J/ApJS/219/39        QSOs selection from SDSS and WISE        (Richards+, 2015)

Bayesian high-redshift quasar classification from optical and mid-IR photometry. Richards G.T., Myers A.D., Peters C.M., Krawczyk C.M., Chase G., Ross N.P., Fan X., Jiang L., Lacy M., McGreer I.D., Trump J.R., Riegel R.N. <Astrophys. J. Suppl. Ser., 219, 39 (2015)> =2015ApJS..219...39R 2015ApJS..219...39R (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Photometry, SDSS ; Photometry, infrared ; Redshifts Keywords: catalogs; infrared: galaxies; methods: statistical; quasars: general Abstract: We identify 885503 type 1 quasar candidates to i≲22 using the combination of optical and mid-IR photometry. Optical photometry is taken from the Sloan Digital Sky Survey-III: Baryon Oscillation Spectroscopic Survey (SDSS-III/BOSS), while mid-IR photometry comes from a combination of data from the Wide-field Infrared Survey Explorer (WISE) "AllWISE" data release and several large-area Spitzer Space Telescope fields. Selection is based on a Bayesian kernel density algorithm with a training sample of 157701 spectroscopically confirmed type 1 quasars with both optical and mid-IR data. Of the quasar candidates, 733713 lack spectroscopic confirmation (and 305623 are objects that we have not previously classified as photometric quasar candidates). These candidates include 7874 objects targeted as high-probability potential quasars with 3.5<z<5 (of which 6779 are new photometric candidates). Our algorithm is more complete to z>3.5 than the traditional mid-IR selection "wedges" and to 2.2<z<3.5 quasars than the SDSS-III/BOSS project. Number counts and luminosity function analysis suggest that the resulting catalog is relatively complete to known quasars and is identifying new high-z quasars at z>3. This catalog paves the way for luminosity-dependent clustering investigations of large numbers of faint, high-redshift quasars and for further machine-learning quasar selection using Spitzer and WISE data combined with other large-area optical imaging surveys. Description: We construct the master quasar catalog by gathering samples of spectroscopically confirmed quasars within the SDSS-I/II/III (York et al. 2000AJ....120.1579Y 2000AJ....120.1579Y; Eisenstein et al. 2011AJ....142...72E 2011AJ....142...72E) footprint. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file master.dat 383 1604577 *Master quasar catalog (table 1) cand.dat 410 885503 *Optical+MIR photometric quasar candidates catalog (table 2) -------------------------------------------------------------------------------- Note on master.dat: original FITS file available in the FTP (file name=masterquasarcatalogs.011414.fits). Note on cand.dat: original FITS file available in the FTP (file name=opticalirquasar_candidates.052015.fits). -------------------------------------------------------------------------------- See also: II/328 : AllWISE Data Release (Cutri+ 2013) II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012) VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004) J/ApJS/213/12 : SDSS Stripe 82 co-added runs (Jiang+, 2014) J/ApJ/773/14 : BOSS: quasar luminosity function (Ross+, 2013) J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013) J/ApJS/206/4 : SED for luminous QSOs (Krawczyk+, 2013) J/ApJ/768/105 : z∼5 QSO