V/139         The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)

The SDSS Photometric Catalog, Release 9 Ahn C.P. et al. <Astrophys. J. Suppl. Ser. 203, 21 (2012)> =2012ApJS..203...21A 2012ApJS..203...21A =2013yCat.5139....0A 2013yCat.5139....0A
ADC_Keywords: Surveys; Photometry, SDSS ; Redshifts Keywords: atlases - catalogs - surveys Abstract: The Sloan Digital Sky Survey III (SDSS-III) presents the first spectroscopic data from the Baryon Oscillation Spectroscopic Survey (BOSS). This ninth data release (DR9) of the SDSS project includes 535,995 new galaxy spectra (median z ∼ 0.52), 102,100 new quasar spectra (median z ∼ 2.32), and 90,897 new stellar spectra, along with the data presented in previous data releases. These spectra were obtained with the new BOSS spectrograph and were taken between 2009 December and 2011 July. In addition, the stellar parameters pipeline, which determines radial velocities, surface temperatures, surface gravities, and metallicities of stars, has been updated and refined with improvements in temperature estimates for stars with Teff<5000K and in metallicity estimates for stars with [Fe/H]>-0.5. DR9 includes new stellar parameters for all stars presented in DR8, including stars from SDSS-I and II, as well as those observed as part of the SEGUE-2. The astrometry error introduced in the DR8 imaging catalogs has been corrected in the DR9 data products. The next data release for SDSS-III will be in Summer 2013, which will present the first data from the APOGEE along with another year of data from BOSS, followed by the final SDSS-III data release in 2014 December. Description: Data Release 9 is the first release of the spectra from the SDSS-III's Baryon Oscillation Spectroscopic Survey (BOSS), which includes more than 800,000 spectra over 3,300 square degrees of sky, observed with the new 1,000-fiber BOSS spectrograph. DR9 also includes better stellar parameter estimates, provided by an updated SEGUE Stellar Parameter Pipeline (SSPP). The principal changes from DR8 are summarized at http://www.sdss3.org/dr9/whatsnew.php 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 sdss9.sam 1053 1000 *Sample output of the SDSS photometric catalog -------------------------------------------------------------------------------- Note on sdss9.sam: a sample close to the point (0,0) is given in "sdss9.sam". The catalog described here is a subset of the full SDSS catalog available from http://www.sdss3.org/dr9/ 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/ : The SDSS Home Page http://www.sdss3.org/dr9/ : The Nineth SDSS Data Release Home Page (2011) Byte-by-byte Description of file: sdss9.sam -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 I1 --- mode [1,2] 1: primary (469,053,874 sources), 2: secondary (324,960,076 sources). 2 A1 --- q_mode [+] '+' indicates clean photometry (105,969,748 sources with mode 1+) 3 I1 --- cl Type (class) of object (3=galaxy, 6=star) (1) 5- 23 A19 --- SDSS9 SDSS-DR9 name, based on J2000 position 24 A1 --- m_SDSS9 [*] The asterisk indicates that 2 different SDSS objects share the same SDSS9 name 27- 47 A21 --- SDSS-ID [0-9 -] SDSS object identifier (2) 49- 67 I19 --- objID SDSS unique object identifier (2) 70- 84 A15 --- Sp-ID Spectroscopic Plate-MJD-Fiber identifier (7) 86-104 I19 --- SpObjID Pointer to the spectrum of object, or 0 (7) 106-124 I19 --- parentID Pointer to parent (if object deblended) 126-145 I20 --- flags Photo Object Attribute flags (3) 147-154 A8 --- Status [0-9A-F] Hexadecimal status (4) 157-166 F10.6 deg RAdeg Right Ascension of the object (ICRS) (ra) 167-176 F10.6 deg DEdeg Declination of the object (ICRS) (dec) 178-182 F5.3 arcsec e_RAdeg Mean error on RAdeg (raErr) 184-188 F5.3 arcsec e_DEdeg Mean error on DEdeg (decErr) 190-198 F9.4 yr ObsDate Mean Observation date 200 I1 --- Q [0/5] Quality