2008A&A...484..655F

Query : 2008A&A...484..655F

2008A&A...484..655F - Astronomy and Astrophysics, volume 484, 655-670 (2008/6-4)

Nuclear activity in galaxy pairs: a spectroscopic analysis of 48 UZC-BGPs.

FOCARDI P., ZITELLI V. and MARINONI S.

Abstract (from CDS):

The role played by interaction on galaxy formation and evolution continues to be debated. Several questions remain open, among them whether, and to what extent, galaxy interaction induce nuclear activity, as theoretical predictions, so far, have not been adequately supported by observations. Part of the uncertainty affecting the observational results is likely to be due to the limited sizes and the inhomogeneity of the samples. Galaxy pairs are ideal sites in which to investigate the role of interaction on nuclear activity, since the proximity, in redshift and in projected separation, between members make interaction and encounters highly probable. For this reason we have undertaken a spectroscopic survey of a large homogeneous sample of galaxy pairs (UZC-BGP) selected applying an objective neighbour search algorithm to a 3D galaxy catalog (UZC). We present the results of the nuclear spectral classification, performed using standard diagnostic diagrams, of 48 UZC-BGPs, which represents more than half of the whole sample and has an excellent morphological match with it. The fraction of emission line galaxies in our pair sample is large, especially among spirals where it reaches 84% and 95%, for early and late spirals. Star Burst (SB) is the most frequent type of nuclear activity encountered (30% of galaxies), while AGNs (Active Galactic Nuclei) make only 19%. The fractions increase to 45% and 22% when considering only spirals. Late spirals are characterized by both an unusual increase (35%) of AGN activity and high luminosity (44% have MB←20.0+5logh). LLAGNs (Low Luminosity AGNs) are only 8% of the total number of galaxies, but this kind of activity could be present in another 10% of the galaxies (LLAGN candidates). If confirmed, these candidates would make LLAGNs constitute a significant fraction of the whole AGN (LLAGN + AGN) population, and raise the AGN population as a whole to 37%. Absorption line galaxies reside mostly (61%) in S0 galaxies and display the lowest B luminosity in the sample; only 18% of them have MB←20+5logh, but together with LLAGNs (candidates included) they are the most massive galaxies in the sample. Intense-SB nuclei are found in galaxy pairs with galaxy-galaxy projected separation of up to 160h–1kpc suggesting that in bright isolated galaxy pairs interaction may be at work and effective up to that distance. AGNs are characterized by an advanced morphological type while the SB phenomenon occurs with the same frequency in early and late spirals. Whether and how these unusual characteristics relate to the pair environment needs to be further investigated. LLAGNs and LLAGN candidates do not always show similar properties; the former are more luminous in B, richer in early-type (E-S0s) galaxies, and half of them are hosted in galaxies showing visible signs of interaction with fainter companions. This last finding suggests that minor interactions might be a driving mechanism for a fraction of LLAGNs. The differences between LLAGNs and LLAGN candidates might confirm the heterogeneous nature of this class of objects.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: interactions