luminosity function from SDSS (McGreer+, 2013) J/MNRAS/424/2876 : Large area KX quasar catalogue (Maddox+, 2012) J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012) J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012) J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012) J/ApJ/742/61 : Phot. redshift of AGNs from XMM- and C-COSMOS (Salvato+ 2011) J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011) J/ApJ/728/23 : GALEX UV-bright high-redshift quasars (Worseck+, 2011) J/ApJ/719/1672 : SDSS binary quasars at high redshift. I. (Hennawi+, 2010) J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010) J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010) J/ApJ/713/970 : Low-resolution SED templates for AGNs & gal. (Assef+, 2010) J/ApJ/710/1498 : QSO luminosity function at z∼4 (Glikman+, 2010) J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009) J/ApJ/696/1195 : COSMOS AGN spectroscopic survey. I. (Trump+, 2009) J/AJ/137/3884 : Quasar candidates selected from the SDSS (Richards+, 2009) J/ApJ/693/8 : High-redshift QSOs in the COSMOS survey (Brusa+, 2009) J/MNRAS/392/19 : The 2dF-SDSS QSO survey (Croom+, 2009) J/ApJS/180/67 : Phot. selection of quasars from SDSS. II. (Richards+, 2009) J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007) J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007) J/AJ/132/999 : SDSS quasar lens search (Oguri+, 2006) J/AJ/132/231 : MMT redshift survey of 24um sources (Papovich+, 2006) J/ApJ/644/100 : SDSS quasars in the COSMOS field (Prescott+, 2006) J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006) J/ApJS/155/257 : NBC Quasar Candidate Catalog (Richards+, 2004) http://www.sdss3.org/ : SDSS-III home page Byte-by-byte Description of file: master.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 12- 21 F10.6 deg DEdeg Declination in decimal degrees (J2000) 23- 26 I4 --- Run [94/8162] SDSS run number (1) 28- 30 I3 --- Rerun [301] SDSS rerun number 32 I1 --- Camcol [1/6] SDSS camera column 34- 36 I3 --- Field [11/999] SDSS field number 38- 41 I4 --- ID [1/8138] SDSS ID number within the field 43 I1 --- OT [3/6] SDSS object type (stellar=3, extended=6) (OBJC_TYPE) 45- 55 I11 --- Flags SDSS object flags (OBJC_FLAGS) (2) 57- 65 I9 --- Flags2 SDSS object flags (OBJC_FLAGS2) 67- 71 F5.3 mag Au [0.01/6.2] Magnitudes of Galactic extinction in u-band (EXTINCTION_U) 73- 77 F5.3 mag Ag [0.009/4.6] Magnitudes of Galactic extinction in g-band (EXTINCTION_G) 79- 83 F5.3 mag Ar [0.006/3.3] Magnitudes of Galactic extinction in r-band (EXTINCTION_R) 85- 89 F5.3 mag Ai [0.005/2.5] Magnitudes of Galactic extinction in i-band (EXTINCTION_I) 91- 95 F5.3 mag Az [0.003/1.8] Magnitudes of Galactic extinction in i-band (EXTINCTION_Z) 97-102 F6.1 --- Fupsf [-27.7/2882.1] PSF flux in u-band (PSFFLUX_U) 104-109 F6.1 --- Fgpsf [-10.9/8313] PSF flux in g-band (PSFFLUX_G) 111-117 F7.1 --- Frpsf [-0.6/11314.1] PSF flux in r-band (PSFFLUX_R) 119-125 F7.1 --- Fipsf [-31.1/12356.4] PSF flux in i-band (PSFFLUX_I) 127-133 F7.1 --- Fzpsf [-2.1/12640.6] PSF flux in z-band (PSFFLUX_Z) 135-139 F5.1 --- IVFu [0/232.2] Inverse variance of point-spread function flux in u-band (PSFFLUXIVARU) 141-145 F5.1 --- IVFg [0/645.8] Inverse variance of point-spread function flux in g-band (PSFFLUXIVARG) 147-151 F5.1 --- IVFr [0/307.8] Inverse variance of point-spread function flux in r-band (PSFFLUXIVARR) 153-157 F5.1 --- IVFi [0/106.8] Inverse variance of point-spread function flux in i-band (PSFFLUXIVARI) 159-161 F3.1 --- IVFz [0/8] Inverse variance of point-spread function flux in z-band (PSFFLUXIVARZ) 163-169 F7.1 --- CoAFu [-6.5/2882.1]?