astronomy

PKS 0048−097

PKS 0048−097 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 0048−097 rather than just read about it. In short: PKS 0048−097 is a BL Lacertae object located in the western region of the Cetus constellation. The redshift of the object is (z) 0.635 based on measurement of emission lines, estimating it to be 6 billion light-years from Earth.

Key takeaways

PKS 0048−097 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 0048−097 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 0048−097 from memory before moving on to harder problems.

Reference excerpt

PKS 0048−097 is a BL Lacertae object located in the western region of the Cetus constellation. The redshift of the object is (z) 0.635 based on measurement of emission lines, estimating it to be 6 billion light-years from Earth. It was first discovered by astronomers during the Parkes Observatory radio sources survey in 1966. The source is known to be variable based on its flux density and is located northeast from NGC 246, a planetary nebula.

Description PKS 0048−097 is optically violently variable. When observed during photometric monitoring on January 18, 2001, the source fluctuated in brightness, increasing by 0.38 magnitudes within 45 minutes then decreasing its brightness before increasing once more. In addition, the object has displayed several flaring periods with a large optical outburst occurring in June 2009. It was noted to be in a moderate high optical state of 15.5 magnitudes with its energy distribution estimated to be from 1014 reaching up to 2.5 × 1015 Hz. Long-term variations were observed via optical wavelengths of almost 3 magnitudes with a flickering period of 8 magnitude less than one week. A near-infrared flaring period was detected in January 2011. The radio structure of PKS 0048−097 is compact. Based on observations, the source displays a radio spectrum with a turnover frequency at 10 GHz but becomes inverted to 22 GHz when its activity becomes minimum. Imaging by Very Long Baseline Interferometry showed there is a jet towards the southeast direction with a position angle of 165°, a polarized jet component and a weakly polarized radio core. Extended radio emission from the core is seen in the center of both a possible hotspot and a diffused structure. Very Large Array observations found an extended secondary component holding a flux density of 0.05 ± 0.01 Jansky. PKS 0048−097 is classified as a polarization rotator. It has polarization variations occurring at the time scale of five years, which in turn, are associated with a component described as slow varying opposed to outbursts on short time scales. The polarization position angle is also noted as stable at 90° ± 1.5° without any signs of major amplitude changes in this eight year observation period. A rotation of 260° was reported, beginning before the outburst in 1974-75 and ending as soon the outburst reached a peak of 8 GHz. Further observations detected its spectrum elevating at all frequencies suggesting the outburst was broadband. The host galaxy of PKS 0048−097 is undetected, but is assumed to be an elliptical galaxy. It has a faint companion located 2.5 arcseconds east from its nucleus appearing as both resolved and associated together with the source based on imaging. A quasi-periodicity modulation was found for PKS 0048−097. Based on light curve data observations, the periodicity is estimated between 350 and 600 days. The structure is also known to vary dramatically with its jet direction shifting in position angle from -160° south-westwards to +160° south-eastwards.

References

External links PKS 0048−097 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images PKS 0048−097 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with PKS 0048−097

Start with the simplest possible case. Write down what PKS 0048−097 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 0048−097 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 0048−097 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 0048−097

In research: PKS 0048−097 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 0048−097 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 0048−097 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1966, BL Lacertae objects, Cetus (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for PKS 0048−097 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 0048−097 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 0048−097 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 0048−097 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 0048−097 in simple terms?

Why does PKS 0048−097 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 0048−097?

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 0048−097.