2013A&A...550A..71V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:08:16

2013A&A...550A..71V - Astronomy and Astrophysics, volume 550A, 71-71 (2013/2-1)

Variability and the X-ray/UV ratio of active galactic nuclei. II. Analysis of a low-redshift Swift sample.

VAGNETTI F., ANTONUCCI M. and TREVESE D.

Abstract (from CDS):

Variability, both in X-ray and optical/UV, affects the well-known anti-correlation between the αox spectral index and the UV luminosity of active galactic nuclei, contributing part of the dispersion around the average correlation (intra-source dispersion) in addition to the differences among the time-average αox values from source to source (inter-source dispersion). We aim to evaluate the intrinsic αox variations in individual objects and their effect on the dispersion of the αox-LUV anti-correlation. We used simultaneous UV/X-ray data from Swift observations of a low-redshift sample to derive the epoch-dependent αox(t) indices. We corrected for the host galaxy contribution by a spectral fit of the optical/UV data. We computed ensemble structure functions to analyse the variability of multi-epoch data. We find a strong intrinsic αox variability, which significantly contributes (∼40% of the total variance) to the dispersion of the αox-LUV anti-correlation (intra-source dispersion). The strong X-ray variability and weaker UV variability of this sample are comparable to other samples of low-z active galactic nuclei, and are neither caused by the high fraction of strongly variable narrow line Seyfert 1 galaxies, nor by dilution of the optical variability by the host galaxies. Dilution instead affects the slope of the anti-correlation, which steepens, once corrected, and becomes similar to higher luminosity sources. The structure function of αox increases with the time lag up to about one month. This indicates the important contribution of the intermediate-to-long timescale variations, which are possibly generated in the outer parts of the accretion disk.

Abstract Copyright:

Journal keyword(s): surveys - galaxies: active - quasars: general - X-rays: galaxies

