astronomy

J1000+1242

J1000+1242 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 J1000+1242 rather than just read about it. In short: J1000+1242 known as SDSS J1000+1242 or J1000+12 is a radio-quiet type-2 quasar, located in the constellation Leo. It is located 2 billion light years from Earth and is classified as a Seyfert galaxy.

Key takeaways

J1000+1242 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect J1000+1242 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of J1000+1242 from memory before moving on to harder problems.

Reference excerpt

J1000+1242 known as SDSS J1000+1242 or J1000+12 is a radio-quiet type-2 quasar, located in the constellation Leo. It is located 2 billion light years from Earth and is classified as a Seyfert galaxy.

Characteristics J1000+1242 has disturbed morphology indicating a galaxy merger. A tidal tail is clearly seen elongating away from the host galaxy towards south by 72 kiloparsecs (kpc), terminating at a location of a small source which implies a tidal dwarf galaxy. Two unique nuclear emission sources are located in the galaxy. They have a projected separation of around 1.5 kpc indicating the merger resulted J1000+1242 having two active galactic nuclei (AGN) or from both sides of its narrow-line region concealed by a torus of gas and warm dust, or a circumnuclear ring. A bright emission line region is also found northeast of the nucleus of J1000+1242, with an irregular morphology indicating an outflowing bi-polar superbubble. J1000+1242 has features of a typical AGN. This includes a radio core and hotspot. There is a presence of a deflected radio jet producing diffused lobes in both southeast and northwest directions. Not to mention, J1000+1242 has broad line regions producing emission lines with widths reaching to w80 of 850 km s−1. In both around and inside its radio lobes measuring ~ 10 kpc, J1000+1242 has five filamentary molecular gas structures. They seem to wrap around the radio lobes, which ~ 9 percent of the total molecular gas mass is found enclosed within these structures.

Star formation J1000+1242 has an estimated star formation rate of 50 ± 10 M☉ yr−1 with infrared luminosity deriving from its star formation in an 8-1000 ɥm range, of 45.0+0.1-0.2 erg s−1.

Black hole The black hole in J1000+1242 is estimated to be 8.47 ± 0.76 M☉ based on MBH-σ* relation.

References

External links 2MASX J10001317+1242261 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with J1000+1242

Start with the simplest possible case. Write down what J1000+1242 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 J1000+1242 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 J1000+1242 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 J1000+1242

In research: J1000+1242 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 J1000+1242 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: J1000+1242 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Galaxy mergers, IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for J1000+1242 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 J1000+1242 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what J1000+1242 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 J1000+1242 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is J1000+1242 in simple terms?

J1000+1242 known as SDSS J1000+1242 or J1000+12 is a radio-quiet type-2 quasar, located in the constellation Leo. It is located 2 billion light years from Earth and is classified as a Seyfert galaxy.

Why does J1000+1242 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 J1000+1242?

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 J1000+1242.