2018A&A...611A..52T


Query : 2018A&A...611A..52T

2018A&A...611A..52T - Astronomy and Astrophysics, volume 611A, 52-52 (2018/3-1)

Variability of extragalactic sources: its contribution to the link between ICRF and the future Gaia Celestial Reference Frame.

TARIS F., DAMLJANOVIC G., ANDREI A., SOUCHAY J., KLOTZ A. and VACHIER F.

Abstract (from CDS):


Context. The first release of the Gaia catalog is available since 14 September 2016. It is a first step in the realization of the future Gaia reference frame. This reference frame will be materialized by the optical positions of the sources and will be compared with and linked to the International Celestial Reference Frame, materialized by the radio position of extragalactic sources. Aim. As in the radio domain, it can be reasonably postulated that quasar optical flux variations can alert us to potential changes in the source structure. These changes could have important implications for the position of the target photocenters (together with the evolution in time of these centers) and in parallel have consequences for the link of the reference systems.
Methods. A set of nine optical telescopes was used to monitor the magnitude variations, often at the same time as Gaia, thanks to the Gaia Observation Forecast Tool. The Allan variances, which are statistical tools widely used in the atomic time and frequency community, are introduced.
Results. This work describes the magnitude variations of 47 targets that are suitable for the link between reference systems. We also report on some implications for the Gaia catalog. For 95% of the observed targets, new information about their variability is reported. In the case of some targets that are well observed by the TAROT telescopes, the Allan time variance shows that the longest averaging period of the magnitudes is in the range 20-70d. The observation period by Gaia for a single target largely exceeds these values, which might be a problem when the magnitude variations exhibit flicker or random walk noises. Preliminary computations show that if the coordinates of the targets studied in this paper were affected by a white-phase noise with a formal uncertainty of about 1mas (due to astrophysical processes that are put in evidence by the magnitude variations of the sources), it would affect the precision of the link at the level of 50µas.

Abstract Copyright: © ESO 2018

Journal keyword(s): reference systems - quasars: general - galaxies: photometry - methods: data analysis

