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- W2038458033 abstract "One of the primary goals of AGN variability studies has been to determine the size of broad-line region (BLR) through the reverberation mapping technique. In a recent international multiwavelength spectroscopic monitoring campaign, NGC 4151 has been observed intensively by ground-based telescopes for a period of over 2 months, with a typical temporal resolution of 1 day. The main result from this optical campaign is that finding the variation in the emission line flux (Hβ or Hα) lagging the continuum by 0–3 days (1993 campaign: Kaspi et al. 1996). This is in contrast to the past results in which a time lag of 9±2 days was found for the same emission line (1988 campaign: Maoz et al. 1991). Such a BLR “size problem” may be caused by a different variability timescaie of the ionizing continuum or a real change in BLR gas distribution in the 5.5 yr interval between the two watch campaigns. In order to clarify which of the two possibilities is most likely the real case, we performed further reverberation analysis on both optical datasets." @default.
- W2038458033 created "2016-06-24" @default.
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- W2038458033 date "1998-10-01" @default.
- W2038458033 modified "2023-09-27" @default.
- W2038458033 title "Reverberation mapping analysis of the broad-line region in Seyfert galaxy NGC 4151" @default.
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- W2038458033 doi "https://doi.org/10.1016/s0275-1062(98)00051-4" @default.
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