of the observation (0=unknown): 1=bad 2=acceptable 3=good 4=missing 5=hole (6) 202-207 F6.3 mag umag ? Model magnitude in u filter, AB scale (u) (5) 208 A1 --- --- [:] 209-213 F5.3 mag e_umag ? Mean error on umag (err_u) 215-220 F6.3 mag gmag ? Model magnitude in g filter, AB scale (g) (5) 221 A1 --- --- [:] 222-226 F5.3 mag e_gmag ? Mean error on gmag (err_g) 228-233 F6.3 mag rmag ? Model magnitude in r filter, AB scale (r) (5) 234 A1 --- --- [:] 235-239 F5.3 mag e_rmag ? Mean error on rmag (err_r) 241-246 F6.3 mag imag ? Model magnitude in i filter, AB scale (i) (5) 247 A1 --- --- [:] 248-252 F5.3 mag e_imag ? Mean error on imag (err_i) 254-259 F6.3 mag zmag ? Model magnitude in z filter, AB scale (z) (5) 260 A1 --- --- [:] 261-265 F5.3 mag e_zmag ? Mean error on zmag (err_z) -------------------------------------------------------------------------------- 267-274 F8.5 --- zsp ? Spectroscopic redshift (when SpObjID>0) (7) 275 A1 --- --- [:] 276-282 F7.5 --- e_zsp ? Mean error on zsp (negative for bad fit) (7) 284-286 I3 --- f_zsp [0/255]? "zwarning" flag (9) 288-293 F6.1 km/s Vdisp ? Velocity dispersion (velDisp) 294 A1 --- --- [:] 295-300 E6.3 km/s e_Vdisp ? Mean error on Vdisp (velDispErr) 302-305 A4 --- spInst [SDSS BOSS] Spectral instrument (instrument) 306 A1 --- --- [/] 307-327 A21 --- spType Source type (sourceType) (10) 329-334 A6 --- spCl Spectroscopic class (class): GALAXY, QSO, STAR 335 A1 --- --- [/] 336-357 A22 --- subClass Spectroscopic subclass (subClass) (11) 358-363 F6.2 --- spS/N ? Median signal-to-noise over all good pixels (snMedian) -------------------------------------------------------------------------------- 365-384 I20 --- uFlags Detection flags, u band (flags_u)(3) 386 I1 --- us [0,1] 0=notStar, 1=Star in u band (probPSF_u) 388 I1 --- uc [0,9] Phototype in u band, 6=Star (type_u) (1) 390-398 F9.4 yr uDate Date of observation in u band (6) 400-405 F6.3 mag u'mag ? Model magnitude in u filter (= umag) (5) 406 A1 --- --- [:] 407-412 F6.3 mag e_u'mag ? Mean error on u'mag (= e_umag) 414-419 F6.3 mag upmag ? PSF magnitude in u band (psfMag_u) 420 A1 --- --- [:] 421-426 F6.3 mag e_upmag ? Mean error on upmag (psfMagErr_u) 428-433 F6.3 mag uPmag ? Petrosian magnitude in u band (petroMag_u) 434 A1 --- --- [:] 435-440 F6.3 mag e_uPmag ? Mean error on uPmag (petroMagErr_u) 442-448 F7.3 arcsec uPrad ? Petrosian radius in u band (petroRad_u) 449 A1 --- --- [:] 450-456 F7.3 arcsec e_uPrad ? Mean error in uPrad (petroRadErr_u) 459-464 F6.2 arcsec uoRA ? Offset of u position along RA (offsetRa_u) 466-471 F6.2 arcsec uoDE ? Offset of u position along Dec (offsetDec_u) 473-479 F7.3 arcsec udVrad ? de Vaucouleurs fit radius, u band (deVRad_u) 481-487 F7.3 arcsec udVell ? de Vaucouleurs fit ellipt, u band (1-deVAB_u) 489-493 F5.1 deg uPA ? Position angle of dVrad in u band (deVPhi_u) -------------------------------------------------------------------------------- 495-514 I20 --- gFlags Detection flags, g band (flags_g)(3) 516 I1 --- gs [0,1] 0=notStar, 1=Star in g band (probPSF_g) 518 I1 --- gc [0,9] Phototype in g band, 6=Star (type_g) (1) 520-528 F9.4 yr gDate Date of observation in g band (6) 530-535 F6.3 mag g'mag ? Model magnitude in g filter (= gmag) (5) 536 A1 --- --- [:] 537-542 F6.3 mag e_g'mag ? Mean error on g'mag (= e_gmag) 544-549 F6.3 mag gpmag ? PSF magnitude in g band (psfMag_g) 550 A1 --- --- [:] 551-556 F6.3 mag e_gpmag ? Mean error on gpmag (psfMagErr_g) 558-563 F6.3 mag gPmag ? Petrosian magnitude in g band (petroMag_g) 564 A1 --- --- [:] 565-570 F6.3 mag e_gPmag ? Mean error on gPmag (petroMagErr_g) 572-578 F7.3 arcsec gPrad ? Petrosian radius in g band (petroMagErr_g) 579 A1 --- --- [:] 580-586 F7.3 arcsec e_gPrad ? Mean error in gPrad (petroMagErr_g) 589-594 F6.2 arcsec goRA ? Offset of g position along RA (offsetRa_g) 596-601 F6.2 