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 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:
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FileName Lrecl Records Explanations
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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
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See also:
J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010)
Byte-by-byte Description of file: main50.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: mainadap.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: lrg44.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: lrgadap.dat
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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
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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)
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Acknowledgements:
Lauri Juhan Liivamagi, wire(at)ut.ee
(End) Lauri Juhan Liivamagi [Tartu Obs.], Patricia Vannier [CDS] 03-Jan-2012