astronomy

PKS 1151−348

PKS 1151−348 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 1151−348 rather than just read about it. In short: PKS 1151−348 is a quasar and a radio galaxy located in the constellation of Hydra. The redshift of the object is (z) 0.258 and it was first discovered by astronomers conducting the Parkes Catalogue survey in September 1964.

Key takeaways

PKS 1151−348 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 1151−348 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 1151−348 from memory before moving on to harder problems.

Reference excerpt

PKS 1151−348 is a quasar and a radio galaxy located in the constellation of Hydra. The redshift of the object is (z) 0.258 and it was first discovered by astronomers conducting the Parkes Catalogue survey in September 1964. It is also classified as a compact steep spectrum (CSS) quasar since the radio spectrum is mainly both compact and steep.

Description PKS 1151−348 is suggested to have a disturbed morphology based on evidence of an extended structure towards the direction of northwest. When imaged, it has either has presence of a tidal tail or an arc feature found connecting north with the secondary nucleus by 27 kiloparsecs from the host. A broad fan of radio emission is described elongating east from the nucleus with an extent of 38 kiloparsecs. This disturbed morphology indicates the host galaxy is currently interacting with a barred spiral galaxy companion in the early stages, with their nuclei yet to merge together. The optical spectrum of the galaxy mainly displays characteristics that are similar to broad-line radio galaxies. Based on results, the Balmer series lines are classified to be rich, strong with narrow-line features that contain high ionization. Radio imaging made by Very Long Baseline Interferometry (VLBI), found the source has two radio lobe structures that are measuring 0.2 kiloparsecs in extent with a much steeper spectrum measured for the south-western component compared to the north-western component. Both components also display 70% of the total flux density of the source. There is no evidence of a flat-spectrum component. A radio core is found, indicated to have variability with a measured modulation index of 1.9% at 843 MHz frequencies.

References

External links PKS 1151−348 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images PKS 1151-348 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with PKS 1151−348

Start with the simplest possible case. Write down what PKS 1151−348 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 1151−348 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 1151−348 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 1151−348

In research: PKS 1151−348 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 1151−348 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 1151−348 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1964, Hydra (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for PKS 1151−348 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 1151−348 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 1151−348 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 1151−348 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 1151−348 in simple terms?

Why does PKS 1151−348 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 1151−348?

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 1151−348.