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V/147          The SDSS Photometric Catalogue, Release 12          (Alam+, 2015)

The SDSS Photometric Catalogue, Data Release 12 (DR12) Alam S. et al. <Astrophys. J. Suppl. Ser. 219, 12 (2015)> =2015ApJS..219...12A =2016yCat.5147....0A
ADC_Keywords: Surveys; Photometry, SDSS ; Redshifts Keywords: atlases - catalogs - surveys Abstract: The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using the original SDSS wide-field imager, the original and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resolution spectrograph, and a novel optical interferometer. All of the data from SDSS-III are now made public. In particular, Alam+, 2015ApJS..219...12A paper describes Data Release 11 (DR11) including all data acquired through 2013 July, and DR12 adding data acquired through 2014 July (including all data included in previous data releases), marking the end of SDSS-III observing. Relative to our previous public release (DR10), DR12 adds one million new spectra of galaxies and quasars from the Baryon Oscillation Spectroscopic Survey (BOSS) over an additional 3000deg2 of sky, more than triples the number of H-band spectra of stars as part of the Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE), and includes repeated accurate radial velocity measurements of 5500 stars from the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS). The APOGEE outputs now include the measured abundances of 15 different elements for each star. In total, SDSS-III added 5200deg2 of ugriz imaging. Since its first light in 1998, SDSS has imaged over 1/3 of the Celestial sphere in five bands and obtained over five million astronomical spectra. Description: Data Release 12 (DR12) is the final data release of the SDSS-III, containing all SDSS observations through July 2014. It includes the complete dataset of the BOSS and APOGEE surveys, and also newly includes stellar radial velocity measurements from MARVELS. The principal changes from previous versions are summarized at http://www.sdss.org/dr12/whatsnew/ Official SDSS-III Acknowledgement: We request that the following be added to the acknowledgement section of any paper using data from the SDSS-III. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, University of Florida, the French Participation Group, the German Participation Group, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sdss12.sam 1168 1000 *Sample output of the SDSS photometric catalog
Note on sdss12.sam: a sample close to the point (0,0) is given in "sdss12.sam". The catalog described here is a subset of the full SDSS catalog available from http://www.sdss3.org/dr12/ restricted to primary and secondary photo objects, and with a selection of the columns of the full catalog. Column names (labels) frequently differ from their original names, in which case the original name is added to the description of the original column.
See also: http://www.sdss.org/dr12/ : SDSS DR12 home page http://www.sdss.org/dr12/help/glossary/ : Glossary of SDSS Terminology V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) Byte-by-byte Description of file: sdss12.sam
