The VST ATLAS quasar survey I: Catalogue of photometrically selected quasar candidates

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dc.contributor.authorEltvedt, Alice M.
dc.contributor.authorShanks, T.
dc.contributor.authorMetcalfe, N.
dc.contributor.authorAnsarinejad, B.
dc.contributor.authorBarrientos, L. F.
dc.contributor.authorSharp, R.
dc.contributor.authorMalik, U.
dc.contributor.authorMurphy, D. N. A.
dc.contributor.authorIrwin, M.
dc.contributor.authorWilson, M.
dc.contributor.authorAlexander, D. M.
dc.contributor.authorKovacs, Andras
dc.contributor.authorGarcia-Bellido, Juan
dc.contributor.authorAhlen, Steven
dc.contributor.authorBrooks, David
dc.contributor.authorde la Macorra, Axel
dc.contributor.authorFont-Ribera, Andreu
dc.contributor.authorGontcho, Satya Gontcho a
dc.contributor.authorHonscheid, Klaus
dc.contributor.authorMeisner, Aaron
dc.contributor.authorMiquel, Ramon
dc.contributor.authorNie, Jundan
dc.contributor.authorTarle, Gregory
dc.contributor.authorVargas-Magana, Mariana
dc.contributor.authorZhou, Zhimin
dc.date.accessioned2025-01-20T20:14:24Z
dc.date.available2025-01-20T20:14:24Z
dc.date.issued2023
dc.description.abstractWe present the VST ATLAS Quasar Survey, consisting of similar to 1229 000 quasar (QSO) candidates with 16 < g < 22.5 over similar to 4700 deg(2). The catalogue is based on VST ATLAS+NEOWISE imaging surveys and aims to reach a QSO sky density of 130 deg-2 for z < 2.2 and similar to 30 deg(-2) for z > 2.2. To guide our selection, we use X-ray/UV/optical/MIR data in the extended William Herschel Deep Field (WHDF) where we find a g < 22.5 broad-line QSO density of 269 +/- 67 deg(-2), roughly consistent with the expected similar to 196 deg(-2). We find that similar to 25 per cent of our QSOs are morphologically classed as optically extended. Overall, we find that in these deep data, MIR, UV, and X-ray selections are similar to 70-90 per cent complete while X-ray suffers less contamination than MIR and UV. MIR is however more sensitive than X-ray or UV to z > 2.2 QSOs at g < 22.5 and the S-X (0.5 - 10 keV) > 1 x10(-14) ergs cm(-2) s(-1) limit of eROSITA. We adjust the selection criteria from our previous 2QDES pilot survey and prioritize VST ATLAS candidates that show both UV and MIR excess, also selecting candidates initially classified as extended. We test our selections using data from DESI (which will be released in DR1) and 2dF to estimate the efficiency and completeness, and we use ANNz2 to determine photometric redshifts. Applying over the similar to 4700 deg(2) ATLAS area gives us similar to 917 000 z < 2.2 QSO candidates of which 472 000 are likely to be z < 2.2 QSOs, implying a sky density of similar to 100 deg(-2), which our WHDF analysis suggests will rise to at least 130 deg(-2) when eROSITA X-ray candidates are included. At z > 2.2, we find similar to 310() 000 candidates, of which 169 000 are likely to be QSOs for a sky density of similar to 36 deg(-2).
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stad516
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stad516
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/92193
dc.identifier.wosidWOS:000961016300003
dc.issue.numero3
dc.language.isoen
dc.pagina.final3404
dc.pagina.inicio3384
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectcatalogues
dc.subjectsurveys
dc.subject(galaxies:) quasars: general
dc.titleThe VST ATLAS quasar survey I: Catalogue of photometrically selected quasar candidates
dc.typeartículo
dc.volumen521
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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