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Title: Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line Analysis for NGC 5548

Here, we present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part of a larger multiwavelength reverberation mapping campaign. The campaign spanned 6 months and achieved an almost daily cadence with observations from five ground-based telescopes. The Hβ and He II λ4686 broad emission-line light curves lag that of the 5100 Å optical continuum by $${4.17}_{-0.36}^{+0.36}\,\mathrm{days}$$ and $${0.79}_{-0.34}^{+0.35}\,\mathrm{days}$$, respectively. The Hβ lag relative to the 1158 Å ultraviolet continuum light curve measured by the Hubble Space Telescope is ~50% longer than that measured against the optical continuum, and the lag difference is consistent with the observed lag between the optical and ultraviolet continua. This suggests that the characteristic radius of the broad-line region is ~50% larger than the value inferred from optical data alone. We also measured velocity-resolved emission-line lags for Hβ and found a complex velocity-lag structure with shorter lags in the line wings, indicative of a broad-line region dominated by Keplerian motion. The responses of both the Hβ and He ii emission lines to the driving continuum changed significantly halfway through the campaign, a phenomenon also observed for C iv, Lyα, He II(+O III]), and Si Iv(+O Iv]) during the same monitoring period. Finally, given the optical luminosity of NGC 5548 during our campaign, the measured Hβ lag is a factor of five shorter than the expected value implied by the R BLR–L AGN relation based on the past behavior of NGC 5548.
Authors:
 [1] ;  [2] ; ORCiD logo [3] ;  [4] ; ORCiD logo [5] ;  [6] ;  [7] ; ORCiD logo [8] ; ORCiD logo [7] ;  [9] ;  [10] ; ORCiD logo [7] ; ORCiD logo [11] ;  [12] ;  [13] ;  [14] ; ORCiD logo [13] ;  [15] ; ORCiD logo [16] ; ORCiD logo [17] more »;  [13] ;  [18] ; ORCiD logo [19] ;  [13] ;  [20] ; ORCiD logo [2] ;  [21] ;  [22] ; ORCiD logo [2] ;  [14] ; ORCiD logo [13] ; ORCiD logo [23] ;  [24] ;  [25] ; ORCiD logo [13] ;  [26] ; ORCiD logo [27] ;  [28] ; ORCiD logo [23] ;  [29] ; ORCiD logo [30] ; ORCiD logo [31] ;  [7] ;  [32] ; ORCiD logo [24] ; ORCiD logo [33] ;  [2] ; ORCiD logo [20] ;  [5] ;  [13] ; ORCiD logo [28] ; ORCiD logo [34] ;  [14] ;  [35] ;  [2] ;  [22] ;  [12] ;  [14] ;  [5] ; ORCiD logo [36] ; ORCiD logo [2] ; ORCiD logo [14] ;  [2] ;  [37] ;  [21] ; ORCiD logo [38] ; ORCiD logo [39] ; ORCiD logo [13] ;  [2] ;  [40] ;  [41] ;  [2] ; ORCiD logo [15] ; ORCiD logo [2] ;  [42] ; ORCiD logo [43] ;  [39] ; ORCiD logo [28] ; ORCiD logo [2] ;  [13] ; ORCiD logo [44] ; ORCiD logo [2] ;  [5] ; ORCiD logo [45] ;  [5] ;  [46] ;  [47] ;  [48] ; ORCiD logo [49] ; ORCiD logo [50] ; ORCiD logo [51] ;  [52] ; ORCiD logo [5] ;  [53] ;  [54] ;  [55] ;  [56] ; ORCiD logo [6] ;  [8] ; ORCiD logo [57] ;  [58] ;  [59] ;  [60] ;  [61] ; ORCiD logo [62] ;  [63] ;  [64] ;  [65] ;  [5] ;  [53] ;  [48] ; ORCiD logo [66] ;  [67] ;  [5] ;  [68] ;  [69] ;  [70] ; ORCiD logo [71] ;  [72] ;  [72] ;  [57] ;  [72] ;  [58] ;  [73] ;  [48] ; ORCiD logo [7] ;  [74] ;  [75] ;  [48] ;  [47] ; ORCiD logo [76] ;  [5] ;  [71] ;  [47] ;  [77] ;  [5] ; ORCiD logo [78] ;  [79] ; ORCiD logo [78] ; ORCiD logo [5] ;  [78] ;  [47] ;  [80] ;  [29] ; ORCiD logo [67] ;  [53] ;  [72] ;  [5] ;  [5] ;  [81] ; ORCiD logo [82] ;  [83] ;  [66] ;  [20] ;  [55] ;  [84] « less
  1. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Astronomy
  2. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy
  3. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  4. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; The Ohio State Univ., Columbus, OH (United States). Center for Cosmology and AstroParticle Physics; Space Telescope Science Inst., Baltimore, MD (United States)
  5. Georgia State Univ., Atlanta, GA (United States). Dept. of Physics and Astronomy
  6. Space Telescope Science Inst., Baltimore, MD (United States)
  7. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; The Ohio State Univ., Columbus, OH (United States). Center for Cosmology and AstroParticle Physics
  8. Univ. of Leicester (United Kingdom). Dept. of Physics and Astronomy
