2003MNRAS.344..283B

Query : 2003MNRAS.344..283B

2003MNRAS.344..283B - Mon. Not. R. Astron. Soc., 344, 283-306 (2003/September-1)

Two 100-Mpc-scale structures in the three-dimensional distribution of radio galaxies and their implications.

BRAND K., RAWLINGS S., HILL G.J., LACY M., MITCHELL E. and TUFTS J.

Abstract (from CDS):

We present unequivocal evidence for a huge (~80x100x100Mpc3) superstructure at redshift z = 0.27 in the three-dimensional distribution of radio galaxies from the Texas-Oxford NVSS Structure 08h region (TONS08) sample, confirming tentative evidence for such a structure from the 7C redshift survey (7CRS). A second, newly discovered superstructure is also found less securely at redshift 0.35 (of dimensions ~100x100x100 Mpc3). We present full observational details on the TONS08 sample which was constructed to probe structures in the redshift range 0 ≲z ≲ 0.5 by matching NVSS sources with objects in APM catalogues to obtain a sample of optically bright (E ~R ≤ 19.83), radio-faint (1.4-GHz flux density S1.4≥ 3 mJy) radio galaxies in the same 25 deg2 area as part II of the 7CRS. Out of the total sample size of 84 radio galaxies, at least 25 are associated with the two ~100 Mpc-scale superstructures. We use quasi-linear structure formation theory to estimate the number of such structures expected in the TONS08 volume if the canonical value for radio galaxy bias is assumed. Under this assumption, the structures represent ~4-5σ peaks in the primordial density field and their expected number is low (∼10–2-10–4). Because the TONS08 survey was designed to follow up a previously, if tentatively, identified superstructure in the 7CRS, the probability of finding two superstructures in TONS08 is uncertain but, assuming that the tentative detection of the z = 0.35 superstructure is real, must lie between ∼10–4 and ∼10–5, depending on how representative the TONS08 region proves to be. We show that similar structures (with similarly low probabilities) are also found in previous radio galaxy redshift surveys, but their significance has not been fully appreciated because they have been traced by very small numbers of radio galaxies. Fortunately, there are several plausible explanations (many of which are testable) for these low probabilities in the form of potential mechanisms for boosting the bias on large scales. These include the association of radio galaxies with highly biased rich clusters in superstructures, enhanced triggering by group-group mergers and enhanced triggering and/or redshift space distortion in collapsing systems as the growth of superstructures moves into the non-linear regime.

Abstract Copyright: 2003 RAS

Journal keyword(s): galaxies: active - cosmology: observations - large-scale structure of Universe - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/344/283): table2.dat>

Nomenclature: Table 2: TONS 08 NNNN N=82 among (Nos 15-1140).

