What specific signature of light is looked for as confirmation that a galaxy is still actively forming stars?
Answer
Blue light from young, hot, massive stars
Astronomers search for the distinct blue light emitted by young, hot, massive stars as the telltale signature of ongoing star formation; its absence confirms a quenched state.
Related Questions
What is the astrophysical term for the transition from a vibrant, blue, star-forming galaxy to a quiescent one?What is the primary ingredient required for star formation that, when exhausted or ejected, causes a galaxy to quench?What color classification is typically associated with quiescent or 'dead' galaxies?According to the provided data, what is the approximate minimum age a dead galaxy has been observed to possess post-Big Bang?What specific signature of light is looked for as confirmation that a galaxy is still actively forming stars?What capability of the James Webb Space Telescope (JWST) is essential for studying ancient, distant galaxies?What concept refers to a galactic structure where star birth processes have halted, leaving mostly older stars?How did the discovery of early quenched galaxies by JWST challenge previous theoretical models?If quenching occurs due to external forces preventing cold gas accumulation, what classification might this phenomenon fit under?What distinguished the record-breaking JWST discovery regarding an early quenched galaxy's age?What is the primary difference between a galaxy that is 'starved' versus one that is 'artificially quenched'?