VizieR on-line data: <Available at CDS (J/A+A/611/A52): list.dat table3.dat>

Simbad objects: 61

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Number of rows : 61
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Mrk 1501 Sy1 00 10 31.00590413 +10 58 29.5042981   15.96 15.40 12.22   ~ 689 0
2 LBQS 0049+0019A QSO 00 52 05.5690063368 +00 35 38.149368180   16.54 16.22     ~ 47 1
3 QSO B0109+224 BLL 01 12 05.8247044608 +22 44 38.785880796   16.00 15.66 15.47   ~ 324 2
4 QSO B0109+2004 QSO 01 12 10.1908105872 +20 20 21.765069636     17 16.8   ~ 52 1
5 ICRF J021417.9+514451 BLL 02 14 17.9358553848 +51 44 51.945795816     16.50 16.5   ~ 98 1
6 PKS 0405-123 Sy1 04 07 48.4309841856 -12 11 36.659928408   15.09 14.86 14.7   ~ 491 1
7 [VV96] J044921.1+072910 QSO 04 49 21.1706414880 +07 29 10.696519500   16.9 16.90     ~ 16 1
8 7C 065109.30+425147.00 BLL 06 54 43.5253496568 +42 47 58.730753904     17.00 14.9   ~ 43 1
9 4C 42.22 BLL 06 56 10.66207584 +42 37 02.7512524   15.0 16.90 11.1   ~ 71 1
10 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 14.17 14.27   ~ 1238 1
11 [VV98] J074451.2+292008 Bla 07 44 51.3643230792 +29 20 06.038217348   17.20 16.97 16.4   ~ 52 1
12 QSO B0823-223 BLL 08 26 01.5730900658 -22 30 27.204409684   16.11 16.20     ~ 196 1
13 [VV2006] J084153.9+231955 QSO 08 41 54.0565256832 +23 19 54.742181124   17.2 17.57 17.5   ~ 29 2
14 7C 083849.60+453626.00 Bla 08 42 15.3516545208 +45 25 44.182186752   18.16 17.70 16.5   ~ 58 1
15 QSO B0850.2+2825 QSO 08 53 17.8287531816 +28 13 49.996624692   18.61 18.32 17.5   ~ 53 1
16 QSO J0857+3313 QSO 08 57 26.95320 +33 13 17.1478   18.51 18.25     ~ 25 1
17 Ton 1015 BLL 09 10 37.0353299208 +33 29 24.418940568   16.19 15.71 15.9   ~ 83 2
18 6C 095030+323834 Bla 09 53 27.9566471448 +32 25 51.520311120     17.74 16.34   ~ 59 1
19 Ton 1125 QSO 09 55 37.9390883544 +33 35 03.940465164     17 16.72   ~ 59 1
20 Ton 469 Sy1 09 58 20.9496221568 +32 24 02.208417372   15.88 15.78 15.51   ~ 416 1
21 7C 102035.29+291154.00 QSO 10 23 24.0470148912 +28 56 50.986853628     17.30 20.57   ~ 26 1
22 Ton 1245 QSO 10 35 10.9912113312 +35 10 19.648536384   18.21 18.01     ~ 35 1
23 87GB 103431.3+572750 BLL 10 37 44.3078432736 +57 11 55.629345156   17.05 16.54 16.7   ~ 105 1
24 CTS 10 Sy1 11 03 31.5264793968 -32 51 16.694017200   16.29 16.30 16.4   ~ 110 1
25 7C 1145+3211 QSO 11 48 18.8798813232 +31 54 10.016997660   17.38 17.28     ~ 45 1
26 7C 1147+2434 BLL 11 50 19.21218244 +24 17 53.8352318   16.26 15.74 15.80   ~ 265 1
27 [VV98] J120335.4+451049 QSO 12 03 35.3956118304 +45 10 49.565300952   18.26 17.91 17.4   ~ 47 1
28 6C 121240+464354 QSO 12 15 09.9422143704 +46 27 15.107100912   17.86 17.72 16.7   ~ 52 1
29 6C 121520+302351 BLL 12 17 52.0819904040 +30 07 00.634936872   16.07 15.62 13.47   ~ 449 1
30 QSO B1228+077 QSO 12 31 20.5617745320 +07 25 52.635019800   17.58 17.59     ~ 66 0
31 [VV2006] J124510.0+570954 BLL 12 45 09.9995503080 +57 09 54.373550040   18.33 17.96     ~ 56 1
32 7C 1312+2404 BLL 13 14 43.8062104200 +23 48 26.782554060 17.15 16.83 16.57 15.4   ~ 72 1
33 8C 1345+735 BLL 13 46 08.4750511056 +73 20 53.297225448     17.4     ~ 34 1
34 7C 1424+2401 BLL 14 27 00.3917926224 +23 48 00.037510776 14.52 14.34 14.95 14.5   ~ 331 1
35 ICRF J143125.8+244220 Sy1 14 31 25.8850030680 +24 42 20.705101380   17.74 17.65     ~ 42 0
36 QSO B1518+162 QSO 15 20 37.0611260640 +16 01 26.631499224     17.5     ~ 28 1
37 [VV2006] J153714.5+230040 QSO 15 37 14.5007177808 +23 00 40.509810576   19.32 19.20     ~ 24 1
38 QSO B1556+335 Bla 15 58 55.1864381376 +33 23 18.608916984   18.22 17.79 17.6   ~ 102 1
39 7C 1603+6954 QSO 16 03 18.6214571448 +69 45 57.441631248     17.12     ~ 19 1
40 QSO J1608+6018 BLL 16 08 20.5424263152 +60 18 28.200689748     16.00 15.9   ~ 27 0
41 6C 161203+375029 QSO 16 13 51.3381365496 +37 42 58.718053872   19.09 18.88     ~ 38 1
42 [VV2000] J161447.0+374607 QSO 16 14 46.9582157544 +37 46 07.280229756   17.35 16.98 16.8   ~ 46 1
43 7C 161829.80+530315.00 BLL 16 19 42.3887715600 +52 56 13.395126444   17.01 16.72 16.2   ~ 32 1
44 QSO B1722+119 BLL 17 25 04.3409350008 +11 52 15.471967296   16.29 15.77 14.45   ~ 189 1
45 [VV2006] J173052.7+602517 BLL 17 30 52.7128612584 +60 25 16.728022236   18.16 17.94     ~ 34 0
46 ICRF J174232.0+594506 BLL 17 42 31.9998615600 +59 45 06.731291412   17.74 17.14 16.7   ~ 73 1
47 ICRF J175511.2+335059 Sy1 17 55 11.24486903 +33 50 59.7967692     17.90     ~ 17 1
48 QSO B1759+7539 BLL 17 57 46.3590423768 +75 39 16.181909928     16.50     ~ 85 0
49 [VV2006] J181157.1+521427 QSO 18 11 57.0792235104 +52 14 26.755115460     17.09     ~ 8 0
50 7C 181142.79+314318.00 BLL 18 13 35.2028439312 +31 44 17.620234836     17.4 15.2   ~ 93 1
51 [VV2006] J181910.1+551109 QSO 18 19 10.0857517320 +55 11 08.553214248     17.03     ~ 10 0
52 ICRF J183858.5+573539 BLL 18 38 58.5619131144 +57 35 39.281717976     16.93 15.4   ~ 18 1
53 [VV98] J205429.6+240734 QSO 20 54 29.53307973 +24 07 33.7650459     16.50     ~ 15 1
54 ICRF J210919.1+802111 Sy1 21 09 19.1629218840 +80 21 11.223777744     17.90     ~ 20 1
55 [VV98] J213029.8+333248 QSO 21 30 29.69958649 +33 32 49.0563794     17.90     ~ 12 0
56 QSO B2155-304 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1671 1
57 LEDA 2126234 BLL 22 50 05.7481607616 +38 24 37.193100984     16.00 14.8   ~ 117 1
58 QSO B2254+0727 BLL 22 57 17.30311778 +07 43 12.3025633   17.07 16.36     ~ 295 1
59 ICRF J230343.5-680737 Sy1 23 03 43.56459610 -68 07 37.4431119   16.26 16.38 17.68   ~ 81 1
60 BWE 2316+2347 QSO 23 18 33.96784020 +24 04 39.7492772     17.20     ~ 21 1
61 ICRF J232517.8+395736 BLL 23 25 17.8701567192 +39 57 36.512873352   17.8 17.80 17.8   ~ 65 1

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2023.01.26-23:56:18

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