astronomy

Markarian 876

Markarian 876 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 Markarian 876 rather than just read about it. In short: Markarian 876 (Mrk 876) known as PG 1613+658, is an elliptical galaxy located in the constellation of Draco. With a velocity relative to the cosmic microwave background of 36,302 ± 60 kilometers per seconds, the galaxy is located 1.75 billion light years from Earth.

Key takeaways

Markarian 876 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Markarian 876 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Markarian 876 from memory before moving on to harder problems.

Reference excerpt

Markarian 876 (Mrk 876) known as PG 1613+658, is an elliptical galaxy located in the constellation of Draco. With a velocity relative to the cosmic microwave background of 36,302 ± 60 kilometers per seconds, the galaxy is located 1.75 billion light years from Earth. It is a Seyfert galaxy.

Characteristics Markarian 876 is classified as a large galaxy with a distorted morphology. It has tidal tails extending out from the galaxy by more than 50 arcsecs or 85 kiloparsecs (kpc). The structure of the galaxy appears lopsided and complicated with a secondary nucleus or knot of light located 1.6 arcsec west of the main nucleus. A barred spiral galaxy companion is found lying at the same redshift, indicating the peculiar structure in Markarian 876 might be directly caused by a strong gravitational interaction with the object. However the companion galaxy is located 23 arcsecs north and doesn't seem to tidally connect with Markarian 876, therefore the latter's distorted morphology is likely caused by a galaxy merger. The mass of the black hole in the center of Markarian 876 is estimated to be (2.2 ± 1.0) × 108 M☉ based on an optical reverberation campaign. An emission line is found connected with the source of the galaxy with a rest-frame energy of 4.80+0.05-0.04 keV.

References

External links Markarian 876 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images Mrk 876 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with Markarian 876

Start with the simplest possible case. Write down what Markarian 876 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 Markarian 876 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 Markarian 876 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 Markarian 876

In research: Markarian 876 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 Markarian 876 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: Markarian 876 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Draco (constellation), Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for Markarian 876 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 Markarian 876 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Markarian 876 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 Markarian 876 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Markarian 876 in simple terms?

Why does Markarian 876 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 Markarian 876?

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 Markarian 876.