Space telescope and optical reverberation mapping project. I. Ultraviolet observations of the Seyfert 1 galaxy NGC 5548 with the cosmic origins spectrograph on Hubble Space Telescope
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We describe the first results from a six-month long reverberation-mapping experiment in the ultraviolet based on 171 observations of the Seyfert 1 galaxy NGC 5548 with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Significant correlated variability is found in the continuum and broad emission lines, with amplitudes ranging from ∼30% to a factor of two in the emission lines and a factor of three in the continuum. The variations of all the strong emission lines lag behind those of the continuum, with He ii λ1640 lagging behind the continuum by ∼2.5 days and Ly λ1215, C iv λ1550, and Si iv λ1400 lagging by ∼5-6 days. The relationship between the continuum and emission lines is complex. In particular, during the second half of the campaign, all emission-line lags increased by a factor of 1.3-2 and differences appear in the detailed structure of the continuum and emission-line light curves. Velocity-resolved cross-correlation analysis shows coherent structure in lag versus line of sight velocity for the emission lines; the high-velocity wings of C iv respond to continuum variations more rapidly than the line core, probably indicating higher velocity broad-line region clouds at smaller distances from the central engine. The velocity-dependent response of Lyα, however, is more complex and will require further analysis.
Rosa , G D , Peterson , B M , Ely , J , Kriss , G A , Crenshaw , D M , Horne , K , Korista , K T , Netzer , H , Pogge , R W , Arévalo , P , Barth , A J , Bentz , M C , Brandt , W N , Breeveld , A A , Brewer , B J , Dalla Bontá , E , De Lorenzo-Caceres Rodriguez , A , Denney , K D , Dietrich , M , Edelson , R , Evans , P A , Fausnaugh , M M , Gehrels , N , Gelbord , J M , Goad , M R , Grier , C J , Grupe , D , Hall , P B , Kaastra , J , Kelly , B C , Kennea , J A , Kochanek , C S , Lira , P , Mathur , S , McHardy , I M , Nousek , J A , Pancoast , A , Papadakis , I , Pei , L , Schimoia , J S , Siegel , M , Starkey , D , Treu , T , Uttley , P , Vaughan , S , Vestergaard , M , Villforth , C , Yan , H , Young , S & Zu , Y 2015 , ' Space telescope and optical reverberation mapping project. I. Ultraviolet observations of the Seyfert 1 galaxy NGC 5548 with the cosmic origins spectrograph on Hubble Space Telescope ' Astrophysical Journal , vol. 806 , no. 1 . DOI: 10.1088/0004-637X/806/1/128
© 2015. The American Astronomical Society. All rights reserved. Reproduced in accordance with the Publisher's author self-archiving policy. Originally published in The Astrophysical Journal: http://dx.doi.org/10.1088/0004-637X/806/1/128
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