astronomy

SDSS J211852.96−073227.5

SDSS J211852.96−073227.5 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 SDSS J211852.96−073227.5 rather than just read about it. In short: SDSS J211852.96−073227.5 is a narrow-line Seyfert galaxy with an active galactic nucleus located in the constellation of Aquarius. The redshift of the object is (z) 0.26 and it was first discovered in April 2018 by astronomers who categorized the object as gamma-ray emitting.

Key takeaways

SDSS J211852.96−073227.5 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SDSS J211852.96−073227.5 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDSS J211852.96−073227.5 from memory before moving on to harder problems.

Reference excerpt

SDSS J211852.96−073227.5 is a narrow-line Seyfert galaxy with an active galactic nucleus located in the constellation of Aquarius. The redshift of the object is (z) 0.26 and it was first discovered in April 2018 by astronomers who categorized the object as gamma-ray emitting.

Description SDSS J211852.96−073227.5 is classified as a late stage galaxy merger involving two late-type galaxies. When imaged, it is found to have two clearly resolved nuclei that is separated from each other by 12 kiloparsecs. Further observations, showed the merging companion galaxy at the same redshift, has presence of emission lines in its optical spectrum, confirming it a Type 2 Seyfert galaxy. A ring of Hydrogen-alpha material is shown surrounding the main galaxy's nucleus, with a curved filament feature connecting both nuclei. The supermassive black hole mass of the primary galaxy is estimated to be 3 × 107 M☉. Young stellar population of stars mainly between 0.5 and 2.5 billion years old, are located mainly inside the inner region of the companion galaxy. Imaging made with Very Long Baseline Array (VLBA), showed SDSS J211852.95−073227.5 has a complex radio structure. When imaged, it has a core-jet morphology with a radio core showing an inverted radio spectrum at high frequencies while at lower frequencies, the spectrum is steep. The core is also found variable given that variations are shown. There is evidence of an extended structure on parsec-scales imaged at 22 and 43 GHz frequencies based on imaging by VLBI Exploration of Radio Astrometry (VERA). A dark matter halo of material is surrounding the core region. Further imaging, has found there is a radio jet emerging outwards from the galaxy. This has been suggested to be triggered during the merging process, given the fact its kinematic age is much younger compared to the beginning of the merger between 0.5 and 2 billion years ago. VLBA has shown the jet components are mainly weak with the entire jet being perpendicular towards the axis of the galaxy.

References

External links SDSS J211852.96−073227.5 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images SDSS J211852.96-073227.5 on HyperLeda (PGC=3431405)

Illustrations

Worked examples

Example 1 — a first encounter with SDSS J211852.96−073227.5

Start with the simplest possible case. Write down what SDSS J211852.96−073227.5 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 SDSS J211852.96−073227.5 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 SDSS J211852.96−073227.5 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 SDSS J211852.96−073227.5

In research: SDSS J211852.96−073227.5 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 SDSS J211852.96−073227.5 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: SDSS J211852.96−073227.5 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Aquarius (constellation), Astronomical objects discovered in 2018, so understanding it makes those chapters shorter.
In everyday life: Look for SDSS J211852.96−073227.5 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “SDSS J211852.96−073227.5” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study SDSS J211852.96−073227.5 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDSS J211852.96−073227.5 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 SDSS J211852.96−073227.5 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SDSS J211852.96−073227.5 in simple terms?

Why does SDSS J211852.96−073227.5 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 SDSS J211852.96−073227.5?

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 SDSS J211852.96−073227.5.