J/ApJS/264/9 Southern phot. quasars from DES DR2 & NIR surveys (Yang+, 2023)
A southern photometric quasar catalog from the Dark Energy Survey
Data Release 2.
Yang Q., Shen Y.
<Astrophys. J. Suppl. Ser., 264, 9 (2023)>
=2023ApJS..264....9Y 2023ApJS..264....9Y
ADC_Keywords: QSOs; Surveys; Photometry, ugriz; Redshifts
Keywords: Quasars ; Sky surveys ; Catalogs ; Redshift surveys
Abstract:
We present a catalog of 1.4 million photometrically selected quasar
candidates in the southern hemisphere over the ∼5000deg2 Dark Energy
Survey (DES) wide survey area. We combine optical photometry from the
DES second data release (DR2) with available near-infrared (NIR) and
the all-sky unWISE mid-infrared photometry in the selection. We build
models of quasars, galaxies, and stars with multivariate skew-t
distributions in the multidimensional space of relative fluxes as
functions of redshift (or color for stars) and magnitude. Our
selection algorithm assigns probabilities for quasars, galaxies, and
stars and simultaneously calculates photometric redshifts (photo-z)
for quasar and galaxy candidates. Benchmarking on spectroscopically
confirmed objects, we successfully classify (with photometry) 94.7% of
quasars, 99.3% of galaxies, and 96.3% of stars when all IR bands (NIR
YJHK and WISE W1W2) are available. The classification and photo-z
regression success rates decrease when fewer bands are available. Our
quasar (galaxy) photo-z quality, defined as the fraction of objects
with the difference between the photo-z zp and the spectroscopic
redshift zs, |Δz|=|zs-zp|/(1+zs)≤0.1, is 92.2% (98.1%) when all
IR bands are available, decreasing to 72.2% (90.0%) using optical DES
data only. Our photometric quasar catalog achieves an estimated
completeness of 89% and purity of 79% at r<21.5 (0.68 million quasar
candidates), with reduced completeness and purity at 21.5<r≲24. Among
the 1.4 million quasar candidates, 87857 have existing spectra, and
84978 (96.7%) of them are spectroscopically confirmed quasars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
skewt.dat 538 1352947 The DES DR2 skewt-QSO catalog
rmphot.dat 741 78006 Quasar targets for the Black Hole Mapper -
reverberation mapping (BHM-RM) program in SDSS-V
(Appendix A)
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Description of file:
DESSkewtQSO.fits.gz and rmphotov0.2_paper.fits.gz are the original
catalog in FITS format downloaded at:
http://quasar.astro.illinois.edu/paper_data/DES_QSO/
See also:
VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/359 : The VISTA Hemisphere Survey (VHS) catalog DR4.1 (McMahon+, 2013)
II/343 : VIKING catalogue data release 2 (Edge+, 2016)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
II/363 : The band-merged unWISE Catalog (Schlafly+, 2019)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
II/371 : The Dark Energy Survey (DES): Data Release 2 (Abbott+, 2021)
J/ApJ/651/61 : Optically thick absorbers near luminous QSOs (Hennawi+, 2006)
J/AJ/131/1 : Binary quasars in the SDSS (Hennawi+, 2006)
J/AJ/132/999 : SDSS quasar lens search (Oguri+, 2006)
J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)
