J/ApJ/806/128 Space telescope RM project. I. NGC5548 (De Rosa+, 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.
De Rosa G., Peterson B.M., Ely J., Kriss G.A., Crenshaw D.M., Horne K.,
Korista K.T., Netzer H., Pogge R.W., Arevalo P., Barth A.J., Bentz M.C.,
Brandt W.N., Breeveld A.A., Brewer B.J., Dalla Bonta E.,
De Lorenzo-Caceres 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.
<Astrophys. J., 806, 128 (2015)>
=2015ApJ...806..128D 2015ApJ...806..128D (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Spectra, ultraviolet
Keywords: galaxies: active; galaxies: individual: NGC 5548;
galaxies: nuclei; galaxies: Seyfert
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
HeIIλ1640 lagging behind the continuum by ∼2.5 days and
Lyαλ1215, CIVλ1550, and SiIVλ1400 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 CIV 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.
Description:
Observations were made in single-orbit HST COS visits approximately
daily from 2014 February 1 through July 27.
In each visit, we used the G130M and G160M gratings to observe the UV
spectrum over the range 1153-1796Å in four separate exposures.
Exposure times were selected to provide S/N≳100 when measured over
velocity bins of ∼500km/s.
Objects:
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RA (ICRS) DE Designation(s)
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14 17 59.51 +25 08 12.5 NGC 5548 = LEDA 51074
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 87 171 Continuum and emission-line light curves
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJS/216/4 : SDSS-RM project: technical overview (Shen+, 2015)
J/ApJ/805/96 : SDSS-RM project: velocity dispersions of QSOs (Shen+, 2015)
J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)
J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)
J/ApJ/753/L2 : Reverberation mapping of AGNs (Assef+, 2012)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)
J/ApJ/699/800 : Mass functions of active black holes (Vestergaard+, 2009)
J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)
J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/A+A/422/925 : Profile variability in lines of NGC 5548 (Shapovalova+ 2004)
J/ApJ/599/886 : Emission lines of radio-loud AGN (Eracleous+, 2003)
J/AJ/126/1720 : ugriz and Hα of double-peaked AGN (Strateva+, 2003)
J/A+A/320/405 : NGC 5548 continuum light curve (Sergeev+ 1997)
J/A+A/314/43 : NGC 5548 Profile variability (Kollatschny+ 1996)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD130 Heliocentric Julian Date of the G130M
observation (1)
13- 17 F5.2 10-15cW/m2/nm F1367 [21.8/64.8] G130M 1367 Angstrom flux (2)
19- 22 F4.2 10-15cW/m2/nm e_F1367 [0.5/1] Uncertainty in F1367 (3)
24- 28 F5.2 10-13mW/m2 FLya [34.3/46.9] G130M integrated Lyα
line flux (4)
30- 33 F4.2 10-13mW/m2 e_FLya [0.4/0.6] Uncertainty in FLya (3)
35- 38 F4.2 10-13mW/m2 FNV [1.1/3.5] G130M integrated NV 1240Å
line flux (4)
40- 43 F4.2 10-13mW/m2 e_FNV [0.05/0.08] Uncertainty in FNUV (3)
45- 48 F4.2 10-13mW/m2 FSiIV [3.2/6] G130M integrated SiIV 1400Å
line flux (4)
50- 53 F4.2 10-13mW/m2 e_FSiIV [0.1/0.4] Uncertainty in FSiIV (3)
55- 65 F11.6 d HJD160 Heliocentric Julian Date of the G160M
observation (1)
67- 71 F5.2 10-13mW/m2 FCIV [47.2/63] G160M integrated CIV 1549Å
line flux (4)
73- 76 F4.2 10-13mW/m2 e_FCIV [0.7/1] Uncertainty in FCIV (3)
78- 82 F5.2 10-13mW/m2 FHeII [5.4/10.7] G160M integrated HeII 1640Å
line flux (4)
84- 87 F4.2 10-13mW/m2 e_FHeII [0.2/0.5] Uncertainty in FHeII (3)
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Note (1): Midpoint of the observation (HJD-2450000).
Note (2): In units of 1e-15erg/s/cm2/Angstroms.
Note (3): Flux uncertainties include both statistical and systematic errors.
Note (4): In units of 1e-13erg/s/cm2.
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History:
From electronic version of the journal
References:
Edelson et al. Paper II. 2015ApJ...806..129E 2015ApJ...806..129E Cat. J/ApJ/806/129
Fausnaugh et al. Paper III. 2016ApJ...821...56F 2016ApJ...821...56F Cat. J/ApJ/821/56
Goad et al. Paper IV. 2016ApJ...824...11G 2016ApJ...824...11G
Pei et al. Paper V. 2017ApJ...837..131P 2017ApJ...837..131P Cat. J/ApJ/837/131
Starkey et al. Paper VI. 2017ApJ...835...65S 2017ApJ...835...65S
Mathur et al. Paper VII. 2017ApJ...846...55M 2017ApJ...846...55M
Kriss et al. Paper VIII. 2019ApJ...881..153K 2019ApJ...881..153K Cat. J/ApJ/881/153
Dehghanian et al. Paper X. 2019ApJ...877..119D 2019ApJ...877..119D
Dehghanian et al. Paper XI. 2020ApJ...898..141D 2020ApJ...898..141D
Williams et al. Paper XII. 2020ApJ...902...74W 2020ApJ...902...74W
Dehghanian et al. Paper XIII. 2021ApJ...906...14D 2021ApJ...906...14D
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Oct-2015