RECORD
The environment of AGN dwarf galaxies at z$\sim$0.7 from the VIPERS survey
Astrophysics of Galaxies · Submitted 24 Oct 2022
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Our work demonstrates that AGN and non-AGN dwarf galaxies reside in similar environments at intermediate redshift suggesting that the environment is not an important factor in triggering AGN activity already since z = 0.9.
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
Open the compiled record
The abstract, sentence by sentence
Dwarf galaxies are ideal laboratories to study the relationship between the environment and AGN activity. However, the type of environments in which dwarf galaxies hosting AGN reside is still unclear and limited to low-redshift studies (z < 0.5). We use the VIMOS Public Extragalactic Redshift Survey (VIPERS) to investigate, for the first time, their environments at 0.5 < z < 0.9. We select a sample of 12,942 low-mass ($\rm{log}(M_\mathrm{*}/M_{\odot})\leq10$) galaxies and use the emission-line diagnostic diagram to identify AGN. We characterise their local environments as the galaxy density contrast, $\delta$, derived from the fifth nearest neighbour method. Our work demonstrates that AGN and non-AGN dwarf galaxies reside in similar environments at intermediate redshift suggesting that the environment is not an important factor in triggering AGN activity already since z = 0.9. Dwarf galaxies show a strong preference for low-density environments, independently of whether they host an AGN or not. Their properties do not change when moving to denser environments, suggesting that dwarf galaxies are not gas-enriched due to environmental effects. Moreover, AGN presence does not alter host properties supporting the scenario that AGN feedback does not impact the star formation of the host. Lastly, AGN are found to host over-massive black holes. This is the first study of dwarf galaxies hosting AGN at z > 0.5. The next generation of deep surveys will reveal whether or not such lack of environmental trends is common also for faint higher-redshift dwarf galaxy populations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Dwarf galaxies are ideal laboratories to study the relationship between the environment and AGN activity. | background 1.00 | 0.05 | 0.02 | asserted 1.00 |
| s1 | However, the type of environments in which dwarf galaxies hosting AGN reside is still unclear and limited to low-redshift studies (z < 0.5). | gap 1.00 | 0.04 | 0.02 | asserted 0.97 |
| s2 | We use the VIMOS Public Extragalactic Redshift Survey (VIPERS) to investigate, for the first time, their environments at 0.5 < z < 0.9. | contribution 0.80 | 0.94 | 0.03 | asserted 0.88 |
| s3 | We select a sample of 12,942 low-mass ($\rm{log}(M_\mathrm{*}/M_{\odot})\leq10$) galaxies and use the emission-line diagnostic diagram to identify AGN. | method 0.99 | 0.96 | 0.02 | asserted 0.95 |
| s4 | We characterise their local environments as the galaxy density contrast, $\delta$, derived from the fifth nearest neighbour method. | method 1.00 | 0.97 | 0.02 | asserted 0.97 |
| s5 | Our work demonstrates that AGN and non-AGN dwarf galaxies reside in similar environments at intermediate redshift suggesting that the environment is not an important factor in triggering AGN activity already since z = 0.9. | interpretation 0.68 | 0.95 | 0.88 | asserted 0.64 |
| s6 | Dwarf galaxies show a strong preference for low-density environments, independently of whether they host an AGN or not. | result 1.00 | 0.93 | 0.15 | asserted 1.00 |
| s7 | Their properties do not change when moving to denser environments, suggesting that dwarf galaxies are not gas-enriched due to environmental effects. | interpretation 0.62 | 0.89 | 0.08 | asserted 0.50 |
| s8 | Moreover, AGN presence does not alter host properties supporting the scenario that AGN feedback does not impact the star formation of the host. | interpretation 0.71 | 0.87 | 0.08 | asserted 0.71 |
| s9 | Lastly, AGN are found to host over-massive black holes. | result 1.00 | 0.92 | 0.05 | asserted 1.00 |
| s10 | This is the first study of dwarf galaxies hosting AGN at z > 0.5. | contribution 0.97 | 0.76 | 0.04 | asserted 1.00 |
| s11 | The next generation of deep surveys will reveal whether or not such lack of environmental trends is common also for faint higher-redshift dwarf galaxy populations. | future work 1.00 | 0.06 | 0.03 | hedged possibility 0.71 |
What was examined, and what was not
- arXiv listing abstract v1
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
The paper
Original abstract
Dwarf galaxies are ideal laboratories to study the relationship between the environment and AGN activity. However, the type of environments in which dwarf galaxies hosting AGN reside is still unclear and limited to low-redshift studies (z < 0.5). We use the VIMOS Public Extragalactic Redshift Survey (VIPERS) to investigate, for the first time, their environments at 0.5 < z < 0.9. We select a sample of 12,942 low-mass ($\rm{log}(M_\mathrm{*}/M_{\odot})\leq10$) galaxies and use the emission-line diagnostic diagram to identify AGN. We characterise their local environments as the galaxy density contrast, $\delta$, derived from the fifth nearest neighbour method. Our work demonstrates that AGN and non-AGN dwarf galaxies reside in similar environments at intermediate redshift suggesting that the environment is not an important factor in triggering AGN activity already since z = 0.9. Dwarf galaxies show a strong preference for low-density environments, independently of whether they host an AGN or not. Their properties do not change when moving to denser environments, suggesting that dwarf galaxies are not gas-enriched due to environmental effects. Moreover, AGN presence does not alter host properties supporting the scenario that AGN feedback does not impact the star formation of the host. Lastly, AGN are found to host over-massive black holes. This is the first study of dwarf galaxies hosting AGN at z > 0.5. The next generation of deep surveys will reveal whether or not such lack of environmental trends is common also for faint higher-redshift dwarf galaxy populations.
Human review
References
How the literature uses it
5 arXiv papers cite this in 5 sentences
What it cites · 3 sentences without a confident label
Uses the method or tool of 1 paper
-
To further confirm the similarity of the AGN and SF(control) galaxy properties, we use a machine-learning based classification in multi-dimensional space introduced by [ref] (see also [ref] and Siudek et al. submitted).
Cites as background 1 paper
-
The $NUVrK$ diagram is a colour-colour space commonly used to separate different galaxy types: passive (red), intermediate (green), and active (blue) [ref] .
The VIMOS Public Extragalactic Redshift Survey (VIPERS): A quiescent formation of massive red-sequence galaxies over the past 9 Gyr · NUVrK diagram · 0.84
Discussion
Know something about this paper? Leave a comment, or highlight any passage above to comment on it.