astronomy

PKS 2250−41

PKS 2250−41 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 2250−41 rather than just read about it. In short: PKS 2250−41 is an intermediate redshifted radio galaxy located in the southern constellation of Grus. The redshift of the object is (z) 0.309 and it was first discovered as a strong radio source in 1992 by astronomers via a 6 centimeter Australia Telescope.

Key takeaways

PKS 2250−41 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 2250−41 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 2250−41 from memory before moving on to harder problems.

Reference excerpt

PKS 2250−41 is an intermediate redshifted radio galaxy located in the southern constellation of Grus. The redshift of the object is (z) 0.309 and it was first discovered as a strong radio source in 1992 by astronomers via a 6 centimeter Australia Telescope.

Description PKS 2250−41 is classified as a Fanaroff-Riley Class Type 2 radio galaxy. Its host is an elliptical galaxy belonging to a small galaxy group. A faint companion disc galaxy is found northeast from the host galaxy with a magnitude of 20.57 ± 0.12 and has the same redshift. Evidence pointed out the disc galaxy is also interacting, based on a faint radio bridge and its disturbed appearance towards the direction of the host galaxy. A much smaller galaxy is located southwest and it is also heavily involved in the interaction, given the presence of a western arc-like tail extension. The host galaxy also displays an extended arc structure found measuring an approximate length of 50 kiloparsecs and located west from the continuum nucleus. There is evidence of fainter emission line arcs in the direction of east. An X-shaped structure is found forming from these emission lines at the center of the nucleus. Studies showed PKS 2250−41 has an extended emission-line region (EELR). Based on studies, the structure of the region is described as elliptical with the ellipse's major axis being aligned along the position angle of 80°. The region is also showed to be slightly offset in between its emission line and continuum peaks, with the lines mainly peaking at 0.55 ± 0.03 arcseconds east. An observation made in 1999, resolved the emission lines into two kinetic components, mainly a narrow component and a broad component. The narrow component has a higher ionization level but has weak helium emission. Meanwhile, the broad component has a lower ionization level. The radio structure of the source is mainly made up of two asymmetrical radio lobes on opposite sides, only slightly resolved at 5 GHz frequencies. At 8 GHz, the two radio lobes are still slightly resolved but an extended structure of low-surface brightness, is now seen. No evidence of a radio core is found. Both the lobes are positioned 4.9 and 11.9 arcseconds from the nucleus shown on V-bands. Evidence has confirmed the emission-line arc is wrapping around the western lobe on its outer rim area.

References

External links PKS 2250−41 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 2250−41

Start with the simplest possible case. Write down what PKS 2250−41 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 2250−41 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 2250−41 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 2250−41

In research: PKS 2250−41 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 2250−41 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 2250−41 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1992, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 2250−41 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 2250−41 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 2250−41 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 2250−41 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 2250−41 in simple terms?

Why does PKS 2250−41 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 2250−41?

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 2250−41.