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right Ascension of the object (ICRS) (ra) 12- 21 F10.6 deg DEdeg Declination of the object (ICRS) (dec) 23 I1 --- mode [1/2] 1: primary (469,053,874 sources), 2: secondary (324,960,094 sources) 25 A1 --- q_mode [+] '+' indicates clean photometry (310,190,812 sources with mode 1+) (clean) 27 I1 --- class Type of object (3=galaxy, 6=star) (1) 29- 47 A19 --- SDSS12 SDSS-DR12 name, based on J2000 position 49 A1 --- m_SDSS12 [*] The asterisk indicates that 2 different SDSS objects share the same SDSS12 name 51- 70 A20 --- SDSS-ID [0-9 -] SDSS object identifier (2) 72- 90 I19 --- objID SDSS unique object identifier (2) 92-106 A15 --- Sp-ID ? Spectroscopic Plate-MJD-Fiber identifier (7) 108-126 I19 --- SpObjID Pointer to the spectrum of object, or 0 (7) 128-146 I19 --- parentID Pointer to parent (if object deblended) 148-166 I19 --- flags Photo Object Attribute flags (3) 168-171 I4 --- Status Hexadecimal status (4) 173-177 F5.3 arcsec e_RAdeg [0/51703] Mean error on RAdeg (raErr) 179-183 F5.3 arcsec e_DEdeg [0/20301] Mean error on DEdeg (decErr) 185-193 F9.4 yr ObsDate Mean Observation date (6) 195 I1 --- Q [1/3] Quality of the observation: 1=bad 2=acceptable 3=good 197-202 F6.3 mag umag [4/38]? Model magnitude in u filter, AB scale (u) (5) 204-208 F5.3 mag e_umag ? Mean error on umag (err_u) 210-215 F6.3 mag gmag [5/40]? Model magnitude in g filter, AB scale (g) (5) 217-221 F5.3 mag e_gmag ? Mean error on gmag (err_g) 223-228 F6.3 mag rmag [4/39]? Model magnitude in r filter, AB scale (r) (5) 230-234 F5.3 mag e_rmag ? Mean error on rmag (err_r) 236-241 F6.3 mag imag [3/40]? Model magnitude in i filter, AB scale (i) (5) 243-247 F5.3 mag e_imag ? Mean error on imag (err_i) 249-254 F6.3 mag zmag [3/38]? Model magnitude in z filter, AB scale (z) (5) 256-260 F5.3 mag e_zmag ? Mean error on zmag (err_z) -------------------------------------------------------------------------------- 262-269 F8.5 --- zsp [-0.02/7.1]?=-9999 Spectroscopic redshift (when SpObjID>0) (7) 271-277 F7.5 --- e_zsp ?=-9999 Mean error on zsp (negative for bad fit) (7) 279-281 I3 --- f_zsp [0/196]? "zwarning" flag (9) 283-292 F10.6 km/s Vdisp [0/850]? Velocity dispersion (velDisp) 294-299 F6.3 km/s e_Vdisp ? Mean error on Vdisp (velDispErr) 301-304 A4 --- spInst ? Spectral instrument used (SDSS or BOSS) (instrument) 306-324 A19 --- spType ? Source type (sourceType) (10) 326-331 A6 --- spCl ? Spectroscopic class: GALAXY, QSO, STAR 333-353 A21 --- subCl ? Spectroscopic subclass (subClass) (11) 355-360 F6.2 --- spS/N [0/132]? Median signal-to-noise over all good pixels (snMedian) -------------------------------------------------------------------------------- 362-380 I19 --- uFlags Detection flags, u band (flags_u) (3) 382 I1 --- us 0=notStar, 1=Star in u band (probPSF_u) 384 I1 --- uc [0/6] Phototype in u band, 6=Star (type_u) (1) 386-394 F9.4 yr uDate Date of observation in u band (6) 396-401 F6.3 mag u'mag [4/38]? Model magnitude in u' filter (= umag) (5) 403-408 F6.3 mag e_u'mag ? Mean error on u'mag (= e_umag) 410-415 F6.3 mag upmag [5/34]? PSF magnitude in u band (psfMag_u) 417-422 F6.3 mag e_upmag ? Mean error on upmag (psfMagErr_u) 424-429 F6.3 mag uPmag [3/43]? Petrosian magnitude in u band (petroMag_u) 431-436 F6.3 mag e_uPmag ? Mean error on uPmag (petroMagErr_u) 438-444 F7.3 arcsec uPrad [0/260]? Petrosian radius in u band (petroRad_u) 446-454 F9.3 arcsec e_uPrad ?