The balance of cooling + AGN heating in galaxy cluster cores Helen - - PowerPoint PPT Presentation

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The balance of cooling + AGN heating in galaxy cluster cores Helen - - PowerPoint PPT Presentation

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The balance of cooling + AGN heating in galaxy cluster cores Helen Russell Brian McNamara Alastair Edge Rupal Mittal Clif Kirkpatrick Andy Fabian Jeremy Sanders Chris O'Dea Outline Radiative cooling in clusters AGN cavity heating

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SLIDE 1

The balance of cooling + AGN heating in galaxy cluster cores

Helen Russell Brian McNamara Alastair Edge Rupal Mittal Clif Kirkpatrick Andy Fabian Jeremy Sanders Chris O'Dea

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SLIDE 2
  • Radiative cooling in clusters
  • AGN cavity heating and metal outflows
  • Tracing residual cool gas with Spitzer and

Herschel

  • Future observations with Alma

Outline

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Radiative cooling in cluster cores

Voigt & Fabian 2004

Chandra image of Abell 2029

Lewis et al. 2003, Allen et al. 2004

  • 100 – 1000 solar masses per year cooling?
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SLIDE 4

Reduced cooling

Fe XVII

Peterson et al. 2003

  • Searches for vast reservoir of molecular gas and

star formation find less than 10% of that expected

  • High resolution X-ray spectra find reduced cooling
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Cavity heating

Hydra A, Kirkpatrick et al. 2009 MS0735, McNamara et al. 2005 Perseus Fabian et al. 2008

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Cavity heating

Hydra A, Kirkpatrick et al. 2009 MS0735, McNamara et al. 2005 Perseus Fabian et al. 2008

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SLIDE 7

E = 4PV

Cavity heating

Hydra A, Kirkpatrick et al. 2009 MS0735, McNamara et al. 2005 Perseus Fabian et al. 2008

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SLIDE 8

Gas dynamics

M87, Werner et al. 2010 Perseus, Fabian et al. 2011

Hα

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Metal outflows

Kirkpatrick et al. 2009, Simionescu et al. 2009 Kirkpatrick et al. 2011

→ 100 solar masses per year outflow

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Heating + cooling balance

  • AGN heating is

energetically sufficient to offset radiative cooling.

Rafferty et al. 2006

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Heating + cooling balance

  • AGN heating is

energetically sufficient to offset radiative cooling.

  • AGN heating can

be coupled to the cooling gas → feedback

Rafferty et al. 2006

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Tracing the residual cooling gas

O'Dea et al. 2008

  • Spitzer IR survey
  • f star formation

in cluster cores

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Herschel observations

  • Herschel-PACS first detections of the strongest

atomic cooling lines [CII], [OI],... in cool core clusters

Mittal et al. 2011

[CII] X-ray 0.5-1keV Hα Centaurus cluster

~107K ~104K ~60K

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Herschel observations

  • FIR lines have kinematics similar to the ionised

gas ...

Mittal et al. 2011, Canning et al. 2011

Hα + [NII] [CII]

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Herschel observations

Edge et al. 2010

  • ... and the molecular gas.
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Alma – a feedback loop?

  • Spatial and velocity structure of the molecular gas
  • Determine if AGN are fuelled by accretion from cold

circumnuclear disks

  • True feedback?
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Alma – a feedback loop?

Abell 1664 Abell 1835

Hα Lyα Lyα Rband

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SLIDE 18

Conclusions

  • X-ray cavities provide a measure of the

mechanical power injected by the SMBH

  • AGN heating is energetically sufficient to offset

radiative cooling in cluster cores

  • Measures of reduced cooling from the X-ray are

converging with star formation rates

  • Herschel reveals similar morphology and

dynamics of cooling gas

  • Alma will uncover how AGN feedback is fuelled

and regulated

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Tracing the residual cooling gas

O'Dea et al. 2008

  • Spitzer IR survey
  • f star formation

in cluster cores

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SLIDE 21

Perseus cluster

Canning et al. 2011