astronomy

QSO B1611+343

QSO B1611+343 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 QSO B1611+343 rather than just read about it. In short: QSO B1611+343 also known as DA 406, is a blazar located in the northern constellation of Corona Borealis. Its redshift is (z) 1.4 and it is classified as an optically violent variable quasar or an OVV quasar although lowly polarized.

Key takeaways

QSO B1611+343 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect QSO B1611+343 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of QSO B1611+343 from memory before moving on to harder problems.

Reference excerpt

QSO B1611+343 also known as DA 406, is a blazar located in the northern constellation of Corona Borealis. Its redshift is (z) 1.4 and it is classified as an optically violent variable quasar or an OVV quasar although lowly polarized. Its radio spectrum is flat, making it a flat-spectrum source with a spectral index of -0.04.

Description QSO B1611+343 is variable on the electromagnetic spectrum, showing a low-frequency radio outburst in 1987 and temporal significant variations. In the 1983–1991 period it displayed optical fluxes ranging from 0.27 to 0.7 mJy with a short-term flickering period recorded on time scales between February 28, 1995 and 8 April 1996. A near-infrared flare was detected in June 2012 by astronomers during the monitoring of gamma ray sources by the Fermi Gamma-ray Space Telescope. The light curves of the object showed it to be moderately variable at 2.7, 4.9 and 8.0 GHz frequencies, exhibiting a major flux surging below 880 MHz. QSO B1611+343 is described as a powerful core-dominated source. When imaged by the Very Large Array, it is found to have a triple morphology with its southern extension being consistent with the position angle of a bright component located in the south. Results of the snapshot observations at 92 centimeters by Very Long Baseline Interferometry (VLBI) showed the source is fully resolved with a diffused component containing 37% of the flux density. On milliarcsecond scales at 2.32 GHz observed by VLBI, the radio core is found to be elongated and exposed, measuring 3 milliarcseconds in diameter. This core also has the highest rotation measure, starting at −519±55 rad m–2 before declining to −44±55 rad m−2 upon reaching 10 parsecs within it. The jet of QSO B1611+343 in multi-epoch observations is moving in a southerly direction, subsequently terminating at a bright diffused component located 2.9 milliarcseconds from the core. When imaged in high resolution observations by VLBI, it bends eastwards by 3 milliarcseconds, displaying superluminal motion. Based on observations it contains at least four components; all of them moving at apparent speeds of 6.7±1.6, 3.8±1.4, 7.6±1.3 and 11.5±2.3 h−1 c. Polarized weak flux was also discovered southwards from one of the components, likely associated with a stationary oblique shock, causing the jet to change its trajectory. The supermassive black hole in QSO B1611+343 has a mass of 9.69 ± 0.02, estimated from a singly ionized magnesium line. Based on studies, its accretion rate should be approximately M0.9 = 5.3 M☉ yr−1 and Log M0.9982 = 3.7 M☉ yr−1.

References

External links QSO B1611+343 on SIMBAD QSO B1611+343 on NASA/IPAC Database QSO B1611+343 on Hyperleda

Illustrations

Worked examples

Example 1 — a first encounter with QSO B1611+343

Start with the simplest possible case. Write down what QSO B1611+343 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 QSO B1611+343 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 QSO B1611+343 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 QSO B1611+343

In research: QSO B1611+343 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 QSO B1611+343 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: QSO B1611+343 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Blazars, Corona Borealis, so understanding it makes those chapters shorter.
In everyday life: Look for QSO B1611+343 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 QSO B1611+343 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what QSO B1611+343 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 QSO B1611+343 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is QSO B1611+343 in simple terms?

Why does QSO B1611+343 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 QSO B1611+343?

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 QSO B1611+343.