astronomy

SDSS J1001+5027

SDSS J1001+5027 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 J1001+5027 rather than just read about it. In short: SDSS J1001+5027 is a gravitationally lensed quasar located in the constellation of Ursa Major. The redshift of the object is (z) 1.841 and was discovered in March 2005 by Masamune Oguri during the Sloan Digital Sky Survey along with another lensed quasar, SDSS J120629.65+433217.6 (SDSS 1206+4332).

Key takeaways

SDSS J1001+5027 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 J1001+5027 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDSS J1001+5027 from memory before moving on to harder problems.

Reference excerpt

SDSS J1001+5027 is a gravitationally lensed quasar located in the constellation of Ursa Major. The redshift of the object is (z) 1.841 and was discovered in March 2005 by Masamune Oguri during the Sloan Digital Sky Survey along with another lensed quasar, SDSS J120629.65+433217.6 (SDSS 1206+4332).

Description SDSS J1001+5027 is described as a double imaged quasar. When imaged, the object is split into two components with a slightly large separation gap of 2.86 arcseconds and displaying a rich system of emission lines including cerium, triply ionized chromium and magnesium. The foreground lensing galaxy of SDSS J1001+5027 is estimated to lie at (z) 0.415 based on a study by Noahisa Inada published in 2012. A possible secondary lens galaxy and large galaxy density enhancement were also discovered, suggesting the contribution of the quasar's large image separation. The R-band light curve monitoring observations conducted for more than six years, found that SDSS J1001+5027 has evidence of time-delays but however proven uncertain. Based combining results from five different methods, the time-delay is said to be -119.3 ± 3.3 days, with component A leading component B. Amir Aghamousa would later give a new time-delay estimate of 117 days for the quasar, based on the application of a mirror estimator in his study, published in 2017. An official time-delay estimate of 120.93 ± 1.015 days was finally given for the quasar in 2023 by astronomers utilizing a TD-CARMA Bayesian technique. Additional information also showed, both of the components display strong variability; for instance component A had a large variability amplitude as high as 0.25 magnitude during observation periods conducted from 2006 to 2007. Optical data, also revealed both components underwent a steady decrease in brightness levels by around 0.2 magnitude during the first 200 days of observations with the Nordic Optical Telescope. Several other smaller variation features on short-scale, were shown on the curves in additional to both strong variability and decrease of brightness in the quasar. It is found SDSS J1001+507 is a broad absorption-line quasar. When observed with Subaru Telescope, the spectrum of both quasar components display absorption profiles, described as variable with a rotational velocity of 18,000 kilometer per seconds and at a radial distance of 0.06 parsecs through assumption of Keplerian motion. Six narrow-line absorption systems were found in addition, located at various redshifts between 0.41 and 1.75, with the magnesium system being the only one to display time variability and a velocity shear of 30 kilometers per seconds. The quasar shows outflowing wind and has a supermassive black hole mass of 9.66 ± 0.06 M☉ with a source continuum size of (2.2 ± 0.3) × 10−3 parsecs. An accretion disk size of 4.6+10.5-3.2 at rest frame of 1736Å via microlensing, has been calculated for the quasar.

References

External links NASA/IPAC database results for SDSS J1001+5027 SDSS J1001+5027 on SIMBAD SDSS J1001+5027 on Hyperleda

Illustrations

Worked examples

Example 1 — a first encounter with SDSS J1001+5027

Start with the simplest possible case. Write down what SDSS J1001+5027 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 J1001+5027 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 J1001+5027 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 J1001+5027

In research: SDSS J1001+5027 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 J1001+5027 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 J1001+5027 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2005, Gravitationally lensed quasars, Principal Galaxies Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for SDSS J1001+5027 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 J1001+5027 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDSS J1001+5027 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 J1001+5027 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SDSS J1001+5027 in simple terms?

Why does SDSS J1001+5027 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 J1001+5027?

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 J1001+5027.