2010MNRAS.406..197B

Query : 2010MNRAS.406..197B

2010MNRAS.406..197B - Mon. Not. R. Astron. Soc., 406, 197-207 (2010/July-3)

Radio galaxies in the Sloan Digital Sky Survey: spectral index-environment correlations.

BORNANCINI C.G., O'MILL A.L., GUROVICH S. and LAMBAS D.G.

Abstract (from CDS):

We analyse optical and radio properties of radio galaxies detected in the Sloan Digital Sky Survey. The sample of radio sources is selected from the catalogue of Kimball & Ivezi{cacute} with flux densities at 325, 1400 and 4850MHz, using Westerbork Northern Sky Survey, NRAO VLA Sky Survey and Green Bank 6 cm radio surveys and from flux measurements at 74MHz taken from Very Large Array Low-Frequency Sky Survey (Cohen et al. 2006). We study radio galaxy spectral properties using radio colour-colour diagrams and find that our sample follows a single power law from 74 to 4850MHz. The spectral index versus spectroscopic redshift relation is not significant for our sample of radio sources. We analyse a subsample of radio sources associated with clusters of galaxies identified from the maxBCG catalogue and find that about 40 per cent of radio sources with ultrasteep spectra (USS;, where) are associated with galaxy clusters or groups of galaxies. We construct a Hubble diagram of USS radio sources in the optical r band up to and compare our results with those for normal galaxies selected from different optical surveys and find that USS radio sources are around as luminous as the central galaxies in the maxBCG cluster sample and typically more than 4mag brighter than normal galaxies at.

We study correlations between spectral index, richness and luminosity of clusters associated with radio sources. We find that USS at low redshift are rare, most of them reside in regions of unusually high ambient density, such of those found in rich cluster of galaxies. Our results also suggest that clusters of galaxies associated with steeper than the average spectra have higher richness counts and are populated by luminous galaxies in comparison with those environments associated to radio sources with flatter than the average spectra. A plausible explanation for our results is that radio emission is more pressure confined in higher gas density environments such as those found in rich clusters of galaxies and as a consequence radio lobes in rich galaxy clusters will expand adiabatically and lose energy via synchrotron and inverse Compton losses, resulting in a steeper radio spectra.


Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): surveys - galaxies: high-redshift - radio continuum: galaxies - radio continuum: general

