Abstract
NEAR the position of the radio source 4C11.50, Wampler et al.1 have found a pair of QSOs separated by 4.8 arc s, with redshifts of 0.4359 and 1.901, respectively. Hazard et al.2 have noted the presence of a 19-mag galaxy, 10 arc s west of the brighter, lower redshift QSO (4C11.50a); a plate obtained with the 224-cm telescope at Mauna Kea shows that this ‘galaxy’ is actually a close group of three galaxies. Several spectrograms have been obtained at 190 and 50 Å mm−1, with the two brighter galaxies aligned along the slit at position angle 33°. There is a continuum break downwards to the blue at about 5,700