=-1000 Mean error in uPrad (petroRadErr_u) 456-461 F6.2 arcsec uoRA ? Offset of u position along RA (offsetRa_u) 463-468 F6.2 arcsec uoDE ? Offset of u position along Dec (offsetDec_u) 470-476 F7.3 arcsec udVrad ? de Vaucouleurs fit radius, u band (deVRad_u) 478-484 F7.3 arcsec udVell ? de Vaucouleurs fit ellipt, u band (1-deVAB_u) 486-490 F5.1 deg uPA ? Position angle of dVrad in u band (deVPhi_u) -------------------------------------------------------------------------------- 492-510 I19 --- gFlags Detection flags, g band (flags_g) (3) 512 I1 --- gs 0=notStar, 1=Star in g band (probPSF_g) 514 I1 --- gc Phototype in g band, 6=Star (type_g) (1) 516-524 F9.4 yr gDate Date of observation in g band (6) 526-531 F6.3 mag g'mag [5/39]? Model magnitude in g' filter (= gmag) (5) 533-538 F6.3 mag e_g'mag ? Mean error on g'mag (= e_gmag) 540-545 F6.3 mag gpmag [5/37]? PSF magnitude in g band (psfMag_g) 547-552 F6.3 mag e_gpmag ? Mean error on gpmag (psfMagErr_g) 554-559 F6.3 mag gPmag [4/46]? Petrosian magnitude in g band (petroMag_g) 561-566 F6.3 mag e_gPmag ? Mean error on gPmag (petroMagErr_g) 568-574 F7.3 arcsec gPrad ? Petrosian radius in g band (petroRad_g) 576-584 F9.3 arcsec e_gPrad ?=-1000 Mean error in gPrad (petroRadErr_g) 586-591 F6.2 arcsec goRA ? Offset of g position along RA (offsetRa_g) 593-598 F6.2 arcsec goDE ? Offset of g position along Dec (offsetDec_g) 600-606 F7.3 arcsec gdVrad ? de Vaucouleurs fit radius, g band (deVRad_g) 608-614 F7.3 arcsec gdVell ? de Vaucouleurs fit ellipt, g band (1-deVAB_g) 616-620 F5.1 deg gPA ? Position angle of dVrad in g band (deVPhi_g) -------------------------------------------------------------------------------- 622-640 I19 --- rFlags Detection flags, r band (flags_r) (3) 642 I1 --- rs 0=notStar, 1=Star in r band (probPSF_r) 644 I1 --- rc Phototype in r band, 6=Star (type_r) (1) 646-654 F9.4 yr rDate Date of observation in r band (6) 656-661 F6.3 mag r'mag [4/39]? Model magnitude in r' filter (= rmag) (5) 663-668 F6.3 mag e_r'mag ? Mean error on r'mag (= e_rmag) 670-675 F6.3 mag rpmag [4/33]? PSF magnitude in r band (psfMag_r) 677-682 F6.3 mag e_rpmag ? Mean error on rpmag (psfMagErr_r) 684-689 F6.3 mag rPmag [4/43]? Petrosian magnitude in r band (petroMag_r) 691-696 F6.3 mag e_rPmag ? Mean error on rPmag (petroMagErr_r) 698-704 F7.3 arcsec rPrad ? Petrosian radius in r band (petroRad_r) 706-714 F9.3 arcsec e_rPrad ?=-1000 Mean error in rPrad (petroRadErr_r) 716-721 F6.2 arcsec roRA ? Offset of r position along RA (offsetRa_r) 723-728 F6.2 arcsec roDE ? Offset of r position along Dec (offsetDec_r) 730-736 F7.3 arcsec rdVrad ? de Vaucouleurs fit radius, r band (deVRad_r) 738-744 F7.3 arcsec rdVell ? de Vaucouleurs fit ellipt, r band (1-deVAB_r) 746-750 F5.1 deg rPA ? Position angle of dVrad in r band (deVPhi_r) -------------------------------------------------------------------------------- 752-770 I19 --- iFlags Detection flags, i band (flags_i) (3) 772 I1 --- is 0=notStar, 1=Star in i band (probPSF_i) 774 I1 --- ic Phototype in i band, 6=Star (type_i) (1) 776-784 F9.4 yr iDate Date of observation in i band (6) 786-791 F6.3 mag i'mag [3/40]? Model magnitude in i' filter (= imag) (5) 793-798 F6.3 mag e_i'mag ? Mean error on i'mag (= e_imag) 800-805 F6.3 mag ipmag [3/34]? PSF magnitude in i band (psfMag_i) 807-812 F6.3 mag e_ipmag ? Mean error on ipmag (psfMagErr_i) 814-819 F6.3 mag iPmag [3/45]? Petrosian magnitude in i band (petroMag_i) 821-826 F6.3 mag e_iPmag ? Mean error on iPmag (petroMagErr_i) 828-834 F7.3 arcsec iPrad ? Petrosian radius in i band (petroRad_i) 836-844 F9.3 arcsec e_iPrad ?