astronomy

RGZ J172749.5+534647

RGZ J172749.5+534647 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 RGZ J172749.5+534647 rather than just read about it. In short: RGZ J172749.5+534647 also known as J172749+534651, is a radio galaxy in the constellation of Draco. The redshift of the galaxy is (z) 0.207.

Key takeaways

RGZ J172749.5+534647 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect RGZ J172749.5+534647 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RGZ J172749.5+534647 from memory before moving on to harder problems.

Reference excerpt

RGZ J172749.5+534647 also known as J172749+534651, is a radio galaxy in the constellation of Draco. The redshift of the galaxy is (z) 0.207.

Description RGZ J172749.5+534647 is a red luminous galaxy residing as the brightest cluster galaxy (BCG) of the galaxy cluster, WHL J172749.7+534652 with at least 18 confirmed galaxy member candidates. The r-band magnitude for the galaxy is estimated to be 17.22 magnitude. The absolute magnitude of the galaxy is -22.77. The nucleus is categorized as active and it is a Fanaroff-Riley Class Type II radio galaxy. A study published in 2011, reported the presence of both a radio core and hot spot features. The total radio luminosity is 26.6 W Hz-1 and the radio flux density is 1040.5 mJy at 1.4 GHz frequencies. The source has a total angular size of 146.4 arcseconds and a linear size of 496.37 kiloparsecs. The radio lobes are resolved, with the eastern radio lobe having a 1.4 GHz flux density of 188.2 mJy, while the western lobe has a flux density of 486.7 mJy, based on data made by the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) at 3σ flux density cuts. The lengths of the lobes at 3σ cuts are 193 and 239 kiloparsecs respectively. It is also a giant radio source approximately 4.5 arcseconds in extent and is further categorized as a double-lobed galaxy with a possible core-jet structure.

References

External links RGZ J172749.5+534647 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 RGZ J172749.5+534647

Start with the simplest possible case. Write down what RGZ J172749.5+534647 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 RGZ J172749.5+534647 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 RGZ J172749.5+534647 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 RGZ J172749.5+534647

In research: RGZ J172749.5+534647 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 RGZ J172749.5+534647 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: RGZ J172749.5+534647 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Draco (constellation), LEDA objects, so understanding it makes those chapters shorter.
In everyday life: Look for RGZ J172749.5+534647 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 RGZ J172749.5+534647 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RGZ J172749.5+534647 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 RGZ J172749.5+534647 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RGZ J172749.5+534647 in simple terms?

RGZ J172749.5+534647 also known as J172749+534651, is a radio galaxy in the constellation of Draco. The redshift of the galaxy is (z) 0.207.

Why does RGZ J172749.5+534647 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 RGZ J172749.5+534647?

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 RGZ J172749.5+534647.