The total mass of neutral gas in the Galaxy is ≈ 4 × 109 M⊙. Assume that it is uniformly distributed in a disk of radius Rdisk=15 kpc, and thickness H=200 pc, and that it is a mixture of H and He with He/H=0.1 (by number). Assume ionized hydrogen to be negligible in this problem. Remember that 1 M⊙=1.9891 × 1030 kg, 1 pc=3.0857 × 1016 m, and the mass of the hydrogen atom is 1.6735 × 10−27 kg. a) What is the average number density of hydrogen nuclei within the disk (in SI units and in particles cm−3 )?
The total mass of neutral gas in the Galaxy is ≈ 4 × 109 M⊙. Assume that it is uniformly distributed in a disk of radius Rdisk=15 kpc, and thickness H=200 pc, and that it is a mixture of H and He with He/H=0.1 (by number). Assume ionized hydrogen to be negligible in this problem. Remember that 1 M⊙=1.9891 × 1030 kg, 1 pc=3.0857 × 1016 m, and the mass of the hydrogen atom is 1.6735 × 10−27 kg. a) What is the average number density of hydrogen nuclei within the disk (in SI units and in particles cm−3 )?
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The total mass of neutral gas in the Galaxy is ≈ 4 × 109 M⊙. Assume that it is uniformly distributed in a disk of radius Rdisk=15 kpc, and thickness H=200 pc, and that it is a mixture of H and He with He/H=0.1 (by number). Assume ionized hydrogen to be negligible in this problem. Remember that 1 M⊙=1.9891 × 1030 kg, 1 pc=3.0857 × 1016 m, and the mass of the hydrogen atom is 1.6735 × 10−27 kg. a) What is the average number density of hydrogen nuclei within the disk (in SI units and in particles cm−3 )?
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