مقاله Optical spectral decomposition of NGC 4051 : تی پی بین

خلاصه مقاله

Considering the host galaxy contribution, a spectral decomposition method is used to reanalyzed the archive data of optical spectra for a narrow line Seyfert 1 galaxy, NGC 4051. The light curves of the continuum f λ (5100 Å), and Hβ, He ii, Fe ii emission lines are given. We find strong flux correlations between line emissions of Hβ, He ii, Fe ii and the continuum f λ (5100 Å). These low-ionization lines (Hβ, Fe ii, He ii) have “inverse” intrinsic Baldwin effects. Using the methods of the cross-correlation function and the Monte Carlo simulation, we find the time delays, with respect to the continuum, are 3.45+12.0−0.5 days with the probability of 34 % for the intermediate component of Hβ, 6.45+13.0−1.0 days with the probability of 65 % for the intermediate component of He ii. From these intermediate components of Hβ and He ii, the calculated central black hole masses are 0.86+4.35−0.33×106 and 0.82+3.12−0.45×106 M⊙ . We also find that the time delays for Fe ii are 9.7+3.0−5.0 days with the probability of 36 %, 8.45+1.0−2.0 days with the probability of 18 % for the total epochs and “subset 1” data, respectively. It seems that the Fe ii emission region is outside of the Hβ emission region.

نویسندگان

Zhen Yang [ Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210097, China ]

Wei-Hao Bian [ Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210097, China ]

YueFeng Wang [ Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210097, China ]

کلمات کلیدی

Active galactic nuclei NGC 4051 Emission line Black hole

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Astrophysics and Space Science 2013

Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered.The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing.Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.Commonly used title abbreviations: Astrophys Space Sci, Ap SS

حوزه های تحت پوشش : Astrophysics and Astroparticles Astronomy, Observations and Techniques Cosmology Extraterrestrial Physics, Space Sciences Astrobiology