astronomy

IC 1623

IC 1623 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 IC 1623 rather than just read about it. In short: IC 1623 is a galaxy merger in the constellation Cetus. The galaxy lies about 250 million light years away from Earth, which means, given its apparent dimensions, that IC 1623 is approximately 115,000 light years across.

Key takeaways

IC 1623 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect IC 1623 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 1623 from memory before moving on to harder problems.

Reference excerpt

IC 1623 is a galaxy merger in the constellation Cetus. The galaxy lies about 250 million light years away from Earth, which means, given its apparent dimensions, that IC 1623 is approximately 115,000 light years across. It was discovered by Lewis Swift on November 19, 1897.

Characteristics

IC 1623 consists of two galaxies in the early to mid stages of merger. The nuclei of the two galaxies lie 20 arcseconds apart. The western component (VV 114W) is bright in ultraviolet and optical light and hosts a large number of optically luminous young star clusters. The eastern component, VV 114E, is invisible at UV wavelengths and has prominent dust lanes that cover much of the diffuse light of the underlying stellar population at optical wavelengths. Beyond 1 μm, VV 114E increasingly becomes the dominant luminosity component of the merger, being the brightest source in mid infrared. The whole galaxy shines bright in infrared and it is characterised as a luminous infrared galaxy, with a total infrared luminosity (LIR) of 5 × 1011 L⊙. The James Webb Space Telescope (JWST) observed the nucleus of the eastern galaxy in mid-infrared, revealing a northeastern and a southwestern core. The mid-infrared colors of these cores indicate that the northeastern core is associated with a starburst, while the southwestern core is linked to an active galactic nucleus (AGN). Spectral line analysis suggests the presence of a rapidly accreting intermediate-mass black hole in the southwestern nucleus, which may evolve into a supermassive black hole. Additionally, JWST identified 40 star-forming regions with a total star formation rate ranging from 0.02 to 6 solar masses per year. There is also significant diffuse emission from filaments, primarily attributed to polycyclic aromatic hydrocarbons heated by the star-forming regions and the underlying stellar population.

References

External links

IC 1623 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 IC 1623

Start with the simplest possible case. Write down what IC 1623 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 IC 1623 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 IC 1623 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 IC 1623

In research: IC 1623 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 IC 1623 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: IC 1623 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arp objects, Astronomical objects discovered in 1897, Cetus (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for IC 1623 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 IC 1623 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 1623 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 IC 1623 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 1623 in simple terms?

Why does IC 1623 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 IC 1623?

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 IC 1623.