2011A&A...528A..95G

Query : 2011A&A...528A..95G

2011A&A...528A..95G - Astronomy and Astrophysics, volume 528A95-95 (2011/4-1)

The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region.

GU M.-F. and AI Y.L.

Abstract (from CDS):

Although a bluer-when-brighter trend is commonly observed in blazars, the opposite trend of redder-when-brighter has also been found in some blazars. We investigate the frequency of the redder-when-brighter trend in flat-spectrum radio quasars (FSRQs). We investigate the optical variability of 29 FSRQs in the SDSS Stripe 82 region using SDSS DR7 released multi-epoch data covering about nine years. We determined the spectral index by fitting a powerlaw to SDSS ugriz photometric data, and explored the relationship between the spectral index and source brightness. For all FSRQs studied, we detect variations in r band flux of overall amplitude between 0.24 mag and 3.46 mag in different sources. Fourteen of 29 FSRQs display a bluer-when-brighter trend. However, only one source exhibits a redder-when-brighter trend, which implies that this behavior is rare in our FSRQ sample. In this source, the thermal emission from the accretion disk may be responsible for the redder-when-brighter trend.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - quasars: general - galaxies: photometry

Simbad objects: 50

goto Full paper

goto View the references in ADS

Number of rows : 50
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [VV2006] J001130.4+005751 Bla 00 11 30.40320483 +00 57 51.8770044   18.55 18.16 20.06   ~ 117 1
2 QSO B0013-005 Bla 00 16 11.08855044 -00 15 12.4454125   20.44 19.98 19.72   ~ 171 1
3 SDSS J002509.66-004030.9 QSO 00 25 09.6617130144 -00 40 31.007269308   19.60 19.40     ~ 24 1
4 ICRF J003443.9-005413 Sy1 00 34 43.9220023032 -00 54 13.028926320   19.57 19.52     ~ 38 1
5 SDSS J003512.90+010430.6 QSO 00 35 12.9092627352 +01 04 30.697878360   20.76 20.52     ~ 25 1
6 QSO B0041+001 Bla 00 43 32.7108513744 +00 24 59.858379792   19.52 19.26 19.3   ~ 43 1
7 QSO B0045-000 QSO 00 48 19.1211502872 +00 14 57.132827664   20.23 20.00     ~ 40 1
8 LBQS 0049+0019A QSO 00 52 05.5690063368 +00 35 38.149368180   16.54 16.22     ~ 58 1
9 QSO B0054-0040 Bla 00 57 17.00220926 -00 24 33.1774397   19.38 19.16 19.2   ~ 91 1
10 [VV2006] J011129.9+003431 QSO 01 11 29.9470813584 +00 34 31.372255956   18.8 19.25 18.4   ~ 37 1
11 SDSS J012401.76+003500.9 QSO 01 24 01.7641576440 +00 35 00.937932036   20.98 20.74     ~ 34 1
12 4C -00.10 Bla 01 25 17.1506405376 -00 18 28.907967636   18.73 18.60 18.4   ~ 93 1
13 QSO J0125-0006 Bla 01 25 28.8438355224 -00 05 55.930595964   16.92 16.64 16.30   ~ 305 1
14 SDSS J012753.69+002516.4 QSO 01 27 53.6984800440 +00 25 16.526175600   20.72 20.61 20.7   ~ 30 1
15 ICRF J015243.1+002039 Sy1 01 52 43.14997065 +00 20 39.7114838   20.98 20.72     ~ 43 1
16 [VV2006] J015454.3-000723 QSO 01 54 54.3652528176 -00 07 23.243903184   19.73 19.53     ~ 39 1
17 SDSS J015832.51-004238.1 QSO 01 58 32.5209381504 -00 42 38.246092848   19.45 19.34     ~ 30 1
18 [VV2006] J021728.6-005227 QSO 02 17 28.6363613880 -00 52 27.210228132   20.36 20.08     ~ 36 1
19 QSO B0222+000 BLL 02 25 08.0769697320 +00 17 07.254982680   18.93 18.59     ~ 53 1
20 [VV2006] J023105.6+000845 QSO 02 31 05.5978276440 +00 08 43.659129804   20.00 19.74     ~ 31 1
21 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
22 SDSS J025515.09+003740.5 QSO 02 55 15.096 +00 37 40.53   20.53 20.15     ~ 22 0
23 QSO B0420-0127 Bla 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1263 3
24 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1388 1
25 QSO J0738+1742 BLL 07 38 07.39375312 +17 42 18.9981506   16.76 16.22 15.78   ~ 1045 1
26 QSO B0736+01 Bla 07 39 18.03389906 +01 37 04.6177501   16.90 16.47 16.19   ~ 738 1
27 QSO J0948+0022 Bla 09 48 57.32005819 +00 22 25.5596984   18.85 18.61 18.17   ~ 350 2
28 Ton 599 Bla 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 989 1
29 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1409 1
30 QSO J1626-2951 Bla 16 26 06.02084013 -29 51 26.9712990   18.41 20.5 17.6   ~ 452 1
31 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
32 QSO B2134+0028 Bla 21 36 38.58632232 +00 41 54.2128562   17.30 17.08 17.02   ~ 580 2
33 BWE 2151+0016 QSO 21 53 49.7333 +00 31 19.355   22.04 21.20     ~ 19 1
34 SDSS J221001.81-001309.6 QSO 22 10 01.8196052016 -00 13 09.715786428   20.66 20.27     ~ 24 1
35 [VV2006] J221806.7+005223 QSO 22 18 06.6769100688 +00 52 23.619756972   18.06 17.78     ~ 42 0
36 SDSS J222235.84+001536.3 QSO 22 22 35.8493158944 +00 15 36.313988328   20.74 20.35     ~ 25 1
37 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 863 1
38 4C 00.81 Bla 22 26 46.53701435 +00 52 11.3314982   21.64 20.97 19.62   ~ 93 1
39 SDSS J222713.23-005041.4 QSO 22 27 13.2315786096 -00 50 41.486867664   21.12 20.66     ~ 19 0
40 FBQS J2227+0034 QSO 22 27 44.5842030480 +00 34 50.857844844   20.46 20.20     ~ 27 0
41 4C 11.69 Bla 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1205 2
42 SDSS J224146.37+001608.0 Sy1 22 41 46.3772282496 +00 16 08.012865000   20.64 20.38     ~ 22 1
43 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
44 AT20G J231222-010925 QSO 23 12 22.3609 -01 09 24.714   21.68 21.01     ~ 35 1
45 [VV2006] J232038.0+003138 Bla 23 20 37.9916312304 +00 31 39.713608848   20.03 19.70 18.8   ~ 44 1
46 SDSS J232659.09-002352.3 QSO 23 26 59.0936878584 -00 23 52.329191460   21.41 21.21     ~ 24 1
47 [VV2006] J232734.7+002234 QSO 23 27 34.7389887480 +00 22 34.061397168   19.15 18.81 18.24 18.36 ~ 43 1
48 QSO J2340-0053 QSO 23 40 23.6700032496 -00 53 27.001299696   18.26 17.93     ~ 109 1
49 LBQS 2351-0036 Bla 23 54 09.1759863576 -00 19 47.954748072   18.80 18.48 18.1   ~ 117 1
50 [VV96] J235936.8-003112 QSO 23 59 36.82109 -00 31 12.8619   20.63 20.22     ~ 29 1

To bookmark this query, right click on this link: simbad:objects in 2011A&A...528A..95G and select 'bookmark this link' or equivalent in the popup menu