J/ApJ/897/18 Swift UVOT observation of the radio quasar 3C 273 (Li+, 2020)
Untangling Optical Emissions of the Jet and Accretion Disk in the Flat-spectrum
Radio Quasar 3C 273 with Reverberation Mapping Data.
Li Y.-R., Zhang Z.-X., Jin C., Du Pu, Cui L., Liu X., Wang J.-M.
<Astrophys. J., 897, 18 (2020)>
=2020ApJ...897...18L 2020ApJ...897...18L
ADC_Keywords: QSOs; Photometry, UBV; Photometry, ultraviolet
Keywords: Active galaxies ; Quasars ; Reverberation mapping ; Radio galaxies ;
Radio jets
Abstract:
3C273 is an intensively monitored flat-spectrum radio quasar with both
a beamed jet and blue bump together with broad emission lines. The
coexistence of the comparably prominent jet and accretion disk leads
to complicated variability properties. Recent reverberation mapping
monitoring for 3C273 revealed that the optical continuum shows a
distinct long-term trend that does not have a corresponding echo in
the Hβ fluxes. We compile multiwavelength monitoring data from
the Swift archive and other ground-based programs and clearly find two
components of emissions at optical wavelength. One component stems
from the accretion disk itself, and the other component can be
ascribed to the jet contribution, which also naturally accounts for
the nonechoed trend in reverberation mapping data. We develop an
approach to decouple the optical emissions from the jet and accretion
disk in 3C273 with the aid of multiwavelength monitoring data. By
assuming that the disk emission has a negligible polarization in
consideration of the low inclination of the jet, the results show that
the jet contributes a fraction of ∼10% at the minimum and up to ∼40%
at the maximum to the total optical emissions. This is the first time
to provide a physical interpretation of the "detrending" manipulation
conventionally adopted in reverberation mapping analysis. Our work
also illustrates the importance of appropriately analyzing variability
properties in cases of coexisting jets and accretion disks.
Description:
We used the High Energy Astrophysics Science Archive Research Center
(HEASARC) data archive to search for previous Swift observations of
3C273 and download the data. We found 322 observations between 2004
December 13 and 2019 April 9, including 312 observations with
exposures in both the X-ray Telescope and the Ultraviolet/Optical
Telescope (UVOT). Observations in the UVOT grism mode were excluded
because we only wanted to use the six UVOT photometric bands.
Objects:
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RA (2000) DE Designation(s)
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12 29 06.70 +02 03 08.6 3C 273 = 3C 273
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 94 285 Swift UVOT data of 3C 273
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See also:
J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)
J/MNRAS/392/1181 : BV(RI)c photometry of 3C 273 (Dai+, 2009)
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)
J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009)
J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)
J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)
J/ApJ/795/149 : Reverberation mapping of Seyfert 1 NGC 7469 (Peterson+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)
J/ApJ/825/126 : SEAMBHs. V. The third year (Du+, 2016)
J/ApJ/846/98 : Jet kinematics of blazars at 43GHz with VLBA (Jorstad+, 2017)
J/A+A/601/A35 : High-fidelity VLA imaging of 3C273 (Perley+, 2017)
J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)
J/A+A/620/A68 : Polarization of quasars (Hutsemekers+, 2018)
J/ApJ/870/123 : Swift optical & UV flux of four AGNs (Edelson+, 2019)
J/A+A/623/A111 : 3C273 polarization over ALMA 1.3mm band (Hovatta+, 2019)
J/ApJ/876/49 : A 10yr reverberation mapping campaign for 3C273 (Zhang+, 2019)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 d JD [3562/8583] Julian Date; JD-2450000
12- 17 F6.3 10-14cW/m2/nm FUVW2 [0.07/21.2]? Flux density in UVW2 filter
19- 24 F6.3 10-14cW/m2/nm e_FUVW2 [0.003/0.7]? Uncertainty in FUVW2
26- 31 F6.3 10-14cW/m2/nm FUVM2 [0.42/17.7]? Flux density in UVM2 filter
33- 38 F6.3 10-14cW/m2/nm e_FUVM2 [0.01/0.4]? Uncertainty in FUVM2
40- 45 F6.3 10-14cW/m2/nm FUVW1 [8.13/14.5]? Flux density in UVW1 filter
47- 52 F6.3 10-14cW/m2/nm e_FUVW1 [0.3/0.6]? Uncertainty in FUVW1
54- 59 F6.3 10-14cW/m2/nm FU [5.11/8.73]? Flux density in U filter
61- 66 F6.3 10-14cW/m2/nm e_FU [0.14/6.97]? Uncertainty in FU
68- 73 F6.3 10-14cW/m2/nm FB [3.1/5.01]? Flux density in B filter
75- 80 F6.3 10-14cW/m2/nm e_FB [0.07/0.13]? Uncertainty in FB
82- 87 F6.3 10-14cW/m2/nm FV [2.08/3.55]? Flux density in V filter
89- 94 F6.3 10-14cW/m2/nm e_FV [0.05/0.14]? Uncertainty in FV
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 24-Sep-2021