astronomy

PKS 0215+015

PKS 0215+015 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 0215+015 rather than just read about it. In short: PKS 0215+015 is a BL Lacertae object (BL Lac) located in the constellation of Cetus. It has a high redshift of (z) 1.72 and was first discovered in 1971 by J.V.

Key takeaways

PKS 0215+015 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 0215+015 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 0215+015 from memory before moving on to harder problems.

Reference excerpt

PKS 0215+015 is a BL Lacertae object (BL Lac) located in the constellation of Cetus. It has a high redshift of (z) 1.72 and was first discovered in 1971 by J.V. Wall and his colleagues during the Parkes Catalogue of Radio Sources survey. The radio spectrum of the source is flat, making it a flat-spectrum radio quasar, a type of blazar also known as an optically violent variable quasar in literature.

Description PKS 0215+015 is classified as a bona fide BL Lac object, displaying typical characteristics such as weak emission lines and high rapid polarization changes. It is variable on the electromagnetic spectrum with its optical band displaying variations of more than 4 magnitudes. Rapid polarization swings at 50° and -100° were found associated with the rapid flux variations of the object. According to optical continuum observations, PKS 0215+015 is found to undergo a flaring period, brightening up to 1.5 magnitude by September 10, 1980. On October 20, 1984, the object reached its brightest state with a B magnitude of 14.5 while its faintest state was recorded on August 11, 1983. By 1986, its brightness flared up once more after being in a faint state in 1985. Observations by the Australia Telescope Compact Array (ATCA), also showed the source had a strong long-term increase in its flux density since May 2021. The radio structure of PKS 0215+015 is compact. Based on radio observations, the source has an inverted spectrum which peaks over 10 GHz. It has a radio core which has a high brightness temperature. Very Large Array imaging showed there is also a bent jet pointing in a north to south direction near the core region, with a subsequent bend clearly shown pointing east. The jet also has a component visible at 2 centimeter and 7 millimeter wavelength imaging which in turn is blended partially with the core. In February 2022, the IceCube Neutrino Observatory detected a new candidate high-track energy muon neutrino event. Dubbed IceCube-220225A, it was found to be associated with PKS 0215+015 which at that time, was undergoing a powerful radio flare exceeding flux densities of 3 Jy at both centimeter and millimeter wavelengths. Observations also suggested the neutrino production happened closer to the core. Several absorption lines have been identified in the quasar's ultraviolet spectrum, with one of the lines at (z) 1.345 displaying evidence of ionized neutral magnesium, manganese and ionized iron absorption. Another absorption line located at (z) 1.721, shows cerium and chromium oxide absorption.

References

External links PKS 0215+015 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images PKS 0215+015 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with PKS 0215+015

Start with the simplest possible case. Write down what PKS 0215+015 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 0215+015 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 0215+015 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 0215+015

In research: PKS 0215+015 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 0215+015 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 0215+015 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1971, BL Lacertae objects, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 0215+015 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 0215+015 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 0215+015 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 0215+015 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 0215+015 in simple terms?

PKS 0215+015 is a BL Lacertae object (BL Lac) located in the constellation of Cetus. It has a high redshift of (z) 1.72 and was first discovered in 1971 by J.V.

Why does PKS 0215+015 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 0215+015?

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 0215+015.