Simbad objects: 102

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Number of rows : 102
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 23 AG? 00 09 53.411 +25 55 25.46   12.5       ~ 313 3
2 NGC 26 GiP 00 10 25.8802950840 +25 49 54.906561264   13.9       ~ 87 2
3 NGC 41 GiG 00 12 47.9624045976 +22 01 24.536797284   14.6       ~ 38 0
4 NGC 42 GiG 00 12 56.3423596248 +22 06 01.018094292   15.0       ~ 19 0
5 NGC 160 AG? 00 36 04.0982272704 +23 57 28.502827092   13.7       ~ 94 0
6 NGC 169 SyG 00 36 51.6072915048 +23 59 27.553231968   13.70 13.1     ~ 117 0
7 IC 1559 AGN 00 36 52.33 +23 59 05.9   14       ~ 24 0
8 NGC 192 rG 00 39 13.4 +00 51 51   13.9   11.97   ~ 135 0
9 NGC 196 GiG 00 39 17.8424526792 +00 54 45.971984916   14.2   12.40   ~ 83 0
10 NGC 197 GiP 00 39 18.7935711480 +00 53 31.087552704   14.85   13.39   ~ 58 0
11 NGC 800 GiP 02 02 11.8416577848 -00 07 49.501608132   14.7       ~ 40 0
12 NGC 799 LIN 02 02 12.3388058520 -00 06 02.270888460   14.2       ~ 66 0
13 NGC 871 GiG 02 17 10.734 +14 32 52.10   14.20 13.61     ~ 69 1
14 NGC 876 GiG 02 17 53.327 +14 31 17.91   16.5       ~ 64 0
15 NGC 877 LSB 02 17 59.6453041536 +14 32 38.215857696   12.5       ~ 177 1
16 NGC 997 GiG 02 37 14.4815514120 +07 18 20.459367972   14.6       ~ 28 0
17 NGC 998 GiG 02 37 16.5088770312 +07 20 08.716710732   14.6       ~ 15 0
18 Mrk 1076 GiP 03 19 43.0391224711 +00 33 55.729212645   15.6       ~ 45 0
19 MCG+00-09-058 LIN 03 19 47.0201638968 +00 35 04.448132736   14.9       ~ 35 0
20 NGC 1587 GiP 04 30 39.9359019384 +00 39 41.922470340   13.3       ~ 141 0
21 NGC 1588 GiP 04 30 43.77 +00 39 53.0   14.1       ~ 83 0
22 NGC 1589 GiG 04 30 45.4373863872 +00 51 49.218145884   13.8       ~ 66 0
23 UGC 4074 GiG 07 54 18.3702893976 +54 15 19.580984676   13.8       ~ 21 0
24 MCG+09-13-088 G 07 54 53.9954136840 +54 07 13.452881412   15.1       ~ 8 0
25 NGC 2528 rG 08 07 24.8338213056 +39 11 40.167655476   13.5       ~ 45 0
26 NGC 2524 LIN 08 08 09.5922809136 +39 09 26.748482832   13.7       ~ 31 0
27 NGC 2744 GiG 09 04 39.0017418744 +18 27 51.863760756   13.7       ~ 56 0
28 NGC 2749 GiG 09 05 21.3397567968 +18 18 47.097417600   13.3       ~ 90 0
29 NGC 2751 LIN 09 05 32.3968938768 +18 15 44.238103056   15.1       ~ 20 0
30 NGC 2872 AG? 09 25 42.5308974048 +11 25 55.727649480   13.0       ~ 86 0
31 NGC 2874 LIN 09 25 47.3242685280 +11 25 28.605679896   13.5       ~ 66 0
32 NVSS J093929+062610 rG 09 39 30.1514689200 +06 26 13.256647908   15.2       ~ 10 0
33 Z 35-25 G 09 39 35.2566382536 +06 24 51.897755664   15.3       ~ 20 0
34 NGC 2988 GiP 09 46 47.967 +22 00 43.58   14.3       ~ 11 0
35 NGC 2991 GiP 09 46 50.1188628144 +22 00 50.151268332   14.3       ~ 29 0
36 NGC 2994 LIN 09 47 16.1127790392 +22 05 22.124727528   14.4       ~ 28 0
37 Mrk 1425 H2G 09 47 58.4324759878 +54 00 52.685293663   14.0       ~ 40 0
38 MCG+09-16-053 G 09 48 22.822 +54 00 27.89   15.4       ~ 7 0
39 MCG+00-26-016 LIN 10 05 24.0743954448 +00 32 37.903256628   15.0   13.882   ~ 21 0
40 IC 590 rG 10 05 49.8276132120 +00 38 00.094701480   14.2       ~ 42 0
41 2MASX J10240735+1337038 LIN 10 24 07.3382721312 +13 37 03.927876024   15.2       ~ 19 0
42 UGC 5627 LIN 10 24 08.6915036376 +13 34 22.583800020   14.8       ~ 27 0
43 NGC 3303 LIN 10 37 00.0631479552 +18 08 08.888744688   14.5       ~ 79 0
44 Z 94-98 AG? 10 37 25.3541549472 +18 04 04.371981096   15.1       ~ 16 0
45 Mrk 725 GiG 10 41 50.5248497880 +21 18 41.350328172   15.1       ~ 17 0
46 UGC 5822 G 10 41 52.9250999784 +21 15 09.074146608   15.5       ~ 24 0
47 UGC 6033 LIN 10 55 33.1238781720 +42 17 59.787023028   15.5       ~ 15 0
48 MCG+07-23-003 G 10 56 16.0578482712 +42 19 59.313168660   15.4       ~ 37 0
49 NGC 3567 GiP 11 11 18.6806299080 +05 50 10.606239960   14.4       ~ 24 1
50 MCG+01-29-012 GiP 11 11 20.6620537584 +05 49 49.017833148   15.1       ~ 14 0
51 UGC 6397 AGN 11 23 02.051 +34 29 51.83   15.0       ~ 42 0
