astronomy

II Hz 4

II Hz 4 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 II Hz 4 rather than just read about it. In short: II Hz 4 (short for II Herzog 4) is a ring galaxy located in the constellation of Lynx. The redshift of this galaxy is (z) 0.042 and it was first discovered by an astronomer named Emil Herzog in 1963.

Key takeaways

II Hz 4 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect II Hz 4 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of II Hz 4 from memory before moving on to harder problems.

Reference excerpt

II Hz 4 (short for II Herzog 4) is a ring galaxy located in the constellation of Lynx. The redshift of this galaxy is (z) 0.042 and it was first discovered by an astronomer named Emil Herzog in 1963. It was also subsequently designated as II Hz 4 by Halton Arp who described as an unusual object.

Description II Hz 4 is categorized as a classical double ring galaxy, depicted as having an off-center nucleus within its ring structure and a secondary faint ring feature. The nucleus galaxy is connected by two spiral arms that are described to have a faint appearance, with one of them shown as extended to join the ring feature located south. A separate low-surface brightness ring-like feature is seen, with its size exactly similar to the ring. There is an apparent galaxy companion located with the faint northern ring with an extension terminating at the edge of the second ring feature. The rings have an approximate size of 21.6 x 15.7 and 22.8 and 16.9 kiloparsecs when imaged in both K-band and hydrogen-alpha imaging. A tidal tail with a blue appearance is seen connecting to the companion hinting an interaction. A study published in December 1998, found the presence of ring knots in the galaxy. Based on observations, the estimated model ages of the knots are between six and eight million years. Evidence also found, the two nuclei of the galaxy have a recession velocity differences of 50 kilometers per seconds, with the primary ring feature being inclined at 42° and has a rotation velocity of 28 kilometers per seconds.

References

External links II Hz 4 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with II Hz 4

Start with the simplest possible case. Write down what II Hz 4 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 II Hz 4 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 II Hz 4 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 II Hz 4

In research: II Hz 4 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 II Hz 4 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: II Hz 4 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1963, Lynx (constellation), Principal Galaxies Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for II Hz 4 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 II Hz 4 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what II Hz 4 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 II Hz 4 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is II Hz 4 in simple terms?

II Hz 4 (short for II Herzog 4) is a ring galaxy located in the constellation of Lynx. The redshift of this galaxy is (z) 0.042 and it was first discovered by an astronomer named Emil Herzog in 1963.

Why does II Hz 4 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 II Hz 4?

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 II Hz 4.