astronomy

PKS J1158+2621

PKS J1158+2621 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 J1158+2621 rather than just read about it. In short: PKS J1158+2621 is a low-ionization nuclear emission line region (LINER) galaxy located in the constellation of Leo. The redshift of the galaxy is (z) 0.112 and it was first discovered as an astronomical radio source by E.T.

Key takeaways

PKS J1158+2621 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 J1158+2621 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS J1158+2621 from memory before moving on to harder problems.

Reference excerpt

PKS J1158+2621 is a low-ionization nuclear emission line region (LINER) galaxy located in the constellation of Leo. The redshift of the galaxy is (z) 0.112 and it was first discovered as an astronomical radio source by E.T. Olsen at Owens Valley Radio Observatory in California in August 1967, where it was given the designation as 4C 26.35 or 4C 26.35A. It is classified as a radio galaxy and is one of the brightest known cluster galaxies in Abell 1425 although being nondominant.

Description PKS J1158+2621 is classified as a Fanroff-Riley Type 2 radio galaxy. It has two pairs of radio lobes. The first pair are found on the inner side orientated from northwest to southeast directions while the other pair of lobes are on the outer sides in the same direction like the inner lobes. High resolution imaging also found the inner lobes show the presence of structures described as edge-brightened. The outer lobes display surface brightness at their far ends. Traces of radio emission can also be seen at outer ends of each outer lobe. The spectral ages of the outer lobes are estimated to be 135 and 92 million years old. There are also two warm spot features with an estimated age of 10.7 million years. The radio core of the galaxy is described as weak with an X-ray spectrum. The spectrum is shown to have a flat photon index, with the core itself displaying an absence of a hard power law. There are also detections of molecular gas in the galaxy with the lower limit being 0.37 × 109 M☉ and an upper limit of around 2.09 × 109 M☉. A two sided radio jet is found inside the galaxy with the first half of the jet going in a northwest direction while the other half of the jet is found heading in southeast direction on opposite side. The projected length of the first jet is around 66 kiloparsecs, while the second jet has a length of 56 kiloparsecs. Radio polarization has also been detected inside the northwestern region of the source when observed at 0.6 GHz frequencies.

References

External links PKS J1158+2621 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with PKS J1158+2621

Start with the simplest possible case. Write down what PKS J1158+2621 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 J1158+2621 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 J1158+2621 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 J1158+2621

In research: PKS J1158+2621 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 J1158+2621 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 J1158+2621 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 4C objects, Active galaxies, Astronomical objects discovered in 1967, so understanding it makes those chapters shorter.
In everyday life: Look for PKS J1158+2621 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 J1158+2621 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS J1158+2621 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 J1158+2621 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS J1158+2621 in simple terms?

Why does PKS J1158+2621 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 J1158+2621?

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 J1158+2621.