look-back time

look-back time

The time elapsed since a certain redshift.

look-back time

[′lu̇k ‚bak ‚tīm]
(astronomy)
The time in the past at which the light now being received from a distant object was emitted.
References in periodicals archive ?
First results on the look-back time star formation rate tomography of the Small Magellanic Cloud," (https://www.
But 83 years is a mere instant, of course, when contemplating the look-back times of celestial objects.
As the Benchmark Quote look-back time decreases, trades that occur outside of the Benchmark Quote are dropped from the analysis since under the Order Protection Rule, these trades would be re-routed to exchanges posting better prices.
The main effect of paragraph (200 ms longer look-back time for first than second paragraphs), F(1, 41) = 4.
It's not necessarily such a huge gain in look-back time, but 5 was thought of as one of the earliest epochs in which galaxies might form.
Most galaxies of interest to astronomers working on CANDELS have a look-back time of at least 10 billion years, when the universe was only a few billion years old.
GALEX can also image starburst galaxies (galaxies that are rapidly forming stars) out to redshifts of nearly 1, corresponding to a look-back time of roughly 6 billion years.
There are also links to some of the documents from Astronomical Formulas, including coordinate transformations, lunar phases, and cosmological look-back time.
The survey should yield a wealth of statistical information on galaxy types and the way the spectral characteristics of galaxies change with look-back time (and hence their state of evolution).
whether isolated galaxies found in voids are similar to those that aren't), pairs and compact groups versus isolated galaxies, modeling nature versus nurture, modeling and observations at different look-back times, and fossil groups.