: Mod. I (L.Secco) : Mod. II (G.Galletta) · Galaxy dynamics - Mod. II (G. Galletta) Motions in the...
Transcript of : Mod. I (L.Secco) : Mod. II (G.Galletta) · Galaxy dynamics - Mod. II (G. Galletta) Motions in the...
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: Mod. I (L.Secco): Mod. II (G.Galletta): Mod. II (G.Galletta)
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Galaxy dynamics - Mod. II (G. Galletta)
Motions in the milky Way: Velocity ellipsoid near the Sun. Oort formulae.
Mass distribution of stars in galaxies: Surface brightness laws of galaxies. Freeman, De Vaucouleurs and Sersic laws. Deduction of the main parameters from the observations.
The tridimensional shape of galaxies. Statistical methods. Inclination of a galaxy: principal planes and methods to find inclination and line of the nodes. Polar ring and other reference planes. Twisting of the isophotes. Twisting of the isophotes.
Rotation curve of a galaxy. Mass estimate with simple models
Observing galaxies at other wavelenghts: HI and CO lines. Observing techniques in our and other galaxies.
Estimate of the gas mass inside a galaxy by means of HI, CO and IR observations.
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The sequence
• Module I is divided into two Parts:
• I Part- starts nowand ends before Easter
• II Part- startsat the end of May-beginning• II Part- startsat the end of May-beginningof June and ends at about 15 June.
• INSIDE THE GAP: MODULE II
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About contents:
what is the location of Mod.I contents inside the history of contents inside the history of
Universe?
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• Phase 0=TOE; Phase1=GUT;
• Phase2=E-W unification
-43 -370
3
2
1
-11 -5
a
-37
Log t (sec)
+19 +15 +2
Log E (GeV)
250 MeV
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Hadrons have been formed at:
Quarks----->Hadrons
phase-transition
at about 10^-5 sec.
We’ll see it inside the environment ofinteraction trends
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As density and temperature decreasedecrease
matter transforms
from plasma toward neutral matter
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From a mixture of matter and radiation impossible to
disintangle
we move gradually to a decoupling between matter and radiation.
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Recombination
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Radiation needs a very long time to interact with matter
so that matter and radiation get two different temperatures:
breaking of thermodynamical symmetry
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Breaking of thermodynamical symmetry
t_exp
t
t_exp
t_inter
t_rec
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That allows gravity to act on the matter freelymatter freely
without something like viscosity due to radiation.
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After recombination the Universe is engaged to structure itself at a
macroscopic level.macroscopic level.
Here is the location of our Course!
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A very interesting interplay between the micro and macro
structure formations:• The micro allowthe macro ones but inside
these latests, e.g. inside stars in galaxies, the complexityof micro-structuresmaycomplexityof micro-structuresmayincrease.
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The macro structure formation appears as a Thermodynamic
challenge:challenge:
it drives to an apparent violation of the II Thermodynamical Principle,
we have to consider.
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The very small initial density fluctuations may increase thanks
to Jeans’ Instability.
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Jeans’Gravitational Instability
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Density perturbation occurs inside Hubble expansion.
At the maximum expansion phase:
t_max, t_max,
t the perturbation stops to
follow the Hubble flow. It becomes
a proto-structure which begins to collapse under
its auto-gravity
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It has to reach an equilibrium configuration. What kind of
equilibrium and in which way ?
The equilibrium is virial equilibrium. The way is the violent relaxation.
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It occurs the transition from the maximum expansion phase
toward virialization,via the violent relaxation mechanism which distributes the total energy by
conserving its total amount.
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Landau damping oscillations
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What is the role of Dark Matter inside which the baryonic matter
is embedded?
Where the double structure built up of Where the double structure built up of ordinary matter (=baryons) and DM will
land ?
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The fate of a baryonic perturbation on a given mass scale
changes under the sucking effect due to the DM potential well which helps it to reach the end of linear regime.
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Where the double structure does land at virialization?land at virialization?
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Analogy with stars:
MS is an one -dimensional structure embedded inside a two -dimensional embedded inside a two -dimensional
one.
The dimensionality of FP is two inside a three dimensional space.
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( heuristic case)
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Faber –Jakson law
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Main books 1. J. Binney, S. Tremaine, 2008, II Edition,
Galactic Dynamics, Princet. University Press.
2. Coles, P., Lucchin, F., 1995, Cosmology, The Origin and Evolution of Cosmic Structure, ed. Origin and Evolution of Cosmic Structure, ed. J.Wiley e Sons.
3. Longair: Galaxy Formation, 1998, ed. Springer.
4. Galaxy Formation and Evolution, H.Mo, F. van den Bosch and S.White, 2010, ed. Cambridge University Press.
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Moreover
5. I.S. Sokolnikoff : Tensor Analysis, ed. J.Wiley &Sons, 1964
6. J.B. Hartle : Gravity, An Introduction to Einstein’s General Relativity, ed. Addison Wesley, 2003
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Some more references are in the Lecture NotesLecture Notes
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Lecture Notes, 2015
• Secco L., Bindoni D.: Galaxy Dynamics-ed.5
• Secco L.: Monography: On the Fundamental Plane-ed.5
• Secco L.: Monography: Cosmological Scenarios-ed.5• Secco L.: Monography: Cosmological Scenarios-ed.5
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Exam
• N.2 written tests: the first at obout 15 April,
immediately after Easter, on the first Part;
• the last at the end of the Course (about 15 June), on the last Part.June), on the last Part.
• If both are positive, examination is passed
• To improve the graduation + oral discussion.
• N.1 final, common, oral exam on the whole course content.