J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007)
J/ApJ/719/1672 : SDSS binary quasars at high redshift. I. (Hennawi+, 2010)
J/ApJ/768/105 : z∼5 QSO lum. function from SDSS Stripe 82 (McGreer+, 2013)
J/ApJ/776/136 : QPQ VI. HI absorption of z∼2 quasars (Prochaska+, 2013)
J/AJ/154/269 : A new photo-z method for quasars in Stripe 82 (Yang+, 2017)
J/ApJS/234/1 : Cat. of M, L, & T dwarfs from PS1 3π Survey (Best+, 2018)
J/ApJ/854/160 : SDSS & DES long-term variability QSOs (Rumbaugh+, 2018)
J/ApJ/887/268 : Bright QSOs in Southern Hemisphere (Calderone+, 2019)
Byte-by-byte Description of file: skewt.dat
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Bytes Format Units Label Explanations
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1- 10 I10 --- CoadID [870246065/1700559127] Unique identifier for
the coadded objects (COADDOBJECTID)
12- 22 F11.7 deg RAdeg DES right ascension (J2000) (ALPHAWIN_J2000)
24- 34 F11.7 deg DEdeg [-67.5/5.4] DES declination (J2000)
(DELTAWIN_J2000)
36 I1 --- ClCoad [0/3]? DES morphological object classification
variable (EXTENDED_COADD) (1)
38- 43 F6.1 --- SNmax [5/9989] Max. S/N of the PSF mag in DES
(SNMAXPSF)
45- 46 I2 --- SN3 [3/11] Number of bands in DES with S/N>3
48- 51 A4 --- Phot DES photometry fitting to quasar and star
models; "PSF" or "AUTO" (PHOTOMETRY)
53- 57 A5 --- Band [grizy] DES bands (BAND_DES)
59- 66 F8.4 mag gmagPSF [-18.3/25.5]? g-band DES PSF magnitude
(MAGPSFG)
68- 75 F8.4 mag rmagPSF [14.3/25]? r-band DES PSF magnitude
(MAGPSFR)
77- 84 F8.4 mag imagPSF [14.7/24.8]? i-band DES PSF magnitude
(MAGPSFI)
86- 93 F8.4 mag zmagPSF [14.5/24]? z-band DES PSF magnitude
(MAGPSFZ)
95- 102 F8.4 mag YmagPSF [14.2/23.2]? Y-band DES PSF magnitude
(MAGPSFY)
104- 111 F8.4 mag e_gmagPSF [0.0002/1.3]? gmagPSF uncertainty
(MAGERRPSFG)
113- 120 F8.4 mag e_rmagPSF [0.0001/1.1]? rmagPSF uncertainty
(MAGERRPSFR)
122- 129 F8.4 mag e_imagPSF [0.0002/2.2]? imagPSF uncertainty
(MAGERRPSFI)
131- 138 F8.4 mag e_zmagPSF [0.0003/2.1]? zmagPSF uncertainty
(MAGERRPSFZ)
140- 147 F8.4 mag e_YmagPSF [0.0005/4]? YmagPSF uncertainty (MAGERRPSFY)
149- 155 F7.4 mag gmag [12.8/37.6]? DES AUTO g-band magnitude
(MAGAUTOG)
157- 163 F7.4 mag rmag [13/32.2]? DES AUTO r-band magnitude
(MAGAUTOR)
165- 171 F7.4 mag imag [13.6/33.1]? DES AUTO i-band magnitude
(MAGAUTOI)
173- 179 F7.4 mag zmag [13.3/33.8]? DES AUTO z-band magnitude
(MAGAUTOZ)
181- 187 F7.4 mag Ymag [12.9/33.5]? DES AUTO Y-band magnitude
(MAGAUTOY)
189- 197 E9.4 mag e_gmag [9e-5/28100] Uncertainty on gmag
(MAGERRAUTOG)
199- 207 E9.4 mag e_rmag [7e-5/271] Uncertainty on rmag (MAGERRAUTOR)
209- 217 E9.4 mag e_imag [0.0002/1493] Uncertainty on imag
(MAGERRAUTOI)
219- 227 E9.4 mag e_zmag [0.0002/2282] Uncertainty on zmag
(MAGERRAUTOZ)
229- 237 E9.4 mag e_Ymag [0.0004/9385] Uncertainty on Ymag
(MAGERRAUTOY)
239 I1 --- gISOFl [0] g-band DES flag (always "0")
(IMAFLAGSISOG)
241 I1 --- rISOFl [0] r-band DES flag (always "0")
(IMAFLAGSISOR)
243 I1 --- iISOFl [0] i-band DES flag (always "0")
(IMAFLAGSISOI)
245 I1 --- zISOFl [0] z-band DES flag (always "0")
(IMAFLAGSISOZ)
247 I1 --- YISOFl [0] Y-band DES flag (always "0")