VizieR on-line data: <Available at CDS (J/MNRAS/406/197): table1.dat>

CDS comments: Clusters SDSS-C4-DR3 3247 et [EAD2007] 200 Arcs pas identifies

Simbad objects: 137

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Number of rows : 137
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 6C 072226+412913 BiC 07 25 57.1387605696 +41 23 06.612668628           ~ 19 1
2 [KMA2007] 111.48808+41.38519 ClG 07 25 57.14 +41 23 06.7           ~ 1 0
3 NVSS J075131+434935 rG 07 51 31.866 +43 49 29.69           ~ 3 0
4 NVSS J075332+385742 rG 07 53 32.5026264600 +38 57 51.745418784           ~ 10 0
5 NVSS J075457+381525 rG 07 54 57.6633321504 +38 15 23.183069364           ~ 2 0
6 NVSS J075949+353235 rG 07 59 49.428 +35 32 35.59           ~ 3 0
7 2MASXI J0810546+491103 BLL 08 10 54.5967522168 +49 11 03.822378000     17.00 13.5   ~ 25 0
8 [KMA2007] 122.72750+49.18436 ClG 08 10 54.60 +49 11 03.7           ~ 4 0
9 [KMA2007] 123.46125+39.54183 ClG 08 13 50.70 +39 32 30.6           ~ 4 0
10 NVSS J081349+393237 rG 08 13 50.7005939160 +39 32 30.631950708           ~ 8 1
11 4C 30.15 rG 08 20 32.349 +30 34 49.80     18.5     ~ 19 1
12 FIRST J082103.6+524435 rG 08 21 03.679 +52 44 35.54           ~ 3 0
13 Z 208-3 rG 08 26 00.5764302600 +40 58 52.031162136   15.4       ~ 31 1
14 LEDA 1877008 rG 08 38 23.2748538216 +29 45 21.483241740     16.45     ~ 11 0
15 Shk 182 GiG 08 38.5 +29 45           ~ 4 0
16 6C 084020+511548 LIN 08 43 59.1350726088 +51 05 24.981297037           ~ 29 1
17 [KMA2007] 131.65796+51.45436 ClG 08 46 37.91 +51 27 15.7           ~ 4 0
18 NVSS J084638+512716 rG 08 46 37.9151716992 +51 27 15.575305140           ~ 11 1
19 FIRST J085117.2+370429 rG 08 51 17.4086859912 +37 04 28.591154220           ~ 4 0
20 NVSS J085957+564714 rG 08 59 57.2742631872 +56 47 12.140132244           ~ 8 0
21 Z 264-47 LIN 09 00 20.2564349568 +52 29 39.268714632   13.7       ~ 56 0
22 ACO 733 ClG 09 01 28.69 +55 38 36.8           ~ 32 0
23 NVSS J090129+553921 rG 09 01 30.1423157040 +55 39 16.537059648           ~ 23 2
24 NVSS J090300+352703 rG 09 03 00.1296365328 +35 27 04.831635132           ~ 4 0
25 NVSS J090344+413819 rG 09 03 44.830 +41 38 20.68           ~ 7 2
26 [KMA2007] 135.93682+41.63908 ClG 09 03 44.84 +41 38 20.7           ~ 1 0
27 NVSS J093442+351413 rG 09 34 42.262 +35 14 16.83           ~ 1 0
28 7C 093433.70+371904.00 Sy2 09 37 37.1086073496 +37 05 35.390851764   21.27 20.56     ~ 9 1
29 FIRST J094309.2+295018 rG 09 43 09.3296201568 +29 50 18.757763736           ~ 7 0
30 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 141 0
31 2MASX J09524915+5153053 LIN 09 52 49.164 +51 53 05.04   20.1       ~ 31 1
32 NVSS J095529+602314 rG 09 55 29.882 +60 23 17.33           ~ 14 1
33 [KMA2007] 148.87452+60.38814 ClG 09 55 29.88 +60 23 17.3           ~ 4 0
34 BAX 150.1046+44.1539 ClG 10 00 17.91 +44 08 35.8           ~ 40 0
35 SDSS J100031.00+440843.3 rG 10 00 31.0050903624 +44 08 43.257761484   19.8       ~ 9 0
36 NVSS J100928+461740 rG 10 09 28.248 +46 17 37.26           ~ 3 0
37 Z 183-9 LIN 10 17 58.1796345840 +37 10 53.711570676   15.5       ~ 38 1
38 NVSS J102710+390806 rG 10 27 09.947 +39 08 05.05           ~ 11 1
39 [KI2008] 1080596 rG 10 28 54.681 +48 09 36.67           ~ 1 0
40 LEDA 2277132 rG 10 39 32.121 +46 12 05.37           ~ 11 0
41 NVSS J104625+593742 rG 10 46 25.51393 +59 37 36.3180           ~ 11 1
42 [KMA2007] 161.60635+59.62690 ClG 10 46 25.52 +59 37 36.8           ~ 4 0
43 NSCS J105005+322256 ClG 10 50 05.0 +32 22 56           ~ 1 0
