4MOST ChANGES high-redshift QSO candidates J/A+A/710/A170 ivo://CDS.VizieR/J/A+A/710/A170 CDS Mkrtchyan T. Mazzucchelli C. Assef R.J. Temple M.J. Rojas-Lilayu A.,Bauer F.E. Toptun V. Acevedo Barroso J.A. Belladitta S. Farina E.P.,Martinez-Ramirez L.N. Papini G. Satheesh-Sheeba S. Stern D.,Upadhyayula A. 2026-06-10T08:13:29Z 2026-06-10T09:12:57Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars active-galactic-nuclei visible-astronomy sloan-photometry infrared-astronomy redshifted The identification of high-redshift quasars (z>4.5) is critical for studying the early Universe, supermassive-black-hole growth, and cosmic reionization. Most known high-redshift quasars are located in the northern hemisphere, leaving the southern sky largely unexplored. As part of the 4-meter Multi-Object Spectroscopic Telescope (4MOST) and Chilean AGN/Galaxy Extragalactic Survey (ChANGES) S1604 survey, we aim to create a large catalog of high-redshift quasar candidates in the southern hemisphere using multiwavelength photometry and spectral-energy-distribution (SED) fitting, with the goal of spectroscopic follow-up with 4MOST. We constructed a multiband photometric catalog by combining optical data from the Dark Energy Camera Local Volume Exploration Survey (DELVE DR2) and Dark Energy Camera Legacy Survey (DECaLS DR10), near-infrared data from the VISTA Hemisphere Survey (VHS DR5) with an additional field of the VISTA Kilo-degree Infrared Galaxy Public Survey (VIKING), mid-infrared data from the Wide-field Infrared Survey Explorer (AllWISE), and optical astrometry from Gaia DR3. After applying morphological and color-based cuts to remove contaminants such as brown dwarfs and red galaxies, we performed a custom-made SED fitting using quasar and brown-dwarf templates. Statistical outputs including chi^2^, the Bayesian information criterion (BIC), and Ftest were used to rank and select candidates. Our final catalog contains 6104 high-redshift quasar candidates within the redshift range of 4.5<z<7. These sources have detections in seven or more photometric bands and satisfy our SED-based statistical selection criteria (e.g., BIC>0 and F_test_>10). Initial spectroscopic validation using the New Technology Telescope (NTT) with the ESO Faint Object Spectrograph and Camera v.2 (EFOSC2) and the Palomar Observatory Hale Telescope with the Next Generation Palomar Spectrograph (NGPS) confirmed three high-redshift quasars at z>5 out of six observed candidates. 2026A&A...710A.170M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A170 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/359 : VISTA Hemisphere Survey (VHS) catalog DR4.1 (McMahon+, 2013) II/343 : VIKING catalogue data release 2 (Edge+, 2016) II/365 : The CatWISE2020 catalog (updated version 28-Jan-2021) J/A+A/585/A87 : Quasar composite made from bright QSOs (Selsing+, 2016) J/ApJ/790/54 : AGN models according to a UV to Mid-IR study (Chung+, 2014) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/A170 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A170 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A170 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A170 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A170 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A170 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/710/A170/catalog (Catalog of high-redshift quasar candidates) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/A170/catalog? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/A170/catalog? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/A170/catalog? 