astronomy

RX J1347.5−1145

RX J1347.5−1145 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 RX J1347.5−1145 rather than just read about it. In short: RX J1347.5–1145 is one of the most massive galaxy clusters known discovered in X-rays with ROSAT. As a result, it is also one of the most X-ray-luminous because of its hot gas content.

Key takeaways

RX J1347.5−1145 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect RX J1347.5−1145 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RX J1347.5−1145 from memory before moving on to harder problems.

Reference excerpt

RX J1347.5–1145 is one of the most massive galaxy clusters known discovered in X-rays with ROSAT. As a result, it is also one of the most X-ray-luminous because of its hot gas content. The object resides roughly 5 billion light-years away from the Solar System in the constellation of Virgo. Redshift was noted as z=0.451 with an X-ray luminosity of 1045 ergs s−1 in a paper from 2002. In 2013, one study found eight cases of the same object resulting from the intense gravitational bending of light, which makes it possible to identify a series of remote galaxies located inside the galaxy cluster with calculations from the photometric method between 5.5 and 7.5. That study made use of data from Cluster Lensing and Supernova survey with Hubble (CLASH) as well as other sources. The colors in the galaxy cluster are known to correspond with the level of brightness, or the number of electrons trapped in the examined wavelength range of the cluster, with the colors red, orange, and yellow as high intensity, blue-green and green as medium intensity, and blue and violet as low intensity. It is considered one of the brightest objects that is known by X-ray. The brightest galaxy inside RX J1347.5-1145 is the elliptical GALEX J134730.7-114509. The temperature along with the entropy maps show cool, entropic gases trailing the subcluster in a southwesterly direction, which is consistent with core shredding. The overall gas density, temperature, and metallicity are in good agreement with each other. The hot intracluster medium has an extension to the southeast along with a little indication of two cD galaxies located within the cluster.

Radio observations The first radio observations were taken in the years of 1999 and 2001 of the Sunyaev-Zeldovich effect located inside RX J1347.5-1145, along with the higher angular resolution (at approximately 150 GHz) which showed the stronger signal along with the enchantment, which is known to be located southeast of the cluster's center, the same location as the surface brightness extension viewed by X-Rays. Since the SZ intensity is proportional to the integrated gas pressure combined along with the light of sight, the strong SZ signal was interpreted due to too much hot gas in the cluster, which was probably caused by the merging of a subcluster along with the primary cluster. The presence of (kT ≥ 15 keV) gas in the southeast portion of the cluster has been cited, reported, and confirmed by Chandra.

X-Ray data analysis The galaxy cluster was observed for over 80 kiloseconds (~22 hours) over three Chandra X-ray Observatory observation windows, which the first two observations were in perspective by ACIS-S and the third one by ACIS-I. The glare projection was known to be done using the 2.5-7 keV and the 9.0-12 keV bands, which excluded the regions that were known to contain point sources and cluster emission. Proper estimation of the X-Ray background in the galaxy cluster is known to be critical for spectral arrays of faint, extended emission from the cluster, along with the use of the blank sky data sets from the Chandra calibration Database. Overall background normalization was used to measure the ratio of the count rate of high energy frequences (which is known to be around 9-12 keV).

References

External links RX J1347.5-1145 at Galaxy Clusters

Illustrations

Worked examples

Example 1 — a first encounter with RX J1347.5−1145

Start with the simplest possible case. Write down what RX J1347.5−1145 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 RX J1347.5−1145 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 RX J1347.5−1145 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 RX J1347.5−1145

In research: RX J1347.5−1145 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 RX J1347.5−1145 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: RX J1347.5−1145 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Galaxy clusters, ROSAT objects, Virgo (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for RX J1347.5−1145 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 RX J1347.5−1145 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RX J1347.5−1145 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 RX J1347.5−1145 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RX J1347.5−1145 in simple terms?

RX J1347.5–1145 is one of the most massive galaxy clusters known discovered in X-rays with ROSAT. As a result, it is also one of the most X-ray-luminous because of its hot gas content.

Why does RX J1347.5−1145 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 RX J1347.5−1145?

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 RX J1347.5−1145.