2022-03-25T12:17:21Z 50 SDSS DR16 Selection This is a redacted version of the SDSS DR16 table prepared for VizieR (V/154/sdss16). It is mainly here to facilitate local matches; for original SDSS-related research, it is probably better to somewhere else. Over VizieR and SDSS, we are keeping most of the per-band values in arrays to keep the column list manageable. Note that in ADQL, array indexes are 1-based. We are trying to orient our column names on SDSS but use underscores instead of camel-casing (e.g. spec_obj_id instead of SpecObjID), since mixed-case identifiers in SQL is asking for trouble. To save space, we do not keep psf-based classifications, per-band offsets, spectrum metadata, and USNO-related information in this table. Let the operators know if you need any of that. redshift-surveys stellar-properties humada, Romina ; Prieto, Carlos Allende ; Almeida, Andrés ; Anders, Friedrich ; Anderson, Scott F. ; Andrews, Brett H. ; Anguiano, Borja ; Arcodia, Riccardo ; Armengaud, Eric ; Aubert, Marie ; Avila, Santiago ; Avila-Reese, Vladimir ; Badenes, Carles ; Balland, Christophe ; Barger, Kat ; Barrera-Ballesteros, Jorge K. ; Basu, Sarbani ; Bautista, Julian ; Beaton, Rachael L. ; Beers, Timothy C. ; Benavides, B. Izamar T. ; Bender, Chad F. ; Bernardi, Mariangela ; Bershady, Matthew ; Beutler, Florian ; Bidin, Christian Moni ; Bird, Jonathan ; Bizyaev, Dmitry ; Blanc, Guillermo A. ; Blanton, Michael R. ; Boquien, Médéric ; Borissova, Jura ; Bovy, Jo ; Brandt, W. N. ; Brinkmann, Jonathan ; Brownstein, Joel R. ; Bundy, Kevin ; Bureau, Martin ; Burgasser, Adam ; Burtin, Etienne ; Cano-Díaz, Mariana ; Capasso, Raffaella ; Cappellari, Michele ; Carrera, Ricardo ; Chabanier, Solène ; Chaplin, William ; Chapman, Michael ; Cherinka, Brian ; Chiappini, Cristina ; Doohyun Choi, Peter; et al APOGEE-2 eBOSS APO 2020ApJS..249....3A Research Catalog Please see http://www.sdss.org/collaboration/citing-sdss/ for the authors' requests on how to cite this material. Optical obj_id Position ICRS "ra" "dec" item, ucd u, em.opt.u g, em.opt.v r, em.opt.r i, em.opt.i z, em.opt.i 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). 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 ================= ============================================================ ]]> We have retained the CDS practice of setting PSF and Petrosian magnitudes to NaN values when corresponding errors>100; errors >100 have been set to NaN values. Status flags written in decimal (`full description`_) .. _full description: http://skyserver.sdss.org/dr16/en/help/browser/browser.aspx#&&history=enum+ResolveStatus+E ========= ================= ================================================== 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 ========= ================= ================================================== (`Further explanations to use this flag`_) .. _Further explanations to use this flag: http://www.sdss.org/dr17/algorithms/resolve/ Columns from the `SpecObjAll table`_ .. _SpecObjAll table: http://skyserver.sdss.org/dr16/en/help/browser/browser.aspx#&&history=description+SpecObjAll+U The response curves of the SDSS filters (u g r i z) can be found on the SDSS page http://classic.sdss.org/dr7/instruments/imager 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 (:math:`u_{AB}=u0.04`) and z-band (:math:`z_{AB}=z+0.02`) (http://www.sdss.org/dr16/algorithms/fluxcal/#SDSStoAB) The spectroscopic source types are described at http://skyserver.sdss.org/dr16/en/help/browser/browser.aspx#&&history=enum+SourceType+E 5%) 32 chi-squared minimum at edge of the redshift fitting range 64 a QSO line exhibits negative emission 128 the fiber was unplugged, so no spectrum obtained ===== ============================================================================= The flag 64 is only triggered in QSO spectra if CIV, CIII, MgII, Hβ, or Hα has :math:`\\textrm{lineArea}+3 ⋅ (\\textrm{lineArea})<0`. See also http://skyserver.sdss.org/dr16/en/help/browser/browser.aspx#&&history=search+SpeczWarning ]]> 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) Columns from the `ProperMotions table`_. .. _ProperMotions table: http://skyserver.sdss.org/dr16/en/help/browser/browser.aspx#&&history=description+ProperMotions+U Columns from the `Photoz table`_ .. _Photoz table: http://skyserver.sdss.org/dr16/en/help/browser/browser.aspx#&&history=description+Photoz+U Columns from the `Field table` .. _Field table: http://skyserver.sdss.org/dr16/en/help/browser/browser.aspx#&&history=description+Field+U sdssdr16 cone 134.8728 0.1080 0.001 cone/scs.xml row = self.getFirstVOTableRow(rejectExtras=False) self.assertAlmostEqual(row["ra"], 134.87283405788) self.assertAlmostEqual(row["pm_ra"], None) self.assertAlmostEqual(row["dev_rads"][0], 0.01600508578121662) self.assertAlmostEqual(row["types"][-1], 3) /tap/sync rows = self.getVOTableRows() self.assertEqual(len(rows), 12) for row in rows: if row["obj_id"]==1237678875095007242: self.assertAlmostEqual(row["psfmags"][0], 18.82402229309082) break else: raise AssertionError("Had expeceted SDSS object" " 1237678875095007242 here, but it was not returned")