astronomy

J1223+5409

J1223+5409 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 J1223+5409 rather than just read about it. In short: J1223+5409 also known as SDSS J122313.21+540906.5, is a type 1 Seyfert galaxy located in the constellation of Ursa Major. The redshift of the object is (z) 0.15 and it was first discovered by astronomers from the Second Byurakan Sky Survey (SBS) in April 1994 where it was designated as SBS 1220+544.

Key takeaways

J1223+5409 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect J1223+5409 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of J1223+5409 from memory before moving on to harder problems.

Reference excerpt

J1223+5409 also known as SDSS J122313.21+540906.5, is a type 1 Seyfert galaxy located in the constellation of Ursa Major. The redshift of the object is (z) 0.15 and it was first discovered by astronomers from the Second Byurakan Sky Survey (SBS) in April 1994 where it was designated as SBS 1220+544. It is classified to be radio-loud and such contains an active galactic nucleus (AGN).

Description J1223+5409 is a broad-line radio galaxy (BLRG) based on a spectroscopic identification of active galaxies from the RASS-Green Bank catalogue conducted in September 1998. The host galaxy has been classified as a disturbed elliptical galaxy with presence of both shell features and a tidal tail, suggestive of a galaxy merger. A study published in November 2020, has found it is a dual active galactic nucleus (DAGN) candidate with both blueshifted and redshifted doubly ionized oxygen emission lines shown having a velocity offset of 232 kilometers per seconds. The singly ionized nitrogen (N II) and hydrogen alpha (Hα) emission lines in the galaxy's optical spectrum have total fluxes of 822 and 352 × 10−17 erg s−1 cm−2 respectively. The radio structure of J1223+5409 is found to be very compact. When observed by both Very Large Array and Very Large Sky Survey (VLASS), it has a central radio core with a bipolar radio emission structure extending outwards from it. This structure detected by VLASS is suggested to have an elongated appearance along the radio axis direction and has an orientation of 21°. The total radio luminosity is estimated to be 25.4 W Hz−1. A spectral index for the radio core component has been found to have a spectral index of -0.5 ± 0.3. The integrated flux densities for the two components at 15 GHz frequencies, are found to be 5.1 ± 0.5 and 0.7 ± 0.1 mJy.

References

External links J1223+5409 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 J1223+5409

Start with the simplest possible case. Write down what J1223+5409 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 J1223+5409 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 J1223+5409 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 J1223+5409

In research: J1223+5409 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 J1223+5409 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: J1223+5409 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 4C objects, Active galaxies, Astronomical objects discovered in 1994, so understanding it makes those chapters shorter.
In everyday life: Look for J1223+5409 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 J1223+5409 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what J1223+5409 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 J1223+5409 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is J1223+5409 in simple terms?

Why does J1223+5409 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 J1223+5409?

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 J1223+5409.