2005A&A...440..855G


Query : 2005A&A...440..855G

2005A&A...440..855G - Astronomy and Astrophysics, volume 440, 855-865 (2005/9-4)

Intra-night optical variability of luminous radio-quiet QSOs.

GUPTA A.C. and JOSHI U.C.

Abstract (from CDS):

We report the detection of intra-night variability in some radio-quiet quasi-stellar objects (RQQSOs) and one lobe-dominated radio-loud quasi-stellar object (LDQ). To study intra-night variability, we carried out photometric monitoring of seven RQQSOs and one LDQ in Johnson V-passband using 1.2 m optical/IR telescope at Gurushikhar, Mount Abu, India. Observations were made in nine nights during the first half of the year 2000; seven RQQSOs: 0748+291, 0945+438, 1017+280, 1029+329, 1101+319, 1225+317, 1252+020 and one LDQ: 1103-006 were observed. RQQSOs 0748+291, 1225+317 and LDQ 1103-006 have shown intra-night variations. In the case of 1017+280 (RQQSO) there is indication of intra-night variation on one night where as the observations on another night do not convincingly show the existence of intra-night variability. RQQSOs 0945+438, 1029+329, 1101+319 and 1252+020 have not shown any intra-night variations. We compiled intra-night variability data for radio-loud and radio-quiet AGNs from the literature for statistical analysis. It is found that some radio-quiet AGNs show intra-night variations with the maximum amplitude of variation being about 10%. On the other hand blazars at times show intra-night flux variability up to 100%. In the case of radio-loud AGNs (excluding blazars), the maximum amplitude of intra-night variation lies between the variability amplitude of radio-quiet AGNs and blazars i.e. the flux variation is close to 50%. The results indicate that the energy generation mechanism and the environment around the central engine in different classes of AGNs may be similar, if not identical. The standard model for radio-loud AGNs, where shocks are propagating down relativistic jets or models based on disturbances in accretion disks can also explain the micro-variability in RQQSOs.

Abstract Copyright:

Journal keyword(s): galaxies: active

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2673 2
2 QSO B0748+295 QSO 07 51 12.3036555000 +29 19 38.279865864   16.28 16.18     ~ 55 0
3 Ton 951 Sy1 08 47 42.4485615096 +34 45 04.482515304   14.83 14.50     ~ 443 0
4 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2161 1
5 Ton 1057 Sy1 09 25 54.7145627448 +19 54 05.064888348   16.02 15.89     ~ 162 0
6 2MASX J09485945+4335187 Sy1 09 48 59.4746090952 +43 35 18.955277736   17.17 16.86     ~ 48 0
7 Ton 34 QSO 10 19 56.5979680488 +27 44 01.738221864   16.06 15.69     ~ 109 0
8 GD 122 WD* 10 32 05.8535765904 +32 40 07.522947732   16.4   16.15   DBAZ4 37 1
9 Ton 52 QSO 11 04 06.9374984688 +31 41 11.527697760   17.46 17.26     ~ 39 0
10 QSO B1103-006 Sy1 11 06 31.7743074480 -00 52 52.380450264   16.39 16.46     ~ 212 1
11 Ton 618 QSO 12 28 24.9659725464 +31 28 37.628987592   16.15 15.87 15.35   ~ 264 1
12 QSO B1252+0200 QSO 12 55 19.7003060256 +01 44 12.243051420   16.29 16.14     ~ 50 0
13 6C 141804+543700 BLL 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 561 1
14 QSO B1514-24 BLL 15 17 41.8134049824 -24 22 19.482207024   15.13 14.00 13.95   ~ 697 3
15 QSO B2155-304 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1639 1
16 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2125 1

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2022.05.24-05:40:48

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