# Star formation efficiency and AGN feedback in narrow-line Seyfert 1 galaxies with fast X-ray nuclear winds

**Authors:** Quentin Salomé, Yair Krongold, Anna Lia Longinotti, Manuela Bischetti, Santiago García-Burillo, Olga Vega, Miguel Sánchez-Portal, Chiara Feruglio, María Jesús Jiménez-Donaire, Maria Vittoria Zanchettin  
**arXiv:** [2307.06087](https://arxiv.org/abs/2307.06087)  
**Date:** 2023-07-12  
**Summary page:** https://www.summarizepaper.com/en/paper/2307.06087v1/

## Key points

- First systematic investigation of molecular gas and star formation efficiency in narrow-line Seyfert 1 galaxies with X-ray Ultra Fast Outflows
- CO observations obtained for six galaxies, while data from literature used for remaining four
- Parameters derived include stellar mass, star formation rate, AGN luminosity, and FIR dust luminosity
- Most galaxies lie above the main sequence observed in local star-forming galaxies
- Molecular depletion time shorter in AGN-hosting galaxies compared to local star-forming galaxies, indicating higher star formation efficiency
- Correlation observed between star formation efficiency and Eddington ratio and tentative correlation with AGN luminosity
- Minimal quenching of star formation due to AGN activity based on findings
- Ongoing starburst episodes may lead to gas exhaustion and cessation of star formation within a short timescale

## Summary

In this study, the authors present the first systematic investigation of the molecular gas and star formation efficiency in a sample of ten narrow-line Seyfert 1 galaxies. These galaxies were specifically selected to have X-ray Ultra Fast Outflows, which could potentially indicate the presence of active galactic nucleus (AGN) feedback effects. The authors obtained CO observations using the IRAM 30m telescope for six galaxies, while data from the literature was used for the remaining four. To analyze the properties of these galaxies, the authors derived various parameters such as stellar mass, star formation rate, AGN luminosity and FIR dust luminosity by fitting multi-band spectral energy distributions with the CIGALE code. The results revealed that most of these galaxies lie above what is known as the main sequence (MS), which represents a correlation between stellar mass and star formation rate observed in local star-forming galaxies. Furthermore, they found that molecular depletion time in these AGN-hosting galaxies is significantly shorter compared to typical values measured in local star-forming galaxies. This suggests that star formation is occurring at a much higher efficiency in these systems. Additionally, a promising correlation was observed between star formation efficiency and Eddington ratio (a measure of how efficiently an AGN is accreting matter), as well as a tentative correlation with AGN luminosity. The role played by AGN activity in regulating star formation within these galaxies remains uncertain; however it can be concluded that quenching of star formation due to AGN activity is minimal based on their findings. Instead it is suggested that ongoing starburst episodes will likely lead to gas exhaustion and cessation of star formation within a relatively short timescale. Overall this study provides valuable insights into understanding interplay between AGN activity, molecular gas properties and star formation efficiency in narrow-line Seyfert 1 galaxies; contributing to our knowledge on complex processes occurring within active galactic nuclei and their impact on host galaxy evolution.