  9. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics
  10. Space Telescope Science Inst., Baltimore, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
  11. California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States). Dept. of Physics
  12. Univ. of Wyoming, Laramie, WY (United States). Dept. of Physics and Astronomy
  13. Univ. of California, Berkeley, CA (United States). Dept. of Astronomy
  14. Univ. degli Studi di Padova (Italy). Dipartimento di Fisica e Astronomia; Istituto Nazionale di Astrofisica (INAF), Padova (Italy). Osservatorio Astronomico di Padova
  15. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences
  16. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; Pennsylvania State Univ., University Park, PA (United States). Eberly College of Science, Dept of Astronomy and Astrophysics; Pennsylvania State Univ., University Park, PA (United States). Inst. for Gravitation and the Cosmos
  17. Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Centre; Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
  18. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astrophysics
  19. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; Pennsylvania State Univ., University Park, PA (United States). Eberly College of Science, Dept of Astronomy and Astrophysics; Pennsylvania State Univ., University Park, PA (United States). Center for Exoplanets and Habitable Worlds
  20. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
  21. Univ. of California, Riverside, CA (United States). Dept. of Astronomy
  22. Univ. of Colorado, Boulder, CO (United States). Dept. of Astrophysical and Planetary Sciences
  23. he Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; The Ohio State Univ., Columbus, OH (United States). Center for Cosmology and AstroParticle Physics
  24. Univ. of California, Santa Cruz, CA (United States). Dept. of Astronomy and Astrophysics
  25. Pennsylvania State Univ., University Park, PA (United States). Eberly College of Science, Dept of Astronomy and Astrophysics; Pennsylvania State Univ., University Park, PA (United States). Inst. for Gravitation and the Cosmos; Georgia Inst. of Technology, Atlanta, GA (United States). Center for Relativistic Astrophysics; Univ. of Washington, Seattle, WA (United States). Dept. of Astronomy
  26. Lick Observatory, Mt. Hamilton, CA (United States)
  27. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
  28. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  29. Univ. of Copenhagen (Denmark). The Niels Bohr Inst., Dark Cosmology Centre
  30. Univ. of California, Santa Cruz, CA (United States). Santa Cruz Inst. for Particle Physics and Dept. of Physics
  31. Stanford Univ., CA (United States). Dept. of Physics; Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  32. Univ. of Melbourne (Australia). School of Physics
  33. Columbia Univ., New York, NY (United States). Dept. of Astronomy
  34. Univ. of California, Santa Cruz, CA (United States). Dept. of Astronomy and Astrophysics; Max Planck Inst. for Astronomie, Heidelberg (Germany)
  35. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; United States Naval Academy, Annapolis, MD (United States). Dept. of Physics
  36. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  37. Pennsylvania State Univ., University Park, PA (United States). Eberly College of Science, Dept of Astronomy and Astrophysics; Pennsylvania State Univ., University Park, PA (United States). Inst. for Gravitation and the Cosmos; Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Astronomy
  38. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; Univ. Federal do Rio do Sul, Porto Alegre (Brazil). Inst. de Fisica
  39. Carnegie Observatories, Pasadena, CA (United States)
  40. Univ. degli Studi di Padova (Italy). Dipartimento di Fisica e Astronomia
  41. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy
  42. Millennium Inst. of Astrophysics, Santiago (Chile); Pontifical Catholic Univ. of Chile, Santiago (Chile)
  43. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy; Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
  44. Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
  45. Univ. de Valparaiso (Chile). Inst. de Fisica y Astronomia
