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PX269 Galaxies
Dr Peter Wheatley
[email protected] Office: PS009
PX269 Galaxies
Books
PX269 Galaxies
£45
£25
Books II
PX269 Galaxies
£30
£35
Part 1: Introduction
1.1 Historical overview
PX269 Galaxies
The Milky Way
PX269 Galaxies
Wei-Hao Wang
University of Hawaii
Galileo Galilei
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1609
Mountains and
craters on the
moon
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Sunspots
Galileo’s sketch
Cassini probe
Saturn’s rings
Jupiter’s moons
Europa
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Io
Ganymede
Callisto
Kurt Friedrich
SIDEREAL MESSENGER
unfolding great and very wonderful sights
and displaying to the gaze of everyone,
but especially philosophers and astronomers,
the things that were observed by
GALILEO GALILEI,
Florentine patrician
and public mathematician of the University of Padua,
with the help of a spyglass lately devised by him,
about the face of the Moon, countless fixed stars,
the Milky Way, nebulous stars,
but especially about
four planets
flying around the star of Jupiter at unequal intervals
and periods with wonderful swiftness;
which, unknown by anyone until this day,
the first author detected recently
and decided to name
MEDICEAN STARS
The Starry Messenger, Galileo Galilei 1610
Milky Way
PX269 Galaxies
Wei-Hao Wang
University of Hawaii
Wei-Hao Wang
University of Hawaii
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Milky Way and a “spiral nebula”
1750s
Thomas Wright
Immanuel Kant
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Angular momentum and disc geometries
Rich Townsend, UCL
Wei-Hao Wang
University of Hawaii
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Charles Messier
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Andromeda Galaxy = M31 = NGC 224
Andromeda Galaxy = M31 = NGC
Lord224
Rosse
72” telescope
1845
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Cepheid variables as standard candles
Magnitude
Log Period [d]
Henrietta Swan Leavitt
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100-inch Mt Wilson telescope
Edwin Hubble
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Hubble Space Telescope
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M 51 the Whirlpool Galaxy
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The Milky Way
PX269 Galaxies
Wei-Hao Wang
University of Hawaii
Hubble Deep Field
1,000,000 sec
exposure
Seeing 100 billion
times fainter than
human eye…
…and half way back
to the beginning of
time.
PX269 Galaxies
Part 1: Introduction
1.2 Galaxy classification
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100-inch Mt Wilson telescope
Edwin Hubble
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Hubble Space Telescope
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M87
an
elliptical
galaxy
CFHT
NGC 2768
an elliptical galaxy
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M 51 the Whirlpool Galaxy
NGC 1300 a barred spiral galaxy
Dust extinction in the Sombrero Galaxy = M 104
NGC 1427A
a dwarf
irregular galaxy
M 51 the Whirlpool Galaxy
Hertzsprung-Russell
(HR) Diagram
PX269 Galaxies