=-1000 Mean error in iPrad (petroRadErr_i) 846-851 F6.2 arcsec ioRA ? Offset of i position along RA (offsetRa_i) 853-858 F6.2 arcsec ioDE ? Offset of i position along Dec (offsetDec_i) 860-866 F7.3 arcsec idVrad ? de Vaucouleurs fit radius, i band (deVRad_i) 868-874 F7.3 arcsec idVell ? de Vaucouleurs fit ellipt, i band (1-deVAB_i) 876-880 F5.1 deg iPA ? Position angle of dVrad in i band (deVPhi_i) -------------------------------------------------------------------------------- 882-900 I19 --- zFlags Detection flags, z band (flags_z) (3) 902 I1 --- zs 0=notStar, 1=Star in z band (probPSF_z) 904 I1 --- zc Phototype in z band, 6=Star (type_z) (1) 906-914 F9.4 yr zDate Date of observation in z band (6) 916-921 F6.3 mag z'mag [3/38]? Model magnitude in z filter (= zmag) (5) 923-928 F6.3 mag e_z'mag ? Mean error on z'mag (= e_zmag) 930-935 F6.3 mag zpmag [3/32]? PSF magnitude in z band (psfMag_z) 937-942 F6.3 mag e_zpmag ? Mean error on zpmag (psfMagErr_z) 944-949 F6.3 mag zPmag [3/42]? Petrosian magnitude in z band (petroMag_z) 951-956 F6.3 mag e_zPmag ? Mean error on zPmag (petroMagErr_z) 958-964 F7.3 arcsec zPrad ? Petrosian radius in z band (petroRad_z) 966-974 F9.3 arcsec e_zPrad ?=-1000 Mean error in zPrad (petroRadErr_z) 976-981 F6.2 arcsec zoRA ? Offset of z position along RA (offsetRa_z) 983-988 F6.2 arcsec zoDE ? Offset of z position along Dec (offsetDec_z) 990-996 F7.3 arcsec zdVrad ? de Vaucouleurs fit radius, z band (deVRad_z) 998-1004 F7.3 arcsec zdVell ? de Vaucouleurs fit ellipt, z band (1-deVAB_z) 1006-1010 F5.1 deg zPA ? Position angle of dVrad in z band (deVPhi_z) -------------------------------------------------------------------------------- 1012-1018 F7.1 mas/yr pmRA [-6121/4129]? Proper motion along Right Ascension (pmRa) (8) 1020-1025 F6.1 mas/yr e_pmRA ? Mean error on pmRA (pmRaErr) (8) 1027-1033 F7.1 mas/yr pmDE [-4846/4437]? Proper motion along Declination (pmDec) (8) 1035-1040 F6.1 mas/yr e_pmDE ? Mean error on pmDE (pmDecErr) (8) 1042-1048 F7.2 mas sigRA [0/8662]? RMS residual of proper motion fit in RA (8) 1050-1055 F6.2 mas sigDE [0/10625]? RMS residual of proper motion fit in Dec (8) 1057-1058 I2 --- M [1/4]?=-1 Number of USNO-B objects matched within 1arcsec (match) (8) 1060-1061 I2 --- N [4/6]?=-1 Number of detections used in the pm fit, including SDSS (nFit) (8) 1063-1066 F4.1 --- g(O) ? Magnitude from O plate recalibrated to g (8) 1068-1071 F4.1 --- r(E) ? Magnitude from E plate recalibrated to r (8) 1073-1076 F4.1 --- g(J) ? Magnitude from J plate recalibrated to g (8) 1078-1081 F4.1 --- r(F) ? Magnitude from F plate recalibrated to r (8) 1083-1086 F4.1 --- i(N) ? Magnitude from N plate recalibrated to i (8) 1088-1097 F10.4 --- zph [-9999/]? Photometric redshift; estimated by robust fit to nearest neighbors in a reference set (12) 1099-1108 F10.4 --- e_zph [-9999/]? Estimated error of the photometric redshift (zErr) (12) 1110-1115 F6.4 --- <zph> [0.009/0.9]? average redshift of the nearest neighbors; if significantly different from zph this might be a better estimate than zph (nnAvgZ) 1117-1123 F7.3 --- chi2 ? Chi-square value for the minimum chi-square template fit (chisq_zph) 1125-1132 F8.3 mag u'Mag [-644/4]? rest frame u' absolute magnitude (absMagU) 1134-1141 F8.3 mag g'Mag [-472/3]? rest frame g' absolute magnitude (absMagG) 1143-1150 F8.3 mag r'Mag [-351/3]? rest frame r' absolute magnitude (absMagR) 1152-1159 F8.3 mag i'Mag [-271/7]? rest frame i' absolute magnitude (absMagI) 1161-1168 F8.3 mag z'Mag [-199/3]? rest frame z' absolute magnitude (absMagZ)
