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Observational constraints on the stellar recycled gas in active galactic nuclei feeding

Riffel, Rogério; Dahmer-Hahn, Luis G; Vazdekis, Alexandre; Davies, Richard; Rosario, David; Almeida, Cristina Ramos; Audibert, Anelise; Martín-Navarro, Ignacio; Martins, Lucimara Pires; Rodríguez-Ardila, Alberto; Riffel, Rogemar A; Storchi-Bergmann, Thaisa; Bertoldo-Coelho, Michele; Trevisan, Marina; Hicks, Erin; Müller, Allan Schnorr-; Marinho, Lais Nery; Veilleux, Sylvain

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Rogério Riffel

Luis G Dahmer-Hahn

Alexandre Vazdekis

Richard Davies

David Rosario

Cristina Ramos Almeida

Anelise Audibert

Ignacio Martín-Navarro

Lucimara Pires Martins

Alberto Rodríguez-Ardila

Rogemar A Riffel

Thaisa Storchi-Bergmann

Michele Bertoldo-Coelho

Marina Trevisan

Erin Hicks

Allan Schnorr- Müller

Lais Nery Marinho

Sylvain Veilleux


Near-infrared long-slit spectroscopy has been used to study the stellar population (SP) of the low luminosity active galactic nuclei (AGNs) and matched analogues (LLAMA) sample. To perform the SP fits we have employed the X-shooter simple stellar population models together with the STARLIGHT 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, <t > L ≲ 4.5 Gyr) when compared with their analogues (<t > L ≲ 8.0 Gyr). AGNs 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 (ERad/EPG) for the AGN is compared with the <t > L and a possible anticorrelation is observed. This suggests that the AGN is affecting the star formation in these galaxies, in the sense that more energetic AGN [log(ERad/EPG) ≳ 3] tend to host nuclear younger SP (<t > L ≲4 Gyr). 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.


Riffel, R., Dahmer-Hahn, L. G., Vazdekis, A., Davies, R., Rosario, D., Almeida, C. R., …Veilleux, S. (2024). Observational constraints on the stellar recycled gas in active galactic nuclei feeding. Monthly Notices of the Royal Astronomical Society, 531(1), 554-574.

Journal Article Type Article
Acceptance Date May 1, 2024
Online Publication Date May 6, 2024
Publication Date 2024-06
Deposit Date Jul 4, 2024
Publicly Available Date Jul 4, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 531
Issue 1
Pages 554-574
Public URL


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