astronomy

PKS 1741−03

PKS 1741−03 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 1741−03 rather than just read about it. In short: PKS 1741−03 is a blazar located in the constellation of Ophiuchus. This core-dominated quasar is located at a redshift of (z) 1.054, found to be highly polarized.

Key takeaways

PKS 1741−03 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 1741−03 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 1741−03 from memory before moving on to harder problems.

Reference excerpt

PKS 1741−03 is a blazar located in the constellation of Ophiuchus. This core-dominated quasar is located at a redshift of (z) 1.054, found to be highly polarized. It was first discovered in 1970 as an extragalactic radio source by astronomers and has a radio spectrum appearing to be flat, making it a flat-spectrum radio quasar.

Description PKS 1741−03 is found to undergo a period of extreme scattering events (ESE). This is a dramatic change represented in flux density of radio sources, usually showing a decreasing trend in flux with a duration period of at least several weeks to months. During its ESE period, there was an increase in its angular diameter by 0.7 milliarcsecond. When observed on timescales of few months, PKS 1741−03 exhibited extreme variations at 2.7 GHz but no traces of violent outbursts in its light curve. Variability was also detected in the blazar at 1.49 GHz likely caused by refractive interstellar scintillation. Radio imaging made by Very Long baseline Interferometry shows PKS 1741−03 to be a simple but compact source, consisting of two components dominated by a central radio core. There is presence of much weaker emission located south of the core which becomes noticed at high frequencies. Imaging made by Very Long Baseline Array shows PKS 1741−03 has a weak component at both epochs. Other VLBI observations at 2 and 8 GHz shows a bright component and a diffused jet structure. Seven components have been discovered inside the parsec-scale jet of PKS 1741−03. Based on interferometric imaging, the jet components display superluminal motion of various speeds with ranges of between 3.5 and 6.1c. Further evidence also shows they are moving ballistically with the exception of one component displaying signs of bent trajectory. In 2022, PKS 1741−03 was found to be a candidate source of a neutrino event. IceCube Observatory located at the South Pole detected a high-energy neutrino event, designated as 220205B above 200 TeV and found it to be associated with the blazar. This observation occurred while PKS 1741−03 was undergoing a powerful flare.

References

External links PKS 1741−03 on SIMBAD PKS 1741−03 on NASA/IPAC Database

Illustrations

Worked examples

Example 1 — a first encounter with PKS 1741−03

Start with the simplest possible case. Write down what PKS 1741−03 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 1741−03 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 1741−03 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 1741−03

In research: PKS 1741−03 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 1741−03 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 1741−03 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1970, Blazars, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 1741−03 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 1741−03 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 1741−03 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 1741−03 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 1741−03 in simple terms?

PKS 1741−03 is a blazar located in the constellation of Ophiuchus. This core-dominated quasar is located at a redshift of (z) 1.054, found to be highly polarized.

Why does PKS 1741−03 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 1741−03?

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 1741−03.