Simbad objects: 83

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Number of rows : 83
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TONS 08 15 rG 08 10 32.75 +28 20 34.5           ~ 1 0
2 TONS 08 21 rG 08 10 37.05 +29 12 50.7           ~ 1 0
3 NVSS J081058+275103 rG 08 10 57.8260023816 +27 51 02.008962036           ~ 3 0
4 [MML2015] 5BZG J0810+2846 BLL 08 10 58.1886136584 +28 46 18.553791216   21.03 20.18 19.7   ~ 11 0
5 NVSS J081111+284753 rG 08 11 11.5183710877 +28 47 50.443383318           ~ 10 1
6 TONS 08 58 rG 08 11 14.39 +26 02 16.9           ~ 1 0
7 5C 7.9 Sy2 08 11 18.085 +24 49 35.41   20.22 19.29     ~ 14 0
8 TONS 08 64 rG 08 11 19.07 +25 29 55.3           ~ 1 0
9 FIRST J081147.1+271616 rG 08 11 47.1182682048 +27 16 16.528601136           ~ 6 0
10 NVSS J081243+250243 rG 08 12 43.7718269904 +25 02 47.238365940           ~ 9 1
11 NVSS J081248+262636 rG 08 12 48.748 +26 26 37.68           ~ 2 0
12 NVSS J081255+270855 rG 08 12 55.489 +27 08 55.60           ~ 2 0
13 TONS 08 178 rG 08 13 20.523 +28 21 50.32           ~ 2 0
14 2MASX J08133428+2723596 BiC 08 13 34.3100888136 +27 23 59.455226544           ~ 5 0
15 NVSS J081343+265509 rG 08 13 43.647 +26 55 10.67           ~ 7 1
16 TONS 08 229 rG 08 13 59.59 +24 20 41.6           ~ 1 0
17 FIRST J081428.6+284736 rG 08 14 28.6134207648 +28 47 37.397662800           ~ 2 0
18 FIRST J081429.9+284750 rG 08 14 29.9611451184 +28 47 50.062310376           ~ 6 0
19 NVSS J081433+272258 rG 08 14 33.0569747808 +27 22 57.674861580           ~ 9 1
20 TONS 08 259 rG 08 14 34.95 +24 27 43.2           ~ 1 0
21 2MASX J08143615+2412303 rG 08 14 36.1530866688 +24 12 30.870488124           ~ 1 0
22 NVSS J081445+261550 rG 08 14 46.0317777744 +26 15 49.176664236           ~ 6 0
23 7C 0811+2838 rG 08 14 53.40 +28 29 40.5           ~ 1 0
24 TONS 08 288 rG 08 14 57.86 +25 03 42.0           ~ 1 0
25 TONS 08 300 rG 08 15 10.90 +24 27 54.1           ~ 1 0
26 TONS 08 302 rG 08 15 12.19 +28 08 20.3           ~ 1 0
27 NVSS J081545+244956 rG 08 15 45.7872599088 +24 49 57.221602752           ~ 2 0
28 NVSS J081547+273147 rG 08 15 47.1699159744 +27 31 46.870091400           ~ 3 1
29 TONS 08 340 rG 08 15 49.27 +28 01 55.5           ~ 1 0
30 TONS 08 348 rG 08 16 01.04 +28 32 10.2           ~ 1 0
31 TONS 08 355 rG 08 16 07.85 +28 08 53.0           ~ 1 0
32 TONS 08 385 rG 08 16 42.31 +28 21 17.4           ~ 1 0
33 NVSS J081645+253644 rG 08 16 45.374 +25 36 45.24           ~ 2 0
34 TONS 08 403 rG 08 16 51.65 +28 22 24.3           ~ 1 0
35 TONS 08 422 rG 08 17 09.28 +25 07 59.6           ~ 1 0
36 NVSS J081724+275606 rG 08 17 24.3662726448 +27 56 08.595061980           ~ 5 0
37 NVSS J081728+260244 rG 08 17 28.9762975896 +26 02 46.614511032           ~ 2 0
38 NVSS J081754+285706 rG 08 17 54.5922389256 +28 57 05.826601800           ~ 4 0
39 NVSS J081811+264248 rG 08 18 11.279 +26 42 48.33           ~ 2 0
40 TONS 08 492 rG 08 18 18.33 +28 09 30.5           ~ 1 0
41 NVSS J081852+262354 rG 08 18 52.4460990792 +26 23 54.022474500           ~ 15 1