44 FIRST J105010.0+322205 rG 10 50 09.9486646968 +32 22 05.048658048           ~ 6 0
45 NVSS J105819+410341 rG 10 58 19.4364510960 +41 03 41.045394204           ~ 13 0
46 NSC J105814+410353 ClG 10 58 19.44 +41 03 41.0           ~ 6 0
47 FIRST J110433.1+464225 rG 11 04 33.1061682600 +46 42 25.795210104           ~ 7 0
48 1RXS J110529.9+311441 Bla 11 05 30.660 +31 14 36.69           ~ 7 0
49 FIRST J111845.2+521600 rG 11 18 45.271 +52 16 00.36           ~ 6 0
50 NVSS J112323+475456 rG 11 23 22.9409454408 +47 55 13.743873516           ~ 1 0
51 ACO 1253 ClG 11 25 13.5 +42 29 15           ~ 10 0
52 NVSS J112516+422911 rG 11 25 16.4079095472 +42 29 12.285836952           ~ 13 1
53 FIRST J112718.4+530221 rG 11 27 18.478 +53 02 21.65           ~ 8 0
54 NVSS J112901+324549 rG 11 29 01.728 +32 45 50.32           ~ 3 1
55 7C 112841.60+335106.00 BLL 11 31 20.896 +33 34 47.09   17.50       ~ 15 1
56 ACO 1290 ClG 11 31 21.4 +33 34 47           ~ 19 0
57 SDSS J113457.35+534624.0 rG 11 34 57.3653417328 +53 46 23.989185300           ~ 4 0
58 NVSS J113526+315333 rG 11 35 26.69307 +31 53 32.4560           ~ 15 1
59 NVSS J113750+463634 rG 11 37 50.205 +46 36 33.76           ~ 9 1
60 4C 37.32 Sy2 11 44 27.1967501544 +37 08 31.907417676   17.5       ~ 67 1
61 NVSS J114712+381926 rG 11 47 12.366 +38 19 26.48           ~ 3 1
62 NVSS J115048+621954 rG 11 50 49.158 +62 19 48.08           ~ 11 1
63 NVSS J115158+314032 rG 11 51 58.629 +31 40 32.35           ~ 7 2
64 SDSS J115200.19+331342.1 rG 11 52 00.197 +33 13 42.10           ~ 9 0
65 MCXC J1152.5+3732 ClG 11 52 35.7 +37 32 46           ~ 8 0
66 NVSS J115236+373245 rG 11 52 36.456 +37 32 43.76           ~ 11 2
67 NVSS J115605+343307 rG 11 56 05.409 +34 33 04.22           ~ 10 1
68 NVSS J115848+571718 rG 11 58 48.2522938272 +57 17 19.040520228           ~ 9 2
69 NVSS J120647+515711 rG 12 06 47.878 +51 57 11.54           ~ 4 1
70 NVSS J120800+433920 rG 12 08 00.760 +43 39 19.36           ~ 12 1
71 2XMMi J120800.8+433917 ClG 12 08 00.76 +43 39 19.3           ~ 8 0
72 6C 120604+613809 BLL 12 08 37.1248042488 +61 21 06.362268084   19.49 18.49 16.8   ~ 47 1
73 NAME NGC 4135 Group GrG 12 09.0 +44 00           ~ 1 0
74 NGC 4135 Sy2 12 09 08.8089458664 +44 00 11.324839788   14.79 14.02     ~ 56 0
75 NVSS J121145+323837 rG 12 11 46.172 +32 38 37.94           ~ 3 1
76 FIRST J122802.1+344040 rG 12 28 02.163 +34 40 39.13           ~ 7 0
77 [KMA2007] 187.00902+34.67753 ClG 12 28 02.16 +34 40 39.1           ~ 4 0
78 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
79 NSC J124001+374544 ClG 12 40 01.42 +37 45 43.6           ~ 2 0
80 NVSS J124004+374415 rG 12 40 04.8532128007 +37 44 15.176988640           ~ 13 1
81 LEDA 2536513 rG 12 51 07.5061781520 +56 25 45.021256860           ~ 5 0
82 NVSS J130429+514319 rG 13 04 31.3650351768 +51 43 41.840713272           ~ 8 1
83 [KMA2007] 196.15441+51.71551 ClG 13 04 37.06 +51 42 55.8           ~ 1 0
84 [KMA2007] 196.55069+51.73530 ClG 13 06 12.17 +51 44 07.1           ~ 4 0
85 NVSS J130612+514407 rG 13 06 12.16920 +51 44 06.2480           ~ 16 1
86 NSC J131422+412404 ClG 13 14 18.26 +41 24 29.7           ~ 5 0
87 FIRST J131418.3+412430 rG 13 14 18.2664435576 +41 24 29.865419712           ~ 9 0
88 FIRST J131938.9+613911 rG 13 19 38.904 +61 39 10.51           ~ 7 0
89 FIRST J132412.3+311724 rG 13 24 12.2605569672 +31 17 23.505000972           ~ 7 0
90 NVSS J134033+401731 rG 13 40 32.8044376488 +40 17 39.738044976           ~ 12 0
91 NAME RX J1340.6+4018 Group ClG 13 40 33.5 +40 17 46           ~ 30 1
