astronomy

PKS J0116−4722

PKS J0116−4722 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 J0116−4722 rather than just read about it. In short: PKS J0116−4722 also known as J0116−473 in literature, is a radio galaxy located in the constellation of Phoenix. Its redshift is (z) 0.147800 and it was first discovered as a radio source by astronomers who were conducting the Parkes Catalogue of Radio Sources survey in 1964, designated as PKS 0114−47.

Key takeaways

PKS J0116−4722 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 J0116−4722 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS J0116−4722 from memory before moving on to harder problems.

Reference excerpt

PKS J0116−4722 also known as J0116−473 in literature, is a radio galaxy located in the constellation of Phoenix. Its redshift is (z) 0.147800 and it was first discovered as a radio source by astronomers who were conducting the Parkes Catalogue of Radio Sources survey in 1964, designated as PKS 0114−47.

Description PKS J0116−4722 is classified as a giant Fanaroff-Riley Type II radio galaxy with a total radio luminosity of 2.2 × 1026 W Hz−1 and a linear size of 2.1 megaparsecs. It is located in a sparse galaxy environment with three galaxies encircling it. PKS J0116−4722 has a variable radio core described as a point-like source, with an X-ray spectrum best fitted with a double power law of 0.3-0.8 kiloelectron volts (KeV). A wiggled jet is seen emerging from the core, curving through a large angle and terminating at an emission-plateau. There is a peculiar feature shown as linear and intersecting the source between the jet's bright knot and the core. Earlier observations described it, a giant complex source. Two massive radio lobes are found in PKS J0116-2722. They are described as edge-brightened and showing polarization on their outer boundaries. However, both ends of the lobes showed absence of compact hotspots; instead having warm spots in their place. Radio imaging observations by Australia Telescope Compact Array (ATCA), showed the galaxy has an inner set of radio lobes located north and south, with radio luminosities of 2 × 1025 W Hz−1. However the inner northern lobe is short and diffused, while the inner southern lobe is described as elongated, displaying radio emission peaks. These inner lobes in the galaxy are implied to be formed from renewed nuclear core activity, happening around (3-5) × 106 years ago. A bar-like feature has been discovered by ATCA in the southern radio lobe of PKS J0116-2722. When observed, it has a sharp bound along the galaxy's northern edge, appearing as a separate component. This bar-like feature has high degree of fractional polarization and a steep radio spectra index in its emission. Should this feature be described as a wing feature, PKS J0116-2722 can be reclassified as an X-shaped radio galaxy.

References

External links PKS J0116−4722 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images PKS J0116−4722 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with PKS J0116−4722

Start with the simplest possible case. Write down what PKS J0116−4722 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 J0116−4722 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 J0116−4722 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 J0116−4722

In research: PKS J0116−4722 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 J0116−4722 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 J0116−4722 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1964, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for PKS J0116−4722 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 J0116−4722 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS J0116−4722 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 J0116−4722 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS J0116−4722 in simple terms?

Why does PKS J0116−4722 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 J0116−4722?

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 J0116−4722.