VII/269 SDSS Quasar Catalog, DR9Q (Paris+, 2012)
The Sloan Digital Sky Survey Quasar Catalog: ninth data release.
Paris I., Petitjean P., Aubourg E., Bailey S., Ross N.P., Myers A.D.,
Strauss M.A., Anderson S.F., Arnau E., Bautista J., Bizyaev D.,
Bolton A.S., Bovy J., Brandt W.N., Brewington H., Brownstein J.R.,
Busca N., Capellupo D., Carithers W., Croft R.A.C., Dawson K.,
Delubac T., Ebelke G., Eisenstein D.J., Engelke P., Fan X., Filiz Ak N.,
Finley H., Font-Ribera A., Ge J., Gibson R.R., Hall P.B., Hamann F.,
Hennawi J.F., Ho S., Hogg D.W., Ivezic Z., Jiang L., Kimball A.E.,
Kirky D., Kirkpatrick J.A., Lee K-G., Le Goff J.-M., Lundgren B.,
MacLeod C.L., Malanushenko E., Malanushenko V., Maraston C.,
McGreer I.D., McMahon R.G., Miralda-Escude J., Muna D., Noterdaeme P.,
Oravetz D., Palanque-Delabrouille N., Pan K., Perez-Fournon I.,
Pieri M.M., Richards G.T., Rollinde E., Sheldon E.S., Schlegel D.J.,
Schneider D.P., Slosar A., Shelden A., Shen Y., Simmons A., Snedden S.,
Suzuki N., Tinker J., Viel M., Weaver B.A., Weinberg D.W., White M.,
Wood-Vasey W.M., Yeche C.
<Astron. Astrophys. 548, A66 (2012)>
=2012A&A...548A..66P 2012A&A...548A..66P
ADC_Keywords: Surveys ; QSOs ; Active gal. nuclei ; Spectroscopy
Keywords: catalogs - surveys - quasars: general
Abstract:
We present the Data Release 9 Quasar (DR9Q) catalog from the Baryon
Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky
Survey III. The catalog includes all BOSS objects that were targeted
as quasar candidates during the survey, are spectroscopically confirmed
as quasars via visual inspection. This catalog contains 87,822 quasars
(78,086 are new discoveries) detected over 3,275°2 with robust
identification and redshift measured by a combination of principal
component eigenspectra newly derived from a training set of 8,632
spectra from SDSS-DR7. The number of quasars with z>2.15 (61,931) is
2.8 times larger than the number of z>2.15 quasars previously known.
Redshifts and FWHMs are provided for the strongest emission lines
(CIV, CIII], MgII). The catalog identifies 7,533 broad absorption line
quasars and gives their characteristics. For each object the catalog
presents five-band (u,g,r,i,z) CCD-based photometry with typical
accuracy of 0.03mag, and information on the morphology and selection
method. The catalog also contains X-ray, ultraviolet, near-infrared,
and radio emission properties of the quasars, when available, from
other large-area surveys. We also provide a supplemental list of an
additional 949 quasars that have been identified, among galaxy targets
of the BOSS or among quasar targets after DR9 was frozen.
Description:
The SDSS-DR9 Quasar Catalog presents photometric and spectroscopic
properties of 87,822 quasars observed by the SDSS-III/BOSS survey. We
provide the catalog in the form of a fits file but also an ascii file.