=-9999 Co-added point-spread function flux in u-band (PSFFLUXCLEANU) 171-177 F7.1 --- CoAFg [-11/8313]?=-9999 Co-added point-spread function flux in g-band (PSFFLUXCLEANG) 179-185 F7.1 --- CoAFr [-3/11314.1]?=-9999 Co-added point-spread function flux in r-band (PSFFLUXCLEANR) 187-193 F7.1 --- CoAFi [-4.4/12356.4]?=-9999 Co-added point-spread function flux in i-band (PSFFLUXCLEANI) 195-201 F7.1 --- CoAFz [-19.8/12640.6]?=-9999 Co-added point-spread function flux in z-band (PSFFLUXCLEANZ) 203-207 F5.1 --- IVCoAFu [0/722.2] Inverse variance of co-added point-spread function flux in u-band (PSFFLUXCLEANIVAR_U) 209-214 F6.1 --- IVCoAFg [0/2902] Inverse variance of co-added point-spread function flux in g-band (PSFFLUXCLEANIVAR_G) 216-221 F6.1 --- IVCoAFr [0/1215.2] Inverse variance of co-added point-spread function flux in r-band (PSFFLUXCLEANIVAR_R) 223-227 F5.1 --- IVCoAFi [0/579.1] Inverse variance of co-added point-spread function flux in i-band (PSFFLUXCLEANIVAR_I) 229-232 F4.1 --- IVCoAFz [0/36] Inverse variance of co-added point-spread function flux in z-band (PSFFLUXCLEANIVAR_Z) 234-235 I2 --- f_CoAFu [0/35] Flag indicating whether co-added (CLEAN) flux should be used (PSFCLEANNUSE_U) 237-238 I2 --- f_CoAFg [0/35] Flag indicating whether co-added (CLEAN) flux should be used (PSFCLEANNUSE_G) 240-241 I2 --- f_CoAFr [0/35] Flag indicating whether co-added (CLEAN) flux should be used (PSFCLEANNUSE_R) 243-244 I2 --- f_CoAFi [0/35] Flag indicating whether co-added (CLEAN) flux should be used (PSFCLEANNUSE_I) 246-247 I2 --- f_CoAFz [0/35] Flag indicating whether co-added (CLEAN) flux should be used (PSFCLEANNUSE_Z) 249-253 F5.3 --- zBest1 [0.06/5.5]?=0 First zBest value (ZBEST1) 255-259 F5.3 --- zBest2 [0.1/3.6]?=0 Second zBest value (ZBEST2) 261-265 F5.3 --- zBest3 [0.06/4.9]?=0 Third zBest value (ZBEST3) 267-271 F5.3 --- zBest4 [0.1/5.2]?=0 Fourth zBest value (ZBEST4) 273-278 F6.3 --- zBest5 [-8/5]?=0 Fifth zBest value (ZBEST5) 280-284 F5.3 --- zBest6 [0.1/4.2]?=0 Sixth zBest value (ZBEST6) 286-290 F5.3 --- zBest7 [5.7/6.5]?=0 Seventh zBest value (ZBEST7) 292-296 F5.3 --- zBest8 [0.03/5.9]?=0 Eighth zBest value (ZBEST8) 298-302 F5.3 --- zBest9 [0.1/3.9]?=0 Ninth zBest value (ZBEST9) 304-309 F6.3 --- zBest10 [-1/6.3]?=0 Tenth zBest value (ZBEST10) 311-315 F5.3 --- zBest11 [0.3/5.5]?=0 Eleventh zBest value (ZBEST11) 317-321 F5.3 --- zBest12 [0.07/3.6]?=0 Twelfth zBest value (ZBEST12) 323-327 F5.3 --- zBest13 [3.8/5.1]?=0 Thirteenth zBest value (ZBEST13) 329-333 F5.3 --- zBest14 [0.1/4.2]?