J/ApJ/821/56 Space telescope RM project. III. NGC 5548 LCs (Fausnaugh+, 2016)
Space telescope and optical reverberation mapping project.
III. Optical continuum emission and broadband time delays in NGC 5548.
Fausnaugh M.M., Denney K.D., Barth A.J., Bentz M.C., Bottorff M.C.,
Carini M.T., Croxall K.V., De Rosa G., Goad M.R., Horne K., Joner M.D.,
Kaspi S., Kim M., Klimanov S.A., Kochanek C.S., Leonard D.C., Netzer H.,
Peterson B.M., Schnulle K., Sergeev S.G., Vestergaard M., Zheng W., Zu Y.,
Anderson M.D., Arevalo P., Bazhaw C., Borman G.A., Boroson T.A.,
Brandt W.N., Breeveld A.A., Brewer B.J., Cackett E.M., Crenshaw D.M.,
Dalla Bonta E., De Lorenzo-Caceres A., Dietrich M., Edelson R.,
Efimova N.V., Ely J., Evans P.A., Filippenko A.V., Flatland K., Gehrels N.,
Geier S., Gelbord J.M., Gonzalez L., Gorjian V., Grier C.J., Grupe D.,
Hall P.B., Hicks S., Horenstein D., Hutchison T., Im M., Jensen J.J.,
Jones J., Kaastra J., Kelly B.C., Kennea J.A., Kim S.C., Korista K.T.,
Kriss G.A., Lee J.C., Lira P., MacInnis F., Manne-Nicholas E.R., Mathur S.,
McHardy I.M., Montouri C., Musso R., Nazarov S.V., Norris R.P.,
Nousek J.A., Okhmat D.N., Pancoast A., Papadakis I., Parks J.R., Pei L.,
Pogge R.W., Pott J.-U., Rafter S.E., Rix H., Saylor D.A., Schimoia J.S.,
Siegel M., Spencer M., Starkey D., Sung H., Teems K.G., Treu T.,
Turner C.S., Uttley P., Villforth C., Weiss Y., Woo J., Yan H., Young S.
<Astrophys. J., 821, 56-56 (2016)>
=2016ApJ...821...56F 2016ApJ...821...56F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI ; Photometry, ugriz ;
Photometry, ultraviolet
Keywords: galaxies: active; galaxies: individual: NGC 5548;
galaxies: nuclei; galaxies: Seyfert
Abstract:
We present ground-based optical photometric monitoring data for
NGC5548, part of an extended multiwavelength reverberation mapping
campaign. The light curves have nearly daily cadence from 2014 January
to July in nine filters (BVRI and ugriz). Combined with ultraviolet
data from the Hubble Space Telescope and Swift, we confirm significant
time delays between the continuum bands as a function of wavelength,
extending the wavelength coverage from 1158Å to the z band
(∼9160Å). We find that the lags at wavelengths longer than the V
band are equal to or greater than the lags of high-ionization-state
emission lines (such as HeIIλ1640 and λ4686), suggesting
that the continuum-emitting source is of a physical size comparable to
the inner broad-line region (BLR). The trend of lag with wavelength is
broadly consistent with the prediction for continuum reprocessing by
an accretion disk with τ∝λ4/3. However, the lags
also imply a disk radius that is 3 times larger than the prediction
from standard thin-disk theory, assuming that the bolometric
luminosity is 10% of the Eddington luminosity (L=0.1LEdd). Using
optical spectra from the Large Binocular Telescope, we estimate the
bias of the interband continuum lags due to BLR emission observed in
the filters. We find that the bias for filters with high levels of BLR
contamination (∼20%) can be important for the shortest continuum lags
and likely has a significant impact on the u and U bands owing to
Balmer continuum emission.
Description:
In conjunction with the HST COS UV RM campaign described in Paper I
(De Rosa+, 2015, J/ApJ/806/128), NGC 5548 was observed between 2013
December and 2014 August by 16 ground-based observatories in optical
broadband filters: Johnson/Cousins BVRI and Sloan Digital Sky Survey
(SDSS) ugriz.