We also provide a supplemental list containing 949 quasars with
exactly the same format as the main catalog.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
dr9q.dat 1174 87822 Main DR9 Quasar catalog (corrected version -
10-Feb-2016)
dr9q.fits 2880 29662 Main DR9 Quasar catalog, FITS format
dr9qsup.dat 656 949 Supplemental list
dr9q_sup.fits 2880 349 Supplemental list, FITS format
--------------------------------------------------------------------------------
See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/A+A/547/L1 : SDSS-III DR9 DLA catalogue (Noterdaeme+, 2012)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: dr9q.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS SDSS-DR9 designation (HHMMSS.ss+DDMMSS.s)
20- 29 F10.6 deg RAdeg Right ascension (J2000.0)
31- 39 F9.6 deg DEdeg Declination (J2000.0)
41- 49 I9 --- THINGID [26159535/512342668] Unique identifier
51- 54 I4 --- Plate SDSS Plate number
56- 60 I5 --- MJD SDSS Spectroscopic MJD
62- 65 I4 --- Fiber SDSS Fiber number
67- 72 F6.4 --- z.v Visual inspection redshift
74- 80 F7.4 --- z.b BOSS pipeline redshift
82- 89 F8.4 --- e_z.b ?=-1 Error on pipeline redshift
91- 93 I3 --- f_z.b [0/196] zwarning flag (G2)
95- 101 F7.4 --- z.p ?=-1 PCA redshift (G3)
103- 109 F7.4 --- e_z.p ?=-1 Error on PCA redshift (G3)
111- 117 F7.4 --- qCont [0/1]?=-1 Quality of PCA continuum (G3)
119- 125 F7.4 --- zCIV ?=-1 CIV redshift
127- 133 F7.4 --- zCIII ?=-1 CIII] complex redshift
135- 141 F7.4 --- zMgII ?=-1 MgII redshift
143 I1 --- Morph [0/1] Morphology flag (0=point, 1=extended)
145- 158 I14 --- Btarg1 ?=0 Main (BOSS) survey primary target
selection flags (G4)
160- 178 I19 --- Atarg1 ?=0 Ancillary target selection flag 1 (G4)
180- 182 I3 --- Atarg2 ?=0 Ancillary target selection flag 2 (G4)
184 I1 --- f7 [0/1] 1=quasar in SDSS-DR7 (Cat. VII/260)
186- 189 I4 --- Plate7 ?=-1 SDSS DR7 Plate number
191- 195 I5 --- MJD7 ?=-1 SDSS DR7 spectroscopic MJD
197- 199 I3 --- Fiber7 ?=-1 SDSS DR7 Fiber number
201- 202 I2 --- US [0/2]?=-1 Uniform sample flag (G6)
205- 214 F10.4 mag iMAG ?=-9999. Absolute Magnitude Mi[z=2] (G5)
217- 226 F10.4 mag D(g-i) ?=-9999. Diff. color Δ(g-i) (G7)
228- 235 F8.4 --- alpha ?=500 Spectral index αν
237- 243 F7.4 --- SNRsp Median S/N ratio (whole spectrum)
245- 251 F7.4 --- SNR1700 ?=-1 Median SNR (1650-175nm rest)
253- 259 F7.4 --- SNR3000 ?=-1 Median SNR (2950-305nm rest)
261- 267 F7.4 --- SNR5150 ?=-1 Median SNR (5100-525nm rest)
269- 277 F9.4 km/s FW(CIV) ?=-1 FWHM of CIV emission
279- 287 F9.4 km/s HW(CIV)b ?=-1 Blue HWHM of CIV emission
289- 297 F9.4 km/s HW(CIV)r ?=-1 Red HWHM of CIV emission
299- 306 F8.4 --- A(CIV) ?=-1 Amplitude of CIV emission (G8)
308- 315 F8.4 0.1nm W(CIV) ?=-1 Rest equivalent width of CIV emission
317- 324 F8.4 0.1nm e_W(CIV) ?=-1 Error on rest EW of CIV emission
326- 335 F10.4 km/s FW(CIII) ?=-1 FWHM of CIII] complex
337- 346 F10.4 km/s HW(CIII)b ?=-1 Blue HWHM of CIII] complex
348- 357 F10.4 km/s HW(CIII)r ?=-1 Red HWHM of CIII] complex
359- 365 F7.4 --- A(CIII) ?=-1 Amplitude of CIII] complex (G8)
367- 376 F10.4 0.1nm W(CIII) ?=-1 Rest equivalent width of CIII] complex
