Difficulties with the QPOs resonance model
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Transcript of Difficulties with the QPOs resonance model
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Difficulties with the QPOs Difficulties with the QPOs resonance modelresonance model
by Paola Rebusco
Jean-Pierre Lasota’s Birthday Conference 2007
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Lekcja pierwsza
Wiedzieć, że wiemy to co wiemy i wiedzieć, że nie wiemy tego czego nie
wiemy, oto prawdziwa wiedza.
Mikołaj Kopernik
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
First Lesson
Wiedzieć, że wiemy to co wiemy i wiedzieć, że nie wiemy tego czego nie wiemy, oto prawdziwa wiedza.
Mikołaj Kopernik
To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.
Nicolaus Copernicus
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
High frequency (kHz) QPOs
In Black Holes: stable
In Neutron Stars: the peaks move-much
more rich phenomenology (state, spin, Q)
T
. Str
ohm
ayer
20
01
M
. van d
er
Klis
20
00
1/M scaling -> orbital motion
3:2…although not always
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Difficulties according to…
“I do not believe in your model”Jean-Pierre Lasota
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Difficulties according to…
Outsiders: Tomaso Belloni
Insiders: A&K Team
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Outsiders
1)NEUTRON STARS“The biggest limit of the model is that it does
not work” T.B.
The two frequencies are in 3:2 ratio, but they are related in such a way that they move away from the 3:2 ratio.
= spin or spin/2 (NO!Mendez&Belloni 2007) No explanation of the direct observables (NO
MODEL DOES)
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
What is wrong with the Bursa line?
(32)(3+2)=65!
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Weakly nonlinear coupled oscillators
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Perturbed geodesics (numerics&theory)
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
BUT…
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Outsiders
2)BLACK HOLESStable3:2, [ GRS 1915+150 (5:3)..]
“on those small numbers” (4) “the model works”TB
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Insiders - BH vs NS
Different modulation (see Michal Bursa’s talk)
Different excitation
Different mechanism (Outsider)?
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Insiders- SIMULATIONS
Slender tori slightly out of equilibrium do not produce QPOs (only transient - Mami Machida)
They do if the torus is kicked HOWEVER it is difficult to recognize
the modes
(Omer Blaes, Chris Fragile, Mami Machida, Eva Sramkova)
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Insiders - EXCITATION MECHANISM
Direct forcing (NS rotation?but spin)
Stochastic forcing (BH?)
Disk instabilities (Mami Machida’s simulations: P&P instability)
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Turbulence? (Vio et al 2005)
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
The “right” turbulence feeds the resonance
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Insiders - DAMPING
Stochastic damping ?!?
What controls the coherence Q= /? Didier Barret et al. - Qlow>Qhigh
- Qlow increases with
and drops
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Insiders - EPI or NOT EPI?!?
EPI: - Pressure and gravity coupling? NO!!! (slender torus-Jiri Horak)… the advantage is that they survive to damping - non axisymmetric modes?NONOT EPI: - the eigenfreq. depend on thermodynamics -> 1/M ?!? - g-modes (but do not survive) which modes are special?
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Modes and Spin (A&K, Michal Bursa, Eva Sramkova, Odele Straub)
Kerr geometry
Method 1= Ramesh Narayan group
Method 2= Middleton Group
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
Is it the end?
Thin disks
Non - constant l
a and
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Paola Rebusco --- Jean-Pierre Lasota’s Bday 2007
HAPPY BIRTHDAY