A massive multiphase plume of gas in Abell 2390’s brightest cluster galaxy

Rose, Tom; McNamara, B R; Combes, F; Edge, A C; Russell, H; Salomé, P; Tamhane, P; Fabian, A C; Tremblay, G

Abstract

We present new ALMA CO(2-1) observations tracing 2.2 × 1010 M. of molecular gas in Abell 2390’s brightest cluster galaxy, where half the gas is located in a one-sided plume extending 15 kpc out from the galaxy centre. This molecular gas has a smooth and positive velocity gradient, and is receding 250 km s−1 faster at its farthest point than at the galaxy centre. To constrain the plume’s origin, we analyse our new observations alongside existing X-ray, optical, and radio data. We consider the possibility that the plume is a jet-driven outflow with lifting aided by jet-inflated X-ray bubbles, is a trail of gas stripped from the main galaxy by ram pressure, or is formed of more recently cooled and infalling gas. The galaxy’s star formation and gas cooling rate suggest the lifespan of its molecular gas may be low compared with the plume’s age – which would favour a recently cooled plume. Molecular gas in close proximity to the active galactic nucleus is also indicated by 250 km s−1 wide CO(2-1) absorption against the radio core, as well as previously detected CO(1-0) and H I absorption. This absorption is optically thick and has a line-of-sight velocity towards the galaxy centre of 200 km s−1. We discuss simple models to explain its origin.

Citation

Rose, T., McNamara, B. R., Combes, F., Edge, A. C., Russell, H., Salomé, P., …Tremblay, G. (2024). A massive multiphase plume of gas in Abell 2390’s brightest cluster galaxy. Monthly Notices of the Royal Astronomical Society, 528(2), 3441-3455. https://doi.org/10.1093/mnras/stae213

• Journal Article Type: Article
• Acceptance Date: Jan 15, 2023
• Online Publication Date: Jan 19, 2024
• Publication Date: 2024-02
• Deposit Date: Mar 19, 2024
• Publicly Available Date: Mar 19, 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: 528
• Issue: 2
• Pages: 3441-3455
• DOI: https://doi.org/10.1093/mnras/stae213
• Public URL: https://durham-repository.worktribe.com/output/2332968