J/ApJ/869/142 Monitoring AGNs with Hβ Asymmetry (MAHA). I. (Du+, 2018)
Monitoring AGNs with Hβ Asymmetry.
I. First results: velocity-resolved reverberation mapping.
Du P, Brotherton M.S., Wang K., Huang Z.-P., Hu C., Kasper D.H., Chick W.T.,
Nguyen My L., Maithil J., Hand D., Li Y.-R., Ho L.C., Bai J.-M., Bian W.-H.,
Wang J.-M.
<Astrophys. J., 869, 142 (2018)>
=2018ApJ...869..142D 2018ApJ...869..142D
ADC_Keywords: Active gal. nuclei; Spectra, optical; Redshifts
Keywords: galaxies: active ; galaxies: nuclei ;
quasars: supermassive black holes
Abstract:
We have started a long-term reverberation mapping (RM) project using
the Wyoming Infrared Observatory 2.3m telescope titled "Monitoring
AGNs with Hβ Asymmetry" (MAHA). The motivations of the project
are to explore the geometry and kinematics of the gas responsible for
complex Hβ emission-line profiles, ideally leading to an
understanding of the structures and origins of the broad-line region
(BLR). Furthermore, such a project provides the opportunity to search
for evidence of close binary supermassive black holes. We describe
MAHA and report initial results from our first campaign, from 2016
December to 2017 May, highlighting velocity-resolved time lags for
four active galactic nuclei (AGNs) with asymmetric Hβ lines. We
find that 3C120, Ark120, and Mrk6 display complex features different
from the simple signatures expected for pure outflow, inflow, or a
Keplerian disk. While three of the objects have been previously
reverberation mapped, including velocity-resolved time lags in the
cases of 3C120 and Mrk6, we report a time lag and corresponding black
hole mass measurement for SBS1518+593 for the first time. Furthermore,
SBS1518+593, the least asymmetric of the four, does show
velocity-resolved time lags characteristic of a Keplerian disk or
virialized motion more generally. Also, the velocity-resolved time
lags of 3C120 have significantly changed since previously observed,
indicating an evolution of its BLR structure. Future analyses of the
data for these objects and others in MAHA will explore the full
diversity of Hβ lines and the physics of AGN BLRs.
Description:
In this paper, we describe the "Monitoring AGNs with Hβ
Asymmetry" (MAHA) project and report some results from the first
campaign. We successfully obtained the Hβ time lags of four
objects observed from 2016 December to 2017 May.
We obtained spectroscopic data using the 2.3m telescope at the Wyoming
Infrared Observatory (WIRO) and its long slit spectrograph (wavelength
coverage of 4000-7000Å), observing remotely from the University of
Wyoming campus.
We did not conduct our own photometric observations during 2016-2017
in our campaign. However, because the objects of this paper are bright
enough, we can find their photometric light curves from archival data
from the All-Sky Automated Survey for Supernovae (ASAS-SN).
See Section 3 for further explanations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 47 4 Featured targets
table3.dat 47 114 Light curves
table6.dat 92 4 Hβ width measurements and black hole masses
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/ApJS/145/199 : Optical spectroscopic atlas low-redshift AGN (Marziani+,2003)
J/A+A/422/925 : Profile variability in lines of NGC 5548 (Shapovalova+ 2004)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+,2004)
J/ApJ/687/78 : FeII emission in quasars (Hu+, 2008)
J/ApJ/683/L115 : Intermediate-line region in quasars (Hu+, 2008)
J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009)
J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)
J/ApJ/732/121 : V-band and Hβ monitoring of Z299-15 (Barth+, 2011)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/MNRAS/426/416 : Mrk 6 Hα, Hβ & Hγ spectra (Doroshenko+,2012)
