J/ApJ/884/103 Medium-band photometry RM of 5 nearby AGNs (Kim+, 2019)
Medium-band photometry reverberation mapping of nearby active galactic nuclei.
Kim J., Im M., Choi C., Hwang S.
<Astrophys. J., 884, 103 (2019)>
=2019ApJ...884..103K 2019ApJ...884..103K
ADC_Keywords: Active gal. nuclei; Photometry, H-alpha
Keywords: Active galactic nuclei; Reverberation mapping; Time series analysis;
Medium band photometry
Abstract:
Reverberation mapping (RM) is one of the most efficient ways to
investigate the broad-line region around the central supermassive
black holes of active galactic nuclei (AGNs). A common way of
performing the RM is to perform a long term spectroscopic monitoring
of AGNs, but the spectroscopic monitoring campaign of a large number
of AGNs requires an extensive amount of observing time of medium to
large size telescopes. As an alternative way, we present the results
of photometric RM with medium-band photometry. As the widths of
medium-band filters match well with the widths of AGN broad emission
lines, the medium-band observation with small telescopes can be a
cost-effective way to perform RM. We monitored five nearby AGNs with
available spectroscopic RM results showing days to weeks scale
variability. Observations were performed for ∼3 months with an average
of 3 days cadence using three medium-band filters on a 0.43m
telescope. The time lags between the continuum and the Hα
emission line light curves are calculated using the JAVELIN software
and the discrete correlation function. We find time lags of 1.5-15.9d
for these AGNs, which are consistent with the time lags derived from
previous spectroscopic RM measurements. This result demonstrates that
even a 0.5m class telescope can perform RM with medium-bands.
Furthermore, we show that RM for tens of thousands AGNs is possible
with a dedicated 1m class telescope.
Description:
For the medium-band photometric reverberation mapping (RM), we used
the 0.43m Lee Sang Gak Telescope (LSGT) and its imaging camera,
SNUCAM-II (wavelength range 400-1050nm) at the Siding Spring
Observatory (SSO).
We observed five nearby AGNs, Mrk 1310, NGC 4593, NGC 4748, NGC 6814,
and NGC 7469 using three medium-bands, m625 (596.2-658.7nm), m675
(643.3-712.0nm), and m725 (693.6-754.8nm).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 5 List of the monitored AGNs
table2.dat 122 175 The continuum and the Hα emission line
light curve of five nearby AGNs
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See also:
III/88 : Stellar Spectrophotometric Atlas (Gunn+ 1983)
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)
J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)
J/ApJ/756/73 : gri LCs of the low-luminosity AGN NGC 4395 (Edri+, 2012)
J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)
J/ApJ/795/149 : Reverberation mapping of NGC 7469 (Peterson+, 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/ApJ/801/45 : QSO properties and reverberation mapping (Hernitschek+, 2015)
J/ApJ/806/109 : Rest-frame optical spectra of 3<z<6 QSOs (Jun+, 2015)
J/ApJS/216/17 : AKARI 2.5-5um spectra of nearby Type-1 AGNs (Kim+, 2015)
J/ApJ/818/30 : Lag measurements for 15 z<0.8 QSOs from SDSS-RM (Shen+, 2016)
J/ApJ/840/97 : Opt. reverberation mapping of 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)
J/ApJ/865/56 : Emission line & R-band continuum LCs of 17 QSOs (Lira+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name AGN name
9- 10 I2 h RAh Hour of right ascension (J2000)
12- 13 I2 min RAm Minute of right ascension (J2000)
15- 18 F4.1 s RAs Second of right ascension (J2000)
20 A1 --- DE- Sign of declination (J2000)
21- 22 I2 deg DEd Degree of declination (J2000)
24- 25 I2 arcmin DEm Arcminute of declination (J2000)
27- 30 F4.1 arcsec DEs Arcsecond of declination (J2000)
32- 36 F5.2 mag Vmag [12.34/15.89] V magnitude
38 A1 --- r_Vmag Reference for Vmag (1)
40- 44 F5.3 --- z [0.005/0.019] Redshift
46- 47 I2 --- Nep [28/53] Number of epochs
49- 51 F3.1 d Time [2/3.4] Average time spacing
53- 62 A10 "date" Start Monitoring start
63 A1 --- --- [-]
64- 68 A5 --- End Monitoring end (Month and Day)
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Note (1): Reference as follows:
a = Veron-Cetty & Veron (2010, VII/258).
b = Gil de Paz et al. (2007, J/ApJS/173/185).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 -- Name AGN name
8- 22 F15.4 d MJD [57873.4/58006.4] Modified Julian date
of observation
23- 32 F10.4 mag m625mag [13.14/15.2] Apparent AB magnitude
in LSGT/SNUCAM m625 band (596.2-658.7nm)
33- 42 F10.4 mag e_m625mag [0.0013/0.03] Uncertainty in m625mag
43- 52 F10.4 mag m675mag [11.68/14.86] Apparent AB magnitude
in LSGT/SNUCAM m675 band (643.3-712.0nm)
53- 62 F10.4 mag e_m675mag [0.001/0.022] Uncertainty in m675mag
63- 72 F10.4 mag m725mag [12/15.1] Apparent AB Magnitude
in LSGT/SNUCAM m725 band (693.6-754.8nm)
73- 82 F10.4 mag e_m725mag [0.0013/0.03] Uncertainty in m725mag
83- 92 F10.4 cJy Cont [0.38/4.41] The 675nm continuum flux (1)
93-102 F10.4 cJy e_Cont [0.004/0.07] Uncertainty in Cont (1)
103-112 F10.4 cJy Ha [0.08/4.5] Hα flux (1)
113-122 F10.4 cJy e_Ha [0.0028/0.04] Uncertainty in Ha (1)
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Note (1): In units of 10-25erg/s/cm2/Hz (observed frame).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Mar-2021