astronomy

QSO B1954+513

QSO B1954+513 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 B1954+513 rather than just read about it. In short: QSO B1954+513 is a quasar located in the constellation of Cygnus. It has a redshift of (z) 1.22 and it was first discovered by astronomers J.D.

Key takeaways

QSO B1954+513 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 B1954+513 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of QSO B1954+513 from memory before moving on to harder problems.

Reference excerpt

QSO B1954+513 is a quasar located in the constellation of Cygnus. It has a redshift of (z) 1.22 and it was first discovered by astronomers J.D. Kraus and M.R. Gearhart from the Ohio State University Radio Observatory in 1975. The radio spectrum of the source appears to be flat, making this a flat-spectrum radio quasar, but also has low polarization.

Description QSO B1954+513 is classified as a radio-loud quasar. It has an X-ray luminosity of 1043 erg s−1 and its optical spectrum has broad emission lines. The R and B magnitudes of the quasar are estimated to be 17.34 and 18.87 respectively. It is also a blazar mainly due to its X-ray, optical and radio characteristics. A gamma ray flare was detected in October 2020 by Large Area Telescope. The source of QSO B1954+513 is found compact. It has a classical triple Fanaroff-Riley Class II radio structure made up of a radio core and two radio lobes which is orientated in a north to south direction. The source's extent is estimated to be 130 kiloparsecs. Radio imaging by Very Large Array at 5 GHz, showed it has a slightly elongated southern component towards the core. There is a faint extended component resolved by both VLBI Space Observatory Programme and Very Long Baseline Array 5 GHz image. This component is separated from the core by around 0.4 milliarcseconds with a position angle of -27°. The jet of QSO B1954+513 is extended towards northwest direction. Based on observations, it measures at least 10 milliarcseconds in length at an 70° position angle. When shown on an image taken with Very Large Array (VLA), the jet is found connecting with the core towards north. At the end of the jet, there is an elongated knot made of two components. An image taken at 43 GHz showed the quasar has an inner jet which is resolved into 5 jet components. These components are found following a straight line which reaches at 1.3 milliarcseconds. There, the jet then subsequently bends into a jet component located at a -68° position angle. Polarized emission in the bending angle is present, suggesting the jet had interacted with an interstellar cloud which in turn changed the jet's direction. QSO B1954+513 shows signs of rotation measure. Based on high frequency rotation-mapping by Very Long Baseline Array in March 2013, its rotation measure is found either inverted or faded out upon moving from the core region. H I absorption was also detected from the quasar at high ultraviolet luminosities indicating the survival of neutral hydrogen in active galactic nuclei.

References

External links QSO B1954+513 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images QSO B1954+513 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with QSO B1954+513

Start with the simplest possible case. Write down what QSO B1954+513 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 B1954+513 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 B1954+513 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 B1954+513

In research: QSO B1954+513 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 B1954+513 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 B1954+513 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1975, Blazars, so understanding it makes those chapters shorter.
In everyday life: Look for QSO B1954+513 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 B1954+513 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what QSO B1954+513 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 B1954+513 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is QSO B1954+513 in simple terms?

QSO B1954+513 is a quasar located in the constellation of Cygnus. It has a redshift of (z) 1.22 and it was first discovered by astronomers J.D.

Why does QSO B1954+513 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 B1954+513?

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 B1954+513.