astronomy

SDSS J1108+0659

SDSS J1108+0659 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 J1108+0659 rather than just read about it. In short: SDSS J1108+0659 also known as SDSS J110851.04+065901.4, is an active type 2 Seyfert galaxy and a radio-quiet quasar located in the constellation of Leo. The redshift of the galaxy is (z) 0.181 and it was first discovered by astronomers in 2010 from the Sloan Digital Sky Survey (SDSS), based on emission lines in its optical spectrum.

Key takeaways

SDSS J1108+0659 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 J1108+0659 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDSS J1108+0659 from memory before moving on to harder problems.

Reference excerpt

SDSS J1108+0659 also known as SDSS J110851.04+065901.4, is an active type 2 Seyfert galaxy and a radio-quiet quasar located in the constellation of Leo. The redshift of the galaxy is (z) 0.181 and it was first discovered by astronomers in 2010 from the Sloan Digital Sky Survey (SDSS), based on emission lines in its optical spectrum. This galaxy is known to host two active galactic nuclei.

Description SDSS J1108+0659 is in the early stages of a major galaxy merger. It has a low surface brightness component that is described as extended and is located in an eastern direction from the host galaxy. There are also blue clump regions in the western direction. Two nuclei can be seen, one in each component of the galaxy, however one is blue and the other is red. The central supermassive black hole of the northwestern component is estimated to be 8.31 M☉ while the central supermassive black hole of the southeastern component is around 8.05 M☉. The total luminosities of each nuclei are estimated to be 45.24 erg s−1 and 44.02 erg s−1 respectively. The radio structure of SDSS J1108+0659 is compact. When observed with the Very Large Array (VLA) on sub-arcsecond resolution at both 5.0 and 8.5 GHz frequencies, it is made up of three components. A central component is resolved, with a bright appearance and an elongation at the position angle of 113°. There is also a tail feature made up of radio emission, extending more than one arcsecond, on the southwest direction away from the central component and has a steep spectral index. On the northwest side, there is another component that clearly resolved with a flux density of 0.38 mJy. There is also evidence of the presence of ultraviolet continuum emission mainly centering on the northwestern nucleus, extending in the same position angle as the doubly ionized oxygen emission. An outflow is detected with a full width at half maximum of 813 ± 25 kilometers per second and is also being blueshifted in respect to the narrow dominant component.

References

External links SDSS J1108+0659 on SIMBAD SDSS J1108+0659 on HyperLeda

Illustrations

Worked examples

Example 1 — a first encounter with SDSS J1108+0659

Start with the simplest possible case. Write down what SDSS J1108+0659 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 J1108+0659 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 J1108+0659 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 J1108+0659

In research: SDSS J1108+0659 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 J1108+0659 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 J1108+0659 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 2010, Galaxy mergers, so understanding it makes those chapters shorter.
In everyday life: Look for SDSS J1108+0659 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 J1108+0659 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDSS J1108+0659 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 J1108+0659 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SDSS J1108+0659 in simple terms?

Why does SDSS J1108+0659 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 J1108+0659?

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 J1108+0659.