astronomy

PG 1012+008

PG 1012+008 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 PG 1012+008 rather than just read about it. In short: PG 1012+008 is a Seyfert 1 galaxy located in the constellation of Sextans. The redshift for this object is (z) 0.186 and it was first discovered in 1984 by astronomers who classified it as a low-redshift quasar displaying several absorption lines in its spectrum.

Key takeaways

PG 1012+008 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PG 1012+008 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PG 1012+008 from memory before moving on to harder problems.

Reference excerpt

PG 1012+008 is a Seyfert 1 galaxy located in the constellation of Sextans. The redshift for this object is (z) 0.186 and it was first discovered in 1984 by astronomers who classified it as a low-redshift quasar displaying several absorption lines in its spectrum.

Description PG 1012+008 is classified as a radio-quiet quasar. Its host is described as a large elliptical galaxy based on a best-fit of its one-dimensional profile. Imaging by the Hubble Space Telescope showed it is also merging with its companion galaxy, with their nuclei estimated to be 6.7 kiloparsecs away from each other. There is a smaller compact galaxy located 12.4 kiloparsecs north from the pair, with evidence suggesting it is also taking part in the interaction process as well. The black hole mass of the galaxy is estimated to be 8.42 M☉ based on both velocity and size measurements of the broad-line region, with a total magnitude of -23.26. The radio structure of the galaxy is compact. High-sensitivity radio imaging made by the Very Large Array have found the source is mainly made up of a central nuclear point source with a long jet towards the southeast. The jet itself appears to display a bend to the east based on both comparisons of the outer and inner isotopes. Optical imaging also showed the same structure indicating it and the gas from the narrow-line region are immediately connecting with each other. B-array mapping showed no evidence of extensional features although there is a prominent short extension northwest. Observations noted the central active galactic nucleus of the galaxy is powering outflows. It has a blue asymmetry which becomes red when reaching south of the nucleus, an indication of material flowing in the direction of southeast. There is also a blue component described as displaced nearly by 1000 kilometers per second, suggesting the outflow is fast. The galaxy displays a narrow-line region described as having a pear-shaped morphology. When observed, the radio emission is mainly dominated by a central point source showing a slight deviation. The narrow-line region is also described as spatially weak upon reaching 6 kiloparsecs from the center indicating it has a large extent. The full width at half maximum velocity of the region line profile is estimated as 1,050 kilometers per second, with the doubly ionized oxygen emission described narrower when comparing to the emission located in the central spectrum. This suggests an unresolved outflowing component.

References

External links PG 1012+008 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images PG 1012+008 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with PG 1012+008

Start with the simplest possible case. Write down what PG 1012+008 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 PG 1012+008 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 PG 1012+008 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 PG 1012+008

In research: PG 1012+008 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 PG 1012+008 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: PG 1012+008 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1984, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for PG 1012+008 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 PG 1012+008 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PG 1012+008 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 PG 1012+008 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PG 1012+008 in simple terms?

Why does PG 1012+008 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 PG 1012+008?

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 PG 1012+008.