Note (1): The type (class) is numbered as follows: 0 = Unknown: Object type is not known. 1 = Cosmic-ray track (not used). 2 = Defect (not used) 3 = Galaxy: An extended object composed of many stars and other matter (208,478,448 with mode=1 occurrences) 4 = Ghost: Object created by reflected or refracted light. (not used) 5 = KnownObject: Object came from some other catalog (not yet used) 6 = Star: A a self-luminous gaseous celestial body (260,562,744 with mode=1 occurrences) 7 = Trail: A satellite or asteroid or meteor trail. (not yet used) 8 = Sky: Blank sky spectrogram (no objects in this arcsecond area). 9 = NotAType (not used) Note (2): The SDSS identifier is composed of the 5 numbers run, rerun (301), camcol (1-6), field (11-1001) and object (1-16000). The SDSS-ID is written run-rerun-cam-field-obj (5 numbers and 4 dashes). The objID is also combined from these numbers (the ≪n operator represents the left shift of n bits, i.e. a multiplication by 2^n): objID = skyVersion≪59 + rerun≪48 + run≪32 + camcol≪29 + field≪16 + obj (in the case of DR8-9, skyVersion=2 and rerun=301, i.e. objID is in the range 1237645472596754432-1237926947573465087 (hexa 112d000000000000-112dffffffffffff). Note (3): flags written in hexadecimal, full description available at http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#&&history=search+PhotoFlags ------------------------------------------------------------------------------ 0000000000000001 = CANONICAL_CENTER Measurements used the center in r* 0000000000000002 = BRIGHT Object detected in bright object-finding 0000000000000004 = EDGE Object is too close to edge of frame 0000000000000008 = BLENDED Multiple peaks detected 0000000000000010 = CHILD Product of deblending a BLENDED object. 0000000000000020 = PEAKCENTER Position of peak pixel rather than ML 0000000000000040 = NODEBLEND No deblending attempted on BLENDED object 0000000000000080 = NOPROFILE Radial profile could not be estimated 0000000000000100 = NOPETRO No valid Petrosian radius found 0000000000000200 = MANYPETRO More than one Petrosian radius found. 0000000000000400 = NOPETRO_BIG Petrosian radius beyond radial profile. 0000000000000800 = DEBLENDTOOMANY_PEAKS More than 25 peaks in this object 0000000000001000 = COSMIC_RAY Contains a pixel part of a cosmic ray. 0000000000002000 = MANYR50 More than one 50% light radius. 0000000000004000 = MANYR90 More than one 90% light radius. 0000000000008000 = BAD_RADIAL Some points in radial profile S/N<0 0000000000010000 = INCOMPLETE_PROFILE Petrosian radius intersects frame edge 0000000000020000 = INTERP Pixel(s) determined by interpolation. 0000000000040000 = SATURATED Saturated pixel(s) 0000000000080000 = NOTCHECKED Not checked for local peaks 0000000000100000 = SUBTRACTED BRIGHT object, wings subtracted 0000000000200000 = NOSTOKES No measured Stokes params 0000000000400000 = BADSKY Sky level so bad that highest pixel <0. 