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J/ApJ/837/131 Space telescope RM project. V. NGC5548 sp. monitoring (Pei+, 2017)

Space Telescope and optical reverberation mapping project. V. Optical spectroscopic campaign and emission-line analysis for NGC 5548. Pei L., Fausnaugh M.M., Barth A.J., Peterson B.M., Bentz M.C., De Rosa G., Denney K.D., Goad M.R., Kochanek C.S., Korista K.T., Kriss G.A., Pogge R.W., Bennert V.N., Brotherton M., Clubb K.I., Dalla Bonta E., Filippenko A.V., Greene J.E., Grier C.J., Vestergaard M., Zheng W., Adams S.M., Beatty T.G., Bigley A., Brown J.E., Brown J.S., Canalizo G., Comerford J.M., Coker C.T., Corsini E.M., Croft S., Croxall K.V., Deason A.J., Eracleous M., Fox O.D., Gates E.L., Henderson C.B., Holmbeck E., Holoien T.W.-S., Jensen J.J., Johnson C.A., Kelly P.L., Kim S., King A., Lau M.W., Li M., Lochhaas C., Ma Z., Manne-Nicholas E.R., Mauerhan J.C., Malkan M.A., McGurk R., Morelli L., Mosquera A., Mudd D., Sanchez F.M., Nguyen M.L., Ochner P., Ou-Yang B., Pancoast A., Penny M.T., Pizzella A., Poleski R., Runnoe J., Scott B., Schimoia J.S., Shappee B.J., Shivvers I., Simonian G.V., Siviero A., Somers G., Stevens D.J., Strauss M.A., Tayar J., Tejos N., Treu T., Van Saders J., Vican L., Villanueva S., Yuk H., Zakamska N.L., Zhu W., Anderson M.D., Arevalo P., Bazhaw C., Bisogni S., Borman G.A., Bottorff M.C., Brandt W.N., Breeveld A.A., Cackett E.M., Carini M.T., Crenshaw D.M., De Lorenzo-caceres A., Dietrich M., Edelson R., Efimova N.V., Ely J., Evans P.A., Ferland G.J., Flatland K., Gehrels N., Geier S., Gelbord J.M., Grupe D., Gupta A., Hall P.B., Hicks S., Horenstein D., Horne K., Hutchison T., Im M., Joner M.D., Jones J., Kaastra J., Kaspi S., Kelly B.C., Kennea J.A., Kim M., Kim S.C., Klimanov S.A., Lee J.C., Leonard D.C., Lira P., Macinnis F., Mathur S., Mchardy I.M., Montouri C., Musso R., Nazarov S.V., Netzer H., Norris R.P., Nousek J.A., Okhmat D.N., Papadakis I., Parks J.R., Pott J.-U., Rafter S.E., Rix H.-W., Saylor D.A., Schnulle K., Sergeev S.G., Siegel M., Skielboe A., Spencer M., Starkey D., Sung H.-I., Teems K.G., Turner C.S., Uttley P., Villforth C., Weiss Y., Woo J.-H., Yan H., Young S., Zu Y. <Astrophys. J., 837, 131-131 (2017)> =2017ApJ...837..131P (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Spectroscopy Keywords: galaxies: active; galaxies: individual: NGC 5548; galaxies: nuclei; galaxies: Seyfert Abstract: We present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part of a larger multiwavelength reverberation mapping campaign. The campaign spanned 6 months and achieved an almost daily cadence with observations from five ground-based telescopes. The Hβ and HeIIλ4686 broad emission-line light curves lag that of the 5100Å optical continuum by 4.17-0.36+0.36days and 0.79-0.34+0.35days, respectively. The Hβ lag relative to the 1158Å ultraviolet continuum light curve measured by the Hubble Space Telescope is ∼50% longer than that measured against the optical continuum, and the lag difference is consistent with the observed lag between the optical and ultraviolet continua. This suggests that the characteristic radius of the broad-line region is ∼50% larger than the value inferred from optical data alone. We also measured velocity-resolved emission-line lags for Hβ and found a complex velocity-lag structure with shorter lags in the line wings, indicative of a broad-line region dominated by Keplerian motion. The responses of both the Hβ and He II emission lines to the driving continuum changed significantly halfway through the campaign, a phenomenon also observed for CIV, Lyα, HeII(+OIII]), and SiIV(+OIV]) during the same monitoring period. Finally, given the optical luminosity of NGC5548 during our campaign, the measured Hβ lag is a factor of five shorter than the expected value implied by the RBLR-LAGN relation based on the past behavior of NGC 