astronomy

PKS 1622−297

PKS 1622−297 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 1622−297 rather than just read about it. In short: PKS 1622−297 is a blazar located in the constellation of Scorpius. It is one of the brightest objects of its type in the gamma ray region.

Key takeaways

PKS 1622−297 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 1622−297 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 1622−297 from memory before moving on to harder problems.

Reference excerpt

PKS 1622−297 is a blazar located in the constellation of Scorpius. It is one of the brightest objects of its type in the gamma ray region. It has a redshift of (z) 0.815. This blazar was first discovered as a compact astronomical radio source in 1970 by astronomers who were conducting interferometer observations and identified with an optical counterpart in 1984. In addition, the radio spectrum of the source appears flat, making it a flat-spectrum radio quasar (FRSQ).

Description PKS 1622−297 produced a powerful gamma ray outburst in June and July 1995. This was detected by Energetic Gamma Ray Experiment Telescope (EGRET) in the year 1995, where its outburst in the energy range above 100 MeV lasted for a period of five weeks. However no presence of MeV emission was detected. A major flare in PKS 1622−297 was observed by EGRET, and lasted around two days. Subsequent optical observations in 1996 and 1997 as well as three nights in 2001, showed the source is much fainter. Two other flares were detected in March 2010 and July 2014. A three-week radio, optical and X-ray campaign was conducted on PKS 1622−297 by the Rossi X-ray Timing Explorer as well as the University of Michigan Radio Astronomy Observatory and optical telescopes at Cerro Tololo Inter-American Observatory in Chile. Results indicated the object was a weak X-ray emitter and was also redder during its bright optical flux state. Radio images made of the object via Very Long Baseline Interferometry observations showed the source having an elongated structure towards the west on parsec scales. Three components are found in a form of a bright core and two weak jet components showing superluminal motion reaching up to 12.1 h−1 c. There is a jet along the position angle of 69°, made up of a prominent component 15 mas from the core with a diffused structure extending out to 30 mas. However a VLBI Space Observatory Programme (VSOP) image shows it having a weak component and a strong core. In an Australia Telescope Compact Array (ATCA) imaging at 4.8 GHz, the source has a bright core with strong extended emission in form of two components. These components are placed in equal angular distances on sides of the core and of similar brightness and sizes. The supermassive black hole in PKS 1622−297 is estimated to be 8 × 108 M☉ with the limit of the Schwarzschild radius being Rg > 2.5 × 1014 centimeters.

References

External links PKS 1622−297 on SIMBAD PKS 1622−297 on NASA/IPAC Database

Illustrations

Worked examples

Example 1 — a first encounter with PKS 1622−297

Start with the simplest possible case. Write down what PKS 1622−297 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 1622−297 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 1622−297 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 1622−297

In research: PKS 1622−297 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 1622−297 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 1622−297 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 1622−297 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 1622−297 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 1622−297 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 1622−297 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 1622−297 in simple terms?

PKS 1622−297 is a blazar located in the constellation of Scorpius. It is one of the brightest objects of its type in the gamma ray region.

Why does PKS 1622−297 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 1622−297?

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 1622−297.