Week 4: Light / Solar System HW 2 past due (any submission before - PowerPoint PPT Presentation

Week 4: Light / Solar System HW 2 past due (any submission before now is OK) HW 3 due on Thursday @ 10:45am Read Ch. 5 (except 5.5), and 7.1, 8.1-2, 11.1-2 for Thursday ASTR/PHYS 2500: Foundations Astronomy Fall 2020: Week 03 1

JCMT ALMA Life on Mars VENUS ?!?!?! ASTR/PHYS 2500: Foundations Astronomy Fall 2020: Week 03 2

<latexit sha1_base64="STxWXR7tpGVxIUjG4Vm4zWTgYDw=">ACJHicbVBNS8MwGE7n15xfVQ8iXoJD8DTaeXAgwlAPHie4D1jLSN0C0vTkqTCLPsxXvwrXjxMxYMe9OrPMPsQdPOFhIfng+R9vJhRqSzrzcjMzS8sLmWXcyura+sb5uZWTUaJwKSKIxaJhockYZSTqKkUYsCAo9Rupe93yo12+IkDTi16oXEzdEbU4DipHSVMs8uYWn0AkEwqlzQZhC0GE67aN+gNmDzRor5aZt4qWKOBs8CegHy59DnYef/arbTMZ8ePcBISrjBDUjZtK1ZuioSimJF+zkiRHuojZpashRSKSbjpbswPN+DCIhD5cwRH7O5GiUMpe6GlniFRHTmtD8j+tmaig5KaUx4kiHI8fChIGVQSHjUGfCoIV62mAsKD6rxB3kC5E6V5zugR7euVZUCsW7KNC8Uq3cQbGkwV7YB8cAhscgzK4BVQBRjcgQcwAE/GvfFovBivY2vGmGS2wZ8xPr4BaiCpGg=</latexit> unshifted Doppler Shift “blueshifted” z = ∆ λ = ∆ ν λ ν “redshifted” unshifted Allows us to infer motions along the “line of sight” ASTR/PHYS 2500: Foundations Astronomy Fall 2020: Week 03 3

Lines are not delta functions! i.e., the difference b/t energy levels is NOT exact Motion-induced Broadening (small Doppler shifts cause Other Types of Broadening lines to appear more broad) • Thermal Broadening • Natural Broadening • Rotational Broadening • Pressure Broadening • Turbulent Broadening • Zeeman Broadening broadened ASTR/PHYS 2500: Foundations Astronomy Fall 2020: Week 03 4

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<latexit sha1_base64="HudVlDgkiTtqQ3UZlwQENzvQOg=">AB/XicbVDLSgMxFM3UV62v8bFzE1qEilhnRFB3RTcuK9gHdIYhk6Y1NMkMSUYh+JP+AFuXCji1v9w178xfSy09cCFwzn3cu89Ycyo0o4ztHILi0vLK/nVwtr6xuaWvb3TUFEiManjiEWyFSJFGBWkrqlmpBVLgnjISDPsX4/85gORikbiTqcx8TnqCdqlGkjBfZe2RPJsanAOYQn0FO0x1Fgl5yKMwacJ+6UlKpF7+h5WE1rgf3tdSKcCI0ZkiptuvE2s+Q1BQzMih4iSIxwn3UI21DBeJE+dn4+gE8MEoHdiNpSmg4Vn9PZIgrlfLQdHKk79WsNxL/89qJ7l74GRVxonAk0XdhEdwVEUsEMlwZqlhiAsqbkV4nskEdYmsIJwZ19eZ40TivuWeXy1qRxBSbIg31QBGXgnNQBTegBuoAg0fwAt7Au/VkvVof1uekNWdNZ3bBH1hfP3WblvE=</latexit> Broadened Line Shapes Lorentzian Profile Gaussian Profile (natural broadening) (realistic broadening) ( ν − ν 0 ) / σ ASTR/PHYS 2500: Foundations Astronomy Fall 2020: Week 03 6

Lines are not delta functions! i.e., the difference b/t energy levels is NOT exact Dense environments, frequent collisions induce Other Types of Broadening electric fields that modify energy levels • Natural Broadening • Pressure Broadening • Zeeman Broadening broadened ASTR/PHYS 2500: Foundations Astronomy Fall 2020: Week 03 7

Doppler Broadening Thermal Broadening ASTR/PHYS 2500: Foundations Astronomy Fall 2020: Week 03 8

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