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J/A+A/539/A80       SDSS DR7 superclusters. The catalogues   (Liivamagi+, 2012)

SDSS DR7 superclusters. The catalogues. Liivamagi L.J., Tempel E., Saar E. <Astron. Astrophys. 539, A80 (2012)> =2012A&A...539A..80L
ADC_Keywords: Clusters, galaxy Keywords: large-scale structure of the Universe - galaxies: clusters: general Abstract: We have constructed a set of supercluster catalogues for the galaxies from the SDSS survey main and luminous red galaxy (LRG) flux-limited samples. To delineate superclusters, we calculated luminosity density fields using the B3-spline kernel of the radius of 8Mpc/h for the main sample and 16Mpc/h for the LRG sample and define regions with densities over a selected threshold as superclusters, while utilising almost the whole volume of both samples. We created two types of catalogues, one with an adaptive local threshold and a set of catalogues with different global thresholds. We describe the supercluster catalogues and their general properties. Using smoothed bootstrap, we find uncertainty estimates for the density field and use these to attribute confidence levels to the catalogue objects. We have also created a test catalogue for the galaxies from the Millennium simulation to compare the simulated and observed superclusters and to clarify the methods we use. We find that the superclusters are well-defined systems, and the properties of the superclusters of the main and LRG samples are similar. We also show that with adaptive local thresholds we get a sample of superclusters, the properties of which do not depend on their distance from the observer. The Millennium galaxy catalogue superclusters are similar to those observed. Description: Excerpt of the SDSS DR7 supercluster catalogue containing four tables: two for the main and two for LRG samples. For both samples, one table contains the fixed threshold superclusters and the adaptively assigned threshold superclusters. Full dataset for all density thresholds is accessible at http://meteo.physic.ut.ee/~juhan/super/ . File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file main50.dat 274 982 Main sample D=5.0 mdens threshold catalog mainadap.dat 284 1313 Main sample adaptive threshold catalog lrg44.dat 264 3761 Luminous Red Galaxy (LRG) sample D=4.4 mdens threshold catalog lrgadap.dat 274 2701 Luminous Red Galaxy (LRG) sample adaptive threshold catalog
See also: J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010) Byte-by-byte Description of file: main50.dat
Bytes Format Units Label Explanations
1- 12 A12 --- UID Name (NNN+NNN+NNNN) 16- 20 I5 --- ID [1/1440] Short unique ID 27- 30 I4 --- Ngal Number of galaxies 38- 40 I3 --- Ngr Number of groups (G1) 48- 52 I5 Mpc3 Vol Supercluster volume (in (Mpc/h)3 units) 53- 54 A2 --- --- [.0] 61- 68 F8.3 10+10Lsun dlum Supercluster luminosity from density field 74- 82 F9.4 10+10Lsun slum Sum of supercluster galaxy luminosities (G3) 88- 96 F9.4 10+10Lsun wlum Sum of weighted supercluster galaxy luminosities 105-110 F6.3 --- Peak Value of highest supercluster peak density (in mdens units) (G4) 118 I1 --- Nsps Number of the density peaks in supercluster 124-130 F7.3 deg RA1deg Right ascension (J2000) of highest density peak 137-142 F6.3 deg DE1deg Declination (J2000) of highest density peak 148-154 F7.3 Mpc Dist1 Distance to highest density peak (Mpc/h) 160-166 F7.3 deg RA2deg Right ascension (J2000) of mass centre 173-178 F6.3 deg DE2deg Declination (J2000) of mass centre 184-190 F7.3 Mpc Dist2 Distance to mass centre (Mpc/h) 195-202 F8.4 Mpc Diam Supercluster diameter (Mpc/h) 209-214 I6 --- mgID Marker galaxy ID (G5) 220-226 F7.3 deg RA3deg Right ascension (J2000) of marker galaxy 233-238 F6.3 deg DE3deg Declination (J2000) of marker galaxy 243-250 F8.6 --- mgz Redshift of marker galaxy 256-262 F7.4 --- Conf Supercluster confidence estimate 268 I1 --- Edge [0/1] 1=Mask boundary contact 274 I1 --- Comp [0/5] Number of splitting objects
Byte-by-byte Description of file: mainadap.dat
Bytes Format Units Label Explanations
