SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. II.<i>SWIFT</i>AND<i>HST</i>REVERBERATION MAPPING OF THE ACCRETION DISK OF NGC 5548
R. EdelsonDepartment of Astronomy, University of Maryland, College Park, MD 20742-2421, USAJ. M. GelbordEureka Scientific Inc., 2452 Delmer St. Suite 100, Oakland, CA 94602, USAK. HorneSUPA Physics and Astronomy, University of St. Andrews, Fife, KY16 9SS Scotland, UKI. M. McHardyUniversity of Southampton, Highfield, Southampton, SO17 1BJ, UKB. M. PetersonCenter for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Ave, Columbus, OH 43210, USAP. ArévaloInstituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Gran Bretana N 1111, Playa Ancha, Valparaíso, ChileA. A. BreeveldMullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UKG. De RosaCenter for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Ave, Columbus, OH 43210, USAP. A. EvansUniversity of Leicester, Department of Physics and Astronomy, Leicester, LE1 7RH, UKM. R. GoadUniversity of Leicester, Department of Physics and Astronomy, Leicester, LE1 7RH, UKG. A. KrissDepartment of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USAW. N. BrandtDepartment of Astronomy and Astrophysics, Eberly College of Science, Penn State University, 525 Davey Laboratory, University Park, PA 16802, USAN. GehrelsAstrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAD. GrupeSpace Science Center, Morehead State University, 235 Martindale Drive, Morehead, KY 40351, USAJ. A. KenneaDepartment of Astronomy and Astrophysics, Eberly College of Science, Penn State University, 525 Davey Laboratory, University Park, PA 16802, USAC. S. KochanekCenter for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Ave, Columbus, OH 43210, USAJ. A. NousekDepartment of Astronomy and Astrophysics, Eberly College of Science, Penn State University, 525 Davey Laboratory, University Park, PA 16802, USAI. PapadakisDepartment of Physics and Institute of Theoretical and Computational Physics, University of Crete, GR-71003 Heraklion, GreeceM. SiegelDepartment of Astronomy and Astrophysics, Eberly College of Science, Penn State University, 525 Davey Laboratory, University Park, PA 16802, USAD. StarkeySUPA Physics and Astronomy, University of St. Andrews, Fife, KY16 9SS Scotland, UKP. UttleyAstronomical Institute “Anton Pannekoek,” University of Amsterdam, Postbus 94249, NL-1090 GE Amsterdam, The NetherlandsS. VaughanUniversity of Leicester, Department of Physics and Astronomy, Leicester, LE1 7RH, UKS. YoungDepartment of Astronomy, University of Maryland, College Park, MD 20742-2421, USAAaron J. BarthDepartment of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA 92697M. C. BentzDepartment of Physics and Astronomy, Georgia State University, 25 Park Place, Suite 605, Atlanta, GA 30303, USAB. J. BrewerDepartment of Statistics, The University of Auckland, Private Bag 92019, Auckland 1142, New ZealandD. M. CrenshawDepartment of Physics and Astronomy, Georgia State University, 25 Park Place, Suite 605, Atlanta, GA 30303, USAE. Dalla BontàDipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, ItalyA. De Lorenzo- CáceresSUPA Physics and Astronomy, University of St. Andrews, Fife, KY16 9SS Scotland, UKK. D. DenneyCenter for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Ave, Columbus, OH 43210, USAM. DietrichDepartment of Physical and Earth Sciences, Worcester State University, 486 Chandler Street, Worcester, MA 01602, USAJ. ElySpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAM. M. FausnaughDepartment of Astronomy, The Ohio State University, 140 W 18th Ave, Columbus, OH 43210, USAC. J. GrierDepartment of Astronomy and Astrophysics, Eberly College of Science, Penn State University, 525 Davey Laboratory, University Park, PA 16802, USAP. B. HallDepartment of Physics and Astronomy, York University, Toronto, ON M3J 1P3, CanadaJ. KaastraDepartment of Physics and Astronomy, Univeristeit Utrecht, P.O. Box 80000, 3508 Utrecht, The NetherlandsB. C. KellyDepartment of Physics, University of California, Santa Barbara, CA 93106, USAK. T. KoristaDepartment of Physics, Western Michigan University, 1120 Everett Tower, Kalamazoo, MI 49008-5252, USAP. LiraDepartamento de Astronomia, Universidad de Chile, Camino del Observatorio 1515, Santiago, ChileS. MathurCenter for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Ave, Columbus, OH 43210, USAH. NetzerSchool of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, IsraelA. PancoastDepartment of Physics, University of California, Santa Barbara, CA 93106, USAL. PeiDepartment of Physics and Astronomy, Georgia State University, 25 Park Place, Suite 605, Atlanta, GA 30303, USARichard W. PoggeCenter for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Ave, Columbus, OH 43210, USAJ. S. SchimoiaDepartment of Astronomy, The Ohio State University, 140 W 18th Ave, Columbus, OH 43210, USATommaso TreuDepartment of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547, USAM. VestergaardDark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, DenmarkC. VillforthSUPA Physics and Astronomy, University of St. Andrews, Fife, KY16 9SS Scotland, UKH. YanDepartment of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USAY. ZuDepartment of Astronomy, The Ohio State University, 140 W 18th Ave, Columbus, OH 43210, USA
2015en
ABI
Аннотация
Recent intensive Swift monitoring of the Seyfert 1 galaxy NGC 5548 yielded 282 usable epochs over 125 days across six UV/optical bands and the X-rays. This is the densest extended active galactic nucleus (AGN) UV/optical continuum sampling ever obtained, with a mean sampling rate &lt;0.5 day. Approximately daily Hubble Space Telescope UV sampling was also obtained. The UV/optical light curves show strong correlations () and the clearest measurement to date of interband lags. These lags are well-fit by a wavelength dependence, with a normalization that indicates an unexpectedly large disk radius of lt-day at 1367 , assuming a simple face-on model. The U band shows a marginally larger lag than expected from the fit and surrounding bands, which could be due to Balmer continuum emission from the broad-line region as suggested by Korista and Goad. The UV/X-ray correlation is weaker () and less consistent over time. This indicates that while Swift is beginning to measure UV/optical lags in general agreement with accretion disk theory (although the derived size is larger than predicted), the relationship with X-ray variability is less well understood. Combining this accretion disk size estimate with those from quasar microlensing studies suggests that AGN disk sizes scale approximately linearly with central black hole mass over a wide range of masses.
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