astronomy

Markarian 1014

Markarian 1014 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 Markarian 1014 rather than just read about it. In short: Markarian 1014 known as PG 0157+001 is a quasar located in the constellation Cetus. It is located at a distance of 2.47 billion light years from Earth and is classified as a Seyfert galaxy as well as an ultraluminous infrared galaxy (ULIRG).

Key takeaways

Markarian 1014 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Markarian 1014 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Markarian 1014 from memory before moving on to harder problems.

Reference excerpt

Markarian 1014 known as PG 0157+001 is a quasar located in the constellation Cetus. It is located at a distance of 2.47 billion light years from Earth and is classified as a Seyfert galaxy as well as an ultraluminous infrared galaxy (ULIRG). With a diameter of more than 770,000 light-years across, it is one of the largest galaxies known.

Characteristics Markarian 1014 is an active nucleus-dominated galaxy with a total far-infrared luminosity of 9.93 × 1011 erg s−1 cm−2. Apart from being radio-quiet, it contains optical emission lines considered broad, measured with a full-width half maximum of Hβ > 4000 km s−1. In additional to optical emission lines, Markarian 1014 shows emission features of Lyα, N v and O vi, as well as polycyclic aromatic hydrocarbon. Markarian 1014 is also one of the brightest quasars classified as a warm ULIRG. It is currently in a transitional phase from a typical ULIRG to an ultraviolet-excessive quasar. It has an X-ray emission measured at 2-10 KeV luminosity of 1043.80 erg s−1 when exhibiting a molecular outflow. The mass of the black hole in the center of Markarian 1014 is estimated 2.5+0.6-0.6 × 108 MΘ based on an MBH measurement carried out by the Seoul National University AGN Monitoring Project. According to imaging and spectra of its host galaxy, Markarian 1014 is described as spiral-like, but also has a budge + disk morphology. It has a curved tidal tail found extending 60 kiloparsecs towards the north-east, suggesting it has gone through a major merger with a disk galaxy. The tidal tail is known to show lengthy low surface brightness extension with another secondary tail shown faint but rotating symmetrically. Furthermore, the galaxy has twisted spiral isotopes within the 4 kiloparsec central radius hinting its spiral disk is undergoing a starburst or tidal debris caused by the merger. There is also the presence of carbon monoxide (CO) emission in the galaxy. Based on the relationship between its brightness and hydrogen gas (H2) surface density, the gas mass is estimated 4 × 1010 MΘ. A 8.4 -GHz VLA image shows Markarian 1014 has a triple structure along the east–west direction. On both sides of its central core, two lobes are found with 1.1 arcsec from each other. There is also another component found faint and located at the optical nucleus position. According to the spectral index of the component, it is -1.11 ± 0.02 between 5 and 45 GHz.

Stellar population A B' - R' color map is presented for Markarian 1014. According to spectroscopy made on its regions with a steeper blue continuum spectrum, it has a young stellar population of stars aged between 180 and 290 million years old. These stars are mainly found inside a clump at the eastern region and along the north edge of its tidal tail, and both southwest and east from its nucleus. The galaxy also has other regions that are seen as redder in a B' - R' color map. This suggests much older stars aged approximately 1 billion years old but with little contribution from the old underlying population.

References

Illustrations

Worked examples

Example 1 — a first encounter with Markarian 1014

Start with the simplest possible case. Write down what Markarian 1014 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 Markarian 1014 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 Markarian 1014 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 Markarian 1014

In research: Markarian 1014 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 Markarian 1014 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: Markarian 1014 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cetus (constellation), Galaxy mergers, IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for Markarian 1014 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 Markarian 1014 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Markarian 1014 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 Markarian 1014 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Markarian 1014 in simple terms?

Why does Markarian 1014 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 Markarian 1014?

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 Markarian 1014.