Journal
ASTROPHYSICAL JOURNAL
Volume 927, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac4225
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Funding
- European Organization for Astronomical Research in the Southern Hemisphere under ESO program [196.B-0578]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [833824]
- grant PRIN MIUR 2017 [20173ML3WW_001]
- INAF mainstream funding program
- ASI-INAF [2017-14-H.0]
- CONICYT PAI (Concurso Nacional de Insercion en la Academia 2017) grant [79170132]
- FONDECYT Iniciacion 2018 grant [11180558]
- UNAM-DGAPA-PAPIIT IN111620 grant, Mexico
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This study combines MUSE observations and literature survey to robustly measure the AGN fraction in ram-pressure-stripped cluster galaxies. The results show a strong correlation between the AGN fraction and stellar mass, with a significantly higher incidence of AGN activity in ram-pressure-stripped galaxies compared to nonstripped galaxies.
Ram pressure stripping (RPS) by the intracluster medium is one of the most advocated mechanisms that affect the properties of cluster galaxies. A recent study based on a small sample has found that many galaxies showing strong signatures of RPS also possess an active galactic nucleus (AGN), suggesting a possible correlation between the two phenomena. This result has not been confirmed by a subsequent study. Building upon previous findings, here we combine MUSE observations conducted within the GASP program and a general survey of the literature to robustly measure the AGN fraction in ram-pressure-stripped cluster galaxies using Baldwin-Phillips-Terlevich emission line diagrams. Considering a sample of 115 ram-pressure-stripped galaxies with stellar masses >= 10(9) M (circle dot), we find an AGN fraction of similar to 27%. This fraction strongly depends on stellar mass: it raises to 51% when only ram-pressure-stripped galaxies of masses M (*) >= 10(10) M (circle dot) are considered. We then investigate whether the AGN incidence is in excess in ram-pressure-stripped galaxies compared to nonstripped galaxies using as a comparison a sample of noncluster galaxies observed by the MaNGA survey. Considering mass-matched samples, we find that the incidence of AGN activity is significantly higher (at a confidence level >99.95%) when RPS is in the act, supporting the hypothesis of an AGN-ram pressure connection.
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