92 NVSS J134159+422133 rG 13 41 59.629 +42 21 32.82           ~ 1 0
93 2MASS J13490377+3052271 Sy2 13 49 03.7622076768 +30 52 27.177476016           ~ 6 0
94 SDSS J134927.92+462015.0 rG 13 49 27.924 +46 20 14.99           ~ 4 0
95 NVSS J140602+520953 rG 14 06 03.264 +52 09 52.23           ~ 4 0
96 2MASX J14183761+3746243 Sy1 14 18 37.6584749304 +37 46 24.529746288     14.50     ~ 18 0
97 ACO 1896 ClG 14 18 40 +37 47.2           ~ 6 0
98 SDSS J142056.84+531307.4 rG 14 20 56.8496693952 +53 13 07.606216344   20.532   19.675 18.900 ~ 9 0
99 SDSS J142110.21+420912.4 rG 14 21 10.2196931976 +42 09 12.474443772           ~ 5 0
100 NSCS J142115+420743 ClG 14 21 15.0 +42 07 43           ~ 1 0
101 NVSS J142841+434136 rG 14 28 41.2277852328 +43 41 34.290515256           ~ 8 0
102 NSCS J142842+434009 ClG 14 28 42.0 +43 40 09           ~ 1 0
103 FIRST J142857.6+543627 rG 14 28 57.648 +54 36 27.75           ~ 4 0
104 NSC J143143+463738 ClG 14 31 43.78 +46 37 38.2           ~ 2 0
105 LEDA 2284426 rG 14 32 04.0402689552 +46 37 43.698965340           ~ 7 0
106 2MASX J14360253+3307538 Sy1 14 36 02.5355113584 +33 07 53.685246972           ~ 15 1
107 FIRST J143619.4+483210 rG 14 36 19.4237512272 +48 32 10.536117720           ~ 5 0
108 NVSS J143742+392738 rG 14 37 42.3704300784 +39 27 43.320556188           ~ 6 1
109 [KMA2007] 219.42655+39.46313 ClG 14 37 42.37 +39 27 47.3           ~ 4 0
110 NVSS J144056+463647 rG 14 40 57.0500064096 +46 36 47.093045976           ~ 2 0
111 LEDA 2286190 rG 14 43 17.0613676200 +46 43 48.515200464           ~ 4 0
112 NVSS J145003+313014 rG 14 50 03.5416155984 +31 30 14.883601068           ~ 5 1
113 [KMA2007] 222.55394+31.49750 ClG 14 50 12.95 +31 29 51.0           ~ 5 0
114 FIRST J145031.5+325303 rG 14 50 31.5388510632 +32 53 03.915508668           ~ 7 0
115 NVSS J150323+460618 rG 15 03 23.627 +46 06 16.05           ~ 3 0
116 FIRST J150523.4+470625 rG 15 05 23.4422890872 +47 06 26.655611040           ~ 6 0
117 ACO 2024 ClG 15 05 29 +47 07.4           ~ 6 0
118 NVSS J150545+545407 rG 15 05 46.227 +54 54 01.25           ~ 8 1
119 NVSS J150608+600216 rG 15 06 08.363 +60 02 16.93           ~ 7 1
120 Z 221-45 LIN 15 15 05.5371887352 +43 09 02.103180444   15.2       ~ 27 1
121 [KMA2007] 234.96158+30.71777 ClG 15 39 50.78 +30 43 04.0           ~ 2 0
122 NVSS J153950+304306 rG 15 39 50.7824102760 +30 43 04.029586680   12.88   10.77   ~ 30 2
123 LEDA 3577501 rG 15 41 05.48712 +32 04 50.4660           ~ 6 0
124 NVSS J154146+455614 rG 15 41 46.5445347936 +45 56 14.364897468           ~ 10 1
125 NVSS J155051+420233 rG 15 50 51.5047771104 +42 02 32.169753204           ~ 10 0
126 FIRST J155241.1+372434 rG 15 52 41.1271 +37 24 34.022           ~ 5 1
127 NVSS J155423+484104 rG 15 54 23.5547089872 +48 41 05.844749460           ~ 7 0
128 [KMA2007] 238.59817+48.68496 ClG 15 54 23.56 +48 41 05.9           ~ 1 0
129 NVSS J160725+475025 rG 16 07 25.446 +47 50 23.82           ~ 5 1
130 ACO 2157 ClG 16 07 28 +47 51.1           ~ 6 0
131 [KMA2007] 248.29532+36.12611 ClG 16 33 10.88 +36 07 34.0           ~ 5 0
132 NVSS J163310+360734 rG 16 33 10.8770583768 +36 07 34.098227508           ~ 13 1
133 NVSS J164326+393038 rG 16 43 26.924 +39 30 39.47           ~ 5 0
134 4C 32.52A rG 16 59 00.9991142520 +32 29 39.282767376   16.55       ~ 51 1
135 ACO 2241 ClG 16 59 42.58 +32 34 44.4           ~ 85 1
136 NVSS J170426+391010 rG 17 04 26.5380651192 +39 10 11.520776892           ~ 5 0
137 NSC J170432+390956 ClG 17 04 32.64 +39 09 56.4           ~ 2 0

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