The Lick AGN Monitoring Project 2011: Fe II Reverberation from the Outer Broad-Line Region
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...
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| creator | 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 Jong-Hak Woo Assef, Roberto J Hyun-Jin Bae Buehler, Tabitha S Bradley Cenko 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 |
| description | 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 (t_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. (2004), we find t_cen(Fe II)/t_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. |
| doi_str_mv | 10.48550/arxiv.1304.4643 |
| format | Article |
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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 (t_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. (2004), we find t_cen(Fe II)/t_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.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1304.4643</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Active galactic nuclei ; Continuum radiation ; Decomposition ; Emission spectra ; Galaxies ; Lag time ; Light curve ; Photoionization ; Physics - Cosmology and Nongalactic Astrophysics ; Seyfert galaxies</subject><ispartof>arXiv.org, 2013-04</ispartof><rights>2013. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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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 (t_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. (2004), we find t_cen(Fe II)/t_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.</description><subject>Active galactic nuclei</subject><subject>Continuum radiation</subject><subject>Decomposition</subject><subject>Emission spectra</subject><subject>Galaxies</subject><subject>Lag time</subject><subject>Light curve</subject><subject>Photoionization</subject><subject>Physics - Cosmology and Nongalactic Astrophysics</subject><subject>Seyfert galaxies</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotjz1PwzAYhC0kJKrSnQlZYk7xtx22UtFSKVCEMrFEafK6ONC4OEkF_x6XMt3y3OkehK4omQojJbktw7c7TCknYiqU4GdoxDiniRGMXaBJ1zWEEKY0k5KP0Fv-Djhz1QeeLZ_xk29d74Nrt_gl-AaqHjNC6R1eAF6t8CscIGwglL3zLbbB73Af6-uhh4Dvgy_rJHMtRG4bgUt0bsvPDib_OUb54iGfPybZermaz7KklNQkutaiVpIpsBWVlppKEWoZCAVGELLhKdNcEZlSq4Wpa2sry3WdplJHEgwfo-vT7J93sQ9uV4af4uhfHP0jcHMC9sF_DdD1ReOH0MZLBSOGGR53Df8FQxFaoQ</recordid><startdate>20130416</startdate><enddate>20130416</enddate><creator>Barth, Aaron J</creator><creator>Pancoast, Anna</creator><creator>Bennert, Vardha N</creator><creator>Brewer, Brendon J</creator><creator>Canalizo, Gabriela</creator><creator>Filippenko, Alexei V</creator><creator>Gates, Elinor L</creator><creator>Greene, Jenny E</creator><creator>Li, Weidong</creator><creator>Malkan, Matthew A</creator><creator>Sand, David J</creator><creator>Stern, Daniel</creator><creator>Treu, Tommaso</creator><creator>Jong-Hak Woo</creator><creator>Assef, Roberto J</creator><creator>Hyun-Jin Bae</creator><creator>Buehler, Tabitha</creator><creator>S Bradley Cenko</creator><creator>Clubb, Kelsey I</creator><creator>Cooper, Michael C</creator><creator>Diamond-Stanic, Aleksandar M</creator><creator>Hoenig, Sebastian F</creator><creator>Joner, Michael D</creator><creator>Laney, C David</creator><creator>Lazarova, Mariana S</creator><creator>Nierenberg, A M</creator><creator>Silverman, Jeffrey M</creator><creator>Tollerud, Erik J</creator><creator>Walsh, Jonelle L</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20130416</creationdate><title>The Lick AGN Monitoring Project 2011: Fe II Reverberation from the Outer Broad-Line Region</title><author>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 ; Jong-Hak Woo ; Assef, Roberto J ; Hyun-Jin Bae ; Buehler, Tabitha ; S Bradley Cenko ; 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</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a518-7d74d6526efc15f18c601f2e46e8400b3927360591f748ddffcf37d9957c60e83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Active galactic nuclei</topic><topic>Continuum radiation</topic><topic>Decomposition</topic><topic>Emission spectra</topic><topic>Galaxies</topic><topic>Lag time</topic><topic>Light curve</topic><topic>Photoionization</topic><topic>Physics - 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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 (t_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. (2004), we find t_cen(Fe II)/t_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.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1304.4643</doi><oa>free_for_read</oa></addata></record> |
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| source | Freely Accessible Journals; arXiv.org |
| subjects | Active galactic nuclei Continuum radiation Decomposition Emission spectra Galaxies Lag time Light curve Photoionization Physics - Cosmology and Nongalactic Astrophysics Seyfert galaxies |
| title | The Lick AGN Monitoring Project 2011: Fe II Reverberation from the Outer Broad-Line Region |
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