2011A&A...526A..25T


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:40:09

2011A&A...526A..25T - Astronomy and Astrophysics, volume 526A, 25-25 (2011/2-1)

Astrophotometric variability of CFHT-LS Deep 2 QSOs.

TARIS F., SOUCHAY J., ANDREI A.H., BERNARD M., SALABERT M., BOUQUILLON S., ANTON S., LAMBERT S.B., GONTIER A.-M. and BARACHE C.

Abstract (from CDS):

The current conventional realization of the ICRS (International Celestial Reference System) is, in the radio wavelength, the International Celestial Reference Frame 2 (ICRF2). The individual positions of the defining sources have been found to have accuracies better than 1 milliarcsecond (mas). In 2012, the European astrometric satellite Gaia will be launched. This mission will provide an astrometric catalog of an estimated number of 500000 QSOs. The uncertainty in the coordinates is anticipated to be 200 microarcsecond (µas) for the magnitude =20. If this were achieved, the ICRF and the Gaia related reference frame could be related with a µas accuracy. The goal of this work is both to measure the photometric variability of a set of quasars in a given field, and search wether this variability can be related to an astrometric instability characterized by a motion of the quasar photocenter. If this correlation existed for some given QSO, then it would be inadequate to materialize the Gaia extragalactic reference frame at the level of confidence required, i.e. the sub-milliarcsecond one. This should be an important result in the scope of the Gaia mission. We use QSO CCD images obtained over 4.5 years with the Canada France Hawaie Telescope (CFHT) in the framework of the CFHT-Legacy Survey (CFHT-LS). The pictures were analysed with both the SExtractor software and customised codes to perform a photometric calibration together with an astrometric one. A total of 41 QSOs in the Deep 2 field were analysed. Magnitude variations during more than 50 months are given at three different bandwiths G, R, and I. Among the set above, 5 quasars were chosen to test the ties between the postion of their centroid and their magnitude variations. For one of these 5 QSOs, the proximity of a neighbouring star allows the comparison between the PSFs. We clearly show significant photometric variations reaching sometimes more than one magnitude, for a good proportion of the 41 quasars in our sample. We show that these variations often occur within a few months, and that the correlation between the photometric curves in the three bands, G, R and I is obvious. As a second important result, we show that with a reasonably high probability, photometric variations for one quasar in our sample are accompagnied by substantial modification of its PSF.

Abstract Copyright:

