Harry Kroto 2004.

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Presentation transcript:

Harry Kroto 2004

Let’s weigh Orion Harry Kroto 2004

Orion GMC Harry Kroto 2004

Orion GMC n(CO) = 10-1 Harry Kroto 2004

Orion GMC n(CO) = 10-1 n(H2)/n(CO) = 104 Harry Kroto 2004

Orion GMC n(CO) = 10-1 n(H2)/n(CO) = 104 n(H2) = 103 cm-3 Harry Kroto 2004

Harry Kroto 2004

Harry Kroto 2004

Harry Kroto 2004

Harry Kroto 2004

Harry Kroto 2004

2o 8o Harry Kroto 2004

Weighing an Interstellar Cloud Harry Kroto 2004

Weighing an Interstellar Cloud Dimensions 2o x 2o x 8o 2o 8o Harry Kroto 2004

Weighing an Interstellar Cloud Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 2o 8o Harry Kroto 2004

Weighing an Interstellar Cloud Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 8o Harry Kroto 2004

Weighing an Interstellar Cloud Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 8o Harry Kroto 2004

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

Weighing an Interstellar Cloud Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o = 1500 x 0.0175 8o Harry Kroto 2004

Weighing an Interstellar Cloud Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o = 1500 x 0.0175 = 26.2 8o Harry Kroto 2004

Weighing an Interstellar Cloud Dimensions 2o x 2o x 8o n(H2) ~ 103 cm-3 Orion 1500ly away 2o 1o 1500 x sin 1o = 1500 x 0.0175 = 26.2 1o ~ 25 ly 8o Harry Kroto 2004

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 = 1500 x 0.0175 = 26.2 1o ~ 25 ly 8o Harry Kroto 2004

NB 3.15 x107 secs in a year ~ 3x107 s Harry Kroto 2004

NB 3.15 x107 secs in a year ~ 3x107 s 1ly ~ 3x107 x 3 x 1010 ~ 1018 cm Harry Kroto 2004

NB 3.15 x107 secs in a year ~ 3x107 s 1ly ~ 3x107 x 3 x 1010 ~ 1018 cm Harry Kroto 2004

[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] 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 Convert to cm3 Harry Kroto 2004

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

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

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

[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 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 103 12 x 1056 10 62 1056 = 106 Mo Harry Kroto 2004

Main Results Harry Kroto 2004

Main Results ca 5000 106Mo GMCs in Milky Way Harry Kroto 2004

Main Results ca 5000 106Mo GMCs in Milky Way n(H2) = 1 - 104 Harry Kroto 2004

Main Results ca 5000 106Mo GMCs in Milky Way n(H2) = 1 - 104 n(CO)/n(H2) = 10-4 Harry Kroto 2004

n(13CO)/n(12CO) = 10-2 often optically thick Main Results ca 5000 106Mo GMCs in Milky Way n(H2) = 1 - 104 n(CO)/n(H2) = 10-4 n(13CO)/n(12CO) = 10-2 often optically thick Harry Kroto 2004

n(13CO)/n(12CO) = 10-2 often optically thick T = 10 - 100K Main Results ca 5000 106Mo GMCs in Milky Way n(H2) = 1 - 104 n(CO)/n(H2) = 10-4 n(13CO)/n(12CO) = 10-2 often optically thick T = 10 - 100K Harry Kroto 2004

Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Orion GMC n(12CO) = 10-3 n(13CO) = 10-3 !!!!!! Something wrong here 12CO is optically thick n(13CO) = 10-3 correct n(12CO) = 10-1 n(H2)/n(12CO) = 104 n(H2) = 103 Harry Kroto 2004

Harry Kroto 2004

Harry Kroto 2004

Harry Kroto 2004

Weighing an Interstellar Cloud Dimensions 2ox2ox8o n(H2) ~ 103 cm-3 Orion 1500ly away 50 ly 2o 1o 1500 x sin 1o = 1500 x 0.0175 = 26.2 ~ 25 ly NB 3.15 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 103 10 62 12 x 1056 1056 = 106 Mo 200 ly 8o Harry Kroto 2004

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