1- 12 A12 --- UID Name (NNN+NNN+NNNN) 16- 20 I5 --- ID [1/4060] Short unique ID 27- 29 F3.1 --- D Supercluster adaptive threshold (in mdens units) (G4) 30 A1 --- --- [0] 37- 40 I4 --- Ngal Number of galaxies 48- 50 I3 --- Ngr Number of groups (G1) 58- 62 I5 Mpc3 Vol Supercluster volume (in (Mpc/h)3 units) 63- 64 A2 --- --- [.0] 71- 78 F8.3 10+10Lsun dlum Supercluster luminosity from density field 84- 92 F9.4 10+10Lsun slum Sum of supercluster galaxy luminosities (G3) 98-106 F9.4 10+10Lsun wlum Sum of weighted supercluster galaxy luminosities 115-120 F6.3 --- Peak Value of highest supercluster peak density (in mdens units) (G4) 128 I1 --- Nsps Number of the density peaks in supercluster 134-140 F7.3 deg RA1deg Right ascension (J2000) of highest density peak 147-152 F6.3 deg DE1deg Declination (J2000) of highest density peak 158-164 F7.3 Mpc Dist1 Distance to highest density peak (in Mpc/h) 170-176 F7.3 deg RA2deg Right ascension (J2000) of mass centre 183-188 F6.3 deg DE2deg Declination (J2000) of mass centre 194-200 F7.3 Mpc Dist2 Distance to mass centre (in Mpc/h) 205-212 F8.4 Mpc Diam Supercluster diameter (in Mpc/h) 219-224 I6 --- mgID Marker galaxy ID (in Tago et al 2010) 230-236 F7.3 deg RA3deg Right ascension (J2000) of marker galaxy 243-248 F6.3 deg DE3deg Declination (J2000) of marker galaxy 253-260 F8.6 --- mgz Redshift of marker galaxy 266-272 F7.4 --- Conf Supercluster confidence estimate 278 I1 --- Edge [0/1] 1=Mask boundary contact 284 I1 --- Comp [0/6] Number of splitting objects
Byte-by-byte Description of file: lrg44.dat
Bytes Format Units Label Explanations
1- 12 A12 --- UID Name (NNN+NNN+NNNN) 16- 20 I5 --- ID [1/6115] Short unique ID 27- 30 I4 --- Ngal Number of galaxies 37- 42 I6 Mpc3 Vol Supercluster volume (in (Mpc/h)3 units) 43- 44 A2 --- --- [.0] 51- 58 F8.3 10+10Lsun dlum Supercluster luminosity from density field 64- 72 F9.4 10+10Lsun slum Sum of supercluster galaxy luminosities (G3) 78- 86 F9.4 10+10Lsun wlum Sum of weighted supercluster galaxy luminosities 95-100 F6.3 --- Peak Value of highest supercluster peak density (in mdens unit) (G4) 107-108 I2 --- Nsps Number of the density peaks in supercluster 114-120 F7.3 deg RA1deg Right ascension (J2000) of highest density peak 127-132 F6.3 deg DE1deg Declination (J2000) of highest density peak 137-144 F8.3 Mpc Dist1 Distance to highest density peak (in Mpc/h) 150-156 F7.3 deg RA2deg Right ascension (J2000) of mass centre 163-168 F6.3 deg DE2deg Declination (J2000) of mass centre 173-180 F8.3 Mpc Dist2 Distance to mass centre (in Mpc/h) 185-192 F8.4 Mpc Diam Supercluster diameter (in Mpc/h) 199-204 I6 --- mgID Marker galaxy ID 210-216 F7.3 deg RA3deg Right ascension (J2000) of marker galaxy 223-228 F6.3 deg DE3deg Declination (J2000) of marker galaxy 233-240 F8.6 --- mgz Redshift of marker galaxy 246-252 F7.4 --- Conf Supercluster confidence estimate 258 I1 --- Edge [0/1] 1=Mask boundary contact 264 I1 --- Comp [0/4] Number of splitting objects
Byte-by-byte Description of file: lrgadap.dat
Bytes Format Units Label Explanations
1- 12 A12 --- UID Name (NNN+NNN+NNNN) 16- 20 I5 --- ID [1/10865] Short unique ID 27- 29 F3.1 --- D Supercluster adaptive threshold (in mdens units) (G4) 31 A1 --- --- [0] 37- 40 I4 --- Ngal Number of galaxies 47- 52 I6 Mpc3 Vol Supercluster volume (in (Mpc/h)3 units) 53- 54 A2 --- --- [.0] 61- 68 F8.3 10+10Lsun dlum Supercluster luminosity from density field 74- 82 F9.4 10+10Lsun slum Sum of supercluster galaxy luminosities (G3) 88- 96 F9.4 10+10Lsun wlum Sum of weighted supercluster galaxy luminosities 105-110 F6.3 --- Peak Value of highest supercluster peak density (in mdens units) (G4) 117-118 I2 --- Nsps Number of the density peaks in supercluster 124-130 F7.3 deg RA1deg Right ascension (J2000) of highest density peak 137-142 F6.3 deg DE1deg Declination (J2000) of highest density peak 147-154 F8.3 Mpc Dist1 Distance to highest density peak 160-166 F7.3 deg RA2deg Right ascension (J2000) of mass centre 173-178 F6.3 deg DE2deg Declination (J2000) of mass centre 183-190 F8.3 Mpc Dist2 Distance to mass centre 195-202 F8.4 Mpc Diam Supercluster diameter 209-214 I6 --- mgID Marker galaxy ID 220-226 F7.3 deg RA3deg Right ascension (J2000) of marker galaxy 233-238 F6.3 deg DE3deg Declination (J2000) of marker galaxy 243-250 F8.6 --- mgz Redshift of marker galaxy 256-262 F7.4 --- Conf Supercluster confidence estimate 268 I1 --- Edge [0/1] Mask boundary contact 274 I1 --- Comp [0/7] Number of splitting objects
Global notes: Note (G1): SDSS main sample group data is taken from Tago et al. (2010, Cat. J/A+A/514/A102) Note (G3): all luminosities are in SDSS r-band Note (G4): mean density value "mdens" is * for the main sample: mdens=1.526e-2*1010h-1Lsun(Mpc/h)^-3 * for the LRG sample: mdens=8.148e-4*1010h-1Lsun(Mpc/h)^-3 Note (G5): Galaxy IDs are from Tago et al. (2010, Cat. J/A+A/514/A102)
Acknowledgements: Lauri Juhan Liivamagi, wire(at)ut.ee
(End) Lauri Juhan Liivamagi [Tartu Obs.], Patricia Vannier [CDS] 03-Jan-2012
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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