astronomy

NGC 1436

NGC 1436 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 1436 rather than just read about it. In short: NGC 1436 (also called NGC 1437) is a barred spiral galaxy with LINER activity approximately 58 million light-years away from Earth in the constellation of Eridanus. NGC 1436 is a flocculent spiral galaxy lying almost face-on to the Earth.

Key takeaways

NGC 1436 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 1436 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1436 from memory before moving on to harder problems.

Reference excerpt

NGC 1436 (also called NGC 1437) is a barred spiral galaxy with LINER activity approximately 58 million light-years away from Earth in the constellation of Eridanus. NGC 1436 is a flocculent spiral galaxy lying almost face-on to the Earth. It is a member of the Fornax I cluster. NGC 1436 is host to a nuclear star cluster with an estimated mass of around 2 × 107 M☉, and is also host to a supermassive black hole with an estimated mass of around 3.2 × 106 M☉.

Observational history This galaxy was entered twice in the New General Catalogue, first as NGC 1436 and after that as NGC 1437. It was discovered by John Herschel on January 9, 1836, who described it as "very bright, and evidently a globular cluster". It later received designation NGC 1436. It was also observed by Scottish astronomer James Dunlop with his 9" reflector at Parramatta, who described it as "a pretty large faint round nebula, about 3.5' diameter, gradual slight condensation to the centre, very faint at the margin". John Herschel observed this object again on November 28, 1837, assumed it was new and measured an accurate position. It later received second designation in the New General Catalogue (NGC 1437) because of that. Until recently this galaxy was often called NGC 1437, but in recent references it is being called NGC 1436 more and more frequently.

Physical characteristics NGC 1436's spiral arms wind onto the bulge of the galaxy in a bar-like pattern. Within the spiral arms which are tightly wound, there is abundant dust with numerous star-forming regions. The spiral arms are propment within 2 arc minutes of the center but outside that range, they fade into a smooth and featureless disk, suggesting that the galaxy is transtioning into a lenticular galaxy. Addidtionally, the distubution of HI in the disk of the galaxy is truncated within only the inner star forming region of the galaxy which along with the morphology of the galaxy also agrees with the conclusion that the galaxy is transtioning into a lenticular galaxy as a result of the environment of the Fornax Cluster. Observations also show that the inner and outer regions of the disk of NGC 1436 experienced a burst of star formation around 5 billion years ago afterwards followed by a rapid quenching in the outer disc and by slow quenching in the inner disc, which continues to form stars to this day. It is therefore inferred that as NGC 1436 fell though the Fornax Cluster around 5 billion years ago the combination of a tidal interaction and/or ram pressure stripping was able to compress and then remove most of the HI gas from the outer region of the disk, causing a temporary increase of star formation followed by a rapid decrease of its star formation. The inner regions of the disk were much closer to the center of the galaxy which was affected more strongly by gravitational forces of the center of the galaxy which allowed the inner region of the disk to hold on to more of the HI gas. However, since the removal of HI gas from the outer regions of the disk of the galaxy as NGC 1436 fell though the cluster the accection of cold gas to replenish star formation in the inner disk stopped which is why star formation in the inner disk has decreased in the last few billion years but not to zero as star formation is still observed to be ongoing in that region.

See also Types and morphology of galaxies List of NGC objects (1001–2000) Eridanus (constellation)

References

External links

NGC 1436 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 NGC 1436

Start with the simplest possible case. Write down what NGC 1436 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 1436 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 1436 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 1436

In research: NGC 1436 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 1436 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 1436 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1836, Barred spiral galaxies, Discoveries by John Herschel, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1436 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 1436 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1436 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 1436 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1436 in simple terms?

Why does NGC 1436 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 1436?

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 1436.