Simbad objects: 87

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Number of rows : 87

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 Mrk 335 Sy1 00 06 19.5371542746 +20 12 10.617456059   14.19 13.85     ~ 1091 0
2 ESO 242-8 Sy1 00 25 01.2569387883 -45 29 54.656924011   15.82 15.75 15.40   ~ 22 0
3 Ton S 180 Sy1 00 57 20.2038086128 -22 22 56.577563819   14.60 14.34 15.23   ~ 270 0
4 6dFGS gJ005837.4-360605 Sy1 00 58 37.3829859140 -36 06 04.950912106   14.9 14.90 15.0   ~ 80 0
5 2MASX J01002713-5113544 Sy1 01 00 27.0974105988 -51 13 54.100963840   16.48 15.4 15.17   ~ 43 0
6 2MASS J01053879-1416135 Sy1 01 05 38.7923334877 -14 16 13.579116767   13.6 15.51 15.17 14.43 ~ 29 1
7 2MASS J01173065-3826297 Sy1 01 17 30.6535169159 -38 26 29.718014711   18.26 16.5 17.25   ~ 17 0
8 2E 357 Sy1 01 19 35.6919706175 -28 21 31.421837195   18.13 16.3 16.58   ~ 48 0
9 MCG-03-04-072 Sy1 01 28 06.7201064277 -18 48 31.059816246   15 15.5     ~ 27 0
10 6dFGS gJ013416.9-425826 Sy1 01 34 16.9070384920 -42 58 26.220856306   18.17 17.30 16.71   ~ 65 0
11 2MASS J01365444-3509524 Sy1 01 36 54.4577149075 -35 09 52.330090067   18.80 18.0 17.80   ~ 42 0
12 2MASS J01482232-2758257 Sy1 01 48 22.3290197015 -27 58 25.631437311   17.72 15.0 16.37   ~ 29 0
13 RX J0152.4-2319 Sy1 01 52 27.0844991894 -23 19 53.628308440   17.39 15.6 16.18   ~ 24 0
14 Mrk 1044 Sy1 02 30 05.5224714146 -08 59 53.208069457   14.74 14.29 13.981 13.585 ~ 217 0
15 NGC 985 Sy1 02 34 37.882 -08 47 17.02   14.64 14.28 12.9   ~ 345 0
16 RX J0311.3-2046 Sy1 03 11 18.8103293782 -20 46 18.139567365   16.97 16.47 15.82   ~ 32 0
17 2MASX J03194856-2627132 Sy1 03 19 48.5579204938 -26 27 12.764361471   12.5 15.9 12.3   ~ 24 0
18 2MASX J03231532-4931064 Sy1 03 23 15.2954486365 -49 31 06.105774655   16.62 16.5 15.57   ~ 36 0
19 ESO 301-13 Sy1 03 24 58.4837768334 -41 53 33.566233730   15.89 15.5 14.41   ~ 16 1
20 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1811 1
21 6dFGS gJ033340.2-370655 Sy1 03 33 40.1725210995 -37 06 54.214814054   15.5 16.1 15.4   ~ 22 0
22 6dFGS gJ034907.7-471104 Sy1 03 49 07.7092693675 -47 11 04.119751444   18.29 16.8 17.01   ~ 14 0
23 FRL 1116 Sy1 03 51 41.6987614546 -40 27 59.268394423   15.10 14.67 12.1   ~ 60 0
24 ESO 359-19 Sy1 04 05 01.6844711014 -37 11 15.047299096   15.24   14.96   ~ 35 0
25 2MASS J04124148-4712461 Sy1 04 12 41.4855735842 -47 12 46.018105223 14.96 15.78 15.42     ~ 16 0
26 LB 1727 Sy1 04 26 00.7188445954 -57 12 01.772037544 13.68 14.58 14.37 14.8   ~ 235 0
27 FRL 303 Sy1 04 30 40.0330092385 -53 36 55.649189836 15.90 16.00 15.6 12.4   ~ 46 0
28 2MAXI J0439-468 Sy1 04 37 28.1558173753 -47 11 29.480246524 14.68 16.61 14.95 15.43   ~ 68 0
29 [VV98] J043938.7-531131 Sy1 04 39 38.7158844487 -53 11 31.246585806     16.2     ~ 34 0
30 2MASX J08590289+4846093 Sy1 08 59 02.8979809285 +48 46 09.343721004   15.49 15.31     ~ 19 0
31 2MASX J09023358-0700041 AGN 09 02 33.5678624813 -07 00 04.323768588   17.70   16.72   ~ 17 0
32 Mrk 110 Sy1 09 25 12.8479868736 +52 17 10.386808297   16.82 16.41     ~ 510 0
33 2MASSI J1005418+433240 Sy1 10 05 41.8619295274 +43 32 40.446116728   17.09 16.89     ~ 73 0
34 [VV2006c] J100710.2+220302 Sy1 10 07 10.13 +22 03 14.6     17.0     ~ 16 0
35 Ton 1187 Sy1 10 13 03.1812987700 +35 51 23.744219932   15.60 15.42     ~ 75 0
36 Mrk 141 Sy1 10 19 12.5634677324 +63 58 02.618352314   16.32 16.00     ~ 134 0
37 Mrk 142 Sy1 10 25 31.2788890554 +51 40 34.868795739   16.33 16.12     ~ 232 0
38 2MASS J11171007+6522073 Sy1 11 17 10.0678479110 +65 22 07.230358535   16.8 16.4     ~ 26 0
39 Ton 1388 Sy1 11 19 08.6786143504 +21 19 17.986556889   14.91 14.80     ~ 414 0
40 2MASX J11310476+6851528 Sy1 11 31 04.7646709179 +68 51 52.997211690   16.17 15.27     ~ 31 0
41 Ton 580 Sy1 11 31 09.4822135528 +31 14 05.506427771   16.22 16.05 15.8   ~ 129 1
42 2MASX J11384966+5742437 Sy1 11 38 49.6019975288 +57 42 43.533935589   18.07 17.75     ~ 39 0
43 2MASX J11442989+3653085 Sy1 11 44 29.8708446823 +36 53 08.615386681   16.26 15.49     ~ 63 0
