astronomy

RXC J1504.1−0248 BCG

RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG rather than just read about it. In short: RXC J1504.1−0248 BCG (short for RXC J1504.1−0248 Brightest Cluster Galaxy) is a large elliptical galaxy residing as the brightest cluster galaxy of an X-ray luminous and cool core galaxy cluster, RXC J1504.1−0248. It is located in the constellation of Libra and it has a redshift of (z) 0.216.

Key takeaways

RXC J1504.1−0248 BCG belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect RXC J1504.1−0248 BCG to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RXC J1504.1−0248 BCG from memory before moving on to harder problems.

Reference excerpt

RXC J1504.1−0248 BCG (short for RXC J1504.1−0248 Brightest Cluster Galaxy) is a large elliptical galaxy residing as the brightest cluster galaxy of an X-ray luminous and cool core galaxy cluster, RXC J1504.1−0248. It is located in the constellation of Libra and it has a redshift of (z) 0.216. It was first discovered by astronomers from the Las Campanas Survey (LCRS) in July 1999.

Description RXC J1504.1−0248 BCG is found to be the central dominant galaxy of the RXC J1504.1−0248 galaxy cluster. The optical spectrum of the galaxy is described by narrow emission lines of low-excitation, with strong doubly ionized oxygen lines as well as luminous hydrogen alpha and singly ionized neon lines. The absolute magnitude of this galaxy is estimated to be -24. The nucleus of RXC J1504.1−0248 BCG is found to be active and it has been classified as a low-ionization nuclear emission-line region (LINER) galaxy. When observed, it has found to have two sources that are located both east and west from its optical position. Imaging made with MERLIN, showed the sources as two components with an angular separation of 0.5 arcseconds which in turn, corresponds to around 1,750 parsecs. The flux densities of both components are estimated to be 28.78 ± 0.07 and 0.60 ± 0.07 mJy respectively. The component on the eastern side has a flat radio spectrum at 18–6–3.5 centimeters, while the component on the western side has a steep spectrum that flattens towards short wavelengths. The total brightness of the source is estimated to be 62 mJy at 1.4 GHz frequencies. The galaxy is described as extremely large. Its appearance is described to be regular and it is found to show no signs of any recent galaxy mergers based on Sloan Digital Sky Survey (SDSS) imaging. A study published in 2010, has found the galaxy has a blue appearance, containing a mix of an old stellar population and a population of young stars. The total star formation rate of the galaxy is estimated to be 140 M☉ per year. Evidence also showed most of star formation takes place within the core of the galaxy and also in a filament feature that is 42 kiloparsecs long and it stretches from the core region towards southwest. An ionized nebula is found to surround the galaxy with the total estimated double ionized oxygen luminosity being 4.7 × 1043 erg s−1. There is a presence of filamentary structure located from north-east to south-west that is found either crossing or being associated with the emission originated from the central region of the galaxy. The north-east part of the filament is also shown to have an extension and orientated by 55°. The supermassive black hole in the center of RXC J1504.1−0248 BCG is estimated to be 2 × 109 M☉. Evidence also showed the black hole is also shown to be accreting at around 0.03 M☉ per year. A study published in 2007, has suggested the black hole has a mass of around 3 × 107 M☉ based on a silicon line width. Evidence also found the galaxy also contains molecular gas estimated to have a mass of 1.9 ± 0.1 × 1010 M☉ with around 80% of it being distributed in the region located within five kiloparsecs from the center. This region is also contains both a large clump feature and a smaller clump in the northeast direction. A long filament feature is found extending in southeast direction from the nucleus and contains around of 4.8 × 109 M☉ of the gas.

References

External links RXC J1504.1−0248 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with RXC J1504.1−0248 BCG

Start with the simplest possible case. Write down what RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG

In research: RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG 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: RXC J1504.1−0248 BCG is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1999, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RXC J1504.1−0248 BCG in simple terms?

Why does RXC J1504.1−0248 BCG 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 RXC J1504.1−0248 BCG?

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 RXC J1504.1−0248 BCG.