=0 Fourtheenth zBest value (ZBEST14) 335-339 I5 --- r_zBest [1/10113] Redshift source flag (SOURCEBIT) (3) 341 I1 --- Uni [0/1] Indicates whether the SDSS object fell in the "uniform" selection area (SDSS_UNIFORM) (4) 343 I1 --- QSO [0/1] AGES flag (AGES_QSO) (5) 345-351 I7 --- Code06 [-782208/786384] AGES flag (AGES_CODE06) (5) 353-357 F5.2 --- zphlo [-1/6] Minimum photometric redshift (KDE_ZPHOTLO) (6) 359-363 F5.2 --- zphhi [-1/6.5] Maximum photometric redshift (KDE_ZPHOTHI) (6) 365-369 F5.2 --- zphP [-1/1] Photometric redshift probability (6) (KDE_ZPHOTPROB) 371 I1 --- UV? [0/1] Flag indicating a UV-excess or low-redshift source (KDE_LOWZORUVX) (6) 373-376 F4.2 --- zpkP [0/1] Peak of the redshift probability (XDQSOZ_PEAKPROB) (7) 378-381 F4.2 --- zpkFWHM [0/3.2] FWHM of the redshift peak (7) (XDQSOZ_PEAKFWHM) 383 I1 --- Npk [0/8] Number of peaks in photo-z distribution (XDQSOZ_NPEAKS) (7) -------------------------------------------------------------------------------- Note (1): see http://classic.sdss.org/dr7/glossary/index.html Note (2): see http://classic.sdss.org/dr7/products/catalogs/flags.html Note (3): Bitwise flag from 20 to 213 indicating the redshift source as coming from SDSS, 2QZ, AUS, AGES, COSMOS, FAN, BOSS, MMT, NBCKDE, XDQSOZ, PAPOVICH, GLIKMAN, MADDOX, respectively. Note (4): see Richards et al. (2002AJ....123.2945R 2002AJ....123.2945R) Note (5): see Kochanek et al. (2012, J/ApJS/200/8) Note (6): from Richards et al. (2009, J/ApJS/180/67) Note (7): from Bovy et al. (2012ApJ...749...41B 2012ApJ...749...41B) -------------------------------------------------------------------------------- Byte-by-byte Description of file: cand.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 F10.6 deg RAdeg Right ascension (J2000) 12- 21 F10.6 deg DEdeg Declination (J2000) 23- 28 A6 --- Class Spectral classification (QSO, GALAXY, STAR, CELG, ??, or U) (1) 30- 36 F7.5 --- zsp [0/6.7]? Spectroscopic redshift 38- 43 F6.3 mag umag [15/31.7] SDSS u-band AB magnitude, corrected for Galactic extinction 45- 50 F6.3 mag gmag [15/27.4] SDSS g-band AB magnitude, corrected for Galactic extinction 52- 57 F6.3 mag rmag [15/25.9] SDSS r-band AB magnitude, corrected for Galactic extinction 59- 64 F6.3 mag imag [14.9/25] SDSS i-band AB magnitude, corrected for Galactic extinction 66- 71 F6.3 mag zmag [15/24.5] SDSS z-band AB magnitude, corrected for Galactic extinction 73- 78 F6.3 mag 3.6mag [12.8/23.8] 3.6um AB magnitude, corrected for Galactic extinction 80- 85 F6.3 mag 4.5mag [12.5/24.2] 4.5um AB magnitude, corrected for Galactic extinction 87- 92 F6.3 mag e_umag [0.003/99.99]?=99.99 Error on u-band magnitude 94- 99 F6.3 mag e_gmag [0.003/44] Error on g-band magnitude 101-106 F6.3 mag e_rmag [0.002/18] Error on r-band magnitude 108-113 F6.3 mag e_imag [0.002/21] Error on i-band magnitude 115-120 F6.3 mag e_zmag [0.003/16] Error on z-band magnitude 122-126 F5.3 mag e_3.6mag [0.02/0.7] Error on 3.6um magnitude 128-132 F5.3 mag e_4.5mag [0.01/0.7] Error on 4.5um magnitude 134-140 F7.2 3.63uJy Fu [-101/810] SDSS u-band flux density in nanomaggies 142-147 F6.2 3.63uJy Fg [-1/759] SDSS g-band flux density in nanomaggies 149-154 F6.2 3.63uJy Fr [-0.3/805] SDSS r-band flux density in nanomaggies 156-161 F6.2 3.63uJy Fi [-0.3/979] SDSS i-band flux density in nanomaggies 163-168 F6.2 3.63uJy Fz [-4/945] SDSS z-band flux density in nanomaggies 170-177 F8.2 uJy F3.6 [1.1/25966] 3.6um flux density in microJy 179-186 F8.2 uJy F4.5 [0.8/35613] 4.5um flux density in microJy 188-192 F5.2 3.63uJy e_Fu [0.04/100] Error in u-band flux density 194-198 F5.2 3.63uJy e_Fg [0.02/54] Error in g-band flux density 200-204 F5.2 3.63uJy e_Fr [0.03/86] Error in r-band flux density 206-211 F6.2 3.63uJy e_Fi [0.04/163] Error in i-band flux density 213-218 F6.2 3.63uJy