astronomy

PKS 2225−308

PKS 2225−308 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 PKS 2225−308 rather than just read about it. In short: PKS 2225−308 is a radio galaxy located in the constellation of Piscis Austrinus. The redshift of the galaxy is (z) 0.058 and it was first discovered as an N galaxy from a survey by S.A.

Key takeaways

PKS 2225−308 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PKS 2225−308 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 2225−308 from memory before moving on to harder problems.

Reference excerpt

PKS 2225−308 is a radio galaxy located in the constellation of Piscis Austrinus. The redshift of the galaxy is (z) 0.058 and it was first discovered as an N galaxy from a survey by S.A. Grandi in August 1983. The galaxy is known to host a radio source and also a member of the galaxy cluster Abell 3880, residing as the brightest cluster galaxy (BCG).

Description PKS 2225−308 is classified as a Fanaroff-Riley Class Type 1 gamma-ray emitting radio galaxy with the total gamma-ray luminosity estimated to be 43.09 Lγ. The central supermassive black hole is estimated to be 9.40 M☉. The host is classified to be a massive elliptical galaxy with the brightness profile best described by a de Vaucouleurs law model. The radio source of the galaxy is described as compact and is found to have a head-tail morphology. The radio structure of the source is classified as a double with components that are shown as slightly extended. There is also a radio core detected at parsec-scales, with the total flux density being estimated as 30 mJy based on radio observations made by Very Large Array (VLA) at 4.9 GHz frequencies. At 10 GHz, the core flux density is estimated to be 21.1 ± 9.3 mJy. The total radio luminosity has been estimated as -0.08 × 1024 W Hz−1. A study has also found presence of X-ray cavities with the cavity power being estimated as 73.4 ± 4.1 × 1042 erg s−1. C-band and X-band imaging also found there is an extended structure shown on one side.

References

External links PKS 2225−308 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 PKS 2225−308

Start with the simplest possible case. Write down what PKS 2225−308 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 PKS 2225−308 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 PKS 2225−308 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 PKS 2225−308

In research: PKS 2225−308 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 PKS 2225−308 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: PKS 2225−308 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1983, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 2225−308 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 PKS 2225−308 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 2225−308 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 PKS 2225−308 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 2225−308 in simple terms?

PKS 2225−308 is a radio galaxy located in the constellation of Piscis Austrinus. The redshift of the galaxy is (z) 0.058 and it was first discovered as an N galaxy from a survey by S.A.

Why does PKS 2225−308 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 PKS 2225−308?

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 PKS 2225−308.