5548. Description: Spectroscopic data were obtained from five telescopes: the McGraw-Hill 1.3m telescope at the MDM Observatory (4225-5775Å; median S/N=118), the Shane 3m telescope at the Lick Observatory (Kast Double Spectrograph: 3250-7920Å; median S/N=194), the 1.22m Galileo telescope at the Asiago Astrophysical Observatory (3250-7920Å; median S/N=160), the 3.5m telescope at Apache Point Observatory (APO; Dual Imaging Spectrograph: 4180-5400Å, median S/N =160), and the 2.3m telescope at the Wyoming Infrared Observatory (WIRO; 5599-4399Å; median S/N=217). The optical spectroscopic monitoring targeting NGC 5548 began on 2014 January 4 and continued through 2014 July 6 with approximately daily cadence. MDM contributed the largest number of spectra with 143 epochs. 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 table2.dat 69 217 Flux measurements for continuum and emission lines
See also: J/ApJS/115/185 : 3C 390.3 BVRI and H photometry (Dietrich+, 1998) J/ApJ/510/659 : Size and Structure of AGN in NGC 5548 (Peterson+, 1999) J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004) J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004) J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005) J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009) J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010) J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010) J/ApJ/732/121 : V-band and Hβ monitoring of Z299-15 (Barth+, 2011) J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013) J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014) J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015) J/ApJ/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015) J/ApJ/806/22 : SEAMBHs IV. Hβ time lags (Du+, 2015) J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015) J/ApJ/821/56 : Space tel. RM project. III. NGC 5548 LCs (Fausnaugh+, 2016) J/ApJ/827/118 : A new reverberation mapping campain on NGC 5548 (Lu+, 2016) J/ApJ/818/30 : Lag measurements for z<0.8 QSOs from the SDSS-RM (Shen+, 2016) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 F7.2 d HJD Heliocentric Julian Date; JD-2450000 9- 14 A6 --- Tel Telescope code (1) 16- 21 F6.3 10-15cW/m2/nm F5100 [10/13.5] Flux density at 5100Å (2) 23- 27 F5.3 10-15cW/m2/nm e_F5100 [0.03/0.1] Uncertainty in F5100 (2) 29- 35 F7.3 10-15mW/m2 FHb [661/822] Linear continuum model Hβ emission-line flux density (3) 37- 41 F5.3 10-15mW/m2 e_FHb [2/8] Uncertainty in FHb (3) 43- 49 F7.3 10-15mW/m2 FHbSD [656/803]? Spectral decomposition method Hβ emission-line flux density (3) 51- 55 F5.3 10-15mW/m2 e_FHbSD [4/8]? Uncertainty in FHbSD (3) 57- 63 F7.3 10-15mW/m2 FHeIISD [21/163]? Spectral decomposition method HeII emission-line flux density (3) 65- 69 F5.3 10-15mW/m2 e_FHeIISD [2/10]? Uncertainty in FHeIISD (3)
Note (1): Telescope code as follows: MDM = The McGraw-Hill 1.3-m telescope at the MDM Observatory. Asiago = The 1.22-m Galileo telescope at the Asiago Astrophysical Observatory. Lick = The Shane 3-m telescope at the Lick Observatory. APO = The 3.5-m telescope at Apache Point Observatory. WIRO = The 2.3-m telescope at the Wyoming Infrared Observatory. Note (2): In units of 1e-15erg/s/cm2/Angstroms. Note (3): In units of 1e-15erg/s/cm2. All emission-line fluxes include contributions from both broad- and narrow-line components
History: From electronic version of the journal References: De Rosa et al. Paper I. 2015ApJ...806..128D Cat. J/ApJ/806/128 Edelson et al. Paper II. 2015ApJ...806..129E Cat. J/ApJ/806/129 Fausnaugh et al. Paper III. 2016ApJ...821...56F Cat. J/ApJ/821/56 Goad et al. Paper IV. 2016ApJ...824...11G Pei et al. Paper V. 2017ApJ...846...55M This catalog Starkey et al. Paper VI. 2017ApJ...835...65S Mathur et al. Paper VII. 2017ApJ...846...55M
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Oct-2017
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