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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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Date
12/06/2015
Author
De Rosa, G.
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, Adriana
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.
Funder
Science & Technology Facilities Council
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/J001651/1
ST/K001515/1
ST/M001296/1
Keywords
Galaxies: active
Galaxies: individual (NGC 5548
Galaxies: nuclei
Galaxies: Seyfert
QB Astronomy
QC Physics
NDAS
BDC
Metadata
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Abstract
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.
Citation
De Rosa , G , 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 . https://doi.org/10.1088/0004-637X/806/1/128
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/806/1/128
ISSN
0004-637X
Type
Journal article
Rights
© 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
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/7027

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