Presentazione

Organizzazione della Didattica

DM270
ASTRONOMIA ORD. 2010

Galaxy Dynamics

6

AstroMundus

 

Frontali Esercizi Laboratorio Studio Individuale
ORE: 48 0 0 85

Periodo

AnnoPeriodo
I anno2 semestre

Frequenza

Obbligatoria

Erogazione

Convenzionale

Lingua

Inglese

Calendario Attività Didattiche

InizioFine
01/03/201611/06/2016

Tipologia

TipologiaAmbitoSSDCFU
caratterizzanteAstronomico-teoricoFIS/056


Responsabile Insegnamento

ResponsabileSSDStruttura
Prof. GALLETTA GIUSEPPEFIS/05Dipartimento di Fisica e Astronomia "Galileo Galilei"

Altri Docenti

DocenteCoperturaSSDStruttura
Prof. SECCO LUIGI ENRICOContrattoN.D.

Attività di Supporto alla Didattica

Non previste

Bollettino

A basic knowledge of Astrophysical concepts about stars and galaxies from previous courses of Astronomy. Basic elements of Astrophysics, Structure of the Matter, Theoretical physics

Knowledge of the galaxy evolution mechanisms, Capability to compute total masses of gas and stars in galaxies from observations.

Lectures with and without power point slides.

These lectures are composed by two sections: a theoretical one (3 CFU) and a practical one (3 CFU) Theory on galaxy dynamics: The cosmological framework: birth of modern cosmology. Cosmological Principles; Einstein's equations (by analogy), Robertson-Walker metric. Friedmann’s Equations, Einstein's and de Sitter’s solutions. Crucial phases of the cosmological evolution; Jeans instability, Bonnor reformulation, role of dark matter; spherical collapse of a density perturbation. Structures on galaxy mass scales in the CDM scenario and their phases before virialization. The thermodynamic perspective: entropy and information; violent relaxation mechanism in phase-space; Landau-damping and virialization. Stress tensor and anisotropies of peculiar velocities in the dynamics of stellar systems. The Fundamental Plane of galaxies and the scale relationships. Theoretical interpretations. Weak homology. The tensor virial theorem for one and two-component system . The Clausius virial: tidal energy and interaction energy. Connection with the cosmological scenarios. The cosmic metaplane. Observations of galaxy dynamics: 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. 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.

Oral exam or, if requested by the most part of the students, written exam (five questions with open-length answer)

Capability to answer to the questions, directed to understand if the student is able to solve the problems on mass, kinematics and structure of the galaxies.

CONTENUTO NON PRESENTE

Papers for readings: BINDONI D, SECCO L. (2008). Violent relaxation in phase-space. NEW ASTRONOMY REVIEWS, vol. 52; p. 1-18, ISSN: 1387-6473. D'ONOFRIO M, VALENTINUZZI T, SECCO L., CAIMMI R, BINDONI D (2006). Toward understanding the origin of the fundamental plane for early-type galaxies. NEW ASTRONOMY REVIEWS, vol. 50; p. 447-460, ISSN: 1387-6473. SECCO L., BINDONI D (2009). On the tilt of Fundamental Plane by Clausius' virial maximum theory. NEW ASTRONOMY, vol. 14; p. 567-578, ISSN: 1384-1076 PowerPoint presentations in digital form or printed slides. Additional support: photocopies from scientific papers and books.