SIMBAD references

2021ApJ...909...18F - Astrophys. J., 909, 18-18 (2021/March-1)

Reverberation mapping of changing-look active galactic nucleus NGC 3516.

FENG H.-C., HU C., LI S.-S., LIU H.T., BAI J.M., XING L.-F., WANG W.-Y., YANG Z.-X., XIAO M. and LU K.-X.

Abstract (from CDS):

The changes of broad emission lines should be a crucial issue in understanding the physical properties of changing-look active galactic nuclei (CL-AGNs). Here we present the results of an intensive and homogeneous 6 month long reverberation mapping (RM) monitoring campaign during a low-activity state of the CL-AGN Seyfert galaxy NGC 3516. Photometric and spectroscopic monitoring was carried out during 2018-2019 with the Lijiang 2.4 m telescope. The sampling is 2 days in most nights, and the average sampling is ∼3 days. The rest-frame time lags of Hα and Hβ are τ=7.56–2.10+4.42 and τ=7.50–0.77+2.05 days, respectively. From an rms Hβ line dispersion of σline = 1713.3 ± 46.7 km s–1 and a virial factor of fσ = 5.5, the central black hole mass of NGC 3516 is estimated to be MBH=2.4–0.3+0.7×107M, which is in agreement with previous estimates. The velocity-resolved delays show that the time lags increase toward negative velocity for both Hα and Hβ. The velocity-resolved RM of Hα is done for the first time. These RM results are consistent with other observations before the spectral-type change, indicating a basically constant broad-line region structure during the CL process. The CL model of changes of accretion rate seems to be favored by long-term Hβ variability and RM observations of NGC 3516.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Active galaxies - Photometry - Reverberation mapping - Seyfert galaxies - Spectroscopy - Supermassive black holes

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 16

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