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http://hdl.handle.net/20.500.12386/30113
Titolo: | Finding the Brightest Cosmic Beacons in the Southern Hemisphere | Autori: | CALDERONE, GIORGIO Boutsia, Konstantina CRISTIANI, Stefano GRAZIAN, Andrea Amorin, Ricardo D'ODORICO, Valentina CUPANI, Guido FONTANOT, Fabio Salvato, Mara |
Data pubblicazione: | 2019 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 887 | Fascicolo: | 2 | Da pagina:: | 268 | 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 (QUBRICS<SUP>10</SUP> survey) will be the targets of subsequent studies using higher resolution spectrographs, like ESPRESSO, UVES, and (in the long term) ELT/HIRES. | URI: | http://hdl.handle.net/20.500.12386/30113 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab510a | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab510a | Bibcode ADS: | 2019ApJ...887..268C | Fulltext: | open |
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