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## PowerPoint Slideshow about ' <Dark Matter>' - galvin

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### <Dark Matter>

Lesson PlanGuided ResearchModel

Dr. Christian [email protected]://www.virtuelleschule.at/cosmos/

[1]

[2]

[1] Gravitational Lens, HST observation of Abell 2218

[2] Rotation curve (observed and theoretical), SuW 1/2005 S.32ff.

- General InformationThe scenario aims to illustrate one of the evidences for dark matter. This includes the study of the rotational curves of spiral galaxies.
- Duration: 3 x 50 min.
- Vocabulary: dark matter, galaxies, rotation curve
- Tools and Materials: PC with Internet connection, Paper, work sheets (excel, diagram), Pencil
- Aims and Objectives: Students should ...- ... be able to plot data- ... learn basics on the structure and detection of matter
- Students‘ Misconception:
- confusing types of matter

- visible parts of galaxies are dominant

- Educational Phase 1: Stimulation
- Presentation/Discussion:motivation by emotion (pictures of galaxies)

[1] HST observation of M51 „Whirlpool Galaxy“ [2] HST observation of M104 „Sombrero Galaxy“

- Educational Phase 2: Scientific Prediction
- Discuss list of possible dark matter candidates and their interactions with measurable quantities / indirect detection
- Draw up a list on the blackboard with various proposed methods and missions to detect dark matter
- Finding pictures of galaxies and their rotation curves(internet research)

[3] Doppler image of M33

[1] Illustration of the galaxies rotation (Sextans A)

[2] Interactive Applet on the Doppler effect

- Educational Phase 3: Experimental Activities
- Kepler rotation in the Solar System (central point mass)
- Applet with M(r) => v(r) [in development]

[1] Work sheet: Kepler rotation in the Solar System

[2] „rotcurve“-Applet of real galaxieshttp://burro.cwru.edu/JavaLab/RotcurveWeb/main.html

- Educational Phase 4: Abstraction of the finding
- Prediction Compared to Results:v2(r) = G * (Mvisible(r) + Mdark(r)) / rIf existing matter is only the observed (visible) matter, the rotation curves of spiral galaxies could not be described.Mtot > Mvisible => Mdark thus Mtot = Mvisible + MdarkWith assistance of Tutorials and Links.
- Discussion: Short discussion on detection methods and theoretical issues.

- Educational Phase 5: Consolidation
- Quiz/Multiple-Choice-Test with Feedback
- Exercises/Tasks:
- Comparing simple calculations and self-composed diagrams with obtained data
- Talk: Thoeretical background ist provided to find information on the internet to start a talk about types of dark matter
- Discussion: Change of paradigm of matter over the centuries

[1] Multiple-Choice-Test (ASTROID)

- Ressources:
- Worksheet (solar system; xls)
- Worksheet (diagram; pdf)
- Simulation (rotation curve; Applet)
- Glossary (of related terms; pdf)
- Examples with solutions and diagrams (for teachers; pdf)
- Informationsheet (types of matter; pdf)
- Informationsheet (posibilities of types of DM; pdf)
- Informationsheet (internetlinks and further infos; pdf)

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