44 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 1991 1
45 2E 2584 Sy1 12 04 42.1097577213 +27 54 11.867990165   15.64 15.60     ~ 351 0
46 2E 2598 Sy1 12 09 45.2141873217 +32 17 01.100656246   17.80 17.58     ~ 40 0
47 PB 3894 Sy1 12 14 17.6737003918 +14 03 13.182526431   14.46 14.19     ~ 738 0
48 NGC 4253 Sy1 12 18 26.5155239433 +29 48 46.518670434   14.34 13.57     ~ 930 1
49 NGC 4288 GiG 12 20 38.119 +46 17 27.67   13.6       ~ 146 0
50 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5316 1
51 2MASS J12313656+7044144 Sy1 12 31 36.5587967928 +70 44 14.354955852     15.66     ~ 42 0
52 NGC 4593 Sy1 12 39 39.4435521178 -05 20 39.035028119   13.95 13.15     ~ 948 0
53 2MASS J13041699+0205369 Sy1 13 04 16.9955586038 +02 05 37.010915804   17.71 17.43     ~ 42 0
54 2E 2978 Sy1 13 09 47.0029670396 +08 19 48.215010428   16.04 15.89     ~ 342 0
55 2MASS J13195706+5235338 Sy1 13 19 57.0704936832 +52 35 33.712791687   18.40 17.94     ~ 28 0
56 Ton 730 Sy1 13 43 56.7433437047 +25 38 47.639948043   16.48 16.6     ~ 103 0
57 2MASX J13551655+5612451 Sy1 13 55 16.5546440461 +56 12 44.628621988   17.38 17.09     ~ 60 0
58 Ton 182 Sy1 14 05 16.2180155773 +25 55 34.116787862   15.42 15.34     ~ 231 0
59 2MASX J14133671+7029501 Sy1 14 13 36.7140452157 +70 29 50.446750041     16.9     ~ 18 0
60 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2391 0
61 Mrk 813 Sy1 14 27 25.0494164803 +19 49 52.267903001   15.42 15.27     ~ 68 0
62 Mrk 684 Sy1 14 31 04.7823224993 +28 17 14.127794327   15.36 14.68     ~ 85 0
63 Mrk 478 Sy1 14 42 07.4713423763 +35 26 22.939531895   14.91 14.58     ~ 484 0
64 Mrk 841 Sy1 15 04 01.1935077982 +10 26 15.778741853   14.50 14.27     ~ 583 0
65 Mrk 493 Sy1 15 59 09.6228325606 +35 01 47.568001984   15.69 15.06     ~ 262 0
66 Mrk 876 Sy1 16 13 57.1791807197 +65 43 09.953889666   16.03 15.49     ~ 511 0
67 2MASX J16195129+4058472 Sy1 16 19 51.3111911785 +40 58 47.320549097   17.81 17.34     ~ 54 0
68 QSO B1626+5529 Sy1 16 27 56.1124169072 +55 22 31.559608363   15.79 15.68     ~ 188 0
69 2MASS J16290130+4007599 Sy1 16 29 01.3106183526 +40 07 59.907182858   18.23 18.00 17.2   ~ 98 0
70 2MASSI J1702310+324719 Sy1 17 02 31.0622384749 +32 47 19.646117689   16.19 15.98     ~ 60 0
71 Mrk 1513 Sy1 21 32 27.8163185343 +10 08 19.250705656   14.92 14.64     ~ 538 0
72 RX J2216.9-4451 Sy1 22 16 53.2184927992 -44 51 56.951477772   17.80 15.8 16.25   ~ 25 1
73 6dFGS gJ221756.6-594130 Sy1 22 17 56.6561264472 -59 41 30.817920584 16.30 17.08 16.78 16.80   ~ 41 0
74 6dFGS gJ224237.7-384516 Sy1 22 42 37.6890961362 -38 45 16.299296454   18.50 16.9 17.05   ~ 17 0
75 2MASS J22452029-4652116 Sy1 22 45 20.3094 -46 52 11.796     14.8     ~ 26 0
76 2MASX J22573900-3656063 Sy1 22 57 39.0247421955 -36 56 06.521071890   16.59 16.0 15.64   ~ 55 0
77 2MASX J22584540-2609138 Sy1 22 58 45.3697151664 -26 09 14.183968567   17.31 16.1 16.14   ~ 18 0
78 2MAXI J2301-591 Sy1 23 01 36.2303063047 -59 13 21.086895470   17.88   16.20   ~ 24 0
79 6dFGS gJ230152.0-550831 Sy1 23 01 52.0210261721 -55 08 30.863529439   17.24 15.4 16.08   ~ 24 0
80 2dFGRS TGS538Z275 Sy1 23 04 37.4064781520 -35 01 13.589474270   16.755 16.6 15.558   ~ 15 0
81 6dFGS gJ231234.8-340420 Sy1 23 12 34.7719028199 -34 04 20.168271933   17.95 17.20 16.73   ~ 18 1
82 2MASX J23174996-4422275 Sy1 23 17 49.9494788280 -44 22 27.802516393   17.96 16.8 16.84   ~ 20 0
83 2MASS J23251179-3236346 Sy1 23 25 11.7928414356 -32 36 34.545528118   18.12 17.0 17.02   ~ 17 1
84 2MASX J23252420-3826492 Sy1 23 25 24.1872124880 -38 26 49.188771220   14.84 14.24     ~ 43 0
85 2E 4755 Sy1 23 43 28.5430003224 -14 55 30.610389619   17.45 15.91 16.50   ~ 37 0
86 2MASX J23492400-3126028 Sy1 23 49 24.0315 -31 26 02.559   16.864 16.6 15.687   ~ 21 0
87 MCG-05-01-012 PaG 23 57 26.7 -30 27 33   15.12       ~ 23 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:08:16

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