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II/267       The SDSS Photometric Catalog, Release 4   (Adelman-McCarthy+, 2006)

The SDSS Photometric Catalog, Release 4 Adelman-McCarthy J.K. et al. <Astrophys. J. Suppl. Ser., 162, 38 (2006)> =2006ApJS..162...38A
ADC_Keywords: Surveys; Photometry, SDSS Keywords: atlases - catalogs - surveys Description: The present catalog is a subset of the data release 4 of the Sloan Digital Sky Survey (SDSS), restricted to primary and secondary photo objects (i.e. objects from PhotoPrimary of PhotoSecondary tables) and restricted to the columns described in the "Byte-by-Byte" description below. The complete SDSS data release 4 catalog is available from http://www.sdss.org/dr4/ The Sloan Digital Sky Survey (SDSS) will map in detail one-quarter of the entire sky, determining the positions and absolute brightnesses of more than 100 million celestial objects. It will also measure the distances to more than a million galaxies and quasars. Apache Point Observatory, site of the SDSS telescopes, is operated by the Astrophysical Research Consortium (ARC). Funding for the SDSS has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the U.S. Department of Energy, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS is a joint project of The University of Chicago, Fermilab, the Institute for Advanced Study, the Japan Participation Group, The Johns Hopkins University, the Korean Scientist Group, Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPIA), the Max-Planck-Institute for Astrophysics (MPA), New Mexico State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory, and the University of Washington. All details about ADSS at http://www.sdss.org/dr4/ Acknowledging SDSS: The usage of the SDSS should be acknowledged, see http://www.sdss.org/collaboration/credits.html File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sdss4.sam 871 100 *Sample output of the SDSS-DR4 photometric catalog
Note on sdss4.sam: a sample close to the zero point is given here. The catalog described here is a subset of the full SDSS-DR4 catalog available from http://www.sdss.org/dr4/ 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.sdss.org/dr4/ : The SDSS Data Release 4 Home Page Byte-by-byte Description of file: sdss4.sam
Bytes Format Units Label Explanations
1 I1 --- mode [1,2] 1: primary, 2: secondary 3: family object (not here) 3 I1 --- cl Type (class) of the object (type) (1) 5- 23 A19 --- SDSS Recommended SDSS name, based on J2000 position 24 A1 --- m_SDSS [*] The asterisk indicates that 2 different SDSS objects share the same SDSS name 26 A1 --- R [3] Release: blank for new, '3' included in DR3 28- 42 A15 --- SDSS-ID [0-9.] SDSS object identifier (2) 44- 61 A18 --- objID [0-9] SDSS unique object identifier (2) 63- 80 A18 --- SpObjID Pointer to the spectrum of object, or 0 82- 99 A18 --- parentID Pointer to parent (if object deblended) 101-102 I2 --- rerun [40,44] Re-run number (2) 104-119 A16 --- flags [0-9A-F] Photo Object Attribute flags (3) 121-128 A8 --- Status [0-9A-F] Hexadecimal status (4) 131-140 F10.6 deg RAdeg Right Ascension of the object (ICRS) 141-150 F10.6 deg DEdeg Declination of the object (ICRS) 152-156 F5.3 arcsec e_RAdeg Mean error on RAdeg 158-162 F5.3 arcsec e_DEdeg Mean error on DEdeg 164-168 F5.2 --- ccPos Correlation between e_RAdeg and e_DEdeg 170-178 F9.4 yr ObsDate Observation date 180 I1 --- Q Quality of the observation: 1=bad 2=acceptable 3=good 4=missing 5=hole 182-187 F6.3 mag umag Model magnitude in u filter (5) 188 A1 --- --- [`] 189-193 F5.3 mag e_umag Mean error on umag 195-200 F6.3 mag gmag Model magnitude in g filter (5) 201 A1 --- --- [`] 202-206 F5.3 mag e_gmag Mean error on gmag 208-213 F6.3 mag rmag Model magnitude in r filter (5) 214 A1 --- --- [`] 215-219 F5.3 mag e_rmag Mean error on rmag 221-226 F6.3 mag imag Model magnitude in i filter (5) 227 A1 --- --- [`] 228-232 F5.3 mag e_imag Mean error on imag 234-239 F6.3 mag zmag Model magnitude in z filter (5) 240 A1 --- --- [`] 241-245 F5.3 mag e_zmag Mean error on zmag -------------------------------------------------------------------------------- 247-262 A16 --- uFlags [0-9A-F] Detection flags, u band (flags_u)(3) 264 I1 --- us [0,1] 0=notStar, 1=Star in u band (probPSF_u) 266 I1 --- uc [0,9] Phototype in u band, 6=Star (type_u) (1) 268-276 F9.4 yr uDate Date of observation in u band 278-283 F6.3 mag u'mag ? Model magnitude in u filter (= umag) (5) 284 A1 --- --- [`] 285-290 F6.3 mag e_u'mag ? Mean error on u'mag (= e_umag) 292-297 F6.3 mag upmag ? PSF magnitude in u band (psfMag_u) 298 A1 --- --- [`] 299-304 F6.3 mag e_upmag ? Mean error on upmag (psfMagErr_u) 306-311 F6.3 mag uPmag ? Petrosian magnitude in u band (petroMag_u) 312 A1 --- --- [`] 313-318 F6.3 mag e_uPmag ? Mean error on uPmag (petroMagErr_u) 320-326 F7.3 arcsec uPrad ? Petrosian radius in u band (petroRad_u) 327 A1 --- --- [`] 328-334 F7.3 arcsec e_uPrad ? Mean error in uPrad (petroRadErr_u) 336-341 F6.2 arcsec uoRA ? Offset of u position along RA (offsetRa_u) 343-348 F6.2 arcsec uoDE ? Offset of u position along Dec (offsetDec_u) 350-356 F7.3 arcsec uisoA ? Isophotal major diameter in u band (isoA_u) 358-364 F7.3 arcsec uisoB ? Isophotal minor diameter in u band (isoB_u) 366-370 F5.1 deg uPA ? Position angle of uisoA in u band (isoPhi_u) -------------------------------------------------------------------------------- 372-387 A16 --- gFlags [0-9A-F] Detection flags, g band (flags_g)(3) 389 I1 --- gs [0,1] 0=notStar, 1=Star in g band (probPSF_g) 391 I1 --- gc [0,9] Phototype in g band, 6=Star (type_g) (1) 393-401 F9.4 yr gDate Date of observation in g band 403-408 F6.3 mag g'mag ? Model magnitude in g filter (= gmag) (5) 409 A1 --- --- [`] 410-415 F6.3 mag e_g'mag ? Mean error on g'mag (= e_gmag) 417-422 F6.3 mag gpmag ? PSF magnitude in g band (psfMag_g) 423 A1 --- --- [`] 424-429 F6.3 mag e_gpmag ? Mean error on gpmag (psfMagErr_g) 431-436 F6.3 mag gPmag ? Petrosian magnitude in g band (petroMag_g) 437 A1 --- --- [`] 438-443 F6.3 mag e_gPmag ? Mean error on gPmag (petroMagErr_g) 445-451 F7.3 arcsec gPrad ? Petrosian radius in g band (petroMagErr_g) 452 A1 --- --- [`] 453-459 F7.3 arcsec e_gPrad ? Mean error in gPrad (petroMagErr_g) 461-466 F6.2 arcsec goRA ? Offset of g position along RA (offsetRa_g) 468-473 F6.2 arcsec goDE ? Offset of g position along Dec (offsetDec_g) 475-481 F7.3 arcsec gisoA ? Isophotal major diameter in g band (isoA_g) 483-489 F7.3 arcsec gisoB ? Isophotal minor diameter in g band (isoB_g) 491-495 F5.1 deg gPA ? Position angle of gisoA in g band (isoPhi_g) -------------------------------------------------------------------------------- 497-512 A16 --- rFlags [0-9A-F] Detection flags, r band (flags_r)(3) 514 I1 --- rs [0,1] 0=notStar, 1=Star in r band (probPSF_r) 516 I1 --- rc [0,9] Phototype in r band, 6=Star (type_r) (1) 518-526 F9.4 yr rDate Date of observation in r band 528-533 F6.3 mag r'mag ? Model magnitude in r filter (= rmag) (5) 534 A1 --- --- [`] 535-540 F6.3 mag e_r'mag ? Mean error on r'mag (= e_rmag) 542-547 F6.3 mag rpmag ? PSF magnitude in r band (psfMag_r) 548 A1 --- --- [`] 549-554 F6.3 mag e_rpmag ? Mean error on rpmag (psfMagErr_r) 556-561 F6.3 mag rPmag ? Petrosian magnitude in r band (petroMag_r) 562 A1 --- --- [`] 563-568 F6.3 mag e_rPmag ? Mean error on rPmag (petroMagErr_r) 570-576 F7.3 arcsec rPrad ? Petrosian radius in r band (petroMagErr_r) 577 A1 --- --- [`] 578-584 F7.3 arcsec e_rPrad ? Mean error in rPrad (petroMagErr_r) 586-591 F6.2 arcsec roRA ? Offset of r position along RA (offsetRa_r) 593-598 F6.2 arcsec roDE ? Offset of r position along Dec (offsetDec_r) 600-606 F7.3 arcsec risoA ? Isophotal major diameter in r band (isoA_r) 608-614 F7.3 arcsec risoB ? Isophotal minor diameter in r band (isoB_r) 616-620 F5.1 deg rPA ? Position angle of risoA in g band (isoPhi_r) -------------------------------------------------------------------------------- 622-637 A16 --- iFlags [0-9A-F] Detection flags, i band (flags_i)(3) 639 I1 --- is [0,1] 0=notStar, 1=Star in i band (probPSF_i) 641 I1 --- ic [0,9] Phototype in i band, 6=Star (type_i) (1) 643-651 F9.4 yr iDate Date of observation in i band 653-658 F6.3 mag i'mag ? Model magnitude in i filter (= imag) (5) 659 A1 --- --- [`] 660-665 F6.3 mag e_i'mag ? Mean error on i'mag (= e_imag) 667-672 F6.3 mag ipmag ? PSF magnitude in i band (psfMag_i) 673 A1 --- --- [`] 674-679 F6.3 mag e_ipmag ? Mean error on