2014A&A...567A..92G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:54:22

2014A&A...567A..92G - Astronomy and Astrophysics, volume 567A, 92-92 (2014/7-1)

Synapses of active galactic nuclei : Comparing X-ray and optical classifications using artificial neural networks.

GONZALEZ-MARTIN O., DIAZ-GONZALEZ D., ACOSTA-PULIDO J.A., MASEGOSA J., PAPADAKIS I.E., RODRIGUEZ-ESPINOSA J.M., MARQUEZ I. and HERNANDEZ-GARCIA L.

Abstract (from CDS):

Many classes of active galactic nuclei (AGN) have been defined entirely through optical wavelengths, while the X-ray spectra have been very useful to investigate their inner regions. However, optical and X-ray results show many discrepancies that have not been fully understood yet. The main purpose of the present paper is to study the synapses (i.e., connections) between X-ray and optical AGN classifications. For the first time, the newly implemented efluxer task allowed us to analyse broad band X-ray spectra of a sample of emission-line nuclei without any prior spectral fitting. Our sample comprises 162 spectra observed with XMM-Newton/pn of 90 local emission line nuclei in the Palomar sample. It includes, from the optical point of view, starbursts (SB), transition objects (T2), low-ionisation nuclear emission line regions (L1.8 and L2), and Seyfert nuclei (S1, S1.8, and S2). We used artificial neural networks (ANNs) to study the connection between X-ray spectra and optical classes. Among the training classes, the ANNs are 90% efficient at classifying the S1, S1.8, and SB classes. The S1 and S1.8 classes show a negligible SB-like component contribution with a wide range of contributions from S1- and S1.8-like components. We suggest that this broad range of values is related to the high degree of obscuration in the X-ray regime. When including all the objects in our sample, the S1, S1.8, S2, L1.8, L2/T2/SB-AGN (SB with indications of AGN activity in the literature), and SB classes have similar average X-ray spectra, but these average spectra can be distinguished from class to class. The S2 (L1.8) class is linked to the S1.8 (S1) class with a larger SB-like component than the S1.8 (S1) class. The L2, T2, and SB-AGN classes constitute a class in the X-rays similar to the S2 class, albeit with larger portions of SB-like component. We argue that this SB-like component might come from the contribution of the host galaxy emission to the X-rays, which is high when the AGN is weak. Up to 80% of the emission line nuclei and, on average, all the optical classes included in our sample show a significant fraction of S1-like or S1.8-like components. Thus, an AGN-like component seems to be present in the vast majority of the emission line nuclei in our sample. The ANN trained in this paper is not only useful for studying the synergies between the optical and X-ray classifications, but might also be used to infer optical properties from X-ray spectra in surveys like eRosita.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - X-rays: galaxies

