2007A&A...461...59L

Query : 2007A&A...461...59L

2007A&A...461...59L - Astronomy and Astrophysics, volume 46159-69 (2007/1-1)

First tentative detection of anisotropy in the QSO distribution around nearby edge-on spiral galaxies.

LOPEZ-CORREDOIRA M. and GUTIERREZ C.M.

Abstract (from CDS):

To check whether the polar angle distribution of QSOs around nearby spiral galaxies is isotropic or not. A statistical analysis of the polar angle distribution of large samples of QSOs from the SDSS survey and Monte Carlo simulations to calculate their significance are carried out. There is a clear excess of QSOs near the minor axis with respect to the major axis of nearby edge-on spiral galaxies, significant at a level 3.5σ up to angular distances of ∼ 3° (or ∼1.7 Mpc) from the centre of each galaxy. The significance is increased to 3.9σ with the z>0.5 QSOs, and it reaches 4.8σ if we include galaxies whose circles of radius 3 degrees are covered by the SDSS in more than 98% (instead of 100%) of the area. Gravitational lensing in the halo of nearby galaxies or extinction seem insufficient to explain the observed anisotropic distribution of QSOs. The anisotropic distribution agrees qualitatively with the predictions of Arp's models, which claim that QSOs are ejected by galaxies along the rotation axis, although Arp's prediction give a distance of the QSOs ∼3 times smaller than that found here. In any case, a chance fluctuation, although highly improbable, might be a possibility rather than a true anisotropy, and the present results should be corroborated by other groups and samples, so we prefer to consider it as just a first tentative detection.

Abstract Copyright: ∼

Journal keyword(s): quasars: general - galaxies: statistics - catalogs - distance scale - gravitational lensing

CDS comments: Table 2: numbering NN not used in SIMBAD, all objects are PGC NNNNN.

