TY - JOUR
T1 - The giant protogalaxy cB58
T2 - An artefact of gravitational lensing?
AU - Williams, L. L.R.
AU - Lewis, G. F.
PY - 1996
Y1 - 1996
N2 - The protogalaxy cB58 was discovered in the Canadian Network of Observational Cosmology (CNOC) survey of cluster redshifts. Absorption features reveal that this system is at a redshift of z = 2.72, implying an absolute magnitude of Mv∼ -26, and has a star formation rate of 4700 M⊙ yr-1, making it the most 'active' star-forming galaxy. This protogalaxy is observed to lie close (∼ 6 arcsec) to a central cluster galaxy at z = 0.373. The X-ray properties of the cluster suggest that its mass, and therefore its lensing potential, could be greater than that found using a virial analysis. In this Letter we argue that the phenomenal properties of this protogalaxy are due to the gravitational lensing effect of the foreground cluster, and the unlensed properties of the source are typical of high-redshift star-forming systems.
AB - The protogalaxy cB58 was discovered in the Canadian Network of Observational Cosmology (CNOC) survey of cluster redshifts. Absorption features reveal that this system is at a redshift of z = 2.72, implying an absolute magnitude of Mv∼ -26, and has a star formation rate of 4700 M⊙ yr-1, making it the most 'active' star-forming galaxy. This protogalaxy is observed to lie close (∼ 6 arcsec) to a central cluster galaxy at z = 0.373. The X-ray properties of the cluster suggest that its mass, and therefore its lensing potential, could be greater than that found using a virial analysis. In this Letter we argue that the phenomenal properties of this protogalaxy are due to the gravitational lensing effect of the foreground cluster, and the unlensed properties of the source are typical of high-redshift star-forming systems.
KW - Galaxies: clusters: general
KW - Galaxies: fundamental parameters
KW - Gravitational lensing
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U2 - 10.1093/mnras/281.3.L35
DO - 10.1093/mnras/281.3.L35
M3 - Article
AN - SCOPUS:1542504734
SN - 0035-8711
VL - 281
SP - L35-L39
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -