Publications by authors named "M Rafelski"
Massive disk galaxies like the Milky Way are expected to form at late times in traditional models of galaxy formation, but recent numerical simulations suggest that such galaxies could form as early as a billion years after the Big Bang through the accretion of cold material and mergers. Observationally, it has been difficult to identify disk galaxies in emission at high redshift in order to discern between competing models of galaxy formation. Here we report imaging, with a resolution of about 1.
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- Researchers have been studying gas around high-redshift galaxies by looking at absorption line systems related to background quasars, but identifying the faint galaxies linked to them has been challenging.
- Using the Atacama Large Millimeter/Submillimeter Array, the team successfully detected specific emissions from two galaxies connected to absorbers at a redshift of approximately 4.
- Their findings suggest that these galaxies, which have high metallicity, share characteristics with massive star-forming galaxies and are surrounded by extended reservoirs of enriched neutral hydrogen gas.
Of several dozen galaxies observed spectroscopically that are candidates for having a redshift (z) in excess of seven, only five have had their redshifts confirmed via Lyman α emission, at z = 7.008, 7.045, 7.
View Article and Find Full Text PDFEnergy dependence of particle multiplicities in central Au+Au collisions.
Phys Rev Lett
January 2002
We present the first measurement of the pseudorapidity density of primary charged particles in Au+Au collisions at root square[s(NN)] = 200 GeV. For the 6% most central collisions, we obtain dN(ch)/d(eta)/(/eta/<1) = 650+/-35(syst). Compared to collisions at root square[s(NN)] = 130 GeV, the highest energy studied previously, an increase by a factor of 1.
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