astronomy

NGC 6166

NGC 6166 is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand NGC 6166 rather than just read about it. In short: NGC 6166 is a supergiant elliptical galaxy in the Abell 2199 cluster. It lies 490 million light years away in the constellation Hercules.

Key takeaways

NGC 6166 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 6166 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 6166 from memory before moving on to harder problems.

Reference excerpt

NGC 6166 is a supergiant elliptical galaxy in the Abell 2199 cluster. It lies 490 million light years away in the constellation Hercules. The primary galaxy in the cluster, it is one of the most luminous galaxies known in terms of X-ray emissions.

Description NGC 6166 is a supermassive, type cD galaxy, with several smaller galaxies within its envelope. Suspected to have formed through a number of galaxy collisions, NGC 6166 has a large number of globular clusters (estimated as between 6,200 and 22,000 in 1996) orbiting the galaxy. A 2016 study, however, gave an even higher number (around 39,000) suggesting also that the halo of this galaxy blends smoothly with the intra-cluster medium. Because of that, the galaxy has the richest globular cluster system known. The galaxy harbors a supermassive black hole at its center with a mass of 28.4 billion +2.7−1.8 M☉, nearly 30 billion M☉ based on dynamical modelling.

NGC 6166 is known to host an active nucleus, classified as an FR I source, which powers two symmetric parsec-scale radio jets and radio lobes. These are caused by the infall of gas into its center due to a cooling flow that deposits 200 solar masses of gas every year there. It has been proposed that a number of O-type stars may be present in the center of NGC 6166.

Supernovae Two supernovae have been observed in NGC 6166:

SN 2009eu (Type Ia, mag. 19.5) was discovered by Lick Observatory Supernova Search (LOSS) on 21 May 2009. PSN J16283836+3932552 (Type Ia-91bg, mag. 19.5) was discovered by R. Gagliano, D. Post, Jack Newton, and Tim Puckett on 15 May 2015.

Image gallery

Illustrations

Worked examples

Example 1 — a first encounter with NGC 6166

Start with the simplest possible case. Write down what NGC 6166 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to NGC 6166 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about NGC 6166 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of NGC 6166

In research: NGC 6166 appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses NGC 6166 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: NGC 6166 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3C objects, Abell 2199, Active galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 6166 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study NGC 6166 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 6166 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain NGC 6166 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 6166 in simple terms?

NGC 6166 is a supergiant elliptical galaxy in the Abell 2199 cluster. It lies 490 million light years away in the constellation Hercules.

Why does NGC 6166 matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study NGC 6166?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on NGC 6166.