Program: GS-2021A-DD-106
Title: | Optical follow-up of the recent transition in the ‘Changing Look’ AGN NGC2992 |
PI: | Muryel Guolo Pereira |
Co-I(s): | Daniel Ruschel Dutra |
Abstract
Changing Look (CL) Active Galactic Nuclei (AGN) are a rare class of AGNs whose optical spectra classification change with time by losing/gaining Balmer broad emission lines (BEL). On an ongoing study on the long-term variability of the AGN in NGC2992 (Guolo-Pereira et al., in prep) we were able to show that that the presence (and flux) of the broad H\alpha emission line is directly correlated with the 2-10 keV X-ray luminosity(L_{2−10}): a minimum value of L_{2−10}≈4×10^{42} erg s^{-1} is necessary for its appearance, which translates to a eddington rate of 2%. An ongoing XRT/Swift follow-up of the galaxy shows that the galaxy has crossed this transition value again recently (first week of March), from its previous bright state to a faint state. We, therefore, ask for optical GMOS-IFU observation of the galaxy, to confirm our prediction on the correlation between X-ray luminosity and the presence/absence of BELs in this rare CL-AGN.
Publications using this program's data
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[data]
[ADS] Investigating changing-look active galactic nuclei with long-term optical and X-ray observations