J/ApJ/891/68 MgII, FeII & 3000Å continuum LCs of CTA102 (Chavushyan+, 2020)
Flare-like variability of the MgIIλ2798Å emission line and UV FeII
band in the blazar CTA 102.
Chavushyan V., Patino-Alvarez V.M., Amaya-Almazan R.A., Carrasco L.
<Astrophys. J., 891, 68-68 (2020)>
=2020ApJ...891...68C 2020ApJ...891...68C (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei; Spectra, ultraviolet
Keywords: Active galaxies; Blazars; Emission line galaxies; Relativistic jets
Gamma-ray astronomy
Abstract:
We report on the detection of a statistically significant flare-like
event in the MgIIλ2798Å emission line and the UV FeII band
of CTA 102 during the outburst of fall 2017. The ratio between the
maximum and minimum of λ3000Å continuum flux for the
observation period (2010-2017) is 179±15. Respectively, the max/min
ratios 8.1±10.5 and 34.0±45.5 confirmed the variability of the
MgII emission line and of the FeII band. The highest levels of
emission line fluxes recorded coincide with a superluminal jet
component traversing through a stationary component located ∼0.1mas
from the 43GHz core. Additionally, comparing the MgII line profile in
the minimum of activity against the one in the maximum, we found that
the latter is broader and blueshifted. As a result of these findings,
we can conclude that the non-thermal continuum emission produced by
material in the jet moving at relativistic speeds is related to the
broad emission line fluctuations. Consequently, these fluctuations are
also linked to the presence of broad-line region (BLR) clouds located
∼25pc from the central engine, outside the inner parsec, where the
canonical BLR is located. Our results suggest that during strong
activity in CTA 102, the source of non-thermal emission and broad-line
clouds outside the inner parsec introduces uncertainties in the
estimates of black hole (BH) mass. Therefore, it is important to
estimate the BH mass, using single-epoch or reverberation mapping
techniques, only with spectra where the continuum luminosity is
dominated by the accretion disk.
Description:
For the analyses performed in this work, we used 271 optical spectra
of CTA102 observed in different epochs (between September 2010 and
July 2018), calibrated against the V-band magnitude taken from the
Ground-based Observational Support of the Fermi Gamma-ray Space
Telescope at the University of Arizona monitoring program:
http://james.as.arizona.edu/~psmith/Fermi/
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
22 32 36.41 +11 43 50.9 CTA 102 = 4C 11.69
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 271 Flux measurements for the MgIIλ2798Å
emission line, the FeII UV band, and
the λ3000Å continuum
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See also:
J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)
J/AJ/134/799 : Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)
J/A+A/486/99 : Long-term spectral variability of NGC 4151 (Shapovalova+, 2008)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJ/748/49 : Optical spectroscopy of 1LAC broad-line blazars (Shaw+, 2012)
J/ApJ/763/L36 : MgII and FeII flux of the blazar 3C 454.3 (Leon-Tavares+, 2013)
J/A+A/551/A32 : Catching the radio flare in CTA 102 (Fromm+, 2013)
J/ApJ/813/51 : γ-ray to IR study of the blazar CTA 102 (Casadio+, 2015)
J/ApJ/846/98 : Jet kinematics of blazars at 43GHz with VLBA (Jorstad+, 2017)
J/ApJ/880/46 : Spectroscopy & V-band monitoring of CTS C30.10 (Czerny+, 2019)
J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)
http://james.as.arizona.edu/~psmith/Fermi/ : Fermi monitoring program data
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 d JD [5443.93/8306.89] Julian Date of
observation; JD-2450000
9- 12 F4.2 10-16W/m2 MgII [0.69/5.57] MgII 2798 flux
in 10-13erg/s/cm2 units
14- 17 F4.2 10-16W/m2 e_MgII [0.04/7] Uncertainty in MgII
19- 22 F4.2 10-16W/m2 FeII [0.23/7.7] UV FeII flux
in 10-13erg/s/cm2 units
24- 27 F4.2 10-16W/m2 e_FeII [0.04/10] Uncertainty in FeII
29- 34 F6.2 10-17W/m2/nm Cont [3/560] Continuum (3000Å) flux
in 10-15erg/s/cm2/Å units
36- 40 F5.2 10-17W/m2/nm e_Cont [0.1/22.1] Uncertainty in Cont
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 06-Aug-2021