(IMAFLAGSISOY)
249- 254 F6.2 --- sigPlx [0/5]? Gaia DR2 parallax significance (PLXSIG)
256- 261 F6.2 --- sigPM [0/5]? Gaia DR2 proper-motion significance
(PMSIG)
263- 269 F7.3 arcsec sepGaia [0/2]? Angular distance between DES and Gaia
coordinates (SEPARATION_GAIA)
271- 272 I2 --- CNT9 [0/29] Number of sources with a 9" radius
circular aperture
274- 281 F8.5 arcsec Dist [0.001/10] Angular distance to the closest
neighbor within 9"
283- 288 A6 --- CatNIR NIR survey; i.e. VHS, VIKING, LAS, 2MASS or
UHS (SURVEY_NIR)
290- 293 A4 --- BandNIR [JHKY ] NIR bands (BAND_NIR)
295 I1 --- NbNIR [0/4] Number of NIR bands (NBAND_NIR)
297- 301 F5.3 arcsec sepNIR [0/2] Angular distance between DES and NIR
coordinates (SEPARATION_NIR)
303- 310 F8.4 mag Ymag2 [12.8/23.3]? Y band (AB) magnitude (MAG_Y)
312- 319 F8.4 mag Jmag [13.8/25.4]? J-band (AB) magnitude (MAG_J)
321- 328 F8.4 mag Hmag [13/24.1]? H-band (AB) magnitude (MAG_H)
330- 337 F8.4 mag Kmag [12.3/22.7]? K band (AB) magnitude (MAG_K)
339- 346 F8.4 mag e_Ymag2 [0.001/0.7]? Uncertainty on Ymag (MAGERR_Y)
348- 355 F8.4 mag e_Jmag [0.001/8]? Uncertainty on Jmag (MAGERR_J)
357- 364 F8.4 mag e_Hmag [0.0009/5]? Uncertainty on Hmag (MAGERR_H)
366- 373 F8.4 mag e_Kmag [0.0009/2.2]? Uncertainty on Kmag (MAGERR_K)
375- 378 A4 --- BandW [W1/W2 ] WISE bands (BAND_WISE)
380 I1 --- NbW [0/2] Number of WISE bands (NBAND_WISE)
382- 388 F7.3 arcsec sepWISE [0/2]? Angular distance between DES and
unWISE coordinates (SEPARATION_WISE)
390- 397 F8.4 mag W1mag [11.3/22.5]? WISE W1 (3.4um) band (AB)
magnitude (MAG_W1)
399- 406 F8.4 mag W2mag [10.7/21.5]? WISE W2 (4.6um) band (AB)
magnitude (MAG_W2)
408- 415 F8.4 mag e_W1mag [0.0003/0.5]? Uncertainty on W1mag (MAGERR_W1)
417- 424 F8.4 mag e_W2mag [-1.5/0.5]? Uncertainty on W2mag (MAGERR_W2)
426- 438 A13 --- Comb DES, NIR, and MIR band combination
(COMBINATION)
440 A1 --- Ref [grizy] DES reference band (REFERENCE_BAND)
442- 446 F5.3 --- Pqso [0.3/1] PQSO, skewt-QSO probability fitting
to QSO models, described in Equation (10)
(P_QSO)
448- 451 F4.2 --- zphotQ [0.1/7.4] Quasar photo-z (PHOTOZ_QSO)
453- 456 F4.2 --- z1Q [0.05/7.2] Lower limit of quasar photo-z
(Z1_QSO)
458- 461 F4.2 --- z2Q [0.15/7.9]? Upper limit of quasar photo-z
(Z2_QSO)
463- 470 E8.3 --- PzQ [1e-7/1] Probability of quasar photo-z
locating within (z1Q, z2Q), described in
Equation (5) (PQSOZ)
472- 479 E8.3 --- Pgal [6e-21/0.5] PGalaxy, skewt-QSO probability
fitting to galaxy models (P_GALAXY)
481- 484 F4.2 --- zphotG [0.02/1.5] Galaxy photo-z (PHOTOZ_GALAXY)
486- 489 F4.2 --- z1G [0.01/1.5] Lower limit of galaxy photo-z
(Z1_GALAXY)
491- 494 F4.2 --- z2G [0.03/1.5]? Upper limit of galaxy photo-z
(Z2_GALAXY)
496- 503 E8.3 --- PzG [5e-7/1] Probability of galaxy photo-z
locating within (z1G, z2G), described in
Equation (7) (PGALAXYZ)
505- 512 E8.3 --- Pstar [5e-17/0.5] PStar, skewt-QSO probability
fitting to star models (P_STAR)
514- 521 F8.4 --- zsp [0.0038/6.9]? Spectroscopic redshift (Z_SPEC)
523- 531 A9 --- Catzsp Spectroscopic redshift catalog, i.e., SDSS,
Milliquas, or LAMOST (ZSPECCAT)
533- 538 A6 --- Clsp Spectroscopic classification (i.e.
