2006A&A...451..435M


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.30CEST18:35:02

2006A&A...451..435M - Astronomy and Astrophysics, volume 451, 435-442 (2006/5-4)

The intra-night optical variability of the bright BL Lacertae object S5 0716+714.

MONTAGNI F., MASELLI A., MASSARO E., NESCI R., SCLAVI S. and MAESANO M.

Abstract (from CDS):

We address the topic of the intra-night optical variability of the BL Lac object S5 0716+714. To this purpose a long-term observational campaign was carried out, from 1996 to 2003, which allowed the collection of a very large data set, containing 10675 photometric measurements obtained in 102 nights. The source brightness varied in a range of about 2mag, although the majority of the observations were performed when it was in the range 13.0<R<13.75. Variability time scales were estimated from the rates of magnitude variation, which were found to have a distribution function well fitted by an exponential law with a mean value of 0.027mag/h, corresponding to an e-folding time scale of the flux τF=37.6h. The highest rates of magnitude variation were around 0.10-0.12mag/h and lasted less than 2h. These rates were observed only when the source had an R magnitude <13.4, but this finding cannot be considered significant because of the low statistical occurrence. The distribution of τF has a well-defined modal value at 19 h. Assuming the recent estimate of the beaming factor δ∼20, we derived a typical size of the emitting region of about 5x1016/(1+z)cm. The possibility of searching for a possible correlation between the mean magnitude variation rate and the long-term changes in the velocity of the superluminal components in the jet is discussed.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: BL Lacertae objects: individual: S5 0716+714

VizieR on-line data: <Available at CDS (J/A+A/451/435): table2.dat tablea1.dat>

Simbad objects: 7

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Number of rows : 7

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 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1397 2
2 TYC 4368-1025-1 * 07 21 33.3736190548 +71 19 21.094004835   11.90 11.31 11.12 10.92 ~ 7 0
3 [GVR97] S5 0716+714 B * 07 21 52.3287265943 +71 18 17.713038034   13.04 12.43   11.79 ~ 10 0
4 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1136 1
5 [GVR97] S5 0716+714 C * 07 21 54.3629174368 +71 19 20.917010061   14.15 13.55   12.85 ~ 13 0
6 [GVR97] S5 0716+714 D * 07 22 12.6268567982 +71 21 14.800549463   14.24 13.63   12.97 ~ 8 0
7 6C 095456+654857 BLL 09 58 47.2452838930 +65 33 54.821524491     17.0 15.75   ~ 621 1

    Equat.    Gal    SGal    Ecl

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2020.09.30-18:35:02

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