An external galaxy; a spiral like our own.. Which way does it rotate?

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Presentation transcript:

An external galaxy; a spiral like our own.

Which way does it rotate?

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve? WRONG!

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

An edge-on spiral; we can measure its rotation

An external galaxy; a spiral like our own. How does it rotate? i.e. what is rotation curve?

We believe that only 10% of the mass of this object is baryonic matter (in the form of stars, stellar remnants, interstellar gas, interstellar dust) and the other 90% is “dark matter”

Vera Rubin showed that 90 % of a typical galaxy’s mass is “ dar k matter ”

Except for the closest few galaxies, they are all moving away from us (fast!)

Last 4 lectures - cosmology monday wednesay friday monday 3/6

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