astronomy

MS 0839.8+2938 BCG

MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG rather than just read about it. In short: MS 0839.8+2938 BCG (short for MS 0839.8+2938 Brightest Cluster Galaxy), is a Type-cD galaxy located in the constellation of Cancer. The redshift of the galaxy is (z) 0.193 and it was first discovered by astronomers in September 1989.

Key takeaways

MS 0839.8+2938 BCG belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MS 0839.8+2938 BCG to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MS 0839.8+2938 BCG from memory before moving on to harder problems.

Reference excerpt

MS 0839.8+2938 BCG (short for MS 0839.8+2938 Brightest Cluster Galaxy), is a Type-cD galaxy located in the constellation of Cancer. The redshift of the galaxy is (z) 0.193 and it was first discovered by astronomers in September 1989. It is the dominant and also the brightest cluster galaxy (BCG) of the galaxy cluster MS 0839.8+2938, known as 1E 0839.9+2938.

Description MS 0839.8+2938 BCG is categorized as a giant elliptical galaxy with an E2 Hubble classification. The color of the galaxy is blue, with the optical spectrum mainly displaying signatures of strong emission lines. There is a faint secondary nucleus located in the northeast with a position angle of 75°. The far-infrared star formation rate is estimated to be 4.1 ± 0.5 M☉, with a continuous star formation rate of around 1.05 M☉ and a total stellar mass of around 40.7 × 106 M☉. The appearance of the BCG has been described as having disky isophotes. The K-band magnitude is estimated to be 13.42. The nucleus of the BCG is active and contains a strong radio source, making it a radio galaxy. The source has a radio luminosity of 1.1 × 1024 W Hz−1 and has a compact appearance, mainly dominated by a radio core with radio lobes extending for 80 kiloparsecs. The measured radio flux density is estimated to be 26 ± 1 and 25 ± 1 mJy based on C and B configuration array imaging made by the Very Large Array (VLA). Radio imaging made with the Low Frequency Array (LOFAR) shows a central radio component with small lobes. There is no clear evidence of any X-ray cavities associated with the lobes. A study also found the BCG displays extended hydrogen alpha emission and also doubly ionized oxygen emission mainly centering on it, indicating signs of cooling flows.

References

External links MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG

Start with the simplest possible case. Write down what MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG

In research: MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG 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: MS 0839.8+2938 BCG is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1989, Cancer (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MS 0839.8+2938 BCG in simple terms?

Why does MS 0839.8+2938 BCG 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 MS 0839.8+2938 BCG?

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 MS 0839.8+2938 BCG.