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The distribution of the angular momenta of galaxies

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Abstract

Since the average relation between the angular momentaP and the massesM of galaxies can be represented by a power lawPM α, we can define a relative angular momentum ϱ=P/M α (or a constant timeP/M α). For a random motion picture within protogalaxies, ϱ should follow a Maxwellian distribution and consequently the dispersion σ of log ϱ should be 0.210.

For the reasonable range of α (\(\tfrac{7}{4}\) to 2), the limited sample of galaxies with known dynamical parameters gives σ between\(\tfrac{1}{2}\) and 1 times the Maxwellian value. For the plausible special case α=2 the reciprocal of the maximum rotational velocityv m is already a measure of ϱ and the larger sample ofv m-values not only yields the Maxwellian σ but, moreover, shows the shape of the distribution.

Резюме

Исходя из среднего отношенияP∼M α между угеловым моловыим моменом и массой галактик, можно определить отлосительньий углоуой момент ϱ=constP/M α. Попредставлению беспорядоаних виЗений внутри протофалактик, ϱ должно бы придерживаться распредления Максвелла и поэтому стандартное отклонение с(lg ϱ)=0.210.

Для принятого во внимание интервла 7/4≦α≦2, немногие галактики с известными динаминескими парамртрами оказывоют σ между половиной и целым значения М аксвелла. Для возможного специалыного случая α=2 обратная величина максимальной скорости вращения уже характеристика для ϱ а больщий материалv m-данных дает не только с Максвелла но и форму распедения.

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Brosche, P. The distribution of the angular momenta of galaxies. Astrophys Space Sci 51, 401–408 (1977). https://doi.org/10.1007/BF00644162

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  • DOI: https://doi.org/10.1007/BF00644162

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