378- 386 F9.4 0.1nm e_W(CIII) ?=-1 Error on rest EW of CIII] complex
388- 396 F9.4 km/s FW(MgII) ?=-1 FWHM of MgII emission
398- 406 F9.4 km/s HW(MgII)b ?=-1 Blue HWHM of MgII emission
408- 416 F9.4 km/s HW(MgII)r ?=-1 Red HWHM of MgII emission
418- 424 F7.4 --- A(MgII) ?=-1 Amplitude of MgII emission (G8)
426- 433 F8.4 0.1nm W(MgII) ?=-1 Rest equivalent width of MgII emission
435- 442 F8.4 0.1nm e_W(MgII) ?=-1 Error on rest EW of MgII emission
444 I1 --- BAL [0/1] BAL flag from visual inspection
446- 455 F10.4 km/s BI(CIVt) ?=-1 Balnicity index (BI) of CIV trough
457- 466 F10.4 km/s e_BI(CIVt) ?=-1 Error on BI of CIV trough
468- 477 F10.4 km/s AI(CIVt) ?=-1 Absorption Index of CIV trough
479- 487 F9.4 km/s e_AI(CIVt) ?=-1 Error on AI of CIV trough
489- 498 F10.4 km/s DI(CIVt) ?=-1 Detection index (DI) of CIV trough
500- 509 F10.4 km/s e_DI(CIVt) ?=-1 Error on the DI of CIV trough
511- 524 F14.4 km/s Chi2CIVt ? Chi2 of the CIV troughs
526 I1 --- N2t [0/5] Number of CIV troughs > 1999km/s
528- 538 F11.4 km/s Vmin2t ?=0 Min velocity of CIV troughs (NCIV2)
540- 550 F11.4 km/s Vmax2t ?=0 Max velocity of CIV troughs (NCIV2)
552- 553 I2 --- N.45t [0/13] Number of CIV troughs > 449km/s
555- 565 F11.4 km/s Vmin.45t ? Min velocity of CIV troughs (NCIV4.5)
567- 577 F11.4 km/s Vmax.45t ? Max velocity of CIV troughs (NCIV4.5)
579- 585 F7.4 0.1nm W(SiIVt) ?=0 Rest equivalent width of SiIV trough
587- 593 F7.4 0.1nm W(CIVt) ?=0 Rest equivalent width of CIV trough
595- 601 F7.4 0.1nm W(AlIIIt) ?=0 Rest equivalent width of AlIII trough
603- 606 I4 --- Run Imaging Run Number
608- 612 I5 d Ph-MJD Photometric MJD
614- 616 I3 --- Rerun Photometric Processing Rerun number
618 I1 --- Colcam [1/6] camera column number
620- 622 I3 --- Field Field number
624- 642 I19 --- objID ?=-9999. Object Identification number
644- 653 F10.4 3.63uJy Fu ?=-9999. u-band flux (in nanomaggies) (G1)
655- 664 F10.4 3.63uJy e_Fu ?=-9999. Error on Fu (in nanomaggies) (G1)
666- 675 F10.4 3.63uJy Fg ?=-9999. g-band flux (in nanomaggies) (G1)
677- 686 F10.4 3.63uJy e_Fg ?=-9999. Error on Fg (in nanomaggies) (G1)
688- 697 F10.4 3.63uJy Fr ?=-9999. r-band flux (in nanomaggies) (G1)
699- 708 F10.4 3.63uJy e_Fr ?=-9999. Error on Fr (in nanomaggies) (G1)
710- 719 F10.4 3.63uJy Fi ?=-9999. i-band flux (in nanomaggies) (G1)
721- 730 F10.4 3.63uJy e_Fi ?=-9999. Error on Fi (in nanomaggies) (G1)
732- 741 F10.4 3.63uJy Fz ?=-9999. z-band flux (in nanomaggies) (G1)
743- 752 F10.4 3.63uJy e_Fz ?=-9999. Error on Fz (in nanomaggies) (G1)
754- 763 F10.4 3.63uJy Fut ?=-9999 TARGET flux in the u-band
(in nanomaggies) (G1)
765- 774 F10.4 3.63uJy Fgt ?=-9999 TARGET flux in the g-band
(in nanomaggies) (G1)
776- 785 F10.4 3.63uJy Frt ?=-9999 TARGET flux in the r-band
(in nanomaggies) (G1)
787- 796 F10.4 3.63uJy Fit ?=-9999 TARGET flux in the i-band
(in nanomaggies) (G1)
798- 807 F10.4 3.63uJy Fzt ?=-9999 TARGET flux in the z-band
(in nanomaggies) (G1)
809- 815 F7.4 mag Extu u-band Galactic extinction
817- 823 F7.4 [cm-2] logNHI ?=-9 log of Galactic HI column density
825- 831 F7.4 [ct/s] logXcr ?=-9 log RASS full band count rate
833- 839 F7.4 --- SNR(X) ?=-9 SNR of RASS count rate
