69052 - ASTROFISICA DELLE ALTE ENERGIE

Conoscenze e abilità da conseguire

Al termine del corso, lo studente acquisisce una panoramica dei metodi e strumenti di rivelazione della radiazione in banda X, nonchè delle proprietà fisiche delle varie popolazioni di sorgenti galattiche/extragalattiche la cui emissione è rivelata in tale banda.

Contenuti

INTRODUCTION TO HIGH-ENERGY ASTROPHYSICS

• Recap on emission mechanisms: blackbody/bremsstrahlung/synchrotron/Compton scattering and Inverse Compton scattering, and some examples in the field of high-energy Astrophysics. Line production. Plasma physics (collisional and ionization equilibrium)

• History of the high-energy Astronomy. Excursus on the properties of the main X-ray/Gamma-ray satellites of the 'golden age'.

• Detection techniques for high-energy photons. X-ray and Gamma-ray detectors; CCDs in X-rays. Wolter-type telescopes and coded-aperture masks. Cerenkov radiation.

ACCRETION PHYSICS:

• Theory, Eddington limit, accretion discs. Accretion and ejection processes (jets, winds)

• Physics of compact objects: white dwarfs, Chandrasekhar limit, neutron stars, pulsars, black holes (with some mentions on relativistic astrophysics)

HIGH-ENERGY ASTROPHYSICS: GALACTIC

• X-ray emission from Solar System objects.

• Stellar X-ray Astronomy: main-sequence (MS) and pre-MS stars/very low-mass stars.

• X-ray binaries: phenomenology, classification and physical properties. Cataclysmic variables,Low- and High-mass X-ray binaries, candidates black holes.
  

• The Galactic Center: a multi-wavelength perspective. Emission from point-like and extended X-ray/Gamma-ray sources. Properties of the Fermi bubbles and other extended features. Matter infalling onto SgrA*.

• Ultraluminous X-ray sources
  

HIGH-ENERGY ASTROPHYSICS: EXTRA-GALACTIC

• Clusters of galaxies and cooling flows
  

• Active Galactic Nuclei (AGN): X-ray spectral components in X-rays: models vs. observations.

• X-ray surveys in the last decade. AGN contribution to the cosmic X-ray background. Open issues.
  
  
• Gamma ray bursts: phenomenologies, origin and emission mechanisms. Link to Gravitational waves and multi-messenger astrophysics

Testi/Bibliografia

MAIN/REFERENCE TEXT:

• Malcolm S. Longair: "High-Energy Astrophysics", Cambridge University Press

OTHER KEY RESOURCES:

• George B. Rybicky, Alan P. Lightman: "Radiative Processes in Astrophysics", Wiley

• J. Frank, A. King & D. Raine: "Accretion Power in Astrophysics", Cambridge University Press

For each lecture, few (at most) selected resources (papers, slides of seminars, web-pages) will be given to complement the material on the Longair's book.

The slides used during the lectures will be also made available, at the end of the lecture.

Metodi didattici

Lectures with the aid of slides and blackboard. From time to time, during the lecture we will critically analyze recent publications and/or reviews on the lecture topics. Time will also be devoted to "questions and answer" sessions at the end of the macro-topics.

During the course few lectures will be devoted to specialistic seminars (2 hours each) given by colleagues of INAF-OAS and CTA, on future perspectives on high-energy astrophysics studies and synergies with theory/modelling.

 

Modalità di verifica e valutazione dell'apprendimento

Oral exam where the candidate should demonstrate to have an organic view of the discipline. The exam will start with a topic chosen by the student. The candidate should be able to deduce relations among physical quantities related to high-energy astrophysics in a non mnemonic way.

Strumenti a supporto della didattica

Blackboard and presentations of powerpoint slides.

Orario di ricevimento

Consulta il sito web di Marcella Brusa