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46373-46374 46376 46378 46385 46388-46389 46392-46393 46395-46396 46400 46402-46404 46421 46424-46426 46429-46431 46435 46439-46441 46443 46457-46461 46487-46488 46490-46491 46494 46496 46498 46500 46502-46504 46506 46508 46510 46521 46526 46530 46561 46603-46604 46609 46613-46615 46618-46622 46624-46625 46627-46629 46631 46633 46635 46637-46639 46645-46649 46655-46658 46670 46672 46675 46678-46679 46682 46685-46686 46689-46690 46699 46703-46706 46708 46724-46725 46727-46728 46732 46734 46744-46745 46752 46757-46758 46769-46770 46772-46773 46785-46786 46788-46790 46792 46795 46799 46801-46802 46804 46813 46820-46821 46823-46825 46829-46830 46833 46835 46840 46845 46847-46849 46851 46853 46855 46864 46965 46967 46972 46975 46978 46984 46986 47010-47012 47017-47019 47050 47054-47056 47059-47061 47063 47065-47067 47073 47075-47076 47081 47084-47085 47087 47089-47094 47096 47100 47102-47103 47147 47151-47152 47154 47162-47163 47166 47188 47190-47191 47194 47198 47202-47205 47209 47218 47223 47226 47229 47233 47239 47249 47256 47263 47278 47283-47284 47290 47299-47300 47303-47304 47307 47310 47312 47318 47320 47322 47330 47334-47336 47339-47340 47343-47344 47353 47355 47357 47362 47375 47379 47381 47383 47388-47390 47396-47397 47399-47400 47408-47409 47411 47420-47421 47423 47425 47429 47431-47432 47439 47443-47446 47449 47452 47456-47457 47462 47464-47465 47467 47475 47486 47488 47497 47503-47505 47507 47509-47510 47516 47525-47526 47572-47573 47575 47579 47581 47619-47620 47623 47639 47680 47684 47699 47705 47707-47708 47731 47737 47743 47798 47825 47864-47865 47870 47878 47912 47914 47935 47955 48000 48033 48035 48041 48111 48125 48127 48135 48139 48155-48156 48161 48170 48173 48175 48180-48181 48185 48213 48216-48217 48219 48225 48227 48229-48230 48236-48238 48248 48255 48257-48261 48265 48294 48306-48307 48309-48310 48315 48317 48319 48323-48324 48326-48327 48330-48333 48335-48336 48338-48340 48342 48350-48352 48354-48355 48358-48360 48362-48363 48372-48373 48376 48418 48424 48465 48467 48476 48488 48503 48507 48522 48527 48545-48547 48550 48555 48558 48567 48573 48593 48595-48596 48598 48601-48602 48605-48607 48611 48614 48616 48618 48623-48624 48626 48628-48630 48635 48645 48656-48657 48660 48664 48671 48705 48707-48708 48710-48711 48714-48717 48719 48730 48756 48761 48763-48765 48775 48785-48787 48808 48810 48814 48896 48898-48899 48901-48902 48908 48911 48915 48918-48919 48924-48925 48949-48951 48956-48958 48968-48969 48971 48973-48975 48979 48983-48984 48988 48990 48992-48993 49000 49006 49008-49009 49017 49022-49023 49044 49046 49052 49073 49078 49081 49086 49097 49099 49102 49105 49109 49112-49113 49116 49118 49121 49131 49149 3.830199579824256e-20 6.513807192489934e-20 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/A170?format=ascii Optical Infrared default J/A+A/710/A170/catalog Catalog of high-redshift quasar candidates recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int ObjectId Source ID from DELVE DR2 (object_id) meta.id;meta.main snrgDEC ? Signal-to-noise ratio for mag_g_decals (snr_g_decals) meta.note double nullable rmagDEC ? AB Kron r-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (mag_r_decals) mag phot.mag;em.opt.R double nullable RAJ2000 Right ascension (J2000, DELVE DR2, Drlica-Wagner et al., 2022ApJS..261...38D) (ra) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000, DELVE DR2, Drlica-Wagner et al., 2022ApJS..261...38D) (dec) deg pos.eq.dec;meta.main BDchi2min Minimum chi2 for best-fit brown dwarf template (BD_chi2_min) stat.fit.chi2;stat.min double QSOchi2min Minimum chi2 for best-fit QSO template (QSO_chi2_min) stat.fit.chi2 double zQSO Photometric redshift from best-fit QSO template (QSO_z) src.redshift.phot float Rchi2 Ratio of QSO to BD chi2; values <1 indicate better QSO fit (R_chi2) stat.fit.chi2 double Ftestvalue F-test statistic value; >10 required for selection (F_test_value) stat.fit.param double BICvalue Bayesian Information Criterion; >0 required for selection (BIC_value) stat.fit.param double E(B-V)QSO E(B-V) dust reddening of best-fit QSO template (QSO_EBV) mag phot.color.excess float EMlineQSO Emission line strength of best-fit QSO template (-2, 0, 2) (QSO_EMline) spect.line.intensity double NPoints Number of photometric bands used in SED fitting (Data_Points) meta.number int QSOPar Number of free parameters of best-fit QSO template (QSO_Par) meta.number int Prior [1/2] Source priority tier (1=higher, 2=lower confidence) (Prioritization) (1) meta.code int gmagDEL ? AB Kron g-band magnitude (DELVE DR2) (mag_g_delve) mag phot.mag;em.opt.B int nullable e_gmagDEL ? Uncertainty on mag_g_delve (magerr_g_delve) mag stat.error int nullable imagDEL ? AB Kron i-band magnitude (DELVE DR2) (mag_i_delve) mag phot.mag;em.opt.I double nullable e_imagDEL ? Uncertainty on mag_i_delve (magerr_i_delve) mag stat.error double nullable rmagDEL ? AB Kron r-band magnitude (DELVE DR2) (mag_r_delve) mag phot.mag;em.opt.R double nullable e_rmagDEL ? Uncertainty on mag_r_delve (magerr_r_delve) mag stat.error double nullable zmagDEL ? AB Kron z-band magnitude (DELVE DR2) (mag_z_delve) mag phot.mag;em.opt.I double nullable e_zmagDEL ? Uncertainty on mag_z_delve (magerr_z_delve) mag stat.error double nullable W1mag ? WISE W1 (3.4 micron) magnitude (CatWISE 2020); AB system (w1mpro) mag phot.mag;em.IR.3-4um float nullable e_W1mag ? Uncertainty on w1mpro (w1sigmpro) mag stat.error;phot.mag float nullable W2mag ? WISE W2 (4.6 micron) magnitude (CatWISE 2020); AB system (w2mpro) mag phot.mag;em.IR.4-8um float nullable e_W2mag ? Uncertainty on w2mpro (w2sigmpro) mag stat.error;phot.mag float nullable YmagV ? VHS/VIKING Y-band Petrosian magnitude; AB system (ypetromag) mag phot.mag;em.IR.J double nullable e_YmagV ? Uncertainty on ypetromag (ypetromagerr) mag stat.error double nullable JmagV ? VHS/VIKING J-band Petrosian magnitude; AB system (jpetromag) mag phot.mag;em.IR.J double nullable e_JmagV ? Uncertainty on jpetromag (jpetromagerr) mag stat.error;phot.mag double nullable HmagV ? VHS/VIKING H-band Petrosian magnitude; AB system (hpetromag) mag phot.mag;em.IR.H double nullable e_HmagV ? Uncertainty on hpetromag (hpetromagerr) mag stat.error;phot.mag double nullable KsmagV ? VHS/VIKING Ks-band Petrosian magnitude; AB system (kspetromag) mag phot.mag;em.IR.K double nullable e_KsmagV ? Uncertainty on kspetromag (kspetromagerr) mag stat.error;phot.mag double nullable gmagDEC ? AB Kron g-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (mag_g_decals) mag phot.mag;em.opt.B double nullable snrrDEC ? Signal-to-noise ratio for mag_r_decals (snr_r_decals) meta.note double nullable imagDEC ? AB Kron i-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (mag_i_decals) mag phot.mag;em.opt.I double nullable snriDEC ? Signal-to-noise ratio for mag_i_decals (snr_i_decals) meta.note double nullable zmagDEC ? AB Kron z-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (mag_z_decals) mag phot.mag;em.opt.I double nullable snrzDEC ? Signal-to-noise ratio for mag_z_decals (snr_z_decals) meta.note double nullable E(B-V) Galactic dust reddening E(B-V) from SFD maps (Schlegel et al., 1998ApJ...500..525S) (ebv) mag phot.color.excess double BDchi2 Best-fit brown dwarf template type template (MD1, MD2, MD3, BD1, BD2, BD3) (BD_chi2_) meta.id;stat.fit char