astronomy

NGC 4713

NGC 4713 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 NGC 4713 rather than just read about it. In short: NGC 4713 is a spiral galaxy in the constellation Virgo. The galaxy lies about 45 million light years away from Earth, which means, given its apparent dimensions, that NGC 4713 is approximately 40,000 light years across.

Key takeaways

NGC 4713 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 4713 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4713 from memory before moving on to harder problems.

Reference excerpt

NGC 4713 is a spiral galaxy in the constellation Virgo. The galaxy lies about 45 million light years away from Earth, which means, given its apparent dimensions, that NGC 4713 is approximately 40,000 light years across. It was discovered by William Herschel on April 17, 1786.

Characteristics The galaxy has a small bright nucleus in a short bar, about 0.35 arcminutes long. A pseudoring with a diameter of 0.4 arcminutes is visible. Two filamentary spiral arms emerge from the bar with many knots and fragments. The spiral arm pattern is smooth and symmetrical. The galaxy is a strong source of H-alpha. In images by Hubble Space Telescope NGC 4713 contains a slightly resolved nuclear star cluster with an equivalent-axis half-light radius equal to 0.″07 (5 pc). The mass of the cluster is estimated to be 106.43 ± 0.31 (1.3 – 5.5 millions) M☉. The nucleus also hosts a black hole with an estimated mass of 104.56 ± 1.66 (800 – 1.7 millions) M☉ based on the Sérsic profile of the star cluster. Based on other models, the mass of the central back hole is estimated to be 600 to 9,000 solar masses, which positions it as an intermediate mass black hole. Its nucleus has a spectrum that categorises it as a type 2 transition object, lying between an HII region and a LINER. The galaxy also emits X-Rays and the Fe-K line is faintly detected. The data from Chandra X-ray Observatory show a point X-ray source with a luminosity 3.1+1.9−1.4×1038 erg/s. It is a source of soft X-rays. The galaxy has a large hydrogen disk, as visible in hydrogen line. The disk appears wrapped beyond the optical disk. The central region of the galaxy, were the bar is located, is deficient in hydrogen. The kinematics suggest that the faint outer disk of the galaxy rotates at an angle with respect to the rest of the galaxy.

Nearby galaxies NGC 4713 is a member of the NGC 4753 Group, also known as LGG 315. Other members of the group include NGC 4643, NGC 4753, NGC 4771, NGC 4845, NGC 4900, NGC 4904, and NGC 4808. It is part of the Virgo II Groups, a chain of groups extending from the Virgo Cluster.

Gallery

References

External links

NGC 4713 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images NGC 4713 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with NGC 4713

Start with the simplest possible case. Write down what NGC 4713 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 NGC 4713 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 NGC 4713 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 NGC 4713

In research: NGC 4713 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 NGC 4713 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: NGC 4713 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1786, Discoveries by William Herschel, Intermediate spiral galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4713 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 NGC 4713 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4713 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 NGC 4713 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4713 in simple terms?

Why does NGC 4713 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 NGC 4713?

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 NGC 4713.