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Harry Kroto 2004
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Let’s weigh Orion Harry Kroto 2004
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Orion GMC Harry Kroto 2004
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Orion GMC n(CO) = 10-1 Harry Kroto 2004
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Orion GMC n(CO) = 10-1 n(H2)/n(CO) = 104 Harry Kroto 2004
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Orion GMC n(CO) = 10-1 n(H2)/n(CO) = 104 n(H2) = 103 cm-3
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2o 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o 2o 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 2o 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o = x 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o = x = 26.2 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o = x = 26.2 1o ~ 25 ly 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 50 ly 2o 1o 200 ly 1500 x sin 1o = x = 26.2 1o ~ 25 ly 8o Harry Kroto 2004
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NB 3.15 x107 secs in a year ~ 3x107 s Harry Kroto 2004
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NB 3.15 x107 secs in a year ~ 3x107 s 1ly ~ 3x107 x 3 x 1010 ~ 1018 cm
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NB 3.15 x107 secs in a year ~ 3x107 s 1ly ~ 3x107 x 3 x 1010 ~ 1018 cm
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[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Harry Kroto 2004
![[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Harry Kroto 2004](http://slideplayer.com/slide/16912451/97/images/32/%5B50+x+50+x+200%5D+x+%5B1018%5D3+x+%5B2+x+103%5D+%5B2x1033%5D+%5B6x1023%5D+Harry+Kroto+2004.jpg "[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Harry Kroto 2004")
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[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly Harry Kroto 2004
![[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly Harry Kroto 2004](http://slideplayer.com/slide/16912451/97/images/33/%5B50+x+50+x+200%5D+x+%5B1018%5D3+x+%5B2+x+103%5D+%5B2x1033%5D+%5B6x1023%5D+Cloud+size+in+ly+Harry+Kroto+2004.jpg "[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly Harry Kroto 2004")
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[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly Convert to cm3 Harry Kroto 2004
![[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly.](http://slideplayer.com/slide/16912451/97/images/34/%5B50+x+50+x+200%5D+x+%5B1018%5D3+x+%5B2+x+103%5D+%5B2x1033%5D+%5B6x1023%5D+Cloud+size+in+ly..jpg "Convert to cm3. Harry Kroto")
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Mass of H2 per cm3 in atomic mass units
[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly Convert to cm3 Mass of H2 per cm3 in atomic mass units Harry Kroto 2004
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Mass of H2 per cm3 in atomic mass units Mo mass of Sun in grams
[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly Convert to cm3 Mass of H2 per cm3 in atomic mass units Mo mass of Sun in grams Harry Kroto 2004
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Mass of H2 per cm3 in atomic mass units Mo mass of Sun in grams
[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] Cloud size in ly Convert to cm3 Mass of H2 per cm3 in atomic mass units Mo mass of Sun in grams Avogadro number Harry Kroto 2004
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[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] 5x105 x 1054 x 2 x 103 12 x 1056 Harry Kroto 2004
![[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] 5x105 x 1054 x 2 x 103.](http://slideplayer.com/slide/16912451/97/images/38/%5B50+x+50+x+200%5D+x+%5B1018%5D3+x+%5B2+x+103%5D+%5B2x1033%5D+%5B6x1023%5D+5x105+x+1054+x+2+x+103..jpg "12 x Harry Kroto")
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[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] 5x105 x 1054 x 2 x 103 12 x 1056 10 62 1056 Harry Kroto 2004
![[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] 5x105 x 1054 x 2 x x](http://slideplayer.com/slide/16912451/97/images/39/%5B50+x+50+x+200%5D+x+%5B1018%5D3+x+%5B2+x+103%5D+%5B2x1033%5D+%5B6x1023%5D+5x105+x+1054+x+2+x+x.jpg "1056. Harry Kroto")
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[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] 5x105 x 1054 x 2 x 103 12 x 1056 10 62 1056 = 106 Mo Harry Kroto 2004
![[50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] 5x105 x 1054 x 2 x x](http://slideplayer.com/slide/16912451/97/images/40/%5B50+x+50+x+200%5D+x+%5B1018%5D3+x+%5B2+x+103%5D+%5B2x1033%5D+%5B6x1023%5D+5x105+x+1054+x+2+x+x.jpg "1056. = 106 Mo. Harry Kroto")
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Main Results Harry Kroto 2004
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Main Results ca Mo GMCs in Milky Way Harry Kroto 2004
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Main Results ca 5000 106Mo GMCs in Milky Way n(H2) = 1 - 104
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Main Results ca 5000 106Mo GMCs in Milky Way n(H2) = 1 - 104
n(CO)/n(H2) = Harry Kroto 2004
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n(13CO)/n(12CO) = 10-2 often optically thick
Main Results ca Mo GMCs in Milky Way n(H2) = n(CO)/n(H2) = n(13CO)/n(12CO) = often optically thick Harry Kroto 2004
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n(13CO)/n(12CO) = 10-2 often optically thick T = 10 - 100K
Main Results ca Mo GMCs in Milky Way n(H2) = n(CO)/n(H2) = n(13CO)/n(12CO) = often optically thick T = K Harry Kroto 2004
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Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here
12CO is optically thick n(13CO) = correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004
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Harry Kroto 2004
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Weighing an Interstellar Cloud Dimensions 2ox2ox8o n(H2) ~ 103 cm-3
Orion 1500ly away 50 ly 2o 1o 1500 x sin 1o = x = 26.2 ~ 25 ly NB x107 secs in a year ~ 3x107 s 1ly ~ 3x107 x 3x 1010 ~ 1018 cm [50 x 50 x 200] x [1018]3 x [2 x 103] [2x1033] [6x1023] 5x105 x 1054 x 2 x 12 x = 106 Mo 200 ly 8o Harry Kroto 2004
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Weighing an Interstellar Cloud
Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o 8o Harry Kroto 2004
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