astronomy

UGC 9799

UGC 9799 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 UGC 9799 rather than just read about it. In short: UGC 9799 also known as 3C 317, is a radio galaxy located in the constellation of Serpens. The redshift of the galaxy is (z) 0.034 estimating a light-travel time distance of 543 million light-years and it was first discovered as an astronomical radio source by astronomers in 1959.

Key takeaways

UGC 9799 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect UGC 9799 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of UGC 9799 from memory before moving on to harder problems.

Reference excerpt

UGC 9799 also known as 3C 317, is a radio galaxy located in the constellation of Serpens. The redshift of the galaxy is (z) 0.034 estimating a light-travel time distance of 543 million light-years and it was first discovered as an astronomical radio source by astronomers in 1959. It is classified as a type-cD galaxy and is the brightest cluster galaxy of the cluster Abell 2052.

Description UGC 9799 is categorized as an elliptical galaxy with a slightly elongated appearance but its nucleus is unresolved. There is an ultraviolet filament present in the galaxy four kiloparsecs to the south from the nucleus region. This evidence suggests star formation activity is triggered by a galaxy merger of an nearby satellite galaxy. Imaging made by the Hubble Space Telescope (HST), found the core isophotes seem to be extending towards a dark band feature suggested to be a diffused dust lane. A secondary nucleus is likely present in UGC 9799. The galaxy contains a radio source that has a steep radio spectrum. When observed with the Very Large Array (VLA), the structure is mainly irregular and its spectra index is mainly 0.8 below the frequencies of 200 MHz but gets much steeper upon reaching more than 750 MHz. A compact radio core is found at the center of the source; however there are no signs that the core is significantly variable. There is a large bipolar structure surrounding the core region, which in turn is enveloped inside a halo. There is also a loop structure linking together with its northern radio lobe and a plume feature. New observations at 4.9 GHz found the radio morphology is classified as S-shaped with two short jet features that have a bending angle of 5 milliarcseconds from the radio peak. At 8.3 GHz, these jets are shown to have an alignment to around -32°. Studies published in 1995 and in 2017 have found the presence of globular clusters inside UGC 9799 based on imaging. Further evidence also found there are 46,000 clusters in total, making these the largest amount found so far. A supermassive black hole mass of 108 M☉ has been estimated for the galaxy.

References

External links UGC 9799 on SIMBAD UGC 9799 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 UGC 9799

Start with the simplest possible case. Write down what UGC 9799 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 UGC 9799 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 UGC 9799 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 UGC 9799

In research: UGC 9799 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 UGC 9799 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: UGC 9799 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3C objects, 4C objects, Active galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for UGC 9799 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 UGC 9799 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what UGC 9799 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 UGC 9799 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UGC 9799 in simple terms?

Why does UGC 9799 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 UGC 9799?

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 UGC 9799.