Simbad objects: 79

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Number of rows : 79
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 ICRF J011818.4+025805 Sy1 01 18 18.4816422984 +02 58 05.790609192     17.5     ~ 142 1
2 NGC 470 GiP 01 19 44.8526263032 +03 24 36.027176544 12.63 12.53 11.78     ~ 287 1
3 NGC 474 GiP 01 20 06.6870520512 +03 24 55.861973100 12.75 12.37 11.51 11.42 10.56 ~ 371 1
4 3C 39 Sy1 01 21 01.2 +03 44 14   18.3 18.09 18.7   ~ 91 1
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
6 NGC 2638 LIN 08 42 25.7663734872 +37 13 15.863193120   13.7       ~ 47 0
7 Z 209-15 GiP 08 59 00.28 +39 12 35.7   15.00       ~ 69 1
8 Z 264-70 AG? 09 09 19.4439464928 +54 54 42.701639508   14.64       ~ 50 1
9 Z 264-78 LSB 09 11 33.574 +51 15 15.46   14.5       ~ 60 0
10 NGC 2798 GiG 09 17 22.95407 +41 59 58.9560 13.03 13.04 12.32     ~ 338 3
11 APG 283 PaG 09 17 26.99 +41 59 48.8   12.2       ~ 193 1
12 NGC 2799 GiP 09 17 31.0045889856 +41 59 38.595688980   14.32 13.71     ~ 130 1
13 Z 264-91 Sy2 09 17 39.9272205288 +52 59 34.398825756   16.68 15.97     ~ 70 0
14 Z 264-98 AG? 09 19 34.6821040152 +51 06 29.209654584   15.4       ~ 26 0
15 Z 238-45 AG? 09 23 03.080 +44 33 17.56   14.0       ~ 59 0
16 NGC 2854 GiG 09 24 03.15673 +49 12 15.6710   13.82       ~ 109 2
17 APG 285 GrG 09 24.1 +49 13           ~ 55 0
18 NGC 2870 AG? 09 27 53.7173396328 +57 22 31.401653520   13.83       ~ 73 1
19 Z 35-9 AG? 09 35 07.475 +05 07 12.24   14.50       ~ 54 1
20 NGC 2966 GiP 09 42 11.5147585416 +04 40 23.485202148   14.0       ~ 121 0
21 Z 7-31 GiG 09 46 03.651 +01 40 05.96   13.6   13.4 13.3 ~ 83 0
22 IC 564 GiG 09 46 21.0998750808 +03 04 17.078546964   14.1       ~ 105 1
23 Z 35-58 AG? 09 47 45.381 +02 37 38.93   14.4       ~ 76 0
24 Z 36-8 AG? 09 57 16.525 +04 31 37.06   15.0       ~ 57 0
25 Z 36-14 AG? 10 00 27.0526712088 +03 22 27.627340368   14.5       ~ 87 1
26 Z 37-14 Sy2 10 22 24.4136490480 +03 59 50.307151704   14.2       ~ 65 0
27 Z 37-49 AG? 10 29 15.503 +06 07 41.17   14.9       ~ 57 0
28 Z 37-61 GiP 10 31 13.307 +04 28 20.08   14.60       ~ 73 0
29 Z 266-59 G 10 34 15.1507854984 +52 52 14.969638560   14.0       ~ 26 0
30 Z 37-97 AG? 10 38 07.0930928472 +04 53 39.538644108   15.0       ~ 44 0
31 NGC 3365 GiG 10 46 12.649 +01 48 47.95   13.0   13.0 12.9 ~ 107 0
32 NGC 3398 AG? 10 51 31.4419761504 +55 23 27.506610456   14.4       ~ 47 0
33 Z 38-32 GiG 10 51 35.311 +04 34 58.41   14.00       ~ 49 1
34 NGC 3440 AGN 10 53 49.508 +57 07 07.52   14.02       ~ 89 1
35 NGC 3495 GiG 11 01 16.168 +03 37 40.93   13.10       ~ 160 0
36 NGC 3530 GiG 11 08 40.3857756096 +57 13 48.553797288   14.4       ~ 57 0
37 NGC 3549 LIN 11 10 56.8841970408 +53 23 15.914963364   12.8       ~ 104 0
38 M 108 AGN 11 11 30.967 +55 40 26.84   10.70       ~ 497 1
39 Z 268-28 AG? 11 23 23.2200537264 +50 53 33.503083728   14.9       ~ 116 0
40 Z 39-168 G 11 24 25.591 +03 08 41.95   15.6       ~ 20 0
41 NGC 3683 H2G 11 27 31.890 +56 52 36.15   12.7       ~ 197 0
42 Z 314-32 AG? 11 33 20.7550171368 +63 16 48.863757072   13.3       ~ 61 0
43 Z 292-9 GiP 11 36 26.47296 +58 11 28.9572   14.3       ~ 97 1
44 IC 716 SyG 11 39 03.3319755216 -00 12 21.732857604   14.80       ~ 77 2
45 NGC 3795 GiG 11 40 06.841 +58 36 47.37   14.1       ~ 91 0
46 Z 41-31 GiG 12 03 40.1000194680 +02 38 28.429430352   14.6       ~ 68 0
47 Z 13-52 GiG 12 03 44.6379674040 +01 41 42.250972848   15.008   13.793   ~ 40 0
48 Z 13-57 GiG 12 04 20.0043502224 +01 34 03.461042496   14.6       ~ 47 0
49 Z 14-12 LSB 12 20 33.760 +00 47 17.01   15.0       ~ 64 0
50 NGC 4437 AGN 12 32 45.586 +00 06 54.14   11.1   11.1 10.6 ~ 307 0
51 Z 14-86 AG? 12 38 35.91956 +01 24 08.2536   15.2   14.381   ~ 52 0
52 NGC 4592 EmG 12 39 18.7543040040 -00 31 55.529665824   12.4   12.3 12.1 ~ 159 0
53 NGC 4632 EmG 12 42 31.9886669016 -00 04 57.071456184   12.5   12.4 11.9 ~ 177 0
54 NGC 4642 GiP 12 43 17.783 -00 38 39.29   13.8       ~ 82 0
55 NGC 4669 GiG 12 44 46.7728292184 +54 52 32.629346652   15.1       ~ 34 0
56 NGC 4666 AGN 12 45 08.676 -00 27 42.88   11.7   11.5 10.7 ~ 421 1
57 NGC 4675 GiG 12 45 31.91520 +54 44 15.1910   15.4       ~ 66 1
58 NGC 4686 Sy2 12 46 39.8877786744 +54 32 03.290128944   13.7       ~ 87 0
59 Z 43-40 GiG 12 49 50.1988897848 +02 51 10.636698780   14.03       ~ 98 1
60 NGC 4771 EmG 12 53 21.273 +01 16 09.02   12.92   12.4 12.2 ~ 136 1
61 NGC 4845 Sy2 12 58 01.24153 +01 34 32.0880   17.40 16.31     ~ 259 1
62 Z 44-23 AG? 13 12 08.54 +02 59 17.9   15.6       ~ 20 0
63 NGC 5109 LSB 13 20 52.343 +57 38 41.05   13.6       ~ 56 0
64 NGC 5104 AGN 13 21 23.11513 +00 20 33.3820   14.5   13.227   ~ 169 1
65 Z 294-59 GiG 13 42 15.916 +60 46 36.39   14.5       ~ 68 0
66 NGC 5389 GiG 13 56 06.2870964720 +59 44 31.363711692   13.2       ~ 81 0
67 NGC 5402 AGN 13 58 16.542 +59 48 52.43   14.6       ~ 56 0
68 Z 46-27 G 13 58 44.704 +02 27 24.58   15.6       ~ 39 0
69 Z 295-34 AG? 14 03 20.332 +60 59 24.82   15.6       ~ 51 0
70 Z 19-43 LIN 14 29 10.6467967824 +02 17 13.224715260   15.2       ~ 36 0
71 NGC 5707 GiP 14 37 30.7766689296 +51 33 42.558357240   13.3       ~ 85 0
72 NGC 5719 GiG 14 40 56.3690411016 -00 19 05.854225080   13.10   12.061   ~ 187 2
73 Z 20-3 GiG 14 42 46.943 +00 39 42.24   15.2   15.0 15.1 ~ 63 0
74 NGC 5746 GiP 14 44 56.005 +01 57 17.06   12.3       ~ 375 0
75 NGC 5777 GiP 14 51 17.798 +58 58 40.12   14.2       ~ 104 0
76 Z 20-48 GiG 15 02 03.534 +01 50 28.01   14.61   12.93   ~ 65 1
77 NGC 5985 SyG 15 39 37.0545742176 +59 19 55.216886664   15.24 14.22     ~ 267 0
78 Z 223-48 LIN 16 10 43.8145029432 +41 08 54.784951116   15.3       ~ 51 0
79 Z 224-1 LIN 16 20 53.8167834288 +40 06 14.896517148   15.2       ~ 41 0

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