astronomy

RX J1633.3+4718

RX J1633.3+4718 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 RX J1633.3+4718 rather than just read about it. In short: RX J1633.3+4718 (RX J1633+4718) known as RXS J16333+4718 according to VLBI Network observations, is a narrow-line Seyfert 1 galaxy, located in the constellation of Hercules. It has a redshift of (z) 0.116 and is located 1.75 billion light years from Earth.

Key takeaways

RX J1633.3+4718 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect RX J1633.3+4718 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RX J1633.3+4718 from memory before moving on to harder problems.

Reference excerpt

RX J1633.3+4718 (RX J1633+4718) known as RXS J16333+4718 according to VLBI Network observations, is a narrow-line Seyfert 1 galaxy, located in the constellation of Hercules. It has a redshift of (z) 0.116 and is located 1.75 billion light years from Earth. The first known reference to this galaxy comes from a radio source which was identified in 1995 in the IRAS catalogue as F16319+4725.

Description RX J1633.3+4718 contains a radio loud active galactic nucleus (AGN) with a measured radio loudness parameter of R5 = fv(5 GHz)/fv(4400Å) > 100. Furthermore, the AGN is hosted in a disk galaxy found interacting with a starburst galaxy. The two nuclei of both galaxies are about 8 kiloparsecs from each other. Two unique components are found in RX J1633.3+4718, mainly a core component and a north component. Both of the components are connected with the two galaxies in the interacting system, with measured flux densities of 24.48 mJy and 0.79 mJy. The core component is unresolved. It has an inverted radio spectrum whereas the spectral index is found steep. The core component is suggested to be significantly variable, hinting at the presence of jet activity in RX J1633.3+4718. This is further confirmed by the jet's high brightness temperature of 1011.3 K and parsec-scale core-jet radio morphology when seen in high resolution observations at 1.7 and 5 GHz respectively. The north component on the other hand, is fainter and located at a position angle of 352°, away from the core by 3.8 arcsec. The accretion disk of RX J1633.3+4718 is shown to have ultrasoft excess X-ray emission. It is lower than 0.5 KeV with the temperature of the galaxy's disk estimated to be 40 electronvolts based on a disc model for soft excess. The mass of the black hole in RX J1633+4718 is estimated to be 3 million M☉ while a bolometric luminosity of Lbol ≈ 1.51 × 1044 erg s−1 was derived from an unabsorbed flux measurement in a 0.001-100 KeV energy band.

References

External links RX J1633.3+4718 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with RX J1633.3+4718

Start with the simplest possible case. Write down what RX J1633.3+4718 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 RX J1633.3+4718 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 RX J1633.3+4718 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 RX J1633.3+4718

In research: RX J1633.3+4718 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 RX J1633.3+4718 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: RX J1633.3+4718 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Hercules (constellation), IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for RX J1633.3+4718 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 RX J1633.3+4718 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RX J1633.3+4718 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 RX J1633.3+4718 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RX J1633.3+4718 in simple terms?

Why does RX J1633.3+4718 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 RX J1633.3+4718?

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 RX J1633.3+4718.