J/ApJS/260/47 19.3yr R-band monitoring of 1ES 2344+514 (Cai+, 2022)
Long-term optical monitoring of the TeV BL Lacertae object 1ES 2344+514.
Cai J.T., Kurtanidze S.O., Liu Y., Kurtanidze O.M., Nikolashvili M.G.,
Xiao H.B., Fan J.H.
<Astrophys. J. Suppl. Ser., 260, 47 (2022)>
=2022ApJS..260...47C 2022ApJS..260...47C
ADC_Keywords: BL Lac objects; Photometry, RI
Keywords: Active galactic nuclei ; CCD photometry ; Quasars
Abstract:
Variability is one of the main observational characteristics of
blazars. Studying variability is an efficient method to reveal the
nature of active galactic nuclei. In the present work, we report
optical R-band photometry observations of a TeV blazar, 1ES2344+514,
carried out with a 70cm telescope in the period of 1998-July to
2017-November at Abastumani Observatory, Georgia. Based on the optical
R-band observations, the optical variation behaviors on both short
timescales and long timescales are investigated. Three methods
(Jurkevich, discrete correlation function, and power spectrum
analysis) are used to investigate periodicity in the light curve. In
addition, combined with multiwavelength data, the jet physical
properties are discussed. The following conclusions are drawn:
(1) A variability of ΔR=0.155mag (15.356-15.201mag) over a
timescale of ΔT=12.99min is detected during our 628d of
monitoring. (2) According to the Kelvin-Helmholtz thermal instability,
if the magnetic field intensity (B) for the source is greater than a
critical value (Bc), it will reduce the incidence of intraday
variations in the light curves. (3) The physical parameters of the
dissipation region are obtained by fitting the spectral energy
distribution with a one-zone synchrotron self-Compton model for the
average and flare states. (4) The three methods show that there are
periods of P=2.72±0.47yr, P=1.61±0.18yr, P=1.31±0.17yr, and
P=1.05±0.07yr. When a binary black hole system is adopted with a
period of P=2.72±0.41yr, we obtain the orbital parameters for the
binary black hole system as follows: M=8.08x109M☉, the sum of
the semiaxes is r=7.18x1016cm, and the lifetime of the binary black
hole is τmerge=6.24x102yr.
Description:
In the present work, we report 19.3yr of observations (1998 July to
2017 November) from the BL Lac object 1ES 2344+514 (z=0.044) at
Abastumani Observatory in Georgia with a 70cm telescope.
Abastumani Observatory is located on top of Mount Kanobili in the
southwestern part of Georgia at an altitude of 1700m above sea level
with latitude and longitude of 41.8051° and 42.8254°,
respectively.
All observations of 1ES 2344+514 were conducted on a 70cm meniscus
telescope (f/3) with an entire FOV of 40x40arcmin2.
Objects:
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RA (ICRS) DE Designation(s)
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23 47 04.84 +51 42 17.9 1ES 2344+514 = QSO B2344+514
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 25 632 Observational data for 1ES 2344+514
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See also:
J/ApJ/537/101 : Optical Study for blazars. I. (Fan+, 2000)
J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)
J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
J/AJ/143/13 : Light curves of AL Gem and BM Mon (Yang+, 2012)
J/other/RAA/14.1135 : Doppler factor for a Fermi blazar sample (Fan+, 2014)
J/other/Nat/515.376 : Power of relativistic jets in blazars (Ghisellini+, 2014)
J/ApJ/810/14 : 3rd cat. of LAT-detected AGNs (3LAC) (Ackermann+, 2015)
J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)
J/ApJ/837/45 : 2006-2012 Rc-band & 4.8GHz obs. of AO 0235+164 (Fan+, 2017)
J/ApJ/835/L38 : Fermi blazars with Doppler factors (Fan+, 2017)
J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)
J/ApJS/235/39 : Jet properties of γ-ray-loud 3FGL AGNs (Chen, 2018)
J/AJ/155/90 : 1996-2009 opt. photometric monitoring for 3C 66A (Fan+, 2018)
J/ApJ/866/137 : Bright blazars variability brightness temp. (Liodakis+, 2018)
J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)
J/ApJS/253/10 : 12yrs of R-band photometry of the quasar 3C 454.3 (Fan+, 2021)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d JD [0.429/7062.22] Julian Date; JD-2451021
12- 18 F7.4 mag Rmag [14.26/14.54] Apparent R band magnitude
20- 25 F6.4 mag e_Rmag [0.0003/0.09] Uncertainty in Rmag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Aug-2022