J/ApJ/702/1353 Hβ and V-band light curves of NGC 4051 (Denney+, 2009)
A revised broad-line region radius and black hole mass for the narrow-line
Seyfert 1 NGC 4051.
Denney K.D., Watson L.C., Peterson B.M., Pogge R.W., Atlee D.W.,
Bentz M.C., Bird J.C., Brokofsky D.J., Comins M.L., Dietrich M.,
Doroshenko V.T., Eastman J.D., Efimov YU.S., Gaskell C.M., Hedrick C.H.,
Klimanov S.A., Klimek E.S., Kruse A.K., Lamb J.B., Leighly K., Minezaki T.,
Nazarov S.V., Petersen E.A., Peterson P., Poindexter S., Schlesinger Y.,
Sakata K.J., Sergeev S.G., Tobin J.J., Unterborn C., Vestergaard M.,
Watkins A.E., Yoshii Y.
<Astrophys. J., 702, 1353-1366 (2009)>
=2009ApJ...702.1353D 2009ApJ...702.1353D
ADC_Keywords: Galaxies, Seyfert ; Photometry, narrow-band
Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert
Abstract:
We present the first results from a high sampling rate, multimonth
reverberation mapping campaign undertaken primarily at MDM Observatory
with supporting observations from telescopes around the world. The
primary goal of this campaign was to obtain either new or improved
Hβ reverberation lag measurements for several relatively low
luminosity active galactic nuclei (AGNs). We feature results for NGC
4051 here because, until now, this object has been a significant
outlier from AGN scaling relationships, e.g., it was previously a
∼2-3σ outlier on the relationship between the broad-line region
(BLR) radius and the optical continuum luminosity - the RBLR-L
relationship. Our new measurements of the lag time between variations
in the continuum and Hβ emission line made from spectroscopic
monitoring of NGC 4051 lead to a measured BLR radius of
RBLR=1.87+0.54-0.50 light days and black hole mass of
MBH=(1.73+0.55-0.52)x106M☉. We also present a
preliminary look at velocity-resolved Hβ light curves and time
delay measurements, although we are unable to reconstruct an
unambiguous velocity-resolved reverberation signal.
Description:
Spectra of the nuclear region of NGC 4051 were obtained from both the
1.3m telescope at MDM Observatory and the 2.6m Shajn telescope of the
Crimean Astrophysical Observatory (CrAO). The MDM observations
utilized the Boller and Chivens CCD spectrograph, where 86
observations were taken over the course of 89 nights between JD2454184
and JD2454269, targeting the Hβ4861 and [OIII]4959,5007
emission-line region of the optical spectrum. We acquired 22 CrAO
spectra over 34 nights between JD2454266 and JD2454300 with the
Nasmith spectrograph and SPEC-10 1340x100 pixel CCD.
In addition to spectral observations, we obtained supplemental V-band
photometry from the 2.0m Multicolor Active Galactic NUclei Monitoring
(MAGNUM) telescope at the Haleakala Observatories in Hawaii
(photometric fluxes measured from 23 observations between JD2454182
and JD2454311 within an aperture of 8.3"), the 70cm telescope of the
CrAO (76 CrAO photometric observations were collected between
J245D4180 and JD2454299), and the 0.4m telescope of the University of
Nebraska (28 nights between JD2454195 and JD2454290).
Objects:
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RA (2000) DE Designation(s)
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12 03 09.7 +44 31 53 NGC 4051 = 2MASX J12030968+4431525
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 235 V-band, continuum, and Hβ fluxes for NGC 4051
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d JD Julian Date
12- 15 F4.2 10-17W/m2/nm F5100 Monocromatic flux at 5100 Angstroms (1)
17- 20 F4.2 10-17W/m2/nm e_F5100 Uncertainty in F5100
22- 25 F4.2 10-16W/m2 Hbeta ? Integrated Hβ flux in units of
10-13erg/s/cm2
27- 30 F4.2 10-16W/m2 e_Hbeta ? Uncertainty in Hbeta
32- 37 A6 --- ObsCode Observatory code (2)
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Note (1): In units of 10-15 erg/s/cm2/Angstroms. This column contains
the average continuum flux density measured at rest-frame ∼5100Å
from spectroscopic observations as well as the V-band flux from
photometric observations. Spectroscopic and photometric fluxes were
intercalibrated and merged to create a single continuum light curve
(see Section 2.3).
Note (2): Observatory code as follows:
CrAO = 2.6-meter Shajn telescope of the Crimean Astrophysical Observatory.
UNebr. = 0.4-m telescope of the University of Nebraska.
MAGNUM = 2.0-m Multicolor Active Galactic NUclei Monitoring telescope.
MDM = 1.3-meter telescope at MDM Observatory.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Oct-2011