astronomy

SDSS J095418.15+471725.1

SDSS J095418.15+471725.1 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 J095418.15+471725.1 rather than just read about it. In short: SDSS J095418.15+471725.1 also known as RGG 11 or J0954+47 is a dwarf galaxy located in the constellation of Ursa Major. The redshift of the galaxy is (z) 0.032 and it was first discovered in a study of dwarf galaxies which are shown to contain active black holes in 2013.

Key takeaways

SDSS J095418.15+471725.1 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 J095418.15+471725.1 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDSS J095418.15+471725.1 from memory before moving on to harder problems.

Reference excerpt

SDSS J095418.15+471725.1 also known as RGG 11 or J0954+47 is a dwarf galaxy located in the constellation of Ursa Major. The redshift of the galaxy is (z) 0.032 and it was first discovered in a study of dwarf galaxies which are shown to contain active black holes in 2013.

Description SDSS J095418.15+4717255.1 is classified as a dwarf lenticular galaxy with a type S0 morphology. It contains traces of classical structures, with the inner component being described as having a round appearance and a half-light radius estimated at about 0.13 kiloparsecs. There is also an outer component that closely resembles a classic exponential disk but is also one of the largest features shown. The central supermassive black hole mass of the galaxy is estimated to be 4.9 M☉ and the total star formation is 1.90 M☉ per year. It lacks spiral arms based on imaging made by the Hubble Space Telescope (HST). Studies published in 2019 have found the galaxy contains the presence of an active galactic nucleus (AGN). The AGN is also driving the outflows from the galaxy with velocities reaching 719 ± 9.6 kilometers per second. Another study published in 2024, has found there are also absorption features that are blueshifted. A single ionized helium emission line has also been detected. The galaxy also appears to contain no major star formation and is transitioning from a star-forming blue galaxy to a passive red dead galaxy. A study has found one of the velocity components is blueshifted in respect of the systemic velocity with a line width that is estimated to be reaching a velocity of 1100 kilometers per second. This suggests the component is connected with fast outflows. Strong signatures of X-ray emission have been detected in the galaxy of around 9.77 × 1039 erg s−1.

References

External links SDSS J095418.15+471725.1 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 SDSS J095418.15+471725.1

Start with the simplest possible case. Write down what SDSS J095418.15+471725.1 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 J095418.15+471725.1 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 J095418.15+471725.1 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 J095418.15+471725.1

In research: SDSS J095418.15+471725.1 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 J095418.15+471725.1 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 J095418.15+471725.1 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 2013, Dwarf galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for SDSS J095418.15+471725.1 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 SDSS J095418.15+471725.1 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDSS J095418.15+471725.1 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 J095418.15+471725.1 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SDSS J095418.15+471725.1 in simple terms?

Why does SDSS J095418.15+471725.1 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 J095418.15+471725.1?

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 J095418.15+471725.1.