Download - M101 – the Wonder Galaxy
![Page 1: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/1.jpg)
M101 – the Wonder Galaxy
Karl D. Gordon, STScI, 29 Jan 2009, IYA09
![Page 2: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/2.jpg)
Why M101
M101 = Pinwheel Galaxy
Large, bright, and face-on
Apparent size is >0.5 degrees
2x larger than the Milky Way
Not inclined
Lots of star formation
Very weak bulge
Large metallicity gradient
Strong change in metals (> He) with radius
![Page 3: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/3.jpg)
Optical
StarsYoung (blue)Old (red)
GasEmission lines(not shown)
Dust (obscuration)
![Page 4: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/4.jpg)
Infrared
StarsOld (blue)
DustAromatics(Organics)(green)
Hot DustStar formation(red)
![Page 5: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/5.jpg)
X-ray
Point-sourcesX-ray binaries(black holes/ neutron stars)Supernovae remnants
Extended EmissionStellar clustersHot gas
![Page 6: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/6.jpg)
Other Views of M101
Very popular galaxy
Observed with other NASA space mission
And ground based observatories
A clear view of star formation from:
GALEX – ultraviolet
Radio – 21cm HI line
Spitzer - infrared
![Page 7: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/7.jpg)
Ultraviolet
Hot Young Stars(unobscured)
Dust (obscuration)Dust scattered light
GALEX far-UV (0.15 micron)
![Page 8: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/8.jpg)
Infrared
Hot Young Stars(obscured)
Hot Dust Emission
Spitzer/MIPS (24 micron)
![Page 9: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/9.jpg)
Radio
21cm emission lineAtomic hydrogenFuel for stars
Ground-basedVery Large Array
![Page 10: M101 – the Wonder Galaxy](https://reader035.vdocument.in/reader035/viewer/2022072013/56812c3a550346895d90c108/html5/thumbnails/10.jpg)
Star Formation
Fuel (green)Unobscured (blue)Obscured (red)