Dark Matter Dark Matter There is a lot

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Dark Matter

Dark Matter

• Dark Matter – There is a lot of matter in the Universe

• Dark Matter – There is a lot of matter in the Universe that we can’t see • Dark Energy – The name given to the energy causing the Universe to expand, whatever it may be – Einstein called it the “Cosmological Constant”

Dark Matter in Spiral Galaxies • Construct rotation curves for other galaxies using HI

Dark Matter in Spiral Galaxies • Construct rotation curves for other galaxies using HI clouds • External galaxies also show flat curves • Mass-to-light ratios show that dark matter is 10 x more abundant the luminous matter

Dark Matter in Elliptical Galaxies • Rotation curves not possible in ellipticals – No

Dark Matter in Elliptical Galaxies • Rotation curves not possible in ellipticals – No HI gas – No disk • Look at width of absorption lines – Due to superposition of different doppler shifts • Velocity appears to stay the same to large radii, similar to flat rotation curve in spirals

Dark Matter in Galaxy Clusters • Evidence for dark matter from: – Orbits of

Dark Matter in Galaxy Clusters • Evidence for dark matter from: – Orbits of galaxies – Hot intracluster gas temperatures – Gravitation lensing

Orbits • Mass determined from orbital motions • Mass determined from luminosity • Two

Orbits • Mass determined from orbital motions • Mass determined from luminosity • Two masses are very different – MOrbit > 10 Mlum • Dark matter must outweight normal matter by at least 10 x

Intracluster Gas • Temperature of gas tells us the total mass of the galaxy

Intracluster Gas • Temperature of gas tells us the total mass of the galaxy cluster – Gas is in gravitational equilibrium • Strength of gravity requires T~107 K – Emits X-rays • Mcluster >> Mgas

Gravitational Lensing • Gravitational well due to mass of cluster bends light passing near

Gravitational Lensing • Gravitational well due to mass of cluster bends light passing near cluster • The more mass in the cluster, the more the light is bent

Gravitational Lensing • Gravitational well due to mass of cluster bends light passing near

Gravitational Lensing • Gravitational well due to mass of cluster bends light passing near cluster • The more mass in the cluster, the more the light is bent • Not enough luminous matter to bend light as much as observed

Dark matter makes up ~90% of the Universe • Current theory suggests WIMPs as

Dark matter makes up ~90% of the Universe • Current theory suggests WIMPs as candidate dark matter particles • Ma. CHOs no longer really accepted

Large Scale Structure of the Universe

Large Scale Structure of the Universe

Development of Structure • Dark matter crucial to the development of structure – Normal

Development of Structure • Dark matter crucial to the development of structure – Normal matter is not nearly abundant enough • Gravity pulls dark matter into clumps

Development of Structure • Over time, matter forms filaments and bigger clumps, which are

Development of Structure • Over time, matter forms filaments and bigger clumps, which are the homes of galaxy clusters

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Lot Width Minimums Lot Width and Lot SizeLot Width Minimums Lot Width and Lot Size
Lot Width Minimums Lot Width and Lot SizeLot Width Minimums Lot Width and Lot Size
MATTER MATTER Matter MATTER What is matter MatterMATTER MATTER Matter MATTER What is matter Matter
Light Dark Matter Sector 2017 Light Dark MatterLight Dark Matter Sector 2017 Light Dark Matter
DarklyCharged Dark Matter Double Disk Dark Matter andDarklyCharged Dark Matter Double Disk Dark Matter and
Dark Matter and LHC The Dark Matter AwakensDark Matter and LHC The Dark Matter Awakens
Evidence for Dark Matter What is Dark MatterEvidence for Dark Matter What is Dark Matter
Dark Matter in our Galactic Halo Dark MatterDark Matter in our Galactic Halo Dark Matter
Dark Matter LSP wino dark matter satellite dataDark Matter LSP wino dark matter satellite data
Dark Matter v Evidence for Dark Matter vDark Matter v Evidence for Dark Matter v
Dark Matter and Energy Rocky I Dark MatterDark Matter and Energy Rocky I Dark Matter
Dark Matter Searches Summary of NSF Dark MatterDark Matter Searches Summary of NSF Dark Matter
Outline Evidence for dark matter Dark matter candidatesOutline Evidence for dark matter Dark matter candidates
Gravitino Dark matter the darkest dark matter CouplingGravitino Dark matter the darkest dark matter Coupling