astronomy

MCG-02-12-039

MCG-02-12-039 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 MCG-02-12-039 rather than just read about it. In short: MCG-02-12-039 also known as A496 cD, is an elliptical galaxy located in the constellation of Eridanus. The redshift of the galaxy is (z) 0.032 and it was first discovered by a group of astronomers in March 1985.

Key takeaways

MCG-02-12-039 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MCG-02-12-039 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MCG-02-12-039 from memory before moving on to harder problems.

Reference excerpt

MCG-02-12-039 also known as A496 cD, is an elliptical galaxy located in the constellation of Eridanus. The redshift of the galaxy is (z) 0.032 and it was first discovered by a group of astronomers in March 1985. It is classified as a Type-cD galaxy and is the brightest cluster galaxy, of the Abell 496 galaxy cluster.

Description MCG-02-12-039 is the dominant galaxy of Abell 496. It is known to contain a large galactic halo that is found surrounding it with many distant galaxy companions in the background. It has also been described as a weak emission line galaxy based on a study published in December 2008. There is also strong presence of extended optical emission by around 10 arcseconds from the central nucleus, mainly made up of hydrogen-alpha and singly ionized nitrogen. The estimated equivalent age of a single stellar population in the galaxy is around 1.05 ± 0.21 billion years. In the center of the galaxy, there are three dust lanes that are found to be uncurling in an anticlockwise direction, in a spiral pattern. Evidence found the halo of the galaxy is found to display a blue profile per each increasing radius based on a B-V color profile. However, when observed in visual infrared colors, the profile is shown to be more redder. There is also a presence of an elongated stellar component with gas components also having the same morphology but to a lesser extent. The central nucleus is found to have its parts blueshifted by around 125 kilometer per seconds. A study published in 2020 has found the presence of gas filaments in the galaxy. When observed, the gas components are described as stretched suggesting there is a common origin. Moreover, a misalignment is shown between stellar and gas kinematics, hinting interstellar gas is found to be externally accreted. The central supermassive black hole of the galaxy is estimated to be around 8.78 M☉.

References

External links MCG-02-12-039 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with MCG-02-12-039

Start with the simplest possible case. Write down what MCG-02-12-039 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 MCG-02-12-039 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 MCG-02-12-039 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 MCG-02-12-039

In research: MCG-02-12-039 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 MCG-02-12-039 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: MCG-02-12-039 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1985, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for MCG-02-12-039 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 MCG-02-12-039 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MCG-02-12-039 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 MCG-02-12-039 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MCG-02-12-039 in simple terms?

Why does MCG-02-12-039 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 MCG-02-12-039?

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 MCG-02-12-039.