Browsing by Subject "correlation"
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Item Letter to Adkins from H.B. Stenzel on 1927-03-22(1927-03-22) Stenzel, Henryk B.Item Letter to C.G. Lalicker from H.B. Stenzel on 1939-01-25(1939-01-25) Stenzel, H.B.Item Letter to C.L. Baker from H.B. Stenzel on 1930-12-02(1930-12-02) Stenzel, Henryk B.Item Letter to C.Wythe Cooke from H.B. Stenzel on 1940-05-31(1940-05-31) Stenzel, Henryk B.Item Letter to G. Bevelander from H.B. Stenzel on 1967-03-02(1967-03-02) Stenzel, Henryk B.Item Letter to George D. Louderbrook from H.B. Stenzel on 1947-03-17(1947-03-17) Stenzel, H.B.Item Letter to Gilberto Botero from H.B. Stenzel on 1942-03-09(1942-03-09) Stenzel, Henryk B.Item Letter to H.B. Stenzel from Gilberto Botero on 1942-03-04(1942-03-04) Botero, GilbertoItem Letter to H.B. Stenzel from Morton B. Stephenson on 1949-02-19(1949-02-19) Stephenson, Morton B.Item Letter to H.B. Stenzel from Robert O. Vernon on 1950-01-09(1950-01-09) Vernon, Robert O.Item Letter to H.B. Stenzel from S.M. Herrick on 1969-08-28(1969-08-28) Herrick, S.M.Item Letter to H.B. Stenzel from W.Armstrong Price on 1944-02-09(1944-02-09) Price, W.ArmstrongItem Letter to Henryk B. Stenzel from F.Stearns MacNeil on 1963-07-10(1963-07-10) MacNeil, F.StearnsItem Letter to J.P.D. Hull from James A. Waters on 1944-03-04(1944-03-04) Waters, James A.Item Letter to M.L. Thompson from H.B. Stenzel on 1945-11-10(1945-11-10) Stenzel, Henryk B.Item Letter to Minoru Tamura from H.B. Stenzel on 1968-05-02(1968-05-02) Stenzel, Henryk B.Item Letter to Paul Bartsch from H.B. Stenzel on 1942-11-14(1942-11-14) Stenzel, Henryk B.Item Letter to Richard A. Page from H.B. Stenzel on 1960-06-20(1960-06-20) Stenzel, H.B.Item Letter to William A. Berggren from H.B. Stenzel on 1967-05-09(1967-05-09) Stenzel, Henryk B.Item The Lick AGN Monitoring Project 2011: Fe II Reverberation From The Outer Broad-Line Region(2013-06) Barth, Aaron J.; Pancoast, Anna; Bennert, Vardha N.; Brewer, Brendon J.; Canalizo, Gabriela; Filippenko, Alexei V.; Gates, Elinor L.; Greene, Jenny E.; Li, Weidong; Malkan, Matthew A.; Sand, David J.; Stern, Daniel; Treu, Tommaso; Woo, Jong-Hak; Assef, Roberto J.; Bae, Hyun-Jin; Buehler, Tabitha; Cenko, S. Bradley; Clubb, Kelsey I.; Cooper, Michael C.; Diamond-Stanic, Aleksandar M.; Hoenig, Sebastian F.; Joner, Michael D.; Laney, C. David; Lazarova, Mariana S.; Nierenberg, A. M.; Silverman, Jeffrey M.; Tollerud, Erik J.; Walsh, Jonelle L.; Silverman, Jeffrey M.; Walsh, Jonelle L.The prominent broad Fe II emission blends in the spectra of active galactic nuclei have been shown to vary in response to continuum variations, but past attempts to measure the reverberation lag time of the optical Fe II lines have met with only limited success. Here we report the detection of Fe II reverberation in two Seyfert 1 galaxies, NGC 4593 and Mrk 1511, based on data from a program carried out at Lick Observatory in Spring 2011. Light curves for emission lines including H beta and Fe II were measured by applying a fitting routine to decompose the spectra into several continuum and emission-line components, and we use cross-correlation techniques to determine the reverberation lags of the emission lines relative to V-band light curves. In both cases, the measured lag (tau(cen)) of Fe II is longer than that of H beta, although the inferred lags are somewhat sensitive to the choice of Fe II template used in the fit. For spectral decompositions done using the Fe II template of Veron-Cetty et al., we find tau(cen)(Fe II)/tau(cen)(H beta) = 1.9 +/- 0.6 in NGC 4593 and 1.5 +/- 0.3 in Mrk 1511. The detection of highly correlated variations between Fe II and continuum emission demonstrates that the Fe II emission in these galaxies originates in photoionized gas, located predominantly in the outer portion of the broad-line region.