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The optical spectra of the quasars presented a new mystery. Photographs taken of their spectra showed locations for emission lines at wavelengths that were at odds with all celestial sources then familiar to astronomers.
The puzzle was solved by the Dutch American astronomer Maarten Schmidt , who in recognized that the pattern of emission lines in 3C , the brightest known quasar, could be understood as coming from hydrogen atom s that had a redshift i.
In other words, the wavelength of each line was 1. This was a large, though not unprecedented, distance bright clusters of galaxies had been identified at similar distances , but 3C is about times more luminous than the brightest individual galaxies in those clusters, and nothing so bright had been seen so far away.
An even bigger surprise was that continuing observations of quasars revealed that their brightness can vary significantly on timescales as short as a few days, meaning that the total size of the quasar cannot be more than a few light-days across.
Since the quasar is so compact and so luminous, the radiation pressure inside the quasar must be huge; indeed, the only way a quasar can keep from blowing itself up with its own radiation is if it is very massive, at least a million solar masses if it is not to exceed the Eddington limit —the minimum mass at which the outward radiation pressure is balanced by the inward pull of gravity named after English astronomer Arthur Eddington.
Astronomers were faced with a conundrum: how could an object about the size of the solar system have a mass of about a million stars and outshine by times a galaxy of a hundred billion stars?
The combination of high luminosities and small sizes was sufficiently unpalatable to some astronomers that alternative explanations were posited that did not require the quasars to be at the large distances implied by their redshifts.
These alternative interpretations have been discredited, although a few adherents remain. For most astronomers, the redshift controversy was settled definitively in the early s when American astronomer Todd Boroson and Canadian American astronomer John Beverly Oke showed that the fuzzy halos surrounding some quasars are actually starlight from the galaxy hosting the quasar and that these galaxies are at high redshifts.
By it was recognized that quasars are part of a much larger population of unusually blue sources and that most of these are much weaker radio sources too faint to have been detected in the early radio surveys.
Seyfert, who first identified them in Article Media. Info Print Print. Table Of Contents. Submit Feedback. Except with our express permission, you are not allowed to upload, post, publish, reproduce, transmit, distribute or modify in any way any component of the Website itself or create derivative works with respect thereto, as the Website is protected by applicable intellectual property laws.
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