J/ApJ/788/159 17 Seyfert 1 galaxies light curves (Koshida+, 2014)
Reverberation measurements of the inner radius of the dust torus in 17 Seyfert
galaxies.
Koshida S., Minezaki T., Yoshii Y., Kobayashi Y., Sakata Y., Sugawara S.,
Enya K., Suganuma M., Tomita H., Aoki T., Peterson B.A.
<Astrophys. J., 788, 159 (2014)>
=2014ApJ...788..159K 2014ApJ...788..159K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Galaxies, Seyfert ; Redshifts ;
Photometry, VRI ; Photometry, infrared
Keywords: dust, extinction - galaxies: active - galaxies: Seyfert -
infrared: galaxies
Abstract:
We present the results of a dust reverberation survey for 17 nearby
Seyfert 1 galaxies, which provides the largest homogeneous data
collection for the radius of the innermost dust torus. A delayed
response of the K-band light curve after the V-band light curve was
found for all targets, and 49 measurements of lag times between the
flux variation of the dust emission in the K band and that of the
optical continuum emission in the V band were obtained by the
cross-correlation function analysis and also by an alternative method
for estimating the maximum likelihood lag. The lag times strongly
correlated with the optical luminosity in the luminosity range of
MV=-16 to -22 mag, and the regression analysis was performed to
obtain the correlation log Δt (days)=-2.11 -0.2 MV assuming
Δt∝L0.5, which was theoretically expected. We discuss
the possible origins of the intrinsic scatter of the dust
lag-luminosity correlation, which was estimated to be approximately
0.13 dex, and we find that the difference of internal extinction and
delayed response of changes in lag times to the flux variations could
have partly contributed to intrinsic scatter. However, we could not
detect any systematic change of the correlation with the subclass of
the Seyfert type or the Eddington ratio. Finally, we compare the dust
reverberation radius with the near-infrared interferometric radius of
the dust torus and the reverberation radius of broad Balmer emission
lines. The interferometric radius in the K band was found to be
systematically larger than the dust reverberation radius in the same
band by the about a factor of two, which could be interpreted by the
difference between the flux-weighted radius and response-weighted
radius of the innermost dust torus. The reverberation radius of the
broad Balmer emission lines was found to be systematically smaller
than the dust reverberation radius by about a factor of four to five,
which strongly supports the unified scheme of the Seyfert type of
active galactic nuclei (AGNs). Moreover, we examined the radius-luminosity
correlations for the hard X-ray (14-195 keV) and the [O IV]
λ25.89 µm emission-line luminosities, which would be
applicable for obscured AGNs.
Description:
Monitoring observations were conducted by using the multicolor imaging
photometer (MIP) mounted on the MAGNUM telescope (Kobayashi et al.
1998SPIE.3352..120K 1998SPIE.3352..120K, 1998SPIE.3354..769K 1998SPIE.3354..769K). The MIP has a field of view
of 1.5x1.5 arcmin2; it is capable of simultaneously obtaining
images in optical (U, B, V, R, and I) and near-infrared (J, H, and K)
bands by splitting the incident beam into two different detectors
including an SITe CCD (1024x1024 pixels, 0.277 arcsec/pixel) and an
SBRC InSb array (256x256 pixels, 0.346 arcsec/pixel). Monitoring
observations with the MAGNUM telescope began in 2001-2003, although
that for NGC 3516 and NGC 4593 began in 2005. We present the data obtained
through 2006-2007 to include monitoring spans of three to seven yr.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 81 17 List of Target Active Galactic Nuclei
table4.dat 40 3925 Light curve data
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See also:
VII/224 : Quasars and Active Galactic Nuclei (10th Ed.) (Veron+ 2001)
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
J/ApJS/141/31 : JHK' imaging photometry of Seyfert 1. II. (Enya+, 2002)
J/ApJ/613/682 : AGN central masses and broad-line region sizes
(Peterson+, 2004)
J/AJ/143/83 : Properties of a sample of Seyfert 1 galaxies (Xu+, 2012)
J/ApJ/755/60 : Reverberation mapping for five Seyfert 1 galaxies
(Grier+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name Target AGN name
17- 18 I2 h RAh Hour of Right Ascension (J2000)
20- 21 I2 min RAm Minute of Right Ascension (J2000)
23- 26 F4.1 s RAs Second of Right Ascension (J2000)
28 A1 --- DE- Sign of the Declination (J2000)
29- 30 I2 deg DEd Degree of Declination (J2000)
32- 33 I2 arcmin DEm Arcminute of Declination (J2000)
35- 38 F4.1 arcsec DEs Arcsecond of Declination (J2000)
40- 43 F4.2 arcmin MajDiam Major diameter taken from the NED
45- 48 F4.2 arcmin MinDiam Minor diameter taken from the NED
50- 55 F6.4 --- z Redshift
57- 62 F6.2 mag VMag V-band absolute magnitude (1)
64- 66 F3.1 --- Type [1/1.8] Seyfert type of AGN
68 I1 --- Ref ? [1/2] Type reference (2)
70- 73 A4 [Msun] logM Log of mass accretion rate: log(MBH/M☉)
75- 78 F4.2 [Msun] e_logM ? Uncertainty in logM
81 I1 --- Ref1 ? [3/7] logM reference (3)
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Note (1): Reported by Veron-Cetty & Veron (2001A&A...374...92V 2001A&A...374...92V, Cat. VII/224).
Note (2): Reference as follows:
1 = Osterbrock & Martel 1993ApJ...414..552O 1993ApJ...414..552O;
2 = Veron-Cetty & Veron 2010A&A...518A..10V 2010A&A...518A..10V, Cat. VII/258.
Note (3): Reference as follows:
3 = Grier et al. 2012ApJ...755...60G 2012ApJ...755...60G;
4 = Peterson et al. 2004, J/ApJ/613/682;
5 = Denney et al. 2010ApJ...721..715D 2010ApJ...721..715D;
6 = Bentz et al. 2006ApJ...651..775B 2006ApJ...651..775B;
7 = Bentz et al. 2007ApJ...662..205B 2007ApJ...662..205B.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name Target AGN name
17 A1 --- Band [VK] Observing band
19- 26 F8.2 d MJD Observation date
28- 33 F6.2 mJy Flux Flux in Band (1)
35- 40 F6.2 mJy e_Flux Error in Flux
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Note (1): Correction for the Galactic extinction has not been applied to the
light curves, and the fluxes from the host galaxy and narrow emission
lines have not been subtracted.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 18-Jul-2017