astronomy

Goldfish galaxy

Goldfish galaxy 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 Goldfish galaxy rather than just read about it. In short: The Goldfish galaxy, also known as 7C 1713+6407a, is a radio galaxy located in the constellation of Draco. The redshift of the galaxy is z=0.080 and it was first discovered by astronomers in 1974 as an astronomical radio source whom they described it having a steep radio spectrum.

Key takeaways

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

Reference excerpt

The Goldfish galaxy, also known as 7C 1713+6407a, is a radio galaxy located in the constellation of Draco. The redshift of the galaxy is z=0.080 and it was first discovered by astronomers in 1974 as an astronomical radio source whom they described it having a steep radio spectrum. It is considered to be a member of the rich galaxy cluster Abell 2255, alongside the Beaver galaxy, the Embryo galaxy, the Original TRG, and the Bean Galaxy.

Description The Goldfish galaxy is classified as an elliptical galaxy with an active galactic nucleus (AGN). It is a head-tail radio galaxy or alternatively a Fanaroff-Riley class type I narrow-tailed radio galaxy. When observed, it is found to have a weak tail feature. The head feature on the other hand, is shown little polarized by around 4%. Radio imaging made at 1.4 GHz frequencies has found the head of the Goldfish galaxy as clearly resolved with two radio jets on opposite sides, one of them displaying a bend degree towards the east. A compact radio core is detected at 5 GHz frequencies. When imaged at 15 GHz, the nucleus and only the part of the northern jet is found. The tail feature of the Goldfish galaxy is shown to have an total extension of 261 kiloparsecs and further extended by around 180 kiloparsecs towards the direction of southeast. Earlier observations depicted the nucleus as unresolved. Further observations at sub-arcsecond resolutions have detected traces of radio emission emitting out from the tail region of the Goldfish galaxy. Evidence also found the tail exhibits a helical morphology with jets appearing to spiral around each other before merging back into a single tail feature. A region of increased surface brightness is detected about 170 kiloparsecs away from the core region.

References

External links Goldfish galaxy on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images Goldfish galaxy on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with Goldfish galaxy

Start with the simplest possible case. Write down what Goldfish galaxy 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 Goldfish galaxy 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 Goldfish galaxy 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 Goldfish galaxy

In research: Goldfish galaxy 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 Goldfish galaxy 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: Goldfish galaxy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1974, Draco (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for Goldfish galaxy 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 “Goldfish galaxy” →

Affiliate

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

How to study Goldfish galaxy in 20 minutes

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

Frequently asked questions

What is Goldfish galaxy in simple terms?

Why does Goldfish galaxy 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 Goldfish galaxy?

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 Goldfish galaxy.