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  Finding the brightest cosmic beacons in the Southern Hemisphere

Calderone, G., Boutsia, K., Cristiani, S., Grazian, A., Amorin, R., D’Odorico, V., et al. (2019). Finding the brightest cosmic beacons in the Southern Hemisphere. The Astrophysical Journal, 887(2): 268. doi:10.3847/1538-4357/ab510a.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-1061-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-1062-9
Genre: Journal Article

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 Creators:
Calderone, Giorgio, Author
Boutsia, Konstantina, Author
Cristiani, Stefano, Author
Grazian, Andrea, Author
Amorin, Ricardo, Author
D’Odorico, Valentina, Author
Cupani, Guido, Author
Fontanot, Fabio, Author
Salvato, Mara1, Author              
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: The study of absorptions along the lines of sight to bright high-z QSOs is an invaluable cosmological tool that provides a wealth of information on the inter-/circum-galactic medium, dark matter, primordial elements, reionization, fundamental constants, and general relativity. Unfortunately, the number of bright (i ≲ 18) QSOs at z ≳ 2 in the southern hemisphere is much lower than that in the north, due to the lack of wide multiwavelength surveys at decl. δ < 0°, hampering the effectiveness of observations from southern observatories. In this work we present a new method based on Canonical Correlation Analysis to identify such objects, taking advantage of a number of available databases: Skymapper, Gaia DR2, WISE, and 2MASS. Our QSO candidate sample lists 1476 sources with i < 18 over 12,400 square degrees in the southern hemisphere. With a preliminary campaign we observed spectroscopically 69 of them, confirming 54 new bright QSOs at z > 2.5, corresponding to a success rate of our method of ~80%. Furthermore, we estimate a completeness of ~90% of our sample at completion of our observation campaign. The new QSOs confirmed by this first and the forthcoming campaigns (QUBRICS10 survey) will be the targets of subsequent studies using higher resolution spectrographs, like ESPRESSO, UVES, and (in the long term) ELT/HIRES.

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 Dates: 2019-12-26
 Publication Status: Published online
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 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/ab510a
Other: LOCALID: 3220206
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 887 (2) Sequence Number: 268 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3