Observational constraints on the stellar recycled gas in active galactic nuclei feeding
Monthly Notices of the Royal Astronomical Society(2024)
摘要
Near-infrared long-slit spectroscopy has been used to study the stellar
population (SP) of the low luminosity active galactic nuclei (AGN) and matched
analogues (LLAMA) sample. To perform the SP fits we have employed the X-shooter
simple stellar population models together with the code. Our main
conclusions are: The star formation history of the AGNs is very complex,
presenting many episodes of star formation during their lifetimes. In general,
AGN hosts have higher fractions of intermediate-age SP (light-weighted mean
ages, _L≲ 4.5 Gyr) when compared with their analogues
(_L≲ 8.0 Gyr). AGN are more affected by reddening and require
significant fractions of featureless continuum and hot dust components. The
ratio between the AGN radiated energy and the gravitational potential energy of
the molecular gas (E_Rad/E_PG) for the AGN is compared with the and a possible anti-correlation is observed. This suggests that the AGN is
affecting the star formation in these galaxies, in the sense that more
energetic AGN (log(E_Rad/E_PG) ≳ 3) tend to host nuclear younger
SP (_L ≲4Gyr). We found that the recent (t<2 Gyr) returned
(recycled) stellar mass is higher in AGN than in the controls. We also provide
evidence that the mass loss of stars would be enough to feed the AGN, thus
providing observational constraints for models that predict that AGN feeding is
partially due to the recycled gas from dying stars.
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