astronomy

PKS 1335−127

PKS 1335−127 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 1335−127 rather than just read about it. In short: PKS 1335-127 is a blazar located in the constellation of Virgo with a redshift of (z) 0.539. This is a compact BL Lac object containing a radio source of extragalactic origins; discovered in 1970 during the continuum survey conducted by astronomers from Ohio State University.

Key takeaways

PKS 1335−127 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 1335−127 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PKS 1335−127 from memory before moving on to harder problems.

Reference excerpt

PKS 1335-127 is a blazar located in the constellation of Virgo with a redshift of (z) 0.539. This is a compact BL Lac object containing a radio source of extragalactic origins; discovered in 1970 during the continuum survey conducted by astronomers from Ohio State University. The object shows a radio spectrum appearing as flat, thus making it a flat-spectrum radio quasar (FRSQ), but also classified as a gigahertz-peaked source (GPS) with high polarization.

Description PKS 1335-127 is considered to be variable on the electromagnetic spectrum. It is known to produce a near-infrared flare which was detected in February 2013 showing a H-band flux value of 13.691 ± 0.08. Enhanced gamma-ray activity was observed from the object in May 2020, followed by an optical flare one month later. There is presence of large amplitude variability and evidence of position angles showing different rotations at both low and high frequencies from the object. Radio imaging made by the Very Long Baseline Array on arcsecond scales, shows the structure of PKS 1335-127 is mainly made up of a radio core and a radio jet that is found to curve in an eastwards direction by 6.5" from the core. When imaged at 43 GHz, the jet is revealed to become less defined, with a patch of weak diffused radio emission located southeast. There is also an extended component located at a 152° position angle at a distance of 2.6 milliarcseconds. Earlier observations via a very-long baseline Interferometry (VLBI) map shows the core as unresolved while the jet is found to have an orientation of 135° indicating a perpendicular magnetic field. Further observations also found the circular polarization in PKS 1335-127 is stable. While images at 15 and 22 GHz respectively shows the presence of compact radio emission focused on the phase center, the image at 43 GHz shows PKS 1335-127 has a double structure containing components with a much stronger southern component. There is also circular polarization towards the jet at its southwestern edge, polarized by 7.16 percent; however it is found 2 factor higher when compared to circular polarization in the jet of 3C 84 (NGC 1275).

References

External links PKS 1335-127 on SIMBAD PKS 1335-127 on NASA/IPAC Database

Illustrations

Worked examples

Example 1 — a first encounter with PKS 1335−127

Start with the simplest possible case. Write down what PKS 1335−127 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 1335−127 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 1335−127 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 1335−127

In research: PKS 1335−127 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 1335−127 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 1335−127 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1970, BL Lacertae objects, so understanding it makes those chapters shorter.
In everyday life: Look for PKS 1335−127 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “PKS 1335−127” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study PKS 1335−127 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PKS 1335−127 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 1335−127 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PKS 1335−127 in simple terms?

Why does PKS 1335−127 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 1335−127?

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 1335−127.