52 MCG+06-25-059 AGN 11 23 10.7907923064 +34 29 22.916205744   15.6       ~ 23 0
53 NGC 3719 rG 11 32 13.4583721368 +00 49 09.507252324   13.5   13.4 13.2 ~ 81 0
54 NGC 3720 GiP 11 32 21.5955988704 +00 48 14.526320220   13.7   12.954   ~ 84 0
55 NGC 4003 LIN 11 57 59.0256271248 +23 07 29.592588396   14.8       ~ 77 0
56 NGC 4002 Q? 11 57 59.2928867640 +23 12 07.315231032   14.7       ~ 34 0
57 UGC 7383 G 12 20 01.3187262768 +08 36 28.028241360   14.8       ~ 35 0
58 Z 70-15 G 12 20 09.9554186592 +08 38 40.593609816   15.1       ~ 25 0
59 NGC 4446 GiC 12 28 06.7902002592 +13 54 42.360550668   15.0       ~ 45 0
60 NGC 4447 LIN 12 28 12.5278771992 +13 53 57.186708756   15.2       ~ 37 0
61 2MASX J12564403+3043094 GiC 12 56 44.0155959984 +30 43 09.312087936   15.1       ~ 21 0
62 MCG+05-31-022 LIN 12 56 57.8686002288 +30 42 57.891328704   14.7       ~ 35 0
63 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4798 2
64 MCG+03-35-013 GiP 13 36 53.1547617000 +17 23 13.053926904   15.0       ~ 19 0
65 MCG+03-35-014 LIN 13 36 54.4688832504 +17 24 00.063179316   15.0       ~ 19 0
66 IC 962 LIN 13 57 13.1969546616 +12 01 16.660589736   14.0       ~ 47 0
67 MCG+02-36-002 SyG 13 57 13.8765582984 +11 59 50.914775688   14.9       ~ 45 0
68 NVSS J140447+304436 rG 14 04 48.051 +30 44 37.74   15.5       ~ 35 0
69 UGC 9012 LIN 14 05 28.3271701104 +30 46 01.972911252   15.5       ~ 25 1
70 IC 999 LIN 14 19 32.6698509168 +17 52 31.035909540   14.5       ~ 38 0
71 IC 1000 GiP 14 19 40.3065987960 +17 51 16.798404276   14.4       ~ 36 0
72 UGC 9413 GiP 14 34 08.3770975104 +77 53 57.554339136   14.8       ~ 9 0
73 MCG+13-11-002 GiP 14 34 34.9405426272 +77 57 59.697439236   14.9       ~ 14 0
74 Mrk 820 G 14 40 05.786 +31 30 06.66   15.2       ~ 25 0
75 UGC 9464 G 14 40 37.3417471776 +31 22 29.272434348   14.9       ~ 25 0
76 NGC 5771 LIN 14 52 14.3197462464 +29 50 43.547114040   14.6       ~ 29 0
77 NGC 5773 LIN 14 52 30.4297145904 +29 48 26.533799784   14.5       ~ 28 0
78 IC 1075 GiP 14 54 49.230 +18 06 21.13   14.9       ~ 36 0
79 IC 1076 rG 14 54 59.6003711664 +18 02 14.271883260   13.9       ~ 64 0
80 NGC 5797 GiG 14 56 24.0575666904 +49 41 46.171172220   13.6       ~ 45 0
81 NGC 5804 AGN 14 57 06.786 +49 40 08.60   16.52 15.94     ~ 61 0
82 NGC 5857 Sy2 15 07 27.2947029936 +19 35 51.873280440   13.99 13.11     ~ 64 0
83 NGC 5859 LIN 15 07 34.750 +19 34 56.21   13.10 12.47     ~ 90 0
84 2MASX J15203501+7929456 PaG 15 20 34.9857673176 +79 29 45.740636340   15.1       ~ 9 0
85 2MASX J15334543+2100383 LIN 15 33 45.4493782824 +21 00 38.193325632   15.2       ~ 15 0
86 MCG+04-37-003 G 15 33 48.9126088632 +21 08 10.311382752   14.9       ~ 25 0
87 IC 4576 GiG 15 42 35.5007964288 +23 40 12.237996180   14.8       ~ 21 0
88 IC 4577 GiG 15 42 45.5611339992 +23 47 33.493397532   15.4       ~ 18 0
89 NGC 6018 GiP 15 57 29.7742394496 +15 52 21.408187872   14.6       ~ 41 0
90 NGC 6021 LIN 15 57 30.6915518928 +15 57 21.916949004   14.1       ~ 72 0
91 NGC 6251 Sy2 16 32 31.96989253 +82 32 16.3999044 15.24 14.66 12.89 7.62   ~ 727 0
92 NGC 6252 GiC 16 32 40.5257604072 +82 34 36.488889732   15.1       ~ 21 0
93 NGC 6246 AG? 16 49 52.690 +55 32 30.80   14.2       ~ 32 0
94 UGC 10584 AG? 16 50 13.9753205088 +55 23 04.543583568   14.7       ~ 35 0
95 Z 452-21 G 22 31 40.334 +20 42 50.42   15.4       ~ 13 0
96 UGC 12067 G 22 31 46.4454320712 +20 36 14.295432168   15.3       ~ 19 0
97 IC 5242 EmG 22 41 15.2067009744 +23 24 24.642366696   14.7       ~ 37 0
98 IC 5243 rG 22 41 24.514 +23 22 32.06   14.3       ~ 34 0
99 Mrk 308 SyG 22 41 55.9547870544 +20 15 41.376301128   15.28 14.65     ~ 59 0
100 LEDA 85283 G 22 41 58.469 +20 16 21.15   15.5       ~ 7 0
101 IC 5285 AG? 23 06 58.9445029080 +22 56 11.310244008   14.4       ~ 47 0
102 NGC 7489 AG? 23 07 32.6813971224 +22 59 52.998974304   14.3       ~ 90 0

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