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

G. De Rosa, B.M. Peterson, J. Ely, G.A. Kriss, D.M. Crenshaw, K. Horne, K.T. Korista, H. Netzer, R.W. Pogge, P. Arévalo, A.J. Barth, M.C. Bentz, W.N. Brandt, A.A. Breeveld, B.J. Brewer, E. Dalla Bontá, Adriana De Lorenzo-Caceres Rodriguez, K.D. Denney, M. Dietrich, R. Edelson & 30 others P.A. Evans, M.M. Fausnaugh, N. Gehrels, J.M. Gelbord, M.R. Goad, C.J. Grier, D. Grupe, P.B. Hall, J. Kaastra, B.C. Kelly, J.A. Kennea, C.S. Kochanek, P. Lira, S. Mathur, I.M. McHardy, J.A. Nousek, A. Pancoast, I. Papadakis, L. Pei, J.S. Schimoia, M. Siegel, D. Starkey, T. Treu, P. Uttley, S. Vaughan, M. Vestergaard, C. Villforth, H. Yan, S. Young, Y. Zu

Research output: Contribution to journalArticle

55 Citations (Scopus)
51 Downloads (Pure)

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 $\lambda 1640$ lagging behind the continuum by ~2.5 days and Lyα $\lambda 1215$, C iv $\lambda 1550$, and Si iv $\lambda 1400$ 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.
Original languageEnglish
JournalAstrophysical Journal
Volume806
Issue number1
DOIs
Publication statusPublished - Jun 2015

Fingerprint

reverberation
Hubble Space Telescope
spectrographs
telescopes
galaxies
continuums
time lag
project
wings
cross correlation
line of sight
light curve
engines
engine
experiment

Cite this

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. / Rosa, G. De; 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.

In: Astrophysical Journal, Vol. 806, No. 1, 06.2015.

Research output: Contribution to journalArticle

Rosa, GD, Peterson, BM, Ely, J, Kriss, GA, Crenshaw, DM, Horne, K, Korista, KT, Netzer, H, Pogge, RW, Arévalo, P, Barth, AJ, Bentz, MC, Brandt, WN, Breeveld, AA, Brewer, BJ, Dalla Bontá, E, De Lorenzo-Caceres Rodriguez, A, Denney, KD, Dietrich, M, Edelson, R, Evans, PA, Fausnaugh, MM, Gehrels, N, Gelbord, JM, Goad, MR, Grier, CJ, Grupe, D, Hall, PB, Kaastra, J, Kelly, BC, Kennea, JA, Kochanek, CS, Lira, P, Mathur, S, McHardy, IM, Nousek, JA, Pancoast, A, Papadakis, I, Pei, L, Schimoia, JS, 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
Rosa, G. De ; 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. / 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. In: Astrophysical Journal. 2015 ; Vol. 806, No. 1.
@article{d2353f72977f4d16bd8e3296a7c94791,
title = "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",
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 $\lambda 1640$ lagging behind the continuum by ~2.5 days and Lyα $\lambda 1215$, C iv $\lambda 1550$, and Si iv $\lambda 1400$ 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.",
author = "Rosa, {G. De} and B.M. Peterson and J. Ely and G.A. Kriss and D.M. Crenshaw and K. Horne and K.T. Korista and H. Netzer and R.W. Pogge and P. Ar{\'e}valo and A.J. Barth and M.C. Bentz and W.N. Brandt and A.A. Breeveld and B.J. Brewer and {Dalla Bont{\'a}}, E. and {De Lorenzo-Caceres Rodriguez}, Adriana and K.D. Denney and M. Dietrich and R. Edelson and P.A. Evans and M.M. Fausnaugh and N. Gehrels and J.M. Gelbord and M.R. Goad and C.J. Grier and D. Grupe and P.B. Hall and J. Kaastra and B.C. Kelly and J.A. Kennea and C.S. Kochanek and P. Lira and S. Mathur and I.M. McHardy and J.A. Nousek and A. Pancoast and I. Papadakis and L. Pei and J.S. Schimoia and M. Siegel and D. Starkey and T. Treu and P. Uttley and S. Vaughan and M. Vestergaard and C. Villforth and H. Yan and S. Young and Y. Zu",
note = "Date of Acceptance: 24/04/2015",
year = "2015",
month = "6",
doi = "10.1088/0004-637X/806/1/128",
language = "English",
volume = "806",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "1",

}

TY - JOUR

T1 - 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

AU - Rosa, G. De

AU - Peterson, B.M.

AU - Ely, J.

AU - Kriss, G.A.

AU - Crenshaw, D.M.

AU - Horne, K.

AU - Korista, K.T.

AU - Netzer, H.

AU - Pogge, R.W.

AU - Arévalo, P.

AU - Barth, A.J.

AU - Bentz, M.C.

AU - Brandt, W.N.

AU - Breeveld, A.A.

AU - Brewer, B.J.

AU - Dalla Bontá, E.

AU - De Lorenzo-Caceres Rodriguez, Adriana

AU - Denney, K.D.

AU - Dietrich, M.

AU - Edelson, R.

AU - Evans, P.A.

AU - Fausnaugh, M.M.

AU - Gehrels, N.

AU - Gelbord, J.M.

AU - Goad, M.R.

AU - Grier, C.J.

AU - Grupe, D.

AU - Hall, P.B.

AU - Kaastra, J.

AU - Kelly, B.C.

AU - Kennea, J.A.

AU - Kochanek, C.S.

AU - Lira, P.

AU - Mathur, S.

AU - McHardy, I.M.

AU - Nousek, J.A.

AU - Pancoast, A.

AU - Papadakis, I.

AU - Pei, L.

AU - Schimoia, J.S.

AU - Siegel, M.

AU - Starkey, D.

AU - Treu, T.

AU - Uttley, P.

AU - Vaughan, S.

AU - Vestergaard, M.

AU - Villforth, C.

AU - Yan, H.

AU - Young, S.

AU - Zu, Y.

N1 - Date of Acceptance: 24/04/2015

PY - 2015/6

Y1 - 2015/6

N2 - 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 $\lambda 1640$ lagging behind the continuum by ~2.5 days and Lyα $\lambda 1215$, C iv $\lambda 1550$, and Si iv $\lambda 1400$ 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.

AB - 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 $\lambda 1640$ lagging behind the continuum by ~2.5 days and Lyα $\lambda 1215$, C iv $\lambda 1550$, and Si iv $\lambda 1400$ 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.

UR - http://dx.doi.org/10.1088/0004-637X/806/1/128

U2 - 10.1088/0004-637X/806/1/128

DO - 10.1088/0004-637X/806/1/128

M3 - Article

VL - 806

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -