J/ApJ/912/92 Lijiang/YFOSC light curves of NGC 2617 (Feng+, 2021)
Velocity-resolved reverberation mapping of changing-look AGN NGC 2617.
Feng H.-C., Liu H.T., Bai J.M., Yang Z.-X., Hu C., Li S.-S., Yang S.,
Lu K.-X., Xiao M.
<Astrophys. J., 912, 92 (2021)>
=2021ApJ...912...92F 2021ApJ...912...92F
ADC_Keywords: Active gal. nuclei; Photometry; Spectra, optical
Keywords: Active galaxies ; Photometry ; Reverberation mapping ;
Seyfert galaxies ; Spectroscopy ; Supermassive black holes
Abstract:
NGC 2617 attracted a lot of attention after the detection of changes
in its spectral type; the geometry and kinematics of the broad-line
region (BLR) are still ambiguous. In this paper, we present the high
cadence (∼2 days) reverberation mapping campaign of NGC 2617 from
2019-October to 2020-May undertaken at the Lijiang 2.4m telescope. For
the first time, the velocity-resolved reverberation signature of the
object was successfully detected. Both Hα and Hβ show an
asymmetrical profile with a peak in the velocity-resolved time lags.
For both of the lines, the lag of the line core is longer than those
of the relevant wings, and the peak of the velocity-resolved lags is
slightly blueshifted. These characteristics are not consistent with
the theoretical prediction of the inflow, outflow or Keplerian disk
model. Our observations give the time lags of Hα, Hβ,
Hγ, and HeI, with a ratio of τHα:τHβ:
τHγ:τHeI=1.27:1.00:0.89:0.20, which indicates a
stratified structure in the BLR of the object. It is the first time
that the lags of Hα and HeI are obtained. Assuming a virial
factor of f=5.5 for the dispersion width of the line, the masses of
the black holes derived from Hα and Hβ are 23.8-2.7+5.4
and 21.1-4.4+3.8x106M☉, respectively. Our observed results
indicate the complexity of the BLR of NGC 2617.
Description:
The observations of NGC 2617 were carried out from 2019 October to
2020 May using the 2.4m telescope at the Lijiang Observatory of the
Yunnan Observatories, Chinese Academy of Science. 75 photometric data
points and 63 spectroscopic data points were successfully taken with
the Yunnan Faint Object Spectrograph and Camera (YFOSC).
Objects:
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RA (ICRS) DE Designation(s)
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08 35 38.80 -04 05 17.9 NGC 2617 = MCG-01-22-026
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 75 LCs of photometry and lines
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See also:
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJ/840/97 : Opt. reverberation mapping of 5 AGNs (Fausnaugh+, 2017)
J/ApJ/849/161 : BVRI light curves of the BL Lac object Mrk 501 (Feng+, 2017)
J/ApJ/866/133 : Continuum-Hβ light curves of 5 Seyfert 1 (De Rosa+, 2018)
J/ApJ/869/142 : Monitoring AGNs with Hβ Asymmetry (MAHA). I. (Du+, 2018)
J/ApJ/854/107 : Light curves of 2 Seyfert 1 galaxies (Fausnaugh+, 2018)
J/ApJ/880/120 : Phot. of the tidal disruption event PS18kh (Holoien+, 2019)
J/ApJ/883/111 : UV-Opt LCs of ASASSN-19bt detected by TESS (Holoien+, 2019)
J/ApJ/880/155 : RI photometry of blazars S5 0716+714 and 3C 273 (Liu+, 2019)
J/ApJ/883/94 : Optical and UV follow-up of 1ES 1927+654 (Trakhtenbrot+, 2019)
J/ApJ/876/49 : A 10yr reverberation mapping campaign for 3C273 (Zhang+, 2019)
J/ApJ/888/30 : BVRI & spectroscopic light curves of S5 0716+714 (Feng+, 2020)
J/ApJ/890/71 : 5100Å continuum & em. lines LCs of PG2130+099 (Hu+, 2020)
J/ApJ/909/18 : Reverberation mapping monitoring of NGC3516 (Feng+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 d JDph [770.39/977.04] Julian Date of photometry;
JD-2458000
12- 16 F5.3 mag Bmag [2.3/2.53] Apparent Johnson B band magnitude
18- 22 F5.3 mag e_Bmag [0.005/0.02] Uncertainty in Bmag
24- 33 F10.6 d JDsp [779.4/974.06]? Julian Date of spectroscopy;
JD-2458000
35- 39 F5.2 10-14mW/m2 Ha [53/75]? Hα flux, 10-14erg/s/cm2
41- 44 F4.2 10-14mW/m2 e_Ha [1.35/1.36]? Uncertainty in Ha
46- 50 F5.2 10-14mW/m2 Hb [6.9/13.5]? Hβ flux, 10-14erg/s/cm2
52- 55 F4.2 10-14mW/m2 e_Hb [0.44/0.46]? Uncertainty in Hb
57- 60 F4.2 10-14mW/m2 Hg [1/6.3]? Hγ flux, 10-14erg/s/cm2
62- 65 F4.2 10-14mW/m2 e_Hg [0.57]? Uncertainty in Hg
67- 70 F4.2 10-14mW/m2 HeI [1/3.1]? HeI flux, 10-14erg/s/cm2
72- 75 F4.2 10-14mW/m2 e_HeI [0.3/0.43]? Uncertainty in HeI
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Nov-2022