astronomy

PKS 1148−001

PKS 1148−001 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 1148−001 rather than just read about it. In short: PKS 1148−001, also known as UM 458 and 4C −00.47, is a quasar in the constellation of Virgo. It has a measured redshift of approximately 1.98, placing it at a cosmological distance of roughly 10 billion light-years from Earth, depending on the cosmological parameters used.

Key takeaways

PKS 1148−001 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 1148−001 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 1148−001 from memory before moving on to harder problems.

Reference excerpt

PKS 1148−001, also known as UM 458 and 4C −00.47, is a quasar in the constellation of Virgo. It has a measured redshift of approximately 1.98, placing it at a cosmological distance of roughly 10 billion light-years from Earth, depending on the cosmological parameters used. PKS 1148−001 is classified as a radio-loud quasar and is a variable extragalactic radio source. High-resolution radio observations have revealed compact structure and a one-sided jet associated with the source.

Radio structure Observations using interplanetary scintillation and very-long-baseline interferometry found that the radio source associated with PKS 1148−001 has an apparent angular size of approximately 0.1 arcsecond. Very-long-baseline observations have also detected a one-sided jet on milliarcsecond scales. The asymmetry of the observed jet is consistent with relativistic effects affecting emission from an active galactic nucleus. Radio jets in quasars are produced by material associated with an accreting supermassive black hole and can extend far beyond the central region of the host galaxy.

See also Quasar Radio-loud quasar Blazar Active galactic nucleus Supermassive black hole

References

Illustrations

Worked examples

Example 1 — a first encounter with PKS 1148−001

Start with the simplest possible case. Write down what PKS 1148−001 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 1148−001 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 1148−001 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 1148−001

In research: PKS 1148−001 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 1148−001 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 1148−001 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 4C objects, Active galaxies, Blazars, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 1148−001 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 1148−001 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 1148−001 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 1148−001 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 1148−001 in simple terms?

Why does PKS 1148−001 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 1148−001?

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 1148−001.