0000000000800000 = PETROFAINT Petrosian radius(es) rejected for low SB 0000000001000000 = TOO_LARGE Object too large to measure its profile 0000000002000000 = DEBLENDEDASPSF Deblender treated obj as PSF 0000000004000000 = DEBLEND_PRUNED At least one child was removed 0000000008000000 = ELLIPFAINT Object center fainter than the isophote 0000000010000000 = BINNED1 Object detected in 1x1 binned image 0000000020000000 = BINNED2 Object detected in 2x2 binned image 0000000040000000 = BINNED4 Object detected in 4x4 binned image 0000000080000000 = MOVED Possibly moving object 0000000100000000 = DEBLENDEDASMOVING A MOVED object treated as moving. 0000000200000000 = NODEBLEND_MOVING A MOVED object not treated as moving. 0000000400000000 = TOOFEWDETECTIONS Too few detections to deblend as moving. 0000000800000000 = BADMOVINGFIT Moving fit too poor to be believable. 0000001000000000 = STATIONARY Object consistent with being stationary. 0000002000000000 = PEAKSTOOCLOSE Some peaks merged into a single peak. 0000004000000000 = MEDIAN_CENTER Center given is of median-smoothed image. 0000008000000000 = LOCAL_EDGE Center too close to an edge. 0000010000000000 = BADCOUNTSERROR Too few good pixels, error underestimated 0000020000000000 = BADMOVINGFIT_CHILD Moving child's velocity fit too poor 0000040000000000 = DEBLENDUNASSIGNEDFLUX After deblending flux not assigned 0000080000000000 = SATUR_CENTER Center is close to saturated pixel(s) 0000100000000000 = INTERP_CENTER Center is close to interpolated pixel(s) 0000200000000000 = DEBLENDEDATEDGE Object close to edge was deblended 0000400000000000 = DEBLEND_NOPEAK No detected peak within this child 0000800000000000 = PSFFLUXINTERP PSF flux from interpolated pixels > 20% 0001000000000000 = TOOFEWGOOD_DETECTIONS Too few good detections 0002000000000000 = CENTEROFFAIMAGE At least one peak's center lay off image 0004000000000000 = DEBLEND_DEGENERATE Identical candidate children, 1 retained 0008000000000000 = BRIGHTESTGALAXYCHILD Brightest member classified as galaxy 0010000000000000 = CANONICAL_BAND Band chosen as 'Canonical', generally r 0020000000000000 = AMOMENT_FAINT Object too faint to measure moments 0040000000000000 = AMOMENT_SHIFT Centroid shift too large 0080000000000000 = AMOMENT_MAXITER Maximum number of iterations exceeded 0100000000000000 = MAYBE_CR Object could actually be a cosmic ray 0200000000000000 = MAYBE_EGHOST Object could actually be a ghost 0400000000000000 = NOTCHECKED_CENTER Object center in a region not searched 0800000000000000 = OBJECT2HASSATUR_DN Trails included in estimated flux. 1000000000000020 = OBJECT2DEBLENDPEEPHOLE Deblend modified by peephole 2000000000000020 = GROWN_MERGED Growing led to a merger 4000000000000020 = HAS_CENTER Object has a canonical center 8000000000000020 = RESERVED Not used ------------------------------------------------------------------------------ Note (4): status flags written in hexadecimal, full description available at http://skyserver.sdss3.org/dr9/en/help/browser/enum.asp?n=ResolveStatus Identical in http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#&&history=search+ResolveStatus ------------------------------------------------------------------------------ 00000001 = RUN_PRIMARY Object status