841 I1 arcsec sepX [0] SDSS-RASS separation
843- 850 F8.4 3.63uJy FNUV NUV flux (GALEX) (in nanomaggies) (G1)
852- 861 F10.4 3.63uJy e_FNUV ?=0 Error on NUV flux (in nanomaggies)(G1)
863- 869 F7.4 3.63uJy FFUV FUV flux (GALEX) (in nanomaggies) (G1)
871- 880 F10.4 3.63uJy e_FFUV ?=0 Error on FUV flux (in nanomaggies)(G1)
882- 888 F7.4 mag Jmag ?=0 2MASS J-band magnitude (Vega)
890- 896 F7.4 mag e_Jmag ?=-1 Error on J-band magnitude
898- 904 F7.4 --- SNR(J) ?=-1 J-band SNR
906 I1 --- f_Jmag [0/6]? J-band photometry flag
908- 914 F7.4 mag Hmag ?=0 2MASS H-band magnitude (Vega)
916- 922 F7.4 mag e_Hmag ?=-1 Error on H-band magnitude
924- 930 F7.4 --- SNR(H) ?=-1 H-band SNR
932 I1 --- f_Hmag [0/6]? H-band photometry flag
934- 942 F9.6 mag Kmag ?=0 2MASS Ks-band magnitude (Vega)
944- 952 F9.6 mag e_Kmag ?=-1 Error on K-band magnitude
954- 962 F9.6 --- SNR(K) ?=-1 K-band SNR
964 I1 --- f_Kmag [0/6]? K-band photometry flag
966- 974 F9.6 arcsec sep2 ?=0 SDSS-2MASS separation
976- 984 F9.6 mag W1mag ?=0 WISE W1 magnitude (Vega, Cat. II/311)
986- 994 F9.6 mag e_W1mag ?=0 Error on W1 magnitude
996-1004 F9.6 --- W1SNR ?=0 SNR in W1 band
1006-1014 F9.6 --- W1chi2 ?=0 Chi2 in W1 band
1016-1024 F9.6 mag W2mag ?=0 WISE W2 magnitude (Vega, Cat. II/311)
1026-1034 F9.6 mag e_W2mag ?=0 Error on W2 magnitude
1036-1044 F9.6 --- W2SNR ?=0 SNR in W2 band
1046-1054 F9.6 --- W2chi2 ?=0 Chi2 in W2 band
1056-1064 F9.6 mag W3mag ?=0 WISE W3 magnitude (Vega, Cat. II/311)
1066-1073 F8.6 mag e_W3mag ?=0 Error on W3 magnitude
1075-1083 F9.6 --- W3SNR ?=0 SNR in W3 band
1085-1093 F9.6 --- W3chi2 ?=0 Chi2 in W3 band
1095-1102 F8.6 mag W4mag ?=0 WISE W4 magnitude (Vega, Cat. II/311)
1104-1111 F8.6 mag e_W4mag ?=0 Error on W4 magnitude
1113-1121 F9.6 --- W4SNR ?=0 SNR in W4 band
1123-1132 F10.6 --- W4chi2 ?=0 Chi2 in W4 band
1134-1141 F8.6 arcsec sepW ?=0 SDSS-WISE separation
1143-1153 F11.6 mJy F1p ?=0 FIRST (Cat. VIII/90) peak flux
density at 20cm
1155-1165 F11.6 --- SNR(1) ?=0 SNR of the FIRST flux density
1167-1174 F8.6 arcsec sep1 ?=0 SDSS-FIRST separation
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Byte-by-byte Description of file: dr9qsup.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- SDSS SDSS-DR9 designation (HHMMSS.ss+DDMMSS.s) (1)
20- 29 F10.6 deg RAdeg ? Right ascension (J2000.0) (1)
31- 39 F9.6 deg DEdeg ? Declination (J2000.0) (1)
41- 49 I9 --- THINGID ?=-1 Unique identifier (1)
51- 54 I4 --- Plate SDSS Plate number
56- 60 I5 --- MJD SDSS Spectroscopic MJD
62- 65 I4 --- Fiber SDSS Fiber number
67- 72 F6.4 --- z.v Visual inspection redshift
74- 80 F7.4 --- z.b BOSS pipeline redshift
82- 89 F8.4 --- e_z.b ?=-1 Error on pipeline redshift
91- 93 I3 --- f_z.b [0/134] zwarning flag (G2)
95-101 F7.4 --- z.p ?=-1 PCA redshift (G3)
103-109 F7.4 --- e_z.p ?=-1 Error on PCA redshift (G3)
111-117 F7.4 --- qCont ?=-1 Quality of PCA continuum (G3)
119-125 F7.4 --- zCIV ?=-1 CIV redshift
127-133 F7.4 --- zCIII ?=-1 CIII] complex redshift
135-141 F7.4 --- zMgII ?=-1 MgII redshift
143 I1 --- Morph [0/1] Morphology flag (0=point, 1=extended)
145-158 I14 --- Btarg1 ?=1 Main (BOSS) survey primary target