ipmag (psfMagErr_i) 681-686 F6.3 mag iPmag ? Petrosian magnitude in i band (petroMag_i) 687 A1 --- --- [`] 688-693 F6.3 mag e_iPmag ? Mean error on iPmag (petroMagErr_i) 695-701 F7.3 arcsec iPrad ? Petrosian radius in i band (petroMagErr_i) 702 A1 --- --- [`] 703-709 F7.3 arcsec e_iPrad ? Mean error in iPrad (petroMagErr_i) 711-716 F6.2 arcsec ioRA ? Offset of i position along RA (offsetRa_i) 718-723 F6.2 arcsec ioDE ? Offset of i position along Dec (offsetDec_i) 725-731 F7.3 arcsec iisoA ? Isophotal major diameter in i band (isoA_i) 733-739 F7.3 arcsec iisoB ? Isophotal minor diameter in i band (isoB_i) 741-745 F5.1 deg iPA ? Position angle of iisoA in g band (isoPhi_i) -------------------------------------------------------------------------------- 747-762 A16 --- zFlags [0-9A-F] Detection flags, z band (flags_z)(3) 764 I1 --- zs [0,1] 0=notStar, 1=Star in z band (probPSF_z) 766 I1 --- zc [0,9] Phototype in z band, 6=Star (type_z) (1) 768-776 F9.4 yr zDate Date of observation in z band 778-783 F6.3 mag z'mag ? Model magnitude in z filter (= zmag) (5) 784 A1 --- --- [`] 785-790 F6.3 mag e_z'mag ? Mean error on z'mag (= e_zmag) 792-797 F6.3 mag zpmag ? PSF magnitude in z band (psfMag_z) 798 A1 --- --- [`] 799-804 F6.3 mag e_zpmag ? Mean error on zpmag (psfMagErr_z) 806-811 F6.3 mag zPmag ? Petrosian magnitude in z band (petroMag_z) 812 A1 --- --- [`] 813-818 F6.3 mag e_zPmag ? Mean error on zPmag (petroMagErr_z) 820-826 F7.3 arcsec zPrad ? Petrosian radius in z band (petroMagErr_z) 827 A1 --- --- [`] 828-834 F7.3 arcsec e_zPrad ? Mean error in zPrad (petroMagErr_z) 836-841 F6.2 arcsec zoRA ? Offset of z position along RA (offsetRa_z) 843-848 F6.2 arcsec zoDE ? Offset of z position along Dec (offsetDec_z) 850-856 F7.3 arcsec zisoA ? Isophotal major diameter in z band (isoA_z) 858-864 F7.3 arcsec zisoB ? Isophotal minor diameter in z band (isoB_z) 866-870 F5.1 deg zPA ? Position angle of zisoA in g band (isoPhi_z) 871 A1 --- --- [|]
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. 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. 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 Note (2): the SDSS identifier is composed of the skyVersion number, run, rerun, camcol, field and object number. The SDSS-ID is written run.cam.field.obj (4 numbers and 3 separator dots). The objID is also combined from these numbers: objID = skyVersion≪59 + rerun≪48 + run≪32 + camcol≪29 + field≪16 + obj Note (3): flags written in hexadecimal, full description available at http://cas.sdss.org/astro/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. 1000000000000000 = OBJECT2DEBLENDPEEPHOLE Deblend modified by peephole 2000000000000000 = GROWN_MERGED Growing led to a merger 4000000000000000 = HAS_CENTER Object has a canonical center 8000000000000000 = RESERVED Not used ------------------------------------------------------------------------------ Note (4): status flags written in hexadecimal, full description available at http://cas.sdss.org/astro/en/help/browser/enum.asp?n=PhotoStatus ------------------------------------------------------------------------------ 00000001 = SET Object status has been set in reference to its own run 00000002 = GOOD Object is good -- absence implies bad. 00000004 = DUPLICATE Duplicate detections in an adjacent field 00000010 = OK_RUN Object is usable 00000020 = RESOLVED Object has been resolved against other runs. 00000040 = PSEGMENT Object Belongs to a PRIMARY segment. 00000100 = FIRST_FIELD Object belongs to the first field in its segment. 00000200 = OK_SCANLINE Object lies within valid nu range for its scanline. 00000400 = OK_STRIPE Object lies within valid eta range for its stripe. 00001000 = SECONDARY This is a secondary survey object. 00002000 = PRIMARY This is a primary survey object. 00004000 = TARGET This is a spectroscopic target. ------------------------------------------------------------------------------ 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/dr4/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 -----------------------------------------------

(End) Francois Ochsenbein [CDS] 27-Dec-2005
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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