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


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.13CET06:57:55

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 - 2020
#notes
1 Mrk 1501 Sy1 00 10 31.0058529490 +10 58 29.505989476   15.96 15.40 12.22   ~ 625 0
2 LBQS 0049+0019A QSO 00 52 05.56900 +00 35 38.1461   16.54 16.22     ~ 36 0
3 QSO B0109+224 BLL 01 12 05.8246825085 +22 44 38.786096536   16.00 15.66 15.47   ~ 286 2
4 QSO J0112+2020 QSO 01 12 10.1907458066 +20 20 21.764710091     17 16.8   ~ 45 1
5 ICRF J021417.9+514451 BLL 02 14 17.9395168799 +51 44 51.945994377     16.50 16.5   ~ 75 1
6 PKS 0405-123 Sy1 04 07 48.4309594137 -12 11 36.660481492   15.09 14.86 14.7   ~ 461 1
7 [VV96] J044921.1+072910 QSO 04 49 21.1702317756 +07 29 10.697131328   16.9 16.90     ~ 13 1
8 7C 065109.30+425147.00 BLL 06 54 43.5257637658 +42 47 58.737662093     17.00 14.9   ~ 41 1
9 4C 42.22 BLL 06 56 10.66212 +42 37 02.7510   15.0 16.90 11.1   ~ 55 1
10 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1101 1
11 [VV98] J074451.2+292008 QSO 07 44 51.3640718405 +29 20 06.041952128   17.20 16.97 16.4   ~ 42 1
12 QSO B0823-223 BLL 08 26 01.57293454 -22 30 27.2032544   16.11 16.20     ~ 177 1
13 [VV2006] J084153.9+231955 QSO 08 41 54.0560754580 +23 19 54.745506096   17.2 17.57 17.5   ~ 23 2
14 7C 083849.60+453626.00 QSO 08 42 15.3516827123 +45 25 44.184952131   18.16 17.70 16.5   ~ 47 1
15 QSO B0850.2+2825 QSO 08 53 17.8285403826 +28 13 50.000209957   18.61 18.32 17.5   ~ 44 1
16 QSO J0857+3313 QSO 08 57 26.95320 +33 13 17.1478   18.51 18.25     ~ 18 1
17 Ton 1015 BLL 09 10 37.0355795817 +33 29 24.419639489   16.19 15.71 15.9   ~ 67 2
18 6C 095030+323834 QSO 09 53 27.9563704482 +32 25 51.520435869     17.74 16.34   ~ 47 1
19 Ton 1125 QSO 09 55 37.9394238209 +33 35 03.935732483     17     ~ 43 1
20 Ton 469 Sy1 09 58 20.94963113 +32 24 02.2095353   15.88 15.78 15.51   ~ 388 1
21 7C 102035.29+291154.00 QSO 10 23 24.04612 +28 56 50.9879     17.30 20.57   ~ 26 1
22 Ton 1245 QSO 10 35 10.9913216274 +35 10 19.651751948   18.21 18.01     ~ 28 1
23 87GB 103431.3+572750 BLL 10 37 44.3078863654 +57 11 55.629763116   17.05 16.54 16.7   ~ 85 1
24 CTS 10 Sy1 11 03 31.5267293120 -32 51 16.692763487   16.29 16.30 16.4   ~ 100 1
25 6C 114541+320944 QSO 11 48 18.8795988732 +31 54 10.018515609   17.38 17.28     ~ 38 1
26 7C 1147+2434 BLL 11 50 19.2119754161 +24 17 53.834754764   16.26 15.74 15.80   ~ 238 1
27 [VV98] J120335.4+451049 QSO 12 03 35.3954529580 +45 10 49.563516547   18.26 17.91 17.4   ~ 39 1
28 7C 121240.29+464355.00 QSO 12 15 09.9422873491 +46 27 15.108292547   17.86 17.72 16.7   ~ 45 1
29 6C 121520+302351 BLL 12 17 52.0819140772 +30 07 00.636792927   16.07 15.62 13.47   ~ 392 1
30 QSO B1228+077 QSO 12 31 20.5615478137 +07 25 52.640937700   17.58 17.59     ~ 57 0
31 [VV2006] J124510.0+570954 BLL 12 45 10.0003122020 +57 09 54.373135807   18.33 17.96     ~ 43 1
