2016ApJ...821...56F

Query : 2016ApJ...821...56F

2016ApJ...821...56F - Astrophys. J., 821, 56-56 (2016/April-2)

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. and YOUNG S.

Abstract (from CDS):

We present ground-based optical photometric monitoring data for NGC 5548, 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 1158 Å to the z band (∼9160 Å). 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 He ii λ1640 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∝λ^{4/3}. 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=0.1L_{Edd}). 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.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: active - galaxies: individual: NGC 5548 - galaxies: nuclei - galaxies: Seyfert

VizieR on-line data: <Available at CDS (J/ApJ/821/56): table3.dat table4.dat>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 2617 Sy2 08 35 38.7981089496 -04 05 17.901104280   13.6   12.63 13.2 ~ 226 0
2 MCG-06-30-015 Sy1 13 35 53.7691256160 -34 17 44.160716796   13.89 13.61 8.9   ~ 1559 0
3 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2895 0
4 NGC 6814 Sy1 19 42 40.5862186152 -10 19 25.108718844   15.33 14.21 11.7 11.3 ~ 866 0
5 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2253 3

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