set in reference to its own run 00000002 = RUN_RAMP Object in what would be the overlap area of a field 00000004 = RUN_OVERLAPONLY Object only appears in the overlap between 2 fields 00000008 = RUN_IGNORE Bright or parent object that should be ignored 00000010 = RUN_EDGE Object near lowest or highest column 00000020 = RUN_DUPLICATE Duplicate measurements of same pixels in 2 fields 00000100 = SURVEY_PRIMARY Primary observation within survey (mode=1) 00000200 = SURVEY_BEST Best observation in full survey, but not primary. 00000400 = SURVEY_SECONDARY Repeat (independent) observation (mode=2) 00000800 = SURVEY_BADFIELD In field with score=0 00001000 = SURVEY_EDGE Not kept as secondary ------------------------------------------------------------------------------ Note (5): The response curves of the SDSS filters (u g r i z) can be found on the SDSS pages: http://www.sdss.org/dr5/instruments/imager/index.html The central wavelength and FWHM are: ----------------------------------------------- (nm) u' g' r' i' z' ----------------------------------------------- lambda 354.3 477.0 623.1 762.5 913.4 FWHM 56.7 138.7 137.3 152.6 95.0 ----------------------------------------------- Note that the ugriz magnitudes are not exactly on the AB scale for the u-band (uAB=umag-0.04) and z-band (zAB=zmag+0.02) (http://www.sdss.org/DR7/algorithms/fluxcal.html) Note (6): column from the "Fields" table. Dates of the observations for each colour, and their average. Note (7): column from the "SpecObjAll" table. The "SpObjID" is composed of plate + mjd + fiber + run2d with formula (the ≪n operator represents the left shift of n bits, i.e. a multiplication by 2^n): SpObjID = (plate≪50)+((mjd-50000)≪24)+(fiber≪38)+(run2d≪10) Note (8): column from the "ProperMotions" table. Note (9): the "zwarning" flag is a number made of the following bits: 1 (20) = sky fiber 2 (21) = too little wavelength coverage 4 (22) = chi-squared of best fit is too close to that of second best 8 (23) = synthetic spectrum is negative 16 (24) = fraction of points more than 5 sigma away from best model is too large (>5%) 32 (25) = chi-squared minimum at edge of the redshift fitting range 64 (26) = a QSO line exhibits negative emission (triggered only in QSO spectra if CIV, CIII, MgII, Hbeta, or Halpha has lineArea+3*(lineArea)<0) 128 (27) = the fiber was unplugged, so no spectrum obtained See http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#&&history=search+SpeczWarning Note (10): the spectroscopic Source types are summarized in the "type9.htx" file; see also the SDSS DR12 help: http://skyserver.sdss.org/dr12/en/help/browser/browser.aspx#&history=enum+AncillaryTarget1+E Note (11): the spectroscopic subclass includes: * for GALAXY classes: BROADLINE, STARFORMING, STARBURST, AGN * for STAR classes: MK spectral sub-classes, CV=Catataclysmic Variable, Carbon stars (Carbon, Carbon_lines), white dwarfs (WD, WDcooler, WDhotter, WDmagnetic, CarbonWD, CalciumWD) Note (12): If zErr=-9999, the fit failed, but the neighbors' average redshift might still be available.
Acknowledgements: It is a pleasure to thank Aniruddha R. Thakar, who provided us with the files to build this catalogue.
(End) Thomas Boch [CDS] 14-Mar-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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