the milky way our home galaxy - prof. lloyd's...
TRANSCRIPT
Universe 1
Astronomy 25 1
The Milky Way
Our home galaxy.
Astronomy 25 2
Milky Way
The Milky Way
The Milky Way over the Alps
Astronomy 25 3
Milky Way
Changing Ideas
!Galileo (1610): the Milky Way is stars
!Herschel (1800): the Big Wheel
!Shapley (1917): the Sun isn't at the center
!Trumpler (1930): interstellar "dust" absorbs light
William Herschel
Universe 2
Astronomy 25 4
Milky Way
The Sun is Not in the Center
!Shapley plottedglobular clusters.
!Center of Galaxy is8 kpc away
!Re-affirmed theCopernicanPrinciple
Harlow Shapley
Astronomy 25 5
Milky Way
The Milky Way From Earth
North American Nebula Galactic Center
Great Sagittarius
Star Cloud
Cygnus Loop
The Great Rift
Astronomy 25 6
Milky Way
Structure of the Galaxy
Galaxy in infrared.
Universe 3
Astronomy 25 7
Milky Way
A Spiral Galaxy
Spiral arms
Central bulge
M83 in Hydra
Astronomy 25 8
Milky Way
Structure
!Halo
"No gas
"Old starsDark matter
!Bulge
"Some gas
"Old stars
!Disk
"Gas + dust
"Young starskpc = kiloparsec
Astronomy 25 9
Milky Way
Halo
!Globular clusters
!Single old stars
e.g. Arcturus
M4 in ScorpiusCharles Messier
Universe 4
Astronomy 25 10
Milky Way
Globular Clusters
!About 200 known
!100,000 - 1,000,000 stars
!20-100 pc in diameter
!>10 billion years old
!Most toward center ofgalaxy
M3 in Canes Venatici
Astronomy 25 11
Milky Way
Globular Clusters
47 Tucanae
Astronomy 25 12
Milky Way
Globular Clusters
Omega Centauri
Universe 5
Astronomy 25 13
Milky Way
The Disk
Based on radio
observations
of H at 21 cm
!Spiral arms
"Bright O and B stars
"Dust and gas
Astronomy 25 14
Milky Way
Density Wave Theory
!Stars move faster than waves
!Traffic jam
Astronomy 25 15
Milky Way
A Barred Spiral!
Universe 6
Astronomy 25 16
Milky Way
Contents of Disk
! Open Clusters
! Diffuse Nebulae
"Emission nebulae
"Reflection nebulae
"Dark nebulae
! Planetary Nebulae
! Mass ejection nebulae
! Supernova Remnants
NGC 6559
Astronomy 25 17
Milky Way
Open Clusters
Jewelbox Cluster
in Crux
•10-100s of stars
•Young
•Irregular shape
Astronomy 25 18
Milky Way
Open Clusters
M7 in Scorpius
Universe 7
Astronomy 25 19
Milky Way
Open Clusters
M50 in Monoceros
Astronomy 25 20
Milky Way
Diffuse Nebulae
Great Orion Nebula (M42)
•Star formationregions
•Hot and coldgas clouds
•Red light is Ha
Astronomy 25 21
Milky Way
Emission Nebulae
Lagoon Nebula
Trifid Nebula
Universe 8
Astronomy 25 22
Milky Way
Emission Nebulae
Trifid Nebula (M20)
Sagittarius
Astronomy 25 23
Milky Way
Emission Nebulae
Lagoon Nebula
(M8)
Astronomy 25 24
Milky Way
Emission Nebulae
Center of Lagoon Nebula
(HST)
Universe 9
Astronomy 25 25
Milky Way
Emission Nebulae
Eagle Nebula (M16)
In Serpens
Astronomy 25 26
Milky Way
Emission Nebulae
Astronomy 25 27
Milky Way
Reflection Nebulae
M78 in Orion
Universe 10
Astronomy 25 28
Milky Way
Dark Nebulae
Astronomy 25 29
Milky Way
Dark Nebulae
NGC281
Astronomy 25 30
Milky Way
Diffuse NebulaeAntares
M4
Universe 11
Astronomy 25 31
Milky Way
Planetary Nebulae
Ring Nebula (M57)
in Lyra
Astronomy 25 32
Milky Way
Planetary Nebulae
Dumbbell Nebula (M27)
in Vulpecula
Astronomy 25 33
Milky Way
Planetary Nebulae
Universe 12
Astronomy 25 34
Milky Way
Planetary Nebulae
NGC 3132 in Antlia
Astronomy 25 35
Milky Way
Mass Loss Nebulae
HD 44179 (HST)
Astronomy 25 36
Milky Way
Mass Loss Nebulae
Universe 13
Astronomy 25 37
Milky Way
Supernova Remnants
Crab Nebula (M1)
in Taurus
Astronomy 25 38
Milky Way
Supernova Remnants
Supernova 1006
in Lupus
Astronomy 25 39
Milky Way
Supernova Remnants
Tycho's Supernova
Universe 14
Astronomy 25 40
Milky Way
Supernova Remnants
Gum Nebula
in southern
Milky Way
Astronomy 25 41
Milky Way
Supernova Remnants
S147 in
Taurus
Astronomy 25 42
Milky Way
The Center of the Galaxy
Center of
Galaxy
M22
Lagoon
Neb.
Sagittarius
Universe 15
Astronomy 25 43
Milky Way
The Center at 1 Meter
Astronomy 25 44
Milky Way
The Center of the Galaxy
5 pc
Astronomy 25 45
Milky Way
The Center of the Galaxy
Speed of orbiting stars-> supermassive blackhole 3 million Msun
Universe 16
Astronomy 25 46
Milky Way
The Center in X-Rays
Astronomy 25 47
Milky Way
The Center in IR
Astronomy 25 48
Milky Way
Our Galaxy