Dust in the giant elliptical galaxy - evidence of collision of several spiral galaxies ?

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Presentation transcript:

Dust in the giant elliptical galaxy - evidence of collision of several spiral galaxies ?

Galactic Radio Arcs originating from the vicinity of the black hole in the galaxy center - plasma streaming along magnetic field lines ?

Same place - X rays due to the collision of the hot plasma with a cold cloud ?

Recent EIT 195 movie

Supernova in UV in another galaxy

שיעור 6 n מעבר הקרינה

Exercise: Syhchrotron emission from a power-law distribution Exercise: Power of inverse Compton scattering Exercise: Natural line profile

תצפיות הספק שטף האנרגיה כיוון תדר

קשר בין ערכים

Q: Isotropic intensity - what is the flux ?

צפיפות האנרגיה

שטף התנע

Q: Isotropic intensity - what is the pressure ? Q: Sun interior - flux ? pressure ?

משוואת המצב קרינה איזוטרופית דפנות מחזירות

פליטה ובליעה פליטה ספונטנית

Q: Initial intensity =0 ? Q: Emissivity = 0 ?

פליטה מאולצת ובליעה עומק אופטי

Q: Optical depth - physical sense ? Q: Dependence on the frame ?

פיזור בליעה ופליטה

Q: Diff eq ? Q: If non-isotropic scattering ?

משוואת מעבר הקרינה

פתרון מקרה פשוט

Q: No initial intensity - what is this ? Small and large optical depth ? Q: Only Thomson scattering in the Sun. What is the optical depth ? Q: How long travels light before leaving the Sun ?

גוף שחור

המשך

קרינה תרמית פליטה או בליעה

Q: Maximum intensity from a thermally emitting body ? Q: Where do the photons come from ? Q: Emission and absorption lines ? Q: Line shape (saturation) ?

פוטונים חופשיים

Q: Redshifted emission - intensity ?