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Space telescope and optical reverberation mapping project. III. Optical continuum emission and broadband time delays in NGC 5548

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Space telescope and optical reverberation mapping project. III. Optical continuum emission and broadband time delays in NGC 5548

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Título Space telescope and optical reverberation mapping project. III. Optical continuum emission and broadband time delays in NGC 5548
Autor Fausnaugh, Michael
Denney, Kelly D.
Barth, Aaron J.
Bentz, Misty Cherie
Bottorff, Mark
Carini, Michael
Croxall, Kevin V.
De Rosa, Gisella
Goad, Michael R.
Horne, Keith
Joner, Michael D.
Kaspi, Shai
Kim, Minsun
Klimanov, S. A.
Kochanek, C.S.
Leonard, Douglas C.
Netzer, Hagai
Peterson, Bradley M.
Schnuelle, Kirsten
Sergeev, Sergey G.
Vestergaard, Marianne
Zheng, WeiKang
Zu, Ying
Anderson, Matt
Arévalo, Patricia
Bazhaw, C.
Borman, G. A.
Boroson, Todd
Brandt, W.N.
Breeveld, Alice A.
Brewer, Brendon J.
Cackett, Edward M.
Crenshaw, Daniel Michael
Dalla Bontà, Elena
De Lorenzo-Cáceres, Adriana
Dietrich, Matthias
Edelson, Rick A.
Efimova, Natalia V.
Ely, Justin C.
Evans, Phil A.
Filippenko, Alexei V.
Flatland, Kelsi
Gehrels, Neil C.
Geier, Stephan
Gelbord, Jonathan M.
Gonzalez, Luis A.
Gorjian, Varoujan
Grier, Catherine J.
Grupe, Dirk
Hall, Patrick B.
Hicks, Shannon
Horenstein, Daniel
Hutchison, T.
Im, Myungshin
Jensen, J. J.
Jones, Jeremy Bryn
Kaastra, Jelle S.
Kelly, Brandon Charles
Kennea, Jamie A.
Kim, Sang Chul
Korista, Kirk T.
Kriss, Gerard A.
Lee, Julia C.
Lira, Paulina
MacInnis, F.
Manne-Nicholas, Emily R.
Mathur, Smita
Mchardy, Ian Michael
Montouri, C.
Musso, R.
Nazarov, S. V.
Norris, Richard P.
Nousek, John A.
Okhmat, D. N.
Pancoast, Anna
Papadakis, Iossif
Parks, J. Robert
Pei, Liuyi
Pogge, Richard William
Pott, Jörg-Uwe
Rafter, Stephen E.
Rix, H.-W.
Saylor, Dicy A.
Schimoia, Jáderson da Silva
Siegel, Michael H.
Spencer, Meghin
Starkey, Donn R.
Sung, Hyun-Il
Teems, Katherine G.
Treu, Tommaso
Turner, Clay S.
Uttley, Phil
Villforth, Carolin
Weiss, Y.
Woo, Jong-Hak
Yan, H.
Young, Stuart
Abstract 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 l1640 and l4686), 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 t μ l4 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.
Contido em The astrophysical journal. Bristol. Vol. 821, no. 1 (Apr. 2016), 56, 25 p.
Assunto Galáxia NGC 5548
Galáxias ativas
Galaxias seyfert
Nucleo galatico
[en] Galaxies: active
[en] Galaxies: individual (NGC 5548)
[en] Galaxies: nuclei
[en] Galaxies: Seyfert Supporting
[en] Material: machine-readable tables
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/148901
Arquivos Descrição Formato
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