Objects:
---------------------------------------------------
RA (ICRS) DE Designation(s)
---------------------------------------------------
14 17 59.51 +25 08 12.5 NGC 5548 = LEDA 51074
---------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 55 1948 Optical continuum light curves
table4.dat 26 684 HST/COS continuum light curves
--------------------------------------------------------------------------------
See also:
J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)
J/ApJ/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)
J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)
J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)
J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/AJ/128/1761 : HATNET variability survey (Hartman+, 2004)
J/A+A/422/925 : Profile variability in lines of NGC 5548 (Shapovalova+ 2004)
J/A+A/371/79 : NGC 5548 UBVRI phot. and Halpha, Hbeta fluxes (Dietrich+, 2001)
J/PAZh/27/942 : Nuclear activity of NGC 5548 (Doroshenko+, 2001)
J/AJ/116/102 : NGC 5548 BR photometry (Tyson+ 1998)
J/A+A/320/405 : NGC 5548 continuum light curve (Sergeev+ 1997)
J/A+A/314/43 : NGC 5548 Profile variability (Kollatschny+ 1996)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Filt Filter (BVRIugriz)
3- 13 F11.5 d HJD Heliocentric Julian Date; HJD-2400000
15- 21 F7.4 10-17W/m2/nm Flux [8/28] Flux in 10-15erg/cm2/s/Å
23- 28 F6.4 10-17W/m2/nm e_Flux [0.004/2.6] Uncertainty in Flux
30- 35 A6 --- Tel Telescope ID (1)
37- 46 F10.2 ct dCTS [-121380/68575] Differential Counts
48- 55 F8.2 ct e_dCTS [166/41497] Uncertainty in dCTS
--------------------------------------------------------------------------------
Note (1): Telescope used from Tables 1 and 2, as follows:
CrAO = Crimean Astrophysical Observatory (126 rows)
FWO = Fountainwood Observatory (74 rows)
HLCO = Hard Labor Creek Observatory (20 rows)
KAIT = Lick Observatory Katzman Automatic Imaging Telescope (67 rows)
LCOGT1 = Las Cumbres Observatory Global Telescope Network (281 rows)
LCOGT2 = Las Cumbres Observatory Global Telescope Network (45 rows)
LCOGT3 = Las Cumbres Observatory Global Telescope Network (16 rows)
LCOGT4 = Las Cumbres Observatory Global Telescope Network (51 rows)
LCOGT5 = Las Cumbres Observatory Global Telescope Network (24 rows)
LCOGT6 = Las Cumbres Observatory Global Telescope Network (34 rows)
LCOGT7 = Las Cumbres Observatory Global Telescope Network (8 rows)
LCOGT8 = Las Cumbres Observatory Global Telescope Network (13 rows)
LOAO = Mt. Lemmon Optical Astronomy Observatory (17 rows)
LT = Liverpool Telescope (639 rows)
MLO = Mt. Laguna Observatory (19 rows)
MO15 = Maidanak Observatory (39 rows)
RCT = Robotically Controlled Telescope (64 rows)
WC18 = Wise Observatory (330 rows)
WMO = West Mountain Observatory (81 rows)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.1 0.1nm lambda [1157.5/1746] HST COS wavelength
8- 15 F8.2 d HJD Heliocentric Julian Date; HJD-2400000
17- 21 F5.2 10-17W/m2/nm Flux [17/73] Flux in 10-15erg/cm2/s/Å
23- 26 F4.2 10-17W/m2/nm e_Flux [0.3/1.4] Uncertainty in Flux
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
De Rosa et al. Paper I. 2015ApJ...806..128D 2015ApJ...806..128D Cat. J/ApJ/806/128
Edelson et al. Paper II. 2015ApJ...806..129E 2015ApJ...806..129E cat. J/ApJ/806/129
Fausnaugh et al. Paper III. 2016ApJ...821...56F 2016ApJ...821...56F This catalog
Goad et al. Paper IV. 2016ApJ...824...11G 2016ApJ...824...11G
Pei et al. Paper V. 2017ApJ...837..131P 2017ApJ...837..131P Cat. J/ApJ/837/131
Starkey et al. Paper VI. 2017ApJ...835...65S 2017ApJ...835...65S
Mathur et al. Paper VII. 2017ApJ...846...55M 2017ApJ...846...55M
Kriss et al. Paper VIII. 2019ApJ...881..153K 2019ApJ...881..153K Cat. J/ApJ/881/153
Dehghanian et al. Paper X. 2019ApJ...877..119D 2019ApJ...877..119D
Dehghanian et al. Paper XI. 2020ApJ...898..141D 2020ApJ...898..141D
Williams et al. Paper XII. 2020ApJ...902...74W 2020ApJ...902...74W
Dehghanian et al. Paper XIII. 2021ApJ...906...14D 2021ApJ...906...14D
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Jul-2016