e_Fz [0.1/129] Error in z-band flux density 220-225 F6.2 uJy e_F3.6 [0.09/551] Error in 3.6um flux density 227-232 F6.2 uJy e_F4.5 [0.1/656] Error in 4.5um flux density 234-239 F6.3 mag Ymag [14.6/26]? Y-band Vega magnitude from UKIDSS or VHS (2) 241-246 F6.3 mag Jmag [13.9/21]? J-band Vega magnitude from UKIDSS or VHS (2) 248-253 F6.3 mag Hmag [13.2/20.3]? H-band Vega magnitude from UKIDSS or VHS (2) 255-260 F6.3 mag Kmag [11.8/19.6]? K-band Vega magnitude from UKIDSS or VHS (2) 262-267 F6.3 mag e_Ymag [0.003/46]? Error in Y-band magnitude 269-273 F5.3 mag e_Jmag [0.002/0.5]? Error in J-band magnitude 275-279 F5.3 mag e_Hmag [0.002/0.6]? Error in H-band magnitude 281-285 F5.3 mag e_Kmag [0.001/0.7]? Error in K-band magnitude 287-292 F6.3 mag FUV [13.7/24.8]? GALEX FUV magnitude (AB) 294-299 F6.3 mag NUV [13.8/24.8]? GALEX NUV magnitude (AB) 301-305 F5.3 mag e_FUV [0.008/0.6]? Error in FUV magnitude 307-311 F5.3 mag e_NUV [0.004/0.5]? Error in NUV magnitude 313-316 F4.1 --- gisig [-1/1]? Indicator of distance from mean g-i color at ZHOTBEST (GI_SIGMA) 318-321 F4.2 mag Au [0.01/1] Extinction in SDSS u band 323-326 F4.2 --- den* [0/1.2] Star density from KDE algorithm 328-333 F6.2 --- denq [0/402] Quasar density from KDE algorithm 335-341 F7.3 --- b_zphO [0/100] Minimum photometric redshift [ugriz] 343-349 F7.3 --- zphO [0.005/100] Best photometric redshift [ugriz] (ZPHOTBEST) 351-357 F7.3 --- B_zphO [0.01/100] Maximum photometric redshift [ugriz] 359-365 F7.3 --- zphOP [0.005/100] Probability of ZPHOTBEST being between min and max (ZPHOTPROB) 367-370 F4.2 --- b_zphIR [0/6]? Minimum photometric redshift [ugrizJHK] 372-375 F4.2 --- zphIR [0.05/6.3]? Best photometric redshift (ugrizJHK) (ZPHOTBESTJHK) 377-381 F5.3 --- B_zphIR [0.02/6.3]? Maximum photometric redshift (ugrizJHK) (ZPHOTMAXJHK) 383-386 F4.2 --- zphIRP [0.2/1]? Probability of ZPHOTBESTJHK being between min and max (ZPHOTPROBJHK) 388 I1 --- Leg [0/1] Indicates if object is in the SDSS Legacy footprint 390 I1 --- Uni [0/1] Indicates if object was selected according to Richards et al. (2002AJ....123.2945R 2002AJ....123.2945R) 392-400 I9 --- Prim [0/673192456] SDSS primary target selection flag; see Richards et al. (2002AJ....123.2945R 2002AJ....123.2945R) 402-408 F7.3 mas/yr pm [0.005/193]? Proper motion in milliarcseconds per year 410 I1 --- DB [1/7] Bitwise flag indicating low-z (20), mid-z (21), and high-z (22) sources -------------------------------------------------------------------------------- Note (1): 32 are known compact emission-line galaxies (CELGs), 5 have spectra that are difficult to classify (given as "??" in the catalog). See section 5.3 for further details. Note (2): We match our optical catalog to near-IR catalogs from the regions of sky covered by the UKIRT Infrared Deep Sky Survey (UKIDSS; Lawrence et al. 2007, see II/319) and the Vista Hemisphere Survey (VHS; McMahon 2012 Science from the Next Generation Imaging and Spectroscopic Surveys (Garching: ESO)). We used a matching radius of 1" and included only objects that have measurements in each of J, H, and K. See section 2.3. -------------------------------------------------------------------------------- History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 02-Oct-2015
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