astronomy

IC 4040

IC 4040 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 4040 rather than just read about it. In short: IC 4040 is a type SABc spiral galaxy with a bar in Coma Berenices. It is located 353 million light-years away from the Solar System and has an estimated diameter of 105,000 light-years making it slightly larger than the Milky Way.

Key takeaways

IC 4040 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 4040 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 4040 from memory before moving on to harder problems.

Reference excerpt

IC 4040 is a type SABc spiral galaxy with a bar in Coma Berenices. It is located 353 million light-years away from the Solar System and has an estimated diameter of 105,000 light-years making it slightly larger than the Milky Way. IC 4040 was discovered on April 12, 1891, by Guillaume Bigourdan and is a member of the Coma Cluster.

Characteristics IC 4040 is considered a jellyfish galaxy due to its close proximity to the cluster where gas is stripped from the galaxy by the action of ram pressure. A radio continuum tail can be seen extending outwards from the galaxy, showing widespread occurrence of relativistic electrons and magnetic fields which is being removed by pressure. The stripped electrons are re-accelerated by turbulence and ICM shocks or by new supernovae, since massive stars can be found in H II regions that are located in its ram pressure stripped tail. According to studies, extended ionized gas can be found surrounding IC 4040. This shows increased radial velocities which reaches up between 400 and 800 kilometer per seconds within distance from the nucleus of the galaxy. Not to mention, a low velocity filament is found at the southeastern edge of IC 4040 which exhibits blue continuum and strong Hα emission. The widths exceeds 200 Å and much more compared to 1000 Å for some knots, indicating the intensive activity of star formation. Some of these filaments show signs of shock emission-line spectra suggesting shock heating plays an important function in excitation and ionization of extended ionized gas. IC 4040 also presents a strong radio source compared to galaxies of type E/SO.

Supernovae Two supernovae have been discovered in IC 4040 so far: PTF11gdh in 2011 and SN 2022jo in 2022.

PTF11gdh PTF11gdh was discovered on June 21, 2011, in IC 4040 by Palomar Transient Factory. The supernova was located 0" east and 0" south of the nucleus. The supernova was Type la.

SN 2022jo SN 2022jo was discovered in IC 4040 on January 9, 2022, by a group of astronomers; Chunpeng Bi, Jianlin Xu, Mi Zhang, Jingyuan Zhao, Guoyou Sun, Jiangao Ruan and Wenjie Zhou from Xingming Observatory. SN 2022jo was found at Right Ascension (13hr 00min 37s .666) and Declination (+28 degrees 0.3' 25".71). It was located 0".0 east and 0".0 north of the nucleus. The supernova was Type II.

References

Illustrations

Worked examples

Example 1 — a first encounter with IC 4040

Start with the simplest possible case. Write down what IC 4040 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 4040 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 4040 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 4040

In research: IC 4040 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 4040 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 4040 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1891, Coma Berenices, Coma Cluster, so understanding it makes those chapters shorter.
In everyday life: Look for IC 4040 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 4040 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 4040 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 4040 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 4040 in simple terms?

Why does IC 4040 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 4040?

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 4040.