WISDOM project - VIII. Multiscale feedback cycles in the brightest cluster galaxy NGC 0708
Artikel i vetenskaplig tidskrift, 2021

We present high-resolution (synthesized beam size 0 ''.088 x 0 ''.083 or 25 x 23 pc(2)) Atacama Large Millimetre/submillimetre Array (CO)-C-12(2-1) line and 236 GHz continuum observations, as well as 5 GHz enhanced Multi-Element Radio Linked Interferometer Network (e-MERLIN) continuum observations, of NGC 0708; the brightest galaxy in the low-mass galaxy cluster Abell 262. The line observations reveal a turbulent, rotating disc of molecular gas in the core of the galaxy, and a high-velocity, blueshifted feature approximate to 0.'' 4(approximate to 113pc) from its centre. The submillimetre continuum emission peaks at the nucleus, but extends towards this anomalous CO emission feature. No corresponding elongation is found on the same spatial scales at 5 GHz with e-MERLIN. We discuss potential causes for the anomalous blueshifted emission detected in this source, and conclude that it is most likely to be a low-mass in-falling filament of material condensing from the hot intracluster medium via chaotic cold accretion, but it is also possible that it is a jet-driven molecular outflow. We estimate the physical properties this structure has in these two scenarios, and show that either explanation is viable. We suggest future observations with integral field spectrographs will be able to determine the true cause of this anomalous emission, and provide further evidence for interaction between quenched cooling flows and mechanical feedback on both small and large scales in this source.

ISM: jets and outflows

galaxies: active

galaxies: clusters: intracluster medium

galaxies: individual: NGC 0708

galaxies: elliptical and lenticular, cD

galaxies: kinematics and dynamics



Cardiff University

Timothy A. Davis

Cardiff University

Martin Bureau

University of Oxford

Yonsei University

Massimo Gaspari

Istituto nazionale di astrofisica (INAF)

Princeton University

Michele Cappellari

University of Oxford

Satoru Iguchi

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences

Lijie Liu

University of Oxford

Kyoko Onishi

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Ehime University

Marc Sarzi

Armagh Observatory and Planetarium

Mark D. Smith

University of Oxford

Thomas G. Williams


Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 503 4 5179-5192


Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi

Fusion, plasma och rymdfysik



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