Source Distribution Statistics:

The XSC contains over 1.5 million galaxies, extending down to J=15.3 mag and K = 14.1 mag for S/N > 7 in any given band. Most XSC galaxies are faint and small (higher redshift), rendering photometric redshifts unreliable for S/N < 10. Consequently, the XSCz is K-band limited to K=14th mag to improve reliability of the photometric redshifts at the faint end. With this cut, the sample is ~1 million galaxies, of which over 300,000 have radial velocities or other well determined distances. Most of the redshifts come from the ZCAT (Huchra), 6dFGS and the SDSS; tabulated below.

redshift range total number of sources photometric
redshifts (%total) photo(z) unc. radial velocity
redshifts distance range
(Mpc) volume
(Mpc^3) number per volume
(100 per Mpc^3)

<0.10 758,853 495,334 ( 65%) - 263,519 (35%) 0.0 - 388 2.443e08 0.311
0.00 to 0.0012 155 0 ( 0%) - 155 (100%) 0.0 - 5.0 522.19 29.68
0.0012 to 0.0024 193 2 ( 1%) 30 (%) 191 (99%) 5.0 - 10.0 3644.07 5.30
0.0024 to 0.0048 1439 9 ( 1%) 30 (%) 1430 (99%) 10.0 - 20.0 28,984.89 4.96
0.0048 to 0.01 3908 110 ( 3%) 30 (%) 3798 (97%) 20.0 - 41.0 263,146 1.49

0.01 to 0.02 17,841 1459 (8%) 34.6 (%) 16,382 (91%) 41.0 - 82.0 2.022e06 0.88

0.02 to 0.03 32,669 6255 (19%) 31.8 (%) 26,414 (81%) 81.0 - 122.0 5.336E+06 0.61

0.03 to 0.04 54,197 21,031 (39%) 26.7 (%) 33,166 (61%) 122.0 - 162.0 1.010E+07 0.54

0.04 to 0.05 72,231 40,059 (55%) 36.8 (%) 32,172 (44.5%) 162.0 - 201.0 1.618E+07 0.45

0.05 to 0.06 100,263 64,911 (65%) 34.8 (%) 35,352 (35%) 201 - 239 2.346E+07 0.43

0.06 to 0.07 119,707 84,856 (71%) 29.6 (%) 34,851 (29%) 239 - 277 3.183E+07 0.38

0.07 to 0.08 129,655 97,485 (75%) 25.8 (%) 32,170 (25%) 277 - 315 4.118E+07 0.31

0.08 to 0.09 122,567 95,386 (78%) 31.4 (%) 27,181 (22%) 315 - 351 5.143E+07 0.24

0.09 to 0.10 104,028 83,771 (81%) 34.3 (%) 20,257(19%) 381 - 388 6.248E+07 0.17

0.10 to 0.12 155,650 122,308 (79%) 33.7 (%) 33,342 (21%) 388 - 459 1.609E+08 0.10

0.12 to 0.14 85,541 62,450 (73%) 31.5 (%) 23,091 (27%) 459 - 528 2.129E+08 0.04

0.14 to 0.16 39,642 24,501 (62%) 29.0 (%) 15,141 (38%) 528 - 596 2.688E+08 0.02

0.16 to 0.18 16,749 7,673 (46%) 32.1 (%) 9,076 (54%) 596 - 662 3.276E+08 0.01

0.18 to 0.20 7,749 1,675 (21%) 21.8 (%) 6,074 (78%) 662 - 726 3.888E+08 0.00

back to LSS page

redshift range	total number of sources	photometric redshifts (%total)	photo(z) unc.	radial velocity redshifts	distance range (Mpc)	volume (Mpc^3)	number per volume (100 per Mpc^3)
<0.10	758,853	495,334 ( 65%)	-	263,519 (35%)	0.0 - 388	2.443e08	0.311
0.00 to 0.0012	155	0 ( 0%)	-	155 (100%)	0.0 - 5.0	522.19	29.68
0.0012 to 0.0024	193	2 ( 1%)	30 (%)	191 (99%)	5.0 - 10.0	3644.07	5.30
0.0024 to 0.0048	1439	9 ( 1%)	30 (%)	1430 (99%)	10.0 - 20.0	28,984.89	4.96
0.0048 to 0.01	3908	110 ( 3%)	30 (%)	3798 (97%)	20.0 - 41.0	263,146	1.49
0.01 to 0.02	17,841	1459 (8%)	34.6 (%)	16,382 (91%)	41.0 - 82.0	2.022e06	0.88
0.02 to 0.03	32,669	6255 (19%)	31.8 (%)	26,414 (81%)	81.0 - 122.0	5.336E+06	0.61
0.03 to 0.04	54,197	21,031 (39%)	26.7 (%)	33,166 (61%)	122.0 - 162.0	1.010E+07	0.54
0.04 to 0.05	72,231	40,059 (55%)	36.8 (%)	32,172 (44.5%)	162.0 - 201.0	1.618E+07	0.45
0.05 to 0.06	100,263	64,911 (65%)	34.8 (%)	35,352 (35%)	201 - 239	2.346E+07	0.43
0.06 to 0.07	119,707	84,856 (71%)	29.6 (%)	34,851 (29%)	239 - 277	3.183E+07	0.38
0.07 to 0.08	129,655	97,485 (75%)	25.8 (%)	32,170 (25%)	277 - 315	4.118E+07	0.31
0.08 to 0.09	122,567	95,386 (78%)	31.4 (%)	27,181 (22%)	315 - 351	5.143E+07	0.24
0.09 to 0.10	104,028	83,771 (81%)	34.3 (%)	20,257(19%)	381 - 388	6.248E+07	0.17
0.10 to 0.12	155,650	122,308 (79%)	33.7 (%)	33,342 (21%)	388 - 459	1.609E+08	0.10
0.12 to 0.14	85,541	62,450 (73%)	31.5 (%)	23,091 (27%)	459 - 528	2.129E+08	0.04
0.14 to 0.16	39,642	24,501 (62%)	29.0 (%)	15,141 (38%)	528 - 596	2.688E+08	0.02
0.16 to 0.18	16,749	7,673 (46%)	32.1 (%)	9,076 (54%)	596 - 662	3.276E+08	0.01
0.18 to 0.20	7,749	1,675 (21%)	21.8 (%)	6,074 (78%)	662 - 726	3.888E+08	0.00