astronomy

PKS 0043−42

PKS 0043−42 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 0043−42 rather than just read about it. In short: PKS 0043−42 is a low-excitation radio galaxy located in the constellation of Phoenix. The redshift of the object is (z) 0.119 and it was first recorded as an extragalactic radio source in December 1965 in the Parkes Catalogue survey by astronomers.

Key takeaways

PKS 0043−42 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 0043−42 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 0043−42 from memory before moving on to harder problems.

Reference excerpt

PKS 0043−42 is a low-excitation radio galaxy located in the constellation of Phoenix. The redshift of the object is (z) 0.119 and it was first recorded as an extragalactic radio source in December 1965 in the Parkes Catalogue survey by astronomers.

Description PKS 0043−42 is classified as a weak-line radio galaxy (WLRG), located at the center of a galaxy group. The host galaxy of the object is best described as an early-type galaxy or an elliptical galaxy based on its stellar continuum. Evidence also points to the host galaxy interacting with a companion object to the north. A diffused halo structure is surrounding the entire host galaxy. K-band imaging showed PKS 0043−42 has evidence of isothope twisting and excessive radio emission in a north-south direction. It is suggested a dust lane might be present in the galaxy or be the result of the interaction with the companion. Surprisingly, although the galaxy displays an undisturbed appearance, a radio bridge is found connecting it to its companion. A radio image has found the source of PKS 0043−42 is mainly extended with a Fanaroff-Riley class Type 2 morphology. While the hotspots are clearly seen even in X-ray imaging, the radio core remains undetected, even at six centimeter frequencies. Evidence of radio emission can be found bridging from the hotspots to the mid-point section of the source. In optical wavelengths, the emission lines displayed in its spectrum contain traces of low ionization. The linear polarization of the source is covered entirely over a large area. A compact dusty torus was discovered in PKS 0043−42 in 2011, indicating cold gas is fueling the accretion process rather than warm gas. The active galactic nucleus luminosity is estimated to be around 3.7 × 1044 erg s−1.

References

External links

PKS 0043−42 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 0043−42

Start with the simplest possible case. Write down what PKS 0043−42 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 0043−42 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 0043−42 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 0043−42

In research: PKS 0043−42 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 0043−42 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 0043−42 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1965, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 0043−42 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 0043−42 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 0043−42 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 0043−42 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 0043−42 in simple terms?

Why does PKS 0043−42 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 0043−42?

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 0043−42.