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Questions tagged [globular-clusters]

Questions about large, dense, massive collections of stars orbiting galaxies, thought to have formed in the early universe.

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1answer
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Dataset for globular star cluster

Where can I find the dataset(s) for a globular star cluster? The datasets should have the coordinates, color index (for different wavelengths) , magnitude etc. of every star in the cluster. I want ...
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1answer
211 views

What would our night sky look like if the solar system was 100 light years from the centre of the Milky Way

When we look at photo's of the centre of the Milky Way, it looks extremely bright due to the concentraion of star systems... If our solar system was only 100 light years from the centre of the Galaxy,...
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2answers
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Dataset containing list of known globular clusters

Does anybody know if there is an existing dataset that consists of all known star clusters, their name, and their apparent dimensions or similar? Is it possible to make a query to, or download all ...
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2answers
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Is our sun in a star cluster?

Sorry for the absolute begginer question here, but is our sun a part of some globular cluster? It is something related to Virgo supercluster?
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1answer
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Help me identify a cluster [closed]

as I was browsing Nasa's Eyes few days ago, I saved a screenshot, but it seems text is blurrry, supher-485, first letter is S ends with er-485 from as I can read it kinda looked like Cosmic Web, ...
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0answers
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Jacobi vs tidal radius for star cluster

The tidal radius is defined in King (1962) as: the value of r (the radius) at which f (the density profile) reaches zero... This also referred by King as the "limiting radius" written as (Eq 3): $...
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1answer
105 views

Globular Cluster diameter

I am doing a homework on globular clusters and could not find trustworthy data on the average diameter of a globular cluster. Most clusters I included had a diameter of 120-150 ly. But is that the ...
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1answer
124 views

Do the heliospheres of stars at the center of globular clusters interact?

I read that the stars in the center of globular clusters are incredibly close to one another and that these stars can be spaced 100 to 1000 times closer than the stars near the sun. Because these ...
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1answer
99 views

Is it true that open clusters have $E > 0$ and globular clusters have $E < 0$?

I just need to confirm or refute something I'm believing since a very long time, maybe without real evidence. Can we distinguish stellar clusters by their total mechanical energy ? Is it true that ...
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1answer
66 views

Natural units of star clusters angular momentum and energy

I'm calculating the total angular momentum of a bunch of theoretical stars of a few solar masses, separated by a few light years, moving at velocities of about a few dozens of km / sec. Mechanical ...
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1answer
118 views

How far apart are stars in Terzan 5 cluster?

I've just learned about the Terzan 5 globular cluster, which according to Wikipedia has one of the highest star densities in our Galaxy - $10^6\ M_\odot/\mathrm{pc}^3$. Problem is, I've no idea how ...
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1answer
151 views

Why don't globular clusters flatten with a galactic disc?

Globular clusters lie in the galactic halo, outside of the disc. However, galaxies are more or less a collection of material and objects — why is it, then, that most stars form a plane due to the ...
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1answer
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How many stars are there in a Globular Cluster of 10^5 solar masses?

I was wondering whether there is an easy way to approximate the number of stars in a Globular Cluster (GC) with 10^5 solar masses. Can one, for instance just assume the GC is made of sun-like stars ...
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1answer
208 views

Distribution of Stars in Milky Way and globular cluster analogy

Just a quick (and hopefully simple) question on the distribution of stars in the Milky Way and in globular clusters. I was wondering why it IS NOT possible to describe the distributions of stars in ...
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2answers
239 views

Globular cluster star density as a function of distance from the center

Context: I want to simulate globular clusters in a simple way, just to display the positions of stars. Assuming isotropy, what would be a reasonable model of the stellar number density as a function ...
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2answers
441 views

What is the difference between a dwarf spheroidal galaxy and a globular cluster?

This Wikipedia article states that Segue 1 is either a dwarf spheroidal galaxy or globular cluster associated with our own Milky Way. I am wondering what the difference is between dwarf spheroidal ...
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3answers
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Is there a fundamental difference between a small galaxy, and a large star cluster?

For instance, If a large globular cluster were somehow ejected from its galaxy, and was observed by astronomers, would they call it a galaxy, or would there be characteristics of the star cluster that ...
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4answers
2k views

How would the night sky look from inside a globular cluster?

When the weather is clear, we can look at the stars. And we normally would see several thousands of them, they all being more than a $\textrm{pc}$ away from us. Now, there are globular clusters, ...