42 SDSS J081855.50+291527.7 Sy1 08 18 55.5039418392 +29 15 27.637284420   18.41 17.68     ~ 6 0
43 NVSS J081908+275355 rG 08 19 08.2780449576 +27 53 59.556238440           ~ 3 0
44 IRAS 08162+2717 Sy2 08 19 16.80984 +27 07 33.4128           ~ 24 1
45 NVSS J081921+242818 rG 08 19 21.6792715597 +24 28 18.886802222           ~ 2 1
46 NVSS J081943+290814 rG 08 19 42.7986094632 +29 08 14.327899548           ~ 4 0
47 NVSS J081943+251657 rG 08 19 43.6320143352 +25 16 57.552827916           ~ 3 0
48 NVSS J081951+243232 rG 08 19 51.1187631672 +24 32 31.465348872           ~ 4 0
49 TONS 08 607 rG 08 20 11.99 +27 18 26.5           ~ 1 0
50 TONS 08 619 rG 08 20 25.77 +27 49 54.2           ~ 1 0
51 TONS 08 624 rG 08 20 34.01 +27 53 52.1           ~ 1 0
52 TONS 08 626 rG 08 20 36.62 +27 49 59.3           ~ 1 0
53 TONS 08 647 rG 08 21 00.04 +26 17 20.6           ~ 1 0
54 NVSS J082103+284340 rG 08 21 03.819 +28 43 42.50           ~ 2 0
55 NVSS J082121+251903 rG 08 21 21.2688595440 +25 19 03.075175632           ~ 19 1
56 NVSS J082225+291126 rG 08 22 25.8404248416 +29 11 29.213902500           ~ 10 0
57 TONS 08 762 rG 08 22 53.37 +26 56 39.9           ~ 1 0
58 [YHW2016] 125.73946+25.35254 BiC 08 22 57.470 +25 21 09.13           ~ 3 0
59 TONS 08 792 rG 08 23 30.29 +25 01 33.0           ~ 1 0
60 NVSS J082337+280429 rG 08 23 36.981 +28 04 39.00           ~ 5 1
61 NVSS J082345+272504 rG 08 23 45.807 +27 25 02.84           ~ 4 0
62 NVSS J082421+260915 rG 08 24 21.9037665048 +26 09 16.627900680           ~ 4 1
63 NVSS J082425+243434 rG 08 24 25.1346168384 +24 34 27.966941004           ~ 3 0
64 NVSS J082435+281933 rG 08 24 35.5212722712 +28 19 32.849157092           ~ 9 0
65 NVSS J082435+253323 rG 08 24 35.5857783576 +25 33 27.128514816           ~ 5 0
66 NVSS J082439+271348 rG 08 24 39.82874 +27 13 45.6905           ~ 2 0
67 NVSS J082519+261808 rG 08 25 19.2916106160 +26 18 13.363330680           ~ 6 0
68 FIRST J082521.0+271332 rG 08 25 21.1099982808 +27 13 32.422562184           ~ 7 0
69 TONS 08 942 rG 08 25 43.13 +27 35 26.8           ~ 1 0
70 NVSS J082554+270457 rG 08 25 54.7556659032 +27 04 56.525573712           ~ 5 1
71 TONS 08 989 rG 08 26 37.06 +26 22 58.9           ~ 1 0
72 TONS 08 1020 rG 08 27 07.90 +28 10 22.1           ~ 1 0
73 3C 200 rG 08 27 25.38019 +29 18 44.9601   20       ~ 178 1
74 FIRST J082739.5+290236 rG 08 27 39.5797517904 +29 02 35.703575686           ~ 1 0
75 NVSS J082745+261938 rG 08 27 45.700 +26 19 36.01           ~ 2 0
76 TONS 08 1053 rG 08 27 49.93 +28 45 18.2           ~ 1 0
77 TONS 08 1077 rG 08 28 18.54 +27 47 02.1           ~ 1 0
78 NVSS J082836+242036 rG 08 28 36.0142506960 +24 20 37.345348788           ~ 4 0
79 NVSS J082842+243011 rG 08 28 42.17 +24 30 11.7           ~ 2 0
80 NVSS J082845+291721 rG 08 28 45.7340340912 +29 17 18.756260736           ~ 1 0
81 TONS 08 1121 rG 08 28 48.80 +24 42 39.6           ~ 1 0
82 7C 0826+2445 rG 08 28 56.07 +24 33 25.3           ~ 1 0
83 NVSS J082911+260001 rG 08 29 11.481 +26 00 03.32           ~ 5 0

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