selection flags (G4)
160-178 I19 --- Atarg1 ?=1 Ancillary target selection flag 1 (G4)
180-182 I3 --- Atarg2 ?=1 Ancillary target selection flag 2 (G4)
184-191 F8.4 --- alpha ?=500 Spectral index αν
193-199 F7.4 --- SNRsp Median SNR (whole spectrum)
201-207 F7.4 --- SNR1700 ?=-1 Median SNR (1650-175nm rest)
209-215 F7.4 --- SNR3000 ?=-1 Median SNR (2950-305nm rest)
217-223 F7.4 --- SNR5150 ?=-1 Median SNR (5100-525nm rest)
225-233 F9.4 km/s FW(CIV) ?=-1 FWHM of CIV emission
235-243 F9.4 km/s HW(CIV)b ?=-1 Blue HWHM of CIV emission
245-253 F9.4 km/s HW(CIV)r ?=-1 Red HWHM of CIV emission
255-262 F8.4 --- A(CIV) ?=-1 Amplitude of CIV emission (G8)
264-271 F8.4 0.1nm W(CIV) ?=-1 Rest equivalent width of CIV emission
273-280 F8.4 0.1nm e_W(CIV) ?=-1 Error on rest EW of CIV emission
282-291 F10.4 km/s FW(CIII) ?=-1 FWHM of CIII] complex
293-302 F10.4 km/s HW(CIII)b ?=-1 Blue HWHM of CIII] complex
304-313 F10.4 km/s HW(CIII)r ?=-1 Red HWHM of CIII] complex
315-321 F7.4 --- A(CIII) ?=-1 Amplitude of CIII] complex (G8)
323-332 F10.4 0.1nm W(CIII) ?=-1 Rest equivalent width of CIII] complex
334-342 F9.4 0.1nm e_W(CIII) ?=-1 Error on rest EW of CIII] complex
344-352 F9.4 km/s FW(MGII) ?=-1 FWHM of MgII emission
354-362 F9.4 km/s HW(MGII)b ?=-1 Blue HWHM of MgII emission
364-372 F9.4 km/s HW(MGII)r ?=-1 Red HWHM of MgII emission
374-380 F7.4 --- A(MGII) ?=-1 Amplitude of MgII emission (G8)
382-389 F8.4 0.1nm W(MGII) ?=-1 Rest equivalent width of MgII emission
391-398 F8.4 0.1nm e_W(MGII) ?=-1 Error on rest EW of MgII emission
400 I1 --- BAL [0/1] BAL flag from visual inspection
402-411 F10.4 km/s BI(CIVt) ?=-1 Balnicity index (BI) of CIV trough
413-423 F11.4 km/s e_BI(CIVt) ?=-1 Error on BI of CIV trough
425-431 F7.1 km/s AI(CIVt) ?=-1 Absorption Index of CIV trough
433-439 F7.1 km/s e_AI(CIVt) ?=-1 Error on AI of CIV trough
441-447 F7.1 km/s DI(CIVt) ?=-1 Detection index (DI) of CIV trough
449-455 F7.1 km/s e_DI(CIVt) ?=-1 Error on the DI of CIV trough
457-463 F7.4 km/s Chi2CIVt ?=-1 Chi2 of the CIV troughs
465-466 I2 --- N2t ?=-1 Number of CIV troughs > 1999km/s
468-478 F11.4 km/s Vmin2t ?=0 Min velocity of CIV troughs (NCIV2)
480-490 F11.4 km/s Vmax2t ?=0 Max velocity of CIV troughs (NCIV2)
492-493 I2 --- N.45t ?=-1 Number of CIV troughs > 449km/s
495-505 F11.4 km/s Vmin.45t ? Min velocity of CIV troughs (NCIV4.5)
507-517 F11.4 km/s Vmax.45t ? Max velocity of CIV troughs (NCIV4.5)
519-522 I4 --- Run ?=0 Imaging Run Number
524-528 I5 --- Ph-MJD ?=0 Photometric MJD
530-532 I3 --- Rerun ? Photometric Processing Rerun number
534 I1 --- Colcam ?=0 camera column number
536-538 I3 --- Field ?=0 Field number
540-558 I19 --- objID ? Object Identification number
560-568 F9.4 3.63uJy Fu ?=-999. u-band flux (in nanomaggies) (G1)
570-576 F7.4 3.63uJy e_Fu ?=-9. Error on Fu (in nanomaggies) (G1)
578-586 F9.4 3.63uJy Fg ?=-999. g-band flux (in nanomaggies) (G1)
588-594 F7.4 3.63uJy e_Fg ?=-9. Error on Fg (in nanomaggies) (G1)
596-604 F9.4 3.63uJy Fr ?=-999. r-band flux (in nanomaggies) (G1)
606-612 F7.4 3.63uJy e_Fr ?=-9. Error on Fr (in nanomaggies) (G1)
614-622 F9.4 3.63uJy Fi ?=-999. i-band flux (in nanomaggies) (G1)