32 7C 1312+2404 BLL 13 14 43.8061207007 +23 48 26.784058893 17.15 16.83 16.57 15.4   ~ 55 1
33 7C 134515.19+733554.00 BLL 13 46 08.4747358516 +73 20 53.298953268     17.4     ~ 26 1
34 7C 1424+2401 BLL 14 27 00.3918388878 +23 48 00.035406946 14.52 14.34 14.95 14.5   ~ 276 1
35 2MASSI J1431258+244220 Sy1 14 31 25.8845083619 +24 42 20.704368998   17.74 17.65     ~ 31 0
36 QSO B1518+162 QSO 15 20 37.0608783362 +16 01 26.629983417     17.5     ~ 19 1
37 [VV2006] J153714.5+230040 QSO 15 37 14.50087 +23 00 40.5110   19.32 19.20     ~ 16 0
38 QSO B1556+335 QSO 15 58 55.1864547958 +33 23 18.607516553   18.22 17.79 17.6   ~ 92 1
39 7C 160323.39+695408.00 QSO 16 03 18.6214913119 +69 45 57.441607080     17.12     ~ 15 1
40 [VV98] J160820.5+601828 BLL 16 08 20.54236 +60 18 28.1993     16.00 15.9   ~ 22 0
41 7C 161203.70+375027.00 QSO 16 13 51.3384133415 +37 42 58.723954662   19.09 18.88     ~ 33 1
42 [VV2000] J161447.0+374607 QSO 16 14 46.9581157053 +37 46 07.280187635   17.35 16.98 16.8   ~ 38 1
43 7C 161829.80+530315.00 QSO 16 19 42.3889179390 +52 56 13.394790991   17.01 16.72 16.2   ~ 21 1
44 QSO B1722+119 BLL 17 25 04.34087 +11 52 15.4688   16.29 15.77 14.45   ~ 162 1
45 [VV2006] J173052.7+602517 QSO 17 30 52.7132464598 +60 25 16.726009695   18.16 17.94     ~ 28 0
46 2MASX J17423197+5945065 BLL 17 42 32.0005041783 +59 45 06.732843996   17.74 17.14 16.7   ~ 62 1
47 7C 175322.39+335119.00 Sy1 17 55 11.2443174182 +33 50 59.801116881     17.90     ~ 16 1
48 QSO B1759+7539 QSO 17 57 46.3591958319 +75 39 16.182864362     16.50     ~ 78 0
49 [VV2006] J181157.1+521427 QSO 18 11 57.0796211364 +52 14 26.754016623     17.09     ~ 7 0
50 7C 181142.79+314318.00 BLL 18 13 35.2028793055 +31 44 17.620197311     17.4 15.2   ~ 71 1
51 [VV2006] J181910.1+551109 QSO 18 19 10.0850685789 +55 11 08.551732427     17.03     ~ 7 0
52 2MASS J18385855+5735392 BLL 18 38 58.5598203352 +57 35 39.267071820     16.93 15.4   ~ 15 1
53 [VV98] J205429.6+240734 QSO 20 54 29.53301 +24 07 33.7664     16.50     ~ 12 1
54 6C 211108+800844 Sy1 21 09 19.1613325762 +80 21 11.224981522     17.90     ~ 18 1
55 [VV98] J213029.8+333248 QSO 21 30 29.7009818518 +33 32 49.052221145     17.90     ~ 10 0
56 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1520 1
57 2MASX J22500577+3824371 BLL 22 50 05.7480525271 +38 24 37.195160708     16.00 14.8   ~ 94 1
58 QSO B2254+0727 BLL 22 57 17.30312249 +07 43 12.3024770   17.07 16.36     ~ 279 1
59 ICRF J230343.5-680737 Sy1 23 03 43.5650270994 -68 07 37.443084908   16.26 16.38 17.68   ~ 73 1
60 [VV2006] J231834.0+240440 QSO 23 18 33.9676436339 +24 04 39.748126360     17.20     ~ 14 1
61 87GB 232252.5+394057 BLL 23 25 17.8704120896 +39 57 36.514040778   17.8 17.80 17.8   ~ 58 1

    Equat.    Gal    SGal    Ecl

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2019.11.13-06:57:55

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