J/ApJS/201/23 : Spectroscopy of 88 z<0.7 SDSS QSOs (Eracleous+, 2012)
J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)
J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)
J/MNRAS/431/836 : Type 1 AGN at low z. III. (Stern+, 2013)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, & IRAS F12397+3333 (Du+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJ/793/108 : SEAMBHs. II. Continuum and Hbeta LCs (Wang+, 2014)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJ/806/22 : SEAMBHs IV. Hβ time lags (Du+, 2015)
J/ApJS/225/29 : NGC 5548 43 year-long monitoring in Hβ (Bon+, 2016)
J/ApJ/825/126 : SEAMBHs. V. The third year (Du+, 2016)
J/ApJ/831/7 : SDSS-RM project: peak velocities of QSOs (Shen+, 2016)
J/ApJ/818/30 : Lag measurements 15 z<0.8 QSOs from the SDSS-RM (Shen+, 2016)
J/ApJ/840/97 : Optical reverberation map campaign 5 AGNs (Fausnaugh+, 2017)
J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)
J/ApJ/856/6 : SEAMBHs IX. 10 new Hβ light curves (Du+, 2018)
http://www.astronomy.ohio-state.edu/asassn : All-Sky Automated Survey for
Supernovae (ASAS-SN) home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1-12 A12 --- Name AGN name
14-15 I2 h RAh Hour of right ascension (J2000)
17-18 I2 min RAm Minute of right ascension (J2000)
20-23 F4.1 s RAs Second of right ascension (J2000)
25 A1 --- DE- Sign of declination (J2000)
26-27 I2 deg DEd Degree of declination (J2000)
29-30 I2 arcmin DEm Arcminute of declination (J2000)
32-33 I2 arcsec DEs Arcsecond of declination (J2000)
35-40 F6.4 --- z [0.01/0.08] Redshift
42-43 I2 --- Nobs [20/45] Number of spectroscopic epochs
45-47 F3.1 d Cad [3.4/6.8] Average sampling interval of the
objects
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name AGN name
14- 21 F8.4 d JD [43/203] Julian Date; JD-2457700
23- 28 F6.3 10-14mW/m2/nm F5100 [1.4/12.6] Continuum flux at 5100Å
(10-15erg/s/cm2/Å)
30- 34 F5.3 10-14mW/m2/nm e_F5100 [0.005/0.3] Uncertainty in F5100
(10-15erg/s/cm2/Å)
36- 41 F6.3 10-13mW/m2 FHb [0.8/11.7] Hβ flux
(10-13erg/s/cm2)
43- 47 F5.3 10-13mW/m2 e_FHb [0.004/0.3] Uncertainty in FHb
(10-13erg/s/cm2)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name AGN name
14- 17 I4 km/s FWHM [3374/6487] FWHM of the Hβ line
in the mean spectra
19- 20 I2 km/s e_FWHM [16/34] FWHM uncertainty
22- 25 I4 km/s Sigma [2429/3929] Hβ line dispersion
in the mean spectra
27- 28 I2 km/s e_Sigma [14/37] Sigma uncertainty
30- 33 I4 km/s FWHMrms [2343/5274] FWHM of the Hβ line
in the rms spectra
35- 36 I2 km/s e_FWHMrms [22/26] FWHMrms uncertainty
38- 41 I4 km/s Sigrms [1038/3300] Hβ line dispersion
in the rms spectra
43- 44 I2 km/s e_Sigrms [20/42] Sigrms uncertainty
46- 50 F5.2 10+7Msun Mvp [4.3/13.4] Virial product
(RHβV2FWHM/G) measured
from the mean spectrum (see Section 4.3)
52- 55 F4.2 10+7Msun e_Mvp [1.1/2.6] Negative uncertainty in Mvp
57- 60 F4.2 10+7Msun E_Mvp [1.3/2.7] Positive uncertainty in Mvp
62- 66 F5.2 10+7Msun Mbh1 [2.4/11.3] Black hole mass
(1.12xRHβV2FWHM/G)
from the rms spectra
68- 71 F4.2 10+7Msun e_Mbh1 [0.5/2] Negative uncertainty in Mbh1
73- 76 F4.2 10+7Msun E_Mbh1 [0.6/2] Positive uncertainty in Mbh1
78- 82 F5.2 10+7Msun Mbh4 [1.8/17.6] Black hole mass
(4.47xRHβσ2line/G)
from the rms spectra
84- 87 F4.2 10+7Msun e_Mbh4 [0.5/2.3] Negative uncertainty in Mbh4
89- 92 F4.2 10+7Msun E_Mbh4 [0.8/2.4] Positive uncertainty in Mbh4
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History:
From electronic version of the journal
References:
Brotherton et al. Paper II. 2020ApJ...905...77B 2020ApJ...905...77B Cat. J/ApJ/905/77
Bao et al. Paper III. 2022ApJS..262...14B 2022ApJS..262...14B Cat. J/ApJS/262/14
Zastrocky et al. Paper IV. 2024ApJS..272...29Z 2024ApJS..272...29Z Cat. J/ApJS/272/29
(End) Prepared by [AAS], Coralie FIX [CDS] 07-Nov-2019