astronomy

SDSS J131642.90+175332.5

SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5 rather than just read about it. In short: SDSS J131642.90+175332.5 known as J1316+1753 or J1316+17, is an emission line galaxy with an active galactic nucleus, located in the constellation of Coma Berenices. At the redshift of z = 0.15, the object is located 2.18 billion light years from Earth.

Key takeaways

SDSS J131642.90+175332.5 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SDSS J131642.90+175332.5 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDSS J131642.90+175332.5 from memory before moving on to harder problems.

Reference excerpt

SDSS J131642.90+175332.5 known as J1316+1753 or J1316+17, is an emission line galaxy with an active galactic nucleus, located in the constellation of Coma Berenices. At the redshift of z = 0.15, the object is located 2.18 billion light years from Earth. It is considered remarkable because unlike other galaxies, SDSS J131642.90+175332.5 shows all double-peaked narrow emission lines including an extra large component.

Characteristics SDSS J131642.90+175332.5 is classified a spiral galaxy with two prominent spiral arms, based on an optical continuum image from Multi-unit spectroscopic explorer (MUSE) data, with smaller galaxy companions located within its position. The galaxy has a luminosity of L[OIII] = 1042.8 erg s−1 according to a QfeedS sample of bright sources. The star formation rate of SDSS J131642.90+175332.5 is estimated to be 30 ± 10 M☉ yr−1 with a stellar mass of 1011 M☉ according to a spectral energy distribution fitting observed in ultraviolet to far-infrared radiation, making it a star-forming galaxy. It is also a bright type-2 quasar. The radio luminosity for SDSS J131642.90+175332.5 is L1.4GHz = 1023.8 W Hz−1. Although the galaxy harbors a radio active galactic nucleus, it is found to be radio-quiet based on a study made by Xu in 1999. SDSS J131642.90+175332.5 has a complex radio morphology. It contains three components, consisting of a radio core and two hotspots linked by the galaxy's low-powered radio jets (Pjet ~ 1044 erg s−1). Both hotspots have estimated distances of 0.91 and 1.40 kiloparsecs, while the radio core has a 1.5-7 GHz spectral index.

Jet-induced feedback SDSS J131642.90+175332.5 has signs of jet-induced feedback caused by the inclination of its radio jets into the plane of the disc. At the jet hotspot positions, two ionized gas components are separated by 441 kilometers (km) s−1 which appears moving away from the jets. Beyond a brighter radio hotspot, molecular gas velocity is seen switching with possible hints of carbon oxide emitted gas. Evidence also points out, the ionized gas is travelling in perpendicular motion to its disk at a distance of 7.5 kpc from its nucleus, with a velocity-dispersion of W80 ≈ 1000 -1300 km s−1. The stellar bulge's position angle is seen closely aligned together with the radio-jet axis. This three clues strong hints the jets in SDSS J131642.90+175332.5 are interacting with the interstellar medium.

Emission lines SDSS J131642.90+175332.5 displays many emission lines. They exhibit all double-peaked profiles in which for each of the double peaks, the low redshift systems are known to be "blue systems", whereas the high redshift systems are "red systems". The blue systems are located at redshift of 0.1491 while the red systems have a redshift of 0.1510. Both have a full width at half maximum (FHWM) of 140 km s−1 and 480 km s−1 respectively, with a velocity separation of ~ 500 km s−1. Additionally, an underlying extra component is seen between both red and blue systems. It has a FHWM of 1400 km s−1. According to integral field observations, a very large doubly ionized oxygen emission-line profile (W80 ≈ 1100 - 1200 km s−1) is discovered. It has a projected expansion of over ≥ 14 kpc. Looking at its velocity profile, the emission line flux ratio log is shown lessening with a projected break radius (Rbr = 5 kpc). Based on the annulus of the break radius, a Hβ surface brightness (ΣHβ = 6.2 x 10−16 erg s−1 arcsec−2) is calculated for the emission-line profile.

References

External links

SDSS J131642.90+175332.5 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with SDSS J131642.90+175332.5

Start with the simplest possible case. Write down what SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5

In research: SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5 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: SDSS J131642.90+175332.5 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Coma Berenices, LEDA objects, so understanding it makes those chapters shorter.
In everyday life: Look for SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SDSS J131642.90+175332.5 in simple terms?

Why does SDSS J131642.90+175332.5 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 SDSS J131642.90+175332.5?

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 SDSS J131642.90+175332.5.