DOE OSTI · 2575539
Directly imaging the cooling flow in the Phoenix cluster
Abstract
In the centres of many galaxy clusters, the hot (approximately 10 7 kelvin) intracluster medium can become dense enough that it should cool on short timescales. However, the low measured star formation rates in massive central galaxies and the absence of soft X-ray lines from the cooling gas suggest that most of this gas never cools. This is known as the cooling flow problem. The latest observations suggest that black hole jets are maintaining the vast majority of gas at high temperatures. A cooling flow has yet to be fully mapped through all the gas phases in any galaxy cluster. Here we present observations of the Phoenix cluster using the James Webb Space Telescope to map the [Ne vi] λ 7.652-μm emission line, enabling us to probe the gas at 10 5.5 kelvin on large scales. These data show extended [Ne vi] emission that is cospatial with the cooling peak in the intracluster medium, the coolest gas phases and the sites of active star formation. Taken together, these imply a recent episode of rapid cooling, causing a short-lived spike in the cooling rate, which we estimate to be 5,000–23,000 solar masses per year. As a result, these data provide a large-scale map of gas at temperatures between 10 5 kelvin and 10 6 kelvin in a cluster core, and highlight the critical role that black hole feedback has in not only regulating cooling but also promoting it.
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Reefe, Michael [Massachusetts Institute of Technology, Cambridge, MA (United States)] (ORCID:0000000347018497), McDonald, Michael [Massachusetts Institute of Technology, Cambridge, MA (United States)], Chatzikos, Marios [University of Kentucky, Lexington, KY (United States)], Seebeck, Jerome [University of Maryland, College Park, MD (United States)] (ORCID:0000000240149067), Mushotzky, Richard [University of Maryland, College Park, MD (United States)] (ORCID:0000000279625446), Veilleux, Sylvain [University of Maryland, College Park, MD (United States)], Allen, Steven W. [Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000306675941), Bayliss, Matthew [University of Cincinnati, OH (United States)], Calzadilla, Michael [Massachusetts Institute of Technology, Cambridge, MA (United States); Harvard & Smithsonian, Cambridge, MA (United States)], Canning, Rebecca [University of Portsmouth (United Kingdom)], Floyd, Benjamin [University of Missouri–Kansas City, MO (United States)] (ORCID:000000034175571X), Gaspari, Massimo [University of Modena and Reggio Emilia (Italy)] (ORCID:0000000327549258), Hlavacek-Larrondo, Julie [Université de Montréal, Montreal, QC (Canada)] (ORCID:0000000172717340), McNamara, Brian [University of Waterloo, ON (Canada)], Russell, Helen [University of Nottingham, University Park (United Kingdom)], Sharon, Keren [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000275590864), Somboonpanyakul, Taweewat [Chulalongkorn University, Bangkok (Thailand)] (ORCID:0000000335213631). 2025-02-05. Directly imaging the cooling flow in the Phoenix cluster. https://doi.org/10.1038/s41586-024-08369-x
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