624-630 F7.4 3.63uJy e_Fi ?=-9. Error on Fi (in nanomaggies) (G1)
632-640 F9.4 3.63uJy Fz ?=-999. z-band flux (in nanomaggies) (G1)
642-648 F7.4 3.63uJy e_Fz ?=-9. Error on Fz (in nanomaggies) (G1)
650-656 F7.4 mag Extu u-band Galactic extinction
--------------------------------------------------------------------------------
Note (1): The first 74 objects have no SDSS name, and no position.
--------------------------------------------------------------------------------
Global notes:
Note (G1): In SDSS-III, we express all fluxes in terms of "nanomaggies",
which are a convenient linear unit. These quantities are related to
standard AB magnitudes: an object with flux F given in nMgy has a
Pogson magnitude (on AB scale) m=[22.5mag]-2.5log10F. A flux of 1Mgy
is therefore close to 3631Jy, and 1nMgy≃3.631µJy.
Note (G2): the "zwarning" flag is made of the following bits:
1 [0] = sky fiber
2 [1] = too little wavelength coverage
4 [2] = chi-squared of best fit is too close to that of second best
8 [3] = synthetic spectrum is negative
16 [4] = fraction of points more than 5σ away from best model
is too large (>5%)
32 [5] = chi-squared minimum at edge of the redshift fitting range
64 [6] = a QSO line exhibits negative emission (triggered only in QSO
spectra if CIV, CIII, MgII, Hβ, or Hα has
lineArea+3σ(lineArea)<0)
128 [7] = the fiber was unplugged, so no spectrum obtained
Note (G3): Principal Component Analysis of quasar spectra, see
Paris et al. 2011, Cat. J/A+A/530/A50; the quality is defined
by Eq.(11) in Paris et al. (2011A&A...530A..50P 2011A&A...530A..50P)
Note (G4): See Dawson et al. 2013AJ....145...10D 2013AJ....145...10D for the description
of the target selection flags. See also:
* http://www.sdss3.org/dr9/algorithms/bitmask_boss_target1.php
for the BOSS survey primary target selection flags
* http://www.sdss3.org/dr9/algorithms/bitmask_ancillary_target1.php
for the ancillary target 1 flags (BOSS Ancillary Targets)
* http://www.sdss3.org/dr9/algorithms/bitmask_ancillary_target2.php
for the ancillary target 2 flags (more BOSS Ancillary Targets)
Note (G5): Absolute magnitude calculated after correction for Galactic
extinction; the cosmology is defined by H0=70km/s/Mpc,
ΩM=0.3, ΩΛ=0.7; and the continuum spectral
index is -0.5.
Note (G6): quasars selected by XDQSO (eXtreme Deconvolution method):
a positive "uniform" flag indicates QSOs in a sufficiently
statistical sample for, e.g., clustering measurements.
1 indicates a core target, and 2 a quite complete core.
Note (G7): Δ(g-i) is the difference in (g-i), Galactic extinction
corrected, between the quasar and the mean of the quasars at that
redshift. Δ(g-i) is not defined for quasars at either z<0.12
or z>5.12. See Sect. 7 for details about this quantity.
Note (G8): Amplitude of the emission line, in units of the median rms
pixel noise,
--------------------------------------------------------------------------------
Acknowledgements:
Isabelle Paris, paris(at)iap.fr
History:
22-Nov-2012: Insert into VizieR
10-Feb-2016: Correction of 156 SDSS identifiers in dr9q.dat
(End) Isabelle Paris [UChile, Chile], Patricia Vannier [CDS] 19-Oct-2012