Star-forming galaxies at very high redshifts
نویسندگان
چکیده
منابع مشابه
The Spatial Clustering of Star-forming Galaxies at Redshifts
We analyzed the spatial distribution of 28500 photometrically selected galaxies with magnitude 23.5 < RAB < 25.5 and redshift 1.4 < z < 3.5 in 21 fields with a total area of 0.81 square degrees. The galaxies were divided into three subsamples, with mean redshifts z̄ = 1.7, 2.2, 2.9, according to the UnGR selection criteria of Adelberger et al. (2004) and Steidel et al. (2003). Combining the gala...
متن کاملHubble Space Telescope Imaging of Star-forming Galaxies at Redshifts
We present Hubble Space Telescope images of star-forming galaxies at redshifts z > 3. These galaxies have been selected using ground–based images and color criteria sensitive to the presence of a Lyman discontinuity in the otherwise flat (in fν units) UV spectral energy distribution of unreddened star formation. The spectroscopic confirmation of these z > 3 galaxies is reported in a companion p...
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Magnetic fields in nearby galaxies are amplified and structured by compressing and shearing gas flows and by dynamo action. Large-scale coherent fields can be expected in young galaxies after several 10yr, while turbulent flows and small-scale dynamos can generate turbulent magnetic fields on the timescale of the first supernova explosions. Frequent interactions and ram pressure in the early Un...
متن کاملGalaxies at High Redshifts
Several conclusions have been reached over the last few years concerning high-redshift galaxies: (1) The excess of faint blue galaxies is due to dwarf galaxies. (2) Star formation peaks at redshifts z ≈ 1 − 2. (3) It appears to occur piecemeal in any given galaxy and there is no evidence for starbursting throughout a large ∼ 10 kpc galaxy. (4) There is significant and sharp diminution in the nu...
متن کاملMetals in Star-Forming Galaxies at High Redshift
The chemical composition of high-redshift galaxies is an important property that gives clues to their past history and future evolution. Measuring abundances in distant galaxies with current techniques is often a challenge, and the canonical metallicity indicators can often not be applied. I discuss currently available metallicity indicators based on stellar and interstellar absorption and emis...
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ژورنال
عنوان ژورنال: Nature
سال: 1996
ISSN: 0028-0836,1476-4687
DOI: 10.1038/381759a0