84978 "QSO", 2261 "Galaxy" and 618 "Star")
(CLASS_SPEC)
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Note (1): DES morphological object classification as follows:
0 = high confidence pointed-like (662,859 occurrences)
1 = likely pointed-like (53,378 occurrences)
2 = likely extended (116,238 occurrences)
3 = high confidence extended (520,472 occurrences)
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Byte-by-byte Description of file: rmphot.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Field Field identifier (FIELD_NAME)
10- 13 A4 --- r_pos Fiducial coordinates reference, priority:
Gaia>DES>PS1>NSC (POS_REF)
15- 25 F11.7 deg RAdeg [6.9/216.7] Fiducial right ascension (J2000)
(RA)
27- 37 F11.7 deg DEdeg [-68.4/55] Fiducial declination (J2000) (DEC)
39- 44 F6.4 deg Dist [0.018/1.8] Angular distance from the field
center (DISTANCE)
46- 53 F8.5 mag E(B-V) [0.003/0.32]?=- Galactic reddening E(B-V)
from Schlegel+ (1998ApJ...500..525S 1998ApJ...500..525S) (EBV)
55- 56 I2 --- DES A flag set to 1 if in DES photometric catalog
58- 64 F7.4 mag gmagDES [13.7/25]?=- g-band DES PSF magnitude
(DES_MAGg)
66- 72 F7.4 mag rmagDES [14.5/24.2]?=- r-band DES PSF magnitude
(DES_MAGr)
74- 80 F7.4 mag imagDES [14.3/23.7]?=- i-band DES PSF magnitude
(DES_MAGi)
82- 88 F7.4 mag zmagDES [14/23]?=- z-band DES PSF magnitude (DES_MAGz)
90- 96 F7.4 mag YmagDES [11.7/22.6]?=- Y-band DES PSF magnitude
(DES_MAGY)
98- 104 F7.4 mag e_gmagDES [0.0002/0.3]?=- gmagDES uncertainty
(DES_MAGERRg)
106- 112 F7.4 mag e_rmagDES [0.0002/0.25]?=- rmagDES uncertainty
(DES_MAGERRr)
114- 120 F7.4 mag e_imagDES [0.0002/0.24]?=- imagDES uncertainty
(DES_MAGERRi)
122- 128 F7.4 mag e_zmagDES [0.0002/0.25]?=- zmagDES uncertainty
(DES_MAGERRz)
130- 136 F7.4 mag e_YmagDES [0.0001/0.5]?=- YmagDES uncertainty
(DES_MAGERRY)
138- 139 I2 --- PS1 A flag set to 1 if in PS1 photometric catalog
141- 147 F7.4 mag gmagPS1 [12.2/29.2]?=- g-band PS1 PSF magnitude
(PS1_MAGg)
149- 155 F7.4 mag rmagPS1 [10.5/27.7]?=- r-band PS1 PSF magnitude
(PS1_MAGr)
157- 163 F7.4 mag imagPS1 [10.6/23.6]?=- i-band PS1 PSF magnitude
(PS1_MAGi)
165- 171 F7.4 mag zmagPS1 [11/28.7]?=- z-band PS1 PSF magnitude
(PS1_MAGz)
173- 179 F7.4 mag ymagPS1 [9.7/26.6]?=- y-band PS1 PSF magnitude
(PS1_MAGy)
181- 189 F9.4 mag e_gmagPS1 [0.0003/1135]?=- gmagPS1 uncertainty
(PS1_MAGERRg)
191- 199 F9.4 mag e_rmagPS1 [0.0002/17]?=- rmagPS1 uncertainty
(PS1_MAGERRr)
201- 209 F9.4 mag e_imagPS1 [0.0002/0.5]?=- imagPS1 uncertainty
(PS1_MAGERRi)
211- 219 F9.4 mag e_zmagPS1 [0.0002/66]?=- zmagPS1 uncertainty
(PS1_MAGERRz)
221- 229 F9.4 mag e_ymagPS1 [0.0003/205]?=- ymagPS1 uncertainty
(PS1_MAGERRy)