Simbad objects: 93

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Number of rows : 93

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1008 0
2 NGC 315 LIN 00 57 48.88335 +30 21 08.8122 12.80 12.20 11.16 11.26   ~ 707 2
3 NGC 410 GiG 01 10 58.872 +33 09 07.30 13.08 12.52 11.48     ~ 130 2
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
5 NGC 777 Sy2 02 00 14.934 +31 25 45.78 13.09 12.49 11.45     ~ 156 2
6 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1143 2
7 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4093 2
8 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3545 3
9 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1812 1
10 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1386 1
11 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1149 3
12 NGC 2146 SBG 06 18 37.710 +78 21 25.27 11.67 11.38 10.59     ~ 625 2
13 NGC 2273 Sy2 06 50 08.6724567505 +60 50 44.879789544   14.50 13.54     ~ 459 3
14 NGC 2342 H2G 07 09 18.089 +20 38 09.22   12.92 12.15     ~ 111 0
15 NGC 2655 LIN 08 55 37.731 +78 13 23.10   12.03 11.08     ~ 261 1
16 NGC 2787 LIN 09 19 18.6043000282 +69 12 11.642887220   12.92 11.79     ~ 316 0
17 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 986 1
18 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 986 3
19 NGC 3079 Sy2 10 01 57.80342 +55 40 47.2428 11.57 11.54 10.86     ~ 1248 3
20 NGC 3147 Sy2 10 16 53.632 +73 24 02.34   11.43 10.61     ~ 425 2
21 NGC 3226 GiP 10 23 27.0067240562 +19 53 54.682329315   14.32 13.33     ~ 395 1
22 NGC 3227 GiP 10 23 30.57 +19 51 54.3   12.61 11.79     ~ 1533 2
23 NGC 3310 AGN 10 38 45.857 +53 30 11.89   12.45 12.15     ~ 726 1
24 NGC 3367 Sy1 10 46 34.9540814677 +13 45 03.084131268 11.89 12.05 11.50     ~ 250 1
25 NGC 3516 Sy1 11 06 47.4596406816 +72 34 07.189563769   13.12 12.40     ~ 1418 0
26 M 65 GiP 11 18 55.957 +13 05 31.96   9.6       ~ 405 1
27 NGC 3628 GiP 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 751 3
28 NGC 3665 rG 11 24 43.630 +38 45 46.05 13.71 13.26 11.62     ~ 298 1
29 Mrk 171D AGN 11 28 33.389 +58 33 46.41   16.7       ~ 35 0
30 NGC 3718 GiP 11 32 34.8527469396 +53 04 04.494313634   11.35 10.61     ~ 343 1
31 NGC 3884 LIN 11 46 12.1815824499 +20 23 29.916246389   13.79 12.88 12.61   ~ 142 0
32 NGC 3998 SyG 11 57 56.1333561013 +55 27 12.925850484   11.64 12.10 10.09   ~ 575 2
33 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 1992 1
34 NGC 4102 LIN 12 06 23.115 +52 42 39.42   11.8       ~ 373 1
35 NGC 4138 Sy1 12 09 29.788 +43 41 07.14 12.46 12.29 11.32 10.82   ~ 349 1
36 NGC 4143 LIN 12 09 36.086 +42 32 03.18   13.04 12.08     ~ 212 0
37 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3380 2
38 NGC 4157 GiP 12 11 04.365 +50 29 04.85 12.48 12.15 11.35     ~ 305 2
39 NGC 4168 Sy1 12 12 17.234 +13 12 19.27 12.58 12.11 11.18     ~ 355 2
40 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 864 1
41 NGC 4235 Sy1 12 17 09.8844228368 +07 11 29.665090752   14.70 13.60     ~ 364 0
42 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 763 2
43 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2115 3
44 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1115 0
45 NGC 4278 LIN 12 20 06.82563 +29 16 50.7124 11.54 11.09 10.16     ~ 888 2
46 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 871 2
47 NGC 4314 LIN 12 22 31.978 +29 53 43.09 11.72 11.43 10.58     ~ 450 1
48 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1647 2
49 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1635 2
50 NGC 4378 Sy2 12 25 18.076 +04 55 30.09   14.51 13.49     ~ 221 0
51 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1184 2
52 NGC 4395 Sy2 12 25 48.8639154223 +33 32 48.694684028 10.84 10.54 10.11 9.98   ~ 994 1
53 NGC 4414 GiG 12 26 27.089 +31 13 24.76 11.12 10.96 10.12     ~ 513 2
54 NGC 4459 H2G 12 29 00.026 +13 58 42.89   11.6       ~ 493 0
55 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1959 2
56 NGC 4490 GiP 12 30 36.368 +41 38 37.07 10.03 10.22 9.79     ~ 525 3
57 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6213 3
58 NGC 4494 GiP 12 31 24.034 +25 46 29.93   10.55 9.74     ~ 451 0
59 NGC 4526 GiG 12 34 03.029 +07 41 56.90   10.6       ~ 600 1
60 M 89 LIN 12 35 39.8 +12 33 23 11.29 10.73 9.75     ~ 924 2
61 NGC 4559 H2G 12 35 57.6399424117 +27 57 35.859639262   10.46 10.01     ~ 533 1
62 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 869 0
63 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 610 0
64 M 90 Sy2 12 36 49.816 +13 09 46.33 10.56 10.26 9.54     ~ 795 1
65 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 969 2
66 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1275 3
67 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1041 1
68 NGC 4639 GiP 12 42 52.3781396179 +13 15 26.712929286   13.62 12.72     ~ 557 0
69 NGC 4698 Sy2 12 48 22.9112380605 +08 29 14.648866444   13.24 12.27     ~ 443 0
70 NGC 4725 Sy2 12 50 26.5692916552 +25 30 02.737610391   13.45 12.44     ~ 621 2
71 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1217 3
72 NGC 4845 AGN 12 58 01.242 +01 34 32.09   17.40 16.31     ~ 208 0
73 NGC 5005 GiP 13 10 56.312 +37 03 32.19   14.67 13.67     ~ 497 2
74 NGC 5033 Sy1 13 13 27.535 +36 35 37.14   11.01 12.03 9.73   ~ 796 3
75 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1056 2
76 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 421 0
77 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3782 4
78 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 696 3
79 NGC 5248 GiG 13 37 32.069 +08 53 06.22   11.4       ~ 442 0
80 NGC 5273 Sy1 13 42 08.386 +35 39 15.26   14.01 13.12     ~ 402 0
81 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 382 2
82 NGC 5363 GiP 13 56 07.244 +05 15 16.92 12.59 12.12 10.51     ~ 209 0
83 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1008 2
84 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2393 0
85 NGC 5746 GiP 14 44 56.005 +01 57 17.06   12.3       ~ 324 0
86 NGC 5813 LIN 15 01 11.265 +01 42 07.09 12.00 11.45 10.46 10.06   ~ 579 1
87 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 772 1
88 NGC 5982 LIN 15 38 39.778 +59 21 21.21   12.4       ~ 278 0
89 NGC 6217 AGN 16 32 39.2277115994 +78 11 53.468793359   14.37 13.88     ~ 279 0
90 NGC 6482 GiG 17 51 48.8334002678 +23 04 18.884647281 12.71 12.35 11.45     ~ 190 1
91 NGC 6703 G 18 47 18.8165361086 +45 33 02.284879274   12.29 11.34     ~ 207 0
92 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2235 2
93 NGC 7626 rG 23 20 42.524 +08 13 01.43   12.8       ~ 403 1

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:54:22

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