arcsec goDE ? Offset of g position along Dec (offsetDec_g) 603-609 F7.3 arcsec gdVrad ? de Vaucouleurs fit radius, g band (deVRad_g) 611-617 F7.3 arcsec gdVell ? de Vaucouleurs fit ellipt, g band (1-deVAB_g) 619-623 F5.1 deg gPA ? Position angle of dVrad in g band (deVPhi_g) -------------------------------------------------------------------------------- 625-644 I20 --- rFlags Detection flags, r band (flags_r)(3) 646 I1 --- rs [0,1] 0=notStar, 1=Star in r band (probPSF_r) 648 I1 --- rc [0,9] Phototype in r band, 6=Star (type_r) (1) 650-658 F9.4 yr rDate Date of observation in r band (6) 660-665 F6.3 mag r'mag ? Model magnitude in r filter (= rmag) (5) 666 A1 --- --- [:] 667-672 F6.3 mag e_r'mag ? Mean error on r'mag (= e_rmag) 674-679 F6.3 mag rpmag ? PSF magnitude in r band (psfMag_r) 680 A1 --- --- [:] 681-686 F6.3 mag e_rpmag ? Mean error on rpmag (psfMagErr_r) 688-693 F6.3 mag rPmag ? Petrosian magnitude in r band (petroMag_r) 694 A1 --- --- [:] 695-700 F6.3 mag e_rPmag ? Mean error on rPmag (petroMagErr_r) 702-708 F7.3 arcsec rPrad ? Petrosian radius in r band (petroMagErr_r) 709 A1 --- --- [:] 710-716 F7.3 arcsec e_rPrad ? Mean error in rPrad (petroMagErr_r) 719-724 F6.2 arcsec roRA ? Offset of r position along RA (offsetRa_r) 726-731 F6.2 arcsec roDE ? Offset of r position along Dec (offsetDec_r) 733-739 F7.3 arcsec rdVrad ? de Vaucouleurs fit radius, r band (deVRad_r) 741-747 F7.3 arcsec rdVell ? de Vaucouleurs fit ellipt, r band (1-deVAB_r) 749-753 F5.1 deg rPA ? Position angle of dVrad in r band (deVPhi_r) -------------------------------------------------------------------------------- 755-774 I20 --- iFlags Detection flags, i band (flags_i)(3) 776 I1 --- is [0,1] 0=notStar, 1=Star in i band (probPSF_i) 778 I1 --- ic [0,9] Phototype in i band, 6=Star (type_i) (1) 780-788 F9.4 yr iDate Date of observation in i band (6) 790-795 F6.3 mag i'mag ? Model magnitude in i filter (= imag) (5) 796 A1 --- --- [:] 797-802 F6.3 mag e_i'mag ? Mean error on i'mag (= e_imag) 804-809 F6.3 mag ipmag ? PSF magnitude in i band (psfMag_i) 810 A1 --- --- [:] 811-816 F6.3 mag e_ipmag ? Mean error on ipmag (psfMagErr_i) 818-823 F6.3 mag iPmag ? Petrosian magnitude in i band (petroMag_i) 824 A1 --- --- [:] 825-830 F6.3 mag e_iPmag ? Mean error on iPmag (petroMagErr_i) 832-838 F7.3 arcsec iPrad ? Petrosian radius in i band (petroMagErr_i) 839 A1 --- --- [:] 840-846 F7.3 arcsec e_iPrad ? Mean error in iPrad (petroMagErr_i) 849-854 F6.2 arcsec ioRA ? Offset of i position along RA (offsetRa_i) 856-861 F6.2 arcsec ioDE ? Offset of i position along Dec (offsetDec_i) 863-869 F7.3 arcsec idVrad ? de Vaucouleurs fit radius, i band (deVRad_i) 871-877 F7.3 arcsec idVell ? de Vaucouleurs fit ellipt, i band (1-deVAB_i) 879-883 F5.1 deg iPA ? Position angle of dVrad in i band (deVPhi_i) -------------------------------------------------------------------------------- 885-904 I20 --- zFlags Detection flags, z band (flags_z)(3) 906 I1 --- zs [0,1] 0=notStar, 1=Star in z band (probPSF_z) 908 I1 --- zc [0,9] Phototype in z band, 6=Star (type_z) (1) 910-918 F9.4 yr zDate Date of observation in z band (6) 920-925 F6.3 mag z'mag ? Model magnitude in z filter (= zmag) (5) 926 A1 --- --- [:] 927-932 F6.3 mag e_z'mag ? Mean error on z'mag (= e_zmag) 934-939 F6.3 mag zpmag ? PSF magnitude in z band (psfMag_z) 940 A1 --- --- [:] 941-946 F6.3 mag e_zpmag ? Mean error on zpmag (psfMagErr_z) 948-953 F6.3 mag zPmag ? Petrosian magnitude in z band (petroMag_z) 954 A1 --- --- [:] 955-960 F6.3 mag e_zPmag ? Mean error on zPmag (petroMagErr_z) 962-968 F7.3 arcsec zPrad ? Petrosian radius in z band (petroMagErr_z) 969 A1 --- --- [:] 970-976 F7.3 arcsec e_zPrad ? Mean error in zPrad (petroMagErr_z) 979-984 F6.2 arcsec zoRA ? Offset of z position along RA (offsetRa_z) 986-991 F6.2 arcsec zoDE ? Offset of z position along Dec (offsetDec_z) 993-999 F7.3 arcsec zdVrad ? de Vaucouleurs fit radius, z band (deVRad_z) 1001-1007 F7.3 arcsec zdVell ? de Vaucouleurs fit ellipt, z band (1-deVAB_z) 1009-1013 F5.1 deg zPA ? Position angle of dVrad in z band (deVPhi_z) -------------------------------------------------------------------------------- 1015-1020 I6 mas/yr pmRA ? Proper motion along RightAscension (pmRa) (8) 1021 A1 --- --- [:] 1022-1024 I3 mas/yr e_pmRA ? Mean error on pmRA (pmRaErr) (8) 1026-1031 I6 mas/yr pmDE ? Proper motion along Declination (pmDec) (8) 1032 A1 --- --- [:] 1033-1035 I3 mas/yr e_pmDE ? Mean error on pmDE (pmDecErr) (8) 1037-1041 F5.2 arcsec sigRA ? RMS residual of proper motion fit in RA (8) 1043-1047 F5.2 arcsec sigDE ? RMS residual of proper motion fit in Dec (8) 1049 I1 --- M Number of USNO-B objects matched within 1arcsec (match) (8) 1051 I1 --- N Number of detections used in the pm fit, including SDSS (nFit) (8) 1053-1056 F4.1 mag g(O) ? Magnitude from O plate recalibrated to g (8) 1058-1061 F4.1 mag r(E) ? Magnitude from E plate recalibrated to r (8) 1063-1066 F4.1 mag g(J) ? Magnitude from J plate recalibrated to g (8) 1068-1071 F4.1 mag r(F) ? Magnitude from F plate recalibrated to r (8) 1073-1076 F4.1 mag i(N) ? Magnitude from N plate recalibrated to i (8) 1077 A1 --- --- [|] -------------------------------------------------------------------------------- Note (1): the type (class) is numbered as follows: 0 = Unknown: Object type is not known. 25 = Cosmic-ray track (not used). 26 = Defect (not used) 27 = Galaxy: An extended object composed of many stars and other matter. 28 = Ghost: Object created by reflected or refracted light. (not used) 29 = KnownObject: Object came from some other catalog (not yet used) 30 = Star: A a self-luminous gaseous celestial body. 31 = Trail: A satellite or asteroid or meteor trail. (not yet used) 32 = Sky: Blank sky spectrogram (no objects in this arcsecond area). 33 = NotAType 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 2n): 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.sdss3.org/dr9/en/help/browser/enum.asp?n=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. 1000000000000044 = OBJECT2DEBLENDPEEPHOLE Deblend modified by peephole 2000000000000044 = GROWN_MERGED Growing led to a merger 4000000000000044 = HAS_CENTER Object has a canonical center 8000000000000044 = 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 ------------------------------------------------------------------------------- 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 2n): 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: 25 (20) = sky fiber 26 (21) = too little wavelength coverage 28 (22) = chi-squared of best fit is too close to that of second best 32 (23) = synthetic spectrum is negative 40 (24) = fraction of points more than 5σ away from best model is too large (>5%) 56 (25) = chi-squared minimum at edge of the redshift fitting range 88 (26) = a QSO line exhibits negative emission (triggered only in QSO spectra if CIV, CIII, MgII, Hβ, or Hα has lineArea+3σ(lineArea)<0) 152 (27) = the fiber was unplugged, so no spectrum obtained Note (10): the spectroscopic Source types are summarized in the "type9.htx" file; see also the SDSS-III glossary http://data.sdss3.org/datamodel/glossary.html 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) -------------------------------------------------------------------------------- Nomenclature Notes: While the 19-digit "objID" numbers have not changed between the releases DR8 and DR9, the names based on the J2000 position (JHHMMSS.ss+DDMMSS.s) generally differ between the 2 releases. Acknowledgements: It is a pleasure to thank Aniruddha R. Thakar, who prepared the huge files to build this catalog.
(End) Francois Ochsenbein [CDS] 25-Feb-2013
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