Questions tagged [galactic-halo]

Questions about the roughly spherical component that extends beyond the visible part of a galaxy, made of a sparse field of stars and globular clusters, gas and dark matter.

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6
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2answers
519 views

Why people choose 0.2 as the value of linking length in the friends-of-friends algorithm?

Friends-of-friends (hereafter FOF) algorithm is commonly used to find halos in cosmological simulations. And FOF depends on only one parameter, i.e. linking length, $l_\mathrm{link}=b \left(\frac{V_u}{...
3
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2answers
77 views

What is the mean separation between a star and its closest neighbor in the Milky Way halo?

My question is inspired by this previous question, Are there any stars that orbit perpendicular to the Milky Way's galactic plane?. In the great answer posted by @ConnorGarcia, one commenter said he ...
36
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2answers
4k views

Are there any stars that orbit perpendicular to the Milky Way's galactic plane?

Most stars orbit in the Milky Way's galactic disc. But is it possible for one to orbit perpendicular to it? Here on Earth since we're inside the galactic plane we can't get a good view of what the ...
2
votes
0answers
35 views

Plotting Histograms of stellar mass and gas mass given a halo mass

I am an undergrad doing a first course in astronomy. I am working on a small project. In it I have been assigned a halo mass (1.444e12 $M_{sun}$). I want to plot histograms of possible stellar masses ...
3
votes
1answer
125 views

The contribution of components like dark matter, stars and gas to the mass of a galaxy

I am doing an introductory course in astrophysics and astronomy undergrad level. In it we were taught that the main components of matter in a galaxy are dark matter halo ($M_h$), gas ($M_{gas}$) and ...
2
votes
1answer
59 views

How do disk-shaped galaxies then form at the sites of spherical galactic halos? Do the halo stars start orbiting or just sit in place?

Phys.org's Astronomers detect large amounts of oxygen in ancient star's atmosphere mentions "Stars like J0815+4729 are referred to as halo stars," explained UC San Diego astrophysicist Adam ...