astronomy

SDSS J1029+2623

SDSS J1029+2623 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 J1029+2623 rather than just read about it. In short: SDSS J1029+2623 is a gravitationally lensed radio-loud quasar located in the constellation of Leo. The redshift of the object is estimated to be (z) 2.212 and was first discovered by Naohisa Inada and Masamune Oguri in December 2006.

Key takeaways

SDSS J1029+2623 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 J1029+2623 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDSS J1029+2623 from memory before moving on to harder problems.

Reference excerpt

SDSS J1029+2623 is a gravitationally lensed radio-loud quasar located in the constellation of Leo. The redshift of the object is estimated to be (z) 2.212 and was first discovered by Naohisa Inada and Masamune Oguri in December 2006.

Description SDSS J1029+2623 is a double imaged quasar. It is separated into two components with a large angular separation of 22.5 arcseconds,making it the largest known separation lens. Like SDSS J1004+4112, it is lensed by a massive galaxy cluster located at (z) 0.588 with an Einstein radius of 15.2 ± 0.5 arcseconds and a bolometric luminosity of 9.6 × 1044 erg s−1, making it the second known quasar lensed by a cluster. Further observations discovered there is a third component in the lens system with its spectrum displaying emission and absorption features, however it has a redder continuum. Several lensed arcs are also identified in the system. In the field of SDSS J1029+2623, several galaxies are discovered at redshifts of 2.181, 3.027 and 5.062 based on spectroscopy data from the Large Area Telescope. A dark matter clump was discovered in a slight offset position from component B with a measured mass of 109 M☉. The quasar shows time-delays according to Janine Fohlmeister. Based on optical monitoring data obtained over 5.4 years, the time delay is estimated to be 744 ± 10 days with component A shown leading component B and component C. Fohlmeister suggested it displays weak evidence of microlensing, likely arising from a smaller galaxy responsible for its flux ratio anomaly. However an observation in 2020, confirmed no signs of microlensing but evidence of extinction. In combined light-curves, the intrinsic variability of SDSS J1029+2623 displays an amplitude at 100 days of 0.15 ± 0.03 magnitude with a power-law slope of 0.32 ± 0.02. Observations showed both of the components of SDSS J1029+2623 display narrow absorption-lines in their spectrum with ejection velocities of 1000 kilometers per seconds. According to results, there are 66 detected narrow absorption-lines of which 24 of them are classified as intrinsic. There are also broader proximity absorption lines (PALs) which are created in outflowing gas with measured electron densities of 8.7 × 103 cm−3 with multiple sightline observations suggesting they have larger sizes compared to sightline projection distances. SDSS J1029+2623 has outflowing wind originating from its accretion disk. When observed in mid-resolution spectroscopy, the carbon absorption-line profile shows no clear variation towards any lines of sight. It is also found to deblend into more than 10 narrow components, indicating it is related to the quasar. The absorption profiles of both A and B components remained constant since observations conducted in 2010, suggesting not time variability but differences along sightlines. It is suggested the outflow wind in SDSS J1029+2623 is confined to both a continuum source and a broad emission-line region measuring a size of 0.09 parsecs since the residual flux located at the bottom of absorption lines are closer to zero. The estimated supermassive black hole mass for SDSS J1029+2623 is 108.72 M☉.

References

External links SDSS J1029+2623 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with SDSS J1029+2623

Start with the simplest possible case. Write down what SDSS J1029+2623 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 J1029+2623 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 J1029+2623 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 J1029+2623

In research: SDSS J1029+2623 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 J1029+2623 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 J1029+2623 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2006, Gravitationally lensed quasars, Leo (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for SDSS J1029+2623 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 J1029+2623 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDSS J1029+2623 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.
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Frequently asked questions

What is SDSS J1029+2623 in simple terms?

Why does SDSS J1029+2623 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 J1029+2623?

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 J1029+2623.