Journal keyword(s): reference systems - astrometry - quasars: general

Simbad objects: 45

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Number of rows : 45

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 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3962 5
2 [VV2006] J095848.9+023441 QSO 09 58 48.8621129836 +02 34 41.129301226   20.73 20.54   20.656 ~ 40 0
3 3XMM J095902.7+021906 QSO 09 59 02.7606929940 +02 19 06.380394620   19.792 19.450 19.10 18.92 ~ 54 0
4 [VV2006] J095903.2+022002 QSO 09 59 03.2398 +02 20 02.676   21.17 20.84   21.11 ~ 29 0
5 [VV2006] J095918.7+020951 QSO 09 59 18.7048456657 +02 09 51.490284148 20.57 20.30 19.93   19.451 ~ 55 0
6 COSMOS J095921.30+024030.4 Sy1 09 59 21.2953854414 +02 40 30.335492869 20.32 19.74 19.30   17.320 ~ 36 0
7 [VV2006] J095928.3+021950 QSO 09 59 28.3316960714 +02 19 50.488988515 21.22 20.86 21.07   20.777 ~ 36 0
8 [VV2006] J095929.2+022033 QSO 09 59 29.24 +02 20 34.4   21.899 22.038   21.86 ~ 30 0
9 [VV2006] J095934.8+021422 QSO 09 59 34.8953975425 +02 14 22.114996800   20.757 20.934   20.85 ~ 26 0
10 SDSS J095940.04+022313.3 * 09 59 40.044 +02 23 13.32           ~ 1 0
11 [VV2006] J095940.0+022306 QSO 09 59 40.0609731052 +02 23 06.672295405   20.448 20.353   20.162 ~ 35 0
12 [VV2006] J095940.7+021938 QSO 09 59 40.743 +02 19 38.85 21.30 20.81 20.69   20.15 ~ 37 0
13 [VV2006] J095942.1+024103 QSO 09 59 42.084 +02 41 03.14 21.01 20.69 20.58   20.311 ~ 32 0
14 [VV2006] J100010.2+023745 QSO 10 00 10.198 +02 37 44.97   21.048 20.959   20.21 ~ 25 0
15 [VV2006] J100012.9+023523 QSO 10 00 12.9094437876 +02 35 22.829566330   19.0 19.24 18.5 18.89 ~ 60 0
16 [VV2006] J100024.4+015053 QSO 10 00 24.3913054986 +01 50 53.962422121   20.62 20.26   19.428 ~ 46 0
17 [VV2006] J100024.5+020619 QSO 10 00 24.4793349996 +02 06 19.676866182   19.43 19.42   19.89 ~ 39 0
18 [VV2006] J100024.6+023148 QSO 10 00 24.6424077979 +02 31 49.092194235 19.22 18.80 18.87 18.89 18.93 ~ 53 0
19 [VV2006] J100025.1+024128 QSO 10 00 25.071 +02 41 28.46   21.265 21.314   21.08 ~ 24 0
20 [VV2006] J100031.6+014757 QSO 10 00 31.619 +01 47 57.77   20.68 20.56   20.90 ~ 29 0
21 [VV2006] J100033.4+015237 QSO 10 00 33.390 +01 52 37.05   20.955 20.678   20.392 ~ 30 0
22 [VV2006] J100034.9+020235 QSO 10 00 34.9393 +02 02 34.906   20.876 20.844   20.710 ~ 31 0
23 [VV2006] J100038.0+020822 QSO 10 00 38.0147122630 +02 08 22.396690298   20.698 20.617   20.45 ~ 50 0
24 [VV2006] J100051.5+021215 QSO 10 00 51.517 +02 12 15.30   21.10 20.99   20.99 ~ 30 0
25 [VV2006] J100055.4+023441 QSO 10 00 55.3884 +02 34 41.314 20.85 20.25 20.37   20.05 ~ 52 0
26 [VV2006] J100055.6+022150 QSO 10 00 55.629 +02 21 50.41   20.651 20.764   20.58 ~ 20 0
27 [VV2006] J100058.3+015208 QSO 10 00 58.335 +01 52 08.57   20.963 21.084   20.891 ~ 26 0
28 [VV2006] J100058.8+015400 QSO 10 00 58.841 +01 54 00.22   20.242 20.432   20.008 ~ 51 0
29 [VV2006] J100111.9+023024 QSO 10 01 11.9247 +02 30 24.417   21.69 21.43   21.02 ~ 31 0
30 [VV2006] J100112.6+020939 QSO 10 01 12.6206737548 +02 09 39.830914108   20.331 20.409   20.199 ~ 25 0
31 [VV2006] J100114.3+022356 QSO 10 01 14.296 +02 23 56.87 19.71 19.44 19.46   19.165 ~ 56 0
32 [VV2006] J100120.2+020341 QSO 10 01 20.2482632433 +02 03 41.220323278   20.75 20.46   20.41 ~ 27 0
33 [VV2006] J100120.2+023341 QSO 10 01 20.264 +02 33 41.31   20.46 20.31   20.08 ~ 51 0
34 [VV2006] J100129.7+020643 QSO 10 01 29.6699888742 +02 06 43.284905823   21.51 21.27   20.95 ~ 26 0
35 [VV2006] J100145.1+022456 QSO 10 01 45.156 +02 24 57.00   20.58 20.40   20.440 ~ 43 0
36 [VV2006] J100147.9+021446 QSO 10 01 47.897 +02 14 47.16   20.70 20.48   20.485 ~ 26 0
37 [VV2006] J100151.1+020032 QSO 10 01 51.1117489242 +02 00 32.439852761   20.36 20.05   20.015 ~ 36 0
38 [VV2006] J100158.9+022445 QSO 10 01 58.9156 +02 24 45.101   21.738 21.751   21.60 ~ 31 0
39 [VV2006] J100159.5+023935 QSO 10 01 59.4218032578 +02 39 35.630326050   20.944 20.909   20.43 ~ 27 0
40 [VV2006] J100202.8+022434 QSO 10 02 02.777 +02 24 34.63   20.58 20.33 20.11 20.33 ~ 46 0
41 [VV2006] J100210.7+023025 QSO 10 02 10.7193359534 +02 30 26.188915281   19.887 19.673 19.0 19.393 ~ 46 0
42 [VV2006] J100217.4+022959 QSO 10 02 17.4171762697 +02 29 59.751547782   20.84 20.48   20.68 ~ 27 0
43 [VV2006] J100219.5+015537 QSO 10 02 19.4934123935 +01 55 37.012286303   21.160 21.027   20.410 ~ 42 0
44 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2381 1
45 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1634 2

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2020.07.04-02:40:09

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