Stellar populations in local AGNs: evidence for enhanced star formation in the inner 100 pc

Dahmer-Hahn, L G; Riffel, Rogério; Rodríguez-Ardila, A.; Riffel, Rogemar A.; Storchi‐Bergmann, Thaisa; Marinello, Murilo; Davies, R. I.; Burtscher, L.; Ruschel-Dutra, D.; Rosario, D. J.

doi:10.1093/mnras/stab3382

Cited by 12 publications

(9 citation statements)

References 81 publications

(98 reference statements)

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“…We found average age uncertainties in analysed AGN (non-AGN) of 2% (3%), 3% (5%) and 3% (4%) in the case of the young, intermediate, and old ages, respectively. We found that obtained average uncertainties are in line with previous studies (e.g., Cid Fernandes et al 2014;Burtscher et al 2021;Dahmer-Hahn et al 2022). The measured averaged uncertainties are included in Figure 3.…”

Section: Stellar Populations Of Fir Agn and Fir Non-agn Green Valley ...supporting

confidence: 92%

“…These identified the dominance of the older stellar populations (e.g. Lotz et al 2000;Renzini 2006;Gargiulo et al 2012;Sil'chenko et al 2012;Dahmer-Hahn et al 2018;Ferré-Mateu et al 2019;Lonoce et al 2020;Zibetti et al 2020;Dahmer-Hahn et al 2022), which had a total metallicity between less than half-solar to higher values (e.g. Lotz et al 2000;Lonoce et al 2020;Zibetti et al 2020) and enhanced α-elements over iron (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Stellar populations of a sample of far-IR AGN and non-AGN green valley galaxies

Mahoro,

Pović,

Väisänen

et al. 2022

Preprint

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We present a study on the stellar populations and stellar ages of a sub-sample of farinfrared AGN and non-AGN green valley galaxies analysed in Mahoro et al. (2017Mahoro et al. ( , 2019 at 0.6 < z < 1.0 using the data from the COSMOS field. We used long-slit spectroscopy and derived stellar populations and stellar ages using the stellar population synthesis code "STARLIGHT" and analysed the available Lick/IDS indices, such as Dn4000 and Hδ A . We find that both FIR AGN and non-AGN green valley galaxies are dominated by intermediate stellar populations 67% and 53%, respectively. The median stellar ages for AGN and non-AGN are log t = 8.5 [yr] and log t = 8.4 [yr], respectively. We found that majority of our sources (62% of AGN and 66% of non-AGN) could have experienced bursts and continuous star formation. In addition, most of our FIR AGN (38%) compared to FIR non-AGN (27%) might have experienced a burst of SF more than 0.1 Gyr ago. We also found that our FIR AGN and non-AGN green valley galaxies have similar quenching time-scales of ∼ 70 Myr. Therefore, the results obtained here are in line with our previous results where we do not find that our sample of FIR AGN in the green valley shows signs of negative AGN feedback, as has been suggested previously in optical studies.

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Section: Stellar Populations Of Fir Agn and Fir Non-agn Green Valley ...supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Stellar populations of a sample of far-IR AGN and non-AGN green valley galaxies

Mahoro,

Pović,

Väisänen

et al. 2022

Preprint

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“…Another difference between our results and theirs is the fact that in all their AGNs except one, the light is dominated by old SPs, whereas this is the case for only two of our galaxies (NGC 3227 and NGC 5548). A similar analysis was done by Dahmer-Hahn et al (2021), who analyzed the stellar populations using optical IFU data of 14 AGN (being the optical counterpart of the present sample). Similarly to the results of Burtscher et al (2021), nine of their objects have evidence of young SPs in the inner 150 pc, with an average light contribution of 7 %.…”

Section: Discussionmentioning

confidence: 71%

Gemini NIFS survey of feeding and feedback processes in nearby Active Galaxies: VI -- Stellar Populations

Riffel,

Dahmer-Hahn,

Riffel

et al. 2022

Preprint

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We use Gemini Near-Infrared Integral Field Spectrograph (NIFS) adaptive optics assisted data-cubes to map the stellar population of the inner few hundred parsecs of a sample of 18 nearby Seyfert galaxies. The near infrared light is dominated by the contribution of young to intermediate old stellar populations, with light-weighted mean ages < 𝑡 > 𝐿 1.5 Gyr. Hot dust (𝐻𝐷) emission is centrally peaked (in the unresolved nucleus), but it is also needed to reproduce the continuum beyond the nucleus in nearly half of the sample. We have analysed the stellar population properties of the nuclear region and their relation with more global properties of the galaxies. We find a correlation between the X-ray luminosity and the contributions from the 𝐻𝐷, featureless continuum 𝐹𝐶 and reddening 𝐴 𝑉 . We attribute these correlations to the fact that all these properties are linked to the mass accretion rate to the active galactic nuclei (AGN). We also find a correlation of the bolometric luminosity 𝑙𝑜𝑔(𝐿𝐵𝑜𝑙 𝑜𝑏𝑠 ) with the mass-weighted mean age of the stellar population, interpreted as due a delay between the formation of new stars and the triggering/feeding of the AGN. The gas reaching the supermassive black hole is probably originated from mass loss from the already somewhat evolved intermediate age stellar population (< 𝑡 > 𝐿 1.5 Gyr). In summary, our results show that there is a significant fraction of young to intermediate age stellar populations in the inner few 100 pc of active galaxies, suggesting that this region is facing a rejuvenation process in which the AGN, once triggered, precludes further star formation, in the sense that it can be associated with the lack of new star formation in the nuclear region.

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“…The one possible exception to this rather boring normality is that a number of groups have found evidence that the star formation rate in the immediate vicinity of the AGN is often elevated [48,56,67,340].…”

Section: Star Formationmentioning

confidence: 99%

Infrared Spectral Energy Distribution and Variability of Active Galactic Nuclei: Clues to the Structure of Circumnuclear Material

Lyu

Rieke

2022

Universe

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The active galactic nucleus (AGN) phenomenon results from a supermassive black hole accreting its surrounding gaseous and dusty material. The infrared (IR) regime provides most of the information to characterize the dusty structures that bridge from the galaxy to the black hole, providing clues to the black hole growth and host galaxy evolution. Over the past several decades, with the commissioning of various ground, airborne and space IR observing facilities, our interpretations of the AGN circumnuclear structures have advanced significantly through an improved understanding of how their dust emission changes as a function of wavelength and how the heating of the dusty structures responds to variations in the energy released from the central engine. In this review, we summarize the current observational knowledge of the AGN IR broad-band spectral energy distributions (SEDs) and the IR time variability behavior covering large ranges of AGN luminosity and redshift, and discuss some first-order insights into the obscuring structures and host galaxy IR properties that can be obtained by integrating the relevant observations into a coherent picture.

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Stellar populations in local AGNs: evidence for enhanced star formation in the inner 100 pc

Cited by 12 publications

References 81 publications

Stellar populations of a sample of far-IR AGN and non-AGN green valley galaxies

Stellar populations of a sample of far-IR AGN and non-AGN green valley galaxies

Gemini NIFS survey of feeding and feedback processes in nearby Active Galaxies: VI -- Stellar Populations

Infrared Spectral Energy Distribution and Variability of Active Galactic Nuclei: Clues to the Structure of Circumnuclear Material

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