Thermal non thermal plasma interactions in clusters
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Thermal / Non-thermal plasma Interactions in Clusters. The Good, the Bad & the Puzzling. L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100. The BIG Questions. • How can relativistic plasmas, seen through synchrotron radiation, reveal the dynamics and evolution of clusters?

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Thermal / Non-thermal plasma Interactions in Clusters

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Thermal / Non-thermal plasmaInteractions in Clusters

The Good, the Bad & the Puzzling

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


The BIG Questions

• How can relativistic plasmas, seen through synchrotron radiation, reveal the dynamics and evolution of clusters?

SYNCHROTRON, clues to  DYNAMICS ?

• How does the dynamics of the thermal plasma affect the growth of the magnetic field and the acceleration of relativistic particles?

DYNAMICS causes  B field and CRs ?

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


GOOD NEWS: хорошие новости

• AGN influences on thermal X-ray plasma are well

documented (heating, cavities, etc)

• Shocks seen in radio, sometimes in X-ray & S-Z, are consistent

with expectations from theory, connected to cluster mergers

• Radio halos likely result from expected turbulence in mergers

Key Messages

ЮрийНикулин

BAD NEWS:плохиеновости

• Mach numbers expected from simulations and measured in X-ray inconsistent with spectral index of radio emission.

• Missing shocks, either radio or X-ray

PUZZLING NEWS: головоломки

• Mild mergers with no shocks also produce giant radio halos.

• 3D structure of giant shock in Abell 2256 is not simple to explain

• Radio galaxies sometimes seen at edge of shocks – why?

Max Otto von Stierlitz

Максим Максимович Исаев

L. Rudnick MN Inst. for Astrophysics Zeldovich 100

with support from U.S. NSF, AST112195


The GOOD News

PASSIVE

ACTIVE

Radio galaxy  ICM interactions

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


The GOOD News

Vazza et al. 2012, MNRAS 421 1868

• Merger shocks:

simulations and observed relics

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


Keeping electrons energized: CRe lifetimes ~ 108 yCRediffusion times ~ 1010 y

The GOOD News

Merger-driven turbulence

W. Couch

M. Owers

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


Halos

DISTURBED

The GOOD News

Cassano+ 2011

• Radio halos 

mergers

RELAXED

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


Consistent shock story - Radio, X-ray, S-Z

X-RAY

A. Simionescu et al. 2013 ApJ 775 4

The GOOD News

RADIO

S-Z

Brown & Rudnick, 2011

Planck intermediate results. X. Physics of

the hot gas in the Coma cluster, 2013

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


The BAD News

Mismatched Mach numbers ?

X-ray shock

Ogrean+2013

ainj=

-0.6 to -0.7

X-ray shock

radio spectrum

M < 2

3.3 < M < 4.6

van Weeren+ 12

radio spectrum


The BAD News

Do shocks look too efficient?

Tension with g-ray limits?


The BAD News

X-ray shock

Radio shock

Why the

offset?

Where’s the

radio shock?


The PUZZLING News

Exploring

low surface brightness

radio emission

PUZZLING

головоломки

Farnsworth+2013

L. Rudnick, MN Inst. for Astrophysics, Zeldovich 100


The PUZZLING News

Can MILD mergers  Giant Radio Halos?

X-Ray

RADIO

Rossetti+ 2013

Abell 2142

Farnsworth+ 2013


The PUZZLING News

Abell 2256 – where’s the shock?

Radio

X-ray

with F. Owen, NRAO & J. Eilek, NMIMT


The PUZZLING News

Abell 2256 – where’s the shock?

Flat spectrum

Steep spectrum

with F. Owen, NRAO & J. Eilek, NMIMT


The PUZZLING News

Radio Galaxy – relic/shock connection?

van Weeren+ 2010

Bonafede+14

Pizzo+2010


GOOD NEWS: хорошие новости

• AGN influences on thermal X-ray plasma are well

documented (heating, cavities, etc)

• Shocks seen in radio, sometimes in X-ray & S-Z, are consistent

with expectations from theory, connected to cluster mergers

• Radio halos likely result from expected turbulence in mergers

Key Messages

ЮрийНикулин

BAD NEWS:плохиеновости

• Mach numbers expected from simulations and measured in X-ray inconsistent with spectral index of radio emission.

• Missing shocks, either radio or X-ray

PUZZLING NEWS: головоломки

• Mild mergers with no shocks also produce giant radio halos.

• 3D structure of giant shock in Abell 2256 is not simple to explain

• Radio galaxies sometimes seen at edge of shocks – why?

Max Otto von Stierlitz

Максим Максимович Исаев

L. Rudnick MN Inst. for Astrophysics Zeldovich 100

with support from U.S. NSF, AST112195


radio.galaxyzoo.org


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