231- 232 I2 --- NSC A flag set to 1 if in NSC catalog
234- 240 F7.4 mag gmagNSC [11.3/24.5]?=- g-band NSC PSF magnitude
(NSC_MAGg)
242- 248 F7.4 mag rmagNSC [11.5/24.4]?=- r-band NSC PSF magnitude
(NSC_MAGr)
250- 256 F7.4 mag imagNSC [11.4/23.8]?=- i-band NSC PSF magnitude
(NSC_MAGi)
258- 264 F7.4 mag zmagNSC [11/23.7]?=- z-band NSC PSF magnitude
(NSC_MAGz)
266- 272 F7.4 mag YmagNSC [10.9/22.6]?=- Y-band NSC PSF magnitude
(NSC_MAGY)
274- 280 F7.4 mag e_gmagNSC [0.0001/0.3]?=- gmagNSC uncertainty
(NSC_MAGERRg)
282- 288 F7.4 mag e_rmagNSC [0.0002/0.3]?=- rmagNSC uncertainty
(NSC_MAGERRr)
290- 296 F7.4 mag e_imagNSC [0.0001/0.3]?=- imagNSC uncertainty
(NSC_MAGERRi)
298- 304 F7.4 mag e_zmagNSC [0.0001/0.3]?=- zmagNSC uncertainty
(NSC_MAGERRz)
306- 312 F7.4 mag e_YmagNSC [0.0002/0.3]?=- YmagNSC uncertainty
(NSC_MAGERRY)
314- 315 I2 --- SDSS A flag set to 1 if in SDSS photometric
catalog
317- 323 F7.4 mag umagSDSS [10.9/26.6]?=- u-band SDSS PSF magnitude
(SDSS_MAGu)
325- 331 F7.4 mag gmagSDSS [9.8/26.3]?=- g-band SDSS PSF magnitude
(SDSS_MAGg)
333- 339 F7.4 mag rmagSDSS [9.4/25.6]?=- r-band SDSS PSF magnitude
(SDSS_MAGr)
341- 347 F7.4 mag imagSDSS [9.8/24.4]?=- i-band SDSS PSF magnitude
(SDSS_MAGi)
349- 355 F7.4 mag zmagSDSS [9.5/24]?=- z-band SDSS PSF magnitude
(SDSS_MAGz)
357- 364 F8.4 mag e_umagSDSS [0.0004/431]?=- umagSDSS uncertainty
(SDSS_MAGERRu)
366- 373 F8.4 mag e_gmagSDSS [0.0001/438]?=- gmagSDSS uncertainty
(SDSS_MAGERRg)
375- 382 F8.4 mag e_rmagSDSS [0.0001/17]?=- rmagSDSS uncertainty
(SDSS_MAGERRr)
384- 391 F8.4 mag e_imagSDSS [0.0001/646]?=- imagSDSS uncertainty
(SDSS_MAGERRi)
393- 400 F8.4 mag e_zmagSDSS [0.0002/42]?=- zmagSDSS uncertainty
(SDSS_MAGERRz)
402- 403 I2 --- GCat A flag set to 1 if in Gaia photometric catalog
405- 411 F7.4 mag Gmag [6.8/21.8]?=- Gaia G-band magnitude
(GaiaMAGG)
413- 419 F7.4 mag BPmag [6.9/23]?=- Gaia BP-band magnitude
(GaiaMAGGBP)
421- 427 F7.4 mag RPmag [6.7/23]?=- Gaia RP-band magnitude
(GaiaMAGGRP)
429- 435 F7.4 mag e_Gmag [0.0001/0.08]?=- Uncertainty on the Gmag
(GaiaMAGERRG)
437- 443 F7.4 mag e_BPmag [0.0001/28]?=- Uncertainty on the BPmag
(GaiaMAGERRGBP)
445- 451 F7.4 mag e_RPmag [0.0001/26]?=- Uncertainty on the RPmag
(GaiaMAGERRGRP)
453- 460 F8.4 --- sigPlx [0/552]?=- Gaia DR2 parallax significance
(PLXSIG)
462- 469 F8.3 --- sigPM [0.01/4366]?=- Gaia DR2 proper-motion
significance (PMSIG)
471- 472 I2 --- WISE A flag set to 1 if in WISE photometric catalog
474- 480 F7.4 mag W1mag [6.6/20.2]?=- WISE W1 (3.4um) band magnitude
(Vega) (WISE_MAGW1)
482- 488 F7.4 mag W2mag [6.3/18.4]?=- WISE W2 (4.6um) band magnitude
(Vega) (WISE_MAGW2)
490- 496 F7.4 mag e_W1mag [0.0002/0.4]?=- Uncertainty on the W1mag
(WISE_MAGERRW1)
498- 504 F7.4 mag e_W2mag [0.0005/0.3]?=- Uncertainty on the W2mag
(WISE_MAGERRW2)
506- 511 F6.3 arcsec sepWISE [0.003/2]?=- Angular distance between WISE
and the fiducial coordinates
(SEPARATION_WISE)
513- 514 I2 --- NIR A flag set to 1 if in NIR photometric catalog
516- 521 A6 --- CatNIR NIR survey (SURVEY_NIR)
523- 532 E10.4 mag Ymag [10.5/21.7]?=- Y band (Vega) magnitude
(NIR_MAGY)
534- 543 E10.4 mag Jmag [9.6/21.4]?=- J-band (Vega) magnitude
(NIR_MAGJ)
545- 554 E10.4 mag Hmag [10/20.6]?=- H-band (Vega) magnitude
(NIR_MAGH)
556- 565 E10.4 mag Kmag [9.5/21.4]?=- K band (Vega) magnitude
(NIR_MAGK)
567- 576 E10.4 mag e_Ymag [0.0003/0.6]?=- Uncertainty on the Ymag
(NIR_MAGERRY)
578- 587 E10.4 mag e_Jmag [0.0002/1]?=- Uncertainty on the Jmag
(NIR_MAGERRJ)
589- 598 E10.4 mag e_Hmag [0.0004/0.5]?=- Uncertainty on the Hmag
(NIR_MAGERRH)
600- 609 E10.4 mag e_Kmag [0.0004/0.6]?=- Uncertainty on the Kmag
(NIR_MAGERRK)
611- 616 F6.3 arcsec sepNIR [0.002/2]?=- Angular distance between NIR
and the fiducial coordinates (SEPARATION_NIR)
618- 621 A4 --- CatOpt Optical survey used in skewt-QSO, e.g., DES,
PS1, Gaia, NSC (OPTICAL_SURVEY)
623- 629 F7.4 mag imag [10.5/24.4]?=- i-band PSF magnitude (MI)
631 I1 --- Nopt [3/5] Number of optical bands used in
skewt-QSO (NBAND_OPTICAL)
633- 649 A17 --- Comb Optical, NIR, and MIR survey combination
(Combination)
651- 658 F8.4 --- logQSO [-37.2/5.2] Natural logarithmic probability
of a target fitting to QSO (Equation (9))
(LOG_QSO)
660- 664 F5.3 --- Pqso [0.3/1] PQSO, skewt-QSO probability fitting
to QSO models, described in Equation (10)
(P_QSO)
666- 673 F8.6 --- Pstar [0/0.5] PStar, skewt-QSO probability fitting
to star models (P_STAR)
675- 683 E9.4 --- Pgal [8.4e-9/0.5] PGalaxy, skewt-QSO probability
fitting to galaxy models (P_GALAXY)
685- 693 F9.6 --- PqGaia [/1]?=-9 P_QSO using Gaia/NSC photometric
data (for the S-CVZ field) (PQSOGaia)
695- 703 F9.6 --- PsGaia [/1]?=-9 P_Star using Gaia/NSC photometric
data (for the S-CVZ field) (PSTARGaia)
705- 713 F9.6 --- PgalGaia [/1]?=-9 Galaxy using Gaia/NSC photometric
data (for the S-CVZ field) (PGALAXYGaia)
715- 719 F5.3 --- zphotQ [0.1/6.5] Quasar photo-z (PHOTOZ_QSO)
721- 725 F5.3 --- z1Q [0.05/6] Lower limit of quasar photo-z
(z1_QSO)
727- 731 F5.3 --- z2Q [0.1/6.3]? Upper limit of quasar photo-z
(z2_QSO)
733- 741 E9.4 --- Pqsoz [8e-7/1] Probability of quasar photo-z
locating within (z1QSO, z2QSO), described in
Equation (5) (PQSOz)
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History:
FITS files downloaded at:
http://quasar.astro.illinois.edu/paper_data/DES_QSO/
(End) Emmanuelle Perret [CDS] 03-Mar-2023