,400 deg2 in the Southern Hemisphere. The spectroscopic observations started in 2018 and identified 55 new, high-redshift (z ≥ 2.5), bright (i ≤ 18) quasi-stellar objects (QSOs), with the catalog published in late 2019. Here we report the current status of the survey, bringing the total number of bright QSOs at z ≥ 2.5 identified by QUBRICS to 224. The success rate of the QUBRICS selection method, in its most recent training, is estimated to be 68%. The predominant contaminant turns out to be lower-z QSOs at z < 2.5. This survey provides a unique sample of bright QSOs at high z available for a number of cosmological investigations. In particular, carrying out the redshift drift measurements (Sandage Test) in the Southern Hemisphere, using the High Resolution Spectrograph at the 39 m Extremely Large Telescope appears to be possible with less than 2500 hr of observations spread over 30 targets in 25 yr.

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 Dates: 2020-09-29
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4365/abafc1
Other: LOCALID: 3270375
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Title: Astrophysical Journal Supplement Series
Source Genre: Journal
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Publ. Info: Chicago : Published by the University of Chicago Press for the American Astronomical Society.
Pages: - Volume / Issue: 250 (2) Sequence Number: 26 Start / End Page: - Identifier: ISSN: 0067-0049
CoNE: https://pure.mpg.de/cone/journals/resource/954922828211