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

Gisella De Rosa, B. M. Peterson, J. Ely, G. A. Kriss, D. M. Crenshaw, Keith Horne, K. T. Korista, H. Netzer, R. W. Pogge, P. Arévalo, A. J. Barth, M. C. Bentz, William Nielsen Brandt, A. A. Breeveld, B. J. Brewer, E. Dalla Bontá, A. De Lorenzo-Cáceres, K. D. Denney, M. Dietrich, R. EdelsonP. 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, Jamie A. Kennea, C. S. Kochanek, P. Lira, S. Mathur, I. M. McHardy, John Andrew Nousek, A. Pancoast, I. Papadakis, L. Pei, J. S. Schimoia, Michael Hiram Siegel, D. Starkey, T. Treu, P. Uttley, S. Vaughan, M. Vestergaard, C. Villforth, H. Yan, S. Young, Y. Zu

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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 lagging behind the continuum by ∼2.5 days and Ly , C iv , and Si iv 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 Ly, however, is more complex and will require further analysis.

Original languageEnglish (US)
Article number128
JournalAstrophysical Journal
Volume806
Issue number1
DOIs
StatePublished - Jun 10 2015

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

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

De Rosa, Gisella ; Peterson, B. M. ; Ely, J. ; Kriss, G. A. ; Crenshaw, D. M. ; Horne, Keith ; Korista, K. T. ; Netzer, H. ; Pogge, R. W. ; Arévalo, P. ; Barth, A. J. ; Bentz, M. C. ; Brandt, William Nielsen ; Breeveld, A. A. ; Brewer, B. J. ; Dalla Bontá, E. ; Lorenzo-Cáceres, A. De ; 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, Jamie A. ; Kochanek, C. S. ; Lira, P. ; Mathur, S. ; McHardy, I. M. ; Nousek, John Andrew ; Pancoast, A. ; Papadakis, I. ; Pei, L. ; Schimoia, J. S. ; Siegel, Michael Hiram ; 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.
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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 lagging behind the continuum by ∼2.5 days and Ly , C iv , and Si iv 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 Ly, however, is more complex and will require further analysis.",
author = "{De Rosa}, Gisella and Peterson, {B. M.} and J. Ely and Kriss, {G. A.} and Crenshaw, {D. M.} and Keith Horne and Korista, {K. T.} and H. Netzer and Pogge, {R. W.} and P. Ar{\'e}valo and Barth, {A. J.} and Bentz, {M. C.} and Brandt, {William Nielsen} and Breeveld, {A. A.} and Brewer, {B. J.} and {Dalla Bont{\'a}}, E. and Lorenzo-C{\'a}ceres, {A. De} and Denney, {K. D.} and M. Dietrich and R. Edelson and Evans, {P. A.} and Fausnaugh, {M. M.} and N. Gehrels and Gelbord, {J. M.} and Goad, {M. R.} and Grier, {C. J.} and D. Grupe and Hall, {P. B.} and J. Kaastra and Kelly, {B. C.} and Kennea, {Jamie A.} and Kochanek, {C. S.} and P. Lira and S. Mathur and McHardy, {I. M.} and Nousek, {John Andrew} and A. Pancoast and I. Papadakis and L. Pei and Schimoia, {J. S.} and Siegel, {Michael Hiram} 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",
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month = "6",
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language = "English (US)",
volume = "806",
journal = "Astrophysical Journal",
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De Rosa, G, 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, Lorenzo-Cáceres, AD, 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, MH, 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, 128. https://doi.org/10.1088/0004-637X/806/1/128

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. / De Rosa, Gisella; Peterson, B. M.; Ely, J.; Kriss, G. A.; Crenshaw, D. M.; Horne, Keith; Korista, K. T.; Netzer, H.; Pogge, R. W.; Arévalo, P.; Barth, A. J.; Bentz, M. C.; Brandt, William Nielsen; Breeveld, A. A.; Brewer, B. J.; Dalla Bontá, E.; Lorenzo-Cáceres, A. De; 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, Jamie A.; Kochanek, C. S.; Lira, P.; Mathur, S.; McHardy, I. M.; Nousek, John Andrew; Pancoast, A.; Papadakis, I.; Pei, L.; Schimoia, J. S.; Siegel, Michael Hiram; 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, 128, 10.06.2015.

Research output: Contribution to journalArticle

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 - De Rosa, Gisella

AU - Peterson, B. M.

AU - Ely, J.

AU - Kriss, G. A.

AU - Crenshaw, D. M.

AU - Horne, Keith

AU - Korista, K. T.

AU - Netzer, H.

AU - Pogge, R. W.

AU - Arévalo, P.

AU - Barth, A. J.

AU - Bentz, M. C.

AU - Brandt, William Nielsen

AU - Breeveld, A. A.

AU - Brewer, B. J.

AU - Dalla Bontá, E.

AU - Lorenzo-Cáceres, A. De

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, Jamie A.

AU - Kochanek, C. S.

AU - Lira, P.

AU - Mathur, S.

AU - McHardy, I. M.

AU - Nousek, John Andrew

AU - Pancoast, A.

AU - Papadakis, I.

AU - Pei, L.

AU - Schimoia, J. S.

AU - Siegel, Michael Hiram

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.

PY - 2015/6/10

Y1 - 2015/6/10

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 lagging behind the continuum by ∼2.5 days and Ly , C iv , and Si iv 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 Ly, 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 lagging behind the continuum by ∼2.5 days and Ly , C iv , and Si iv 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 Ly, however, is more complex and will require further analysis.

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JO - Astrophysical Journal

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