  46. The Ohio State Univ., Columbus, OH (United States). Dept of Astronomy; Osservatorio Astrofisico di Arcetri, Firenze (Italy)
  47. Crimean Astrophysical Observatory, Crimea (Russia)
  48. Southwestern Univ., Georgetown, TX (United States). Fountainwood Observatory, Dept. of Physics
  49. Pennsylvania State Univ., University Park, PA (United States). Eberly College of Science, Dept of Astronomy and Astrophysics; Pennsylvania State Univ., University Park, PA (United States). Inst. for Gravitation and the Cosmos; Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics
  50. Univ. College London (UCL), Surrey (United Kingdom). Mullard Space Science Lab. (MSSL)
  51. Wayne State Univ., Detroit, MI (United States). Dept. of Physics and Astronomy
  52. Western Kentucky Univ., Bowling Green, KY (United States)
  53. Univ. of St. Andrews, Scotland (United Kingdom). School of Physics and Astronomy
  54. Ohio Univ., Athens, OH (United States). Dept. of Physics and Astronomy; Worcester State Univ., MA (United States)
  55. Univ. of Maryland, College Park, MD (United States). Dept. of Astronomy
  56. Pulkovo Observatory, St. Petersburg (Russia)
  57. Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics and Astronomy
  58. San Diego State Univ., CA (United States). Dept. of Astronomy
  59. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Astrophysics Science Division
  60. Inst. de Astrofisica de Canarias, Tenerife (Spain); Univ. of La Laguna, Tenerife (Spain). Dept. de Astrofisica; Gran Telescopio Canarias (GRANTECAN), Tenerife (Spain)
  61. Spectral Sciences Inc., Burlington, MA (United States); Eureka Scientific Inc., Oakland, CA (United States)
  62. Morehead State Univ., KY (United States). Space Science Center
  63. The Ohio State Univ., Columbus, OH (United States). Dept. of Astronomy
  64. York Univ., Toronto, ON (Canada). Dept. of Physics and Astronomy
  65. Western Kentucky Univ., Bowling Green, KY (United States). Dept. of Physics and Astronomy
  66. Seoul National Univ. (Korea, Republic of). Dept. of Physics & Astronomy
  67. Brigham Young Univ., Provo, UT (United States). Dept. of Physics and Astronomy
  68. SRON Netherlands Inst. for Space Research, Utrecht (Netherlands); Univ. of Utrecht (Netherlands). Dept. of Physics and Astronomy; Leiden Univ. (Netherlands). Leiden Observatory
  69. Tel Aviv Univ. (Israel). School of Physics and Astronomy; Technion-Israel Inst. of Tech., Haifa (Israel). Dept. of Physics
  70. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
  71. Pennsylvania State Univ., University Park, PA (United States). Eberly College of Science, Dept of Astronomy and Astrophysics
  72. Korea Astronomy and Space Science Inst. (Korea)
  73. Univ. de Chile, Santiago (Chile). Dept. de Astronomia
  74. Univ. of Southampton (United Kingdom)
  75. Univ. dell' Insubria, Como (Italy). Dept. of Applied Science and Technology (DISAT)
  76. Tel Aviv Univ. (Israel). School of Physics and Astronomy
  77. Univ. of Crete (Greece). Inst. of Theoretical and Computational Physics, Dept. of Physics; Inst. of Electronic Structure and Laser (IESL), Crete (Greece). Foundation for Research and Technology (FORTH)
  78. Max Planck Inst. for Astronomie, Heidelberg (Germany)
  79. Technion-Israel Inst. of Tech., Haifa (Israel). Dept. of Physics; Univ. of Haifa (Israel). Dept. of Physics
  80. Las Cumbres Observatory Global Telescope Network, Goleta, CA (United States)
  81. Univ. of Amsterdam (Netherlands). Anton Pannekoek Astronomical Inst.
  82. Univ. of Bath (United Kingdom)
  83. Technion-Israel Inst. of Tech., Haifa (Israel). Dept. of Physics
  84. The Ohio State Univ., Columbus, OH (United States). Center for Cosmology and AstroParticle Physics; Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
Publication Date:
Grant/Contract Number:
AC02-76SF00515; FG02-97ER25308; NAS5-26555; AST-1412693; AST-1008882; AST-1253702; AST-1211916; AST-1515876; AST-1312296; AST-1302093; ST/M001296/1; AST-0618209; DFF 4002-00275
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 837; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA); UK Science and Technology Facilities Council; National Research Foundation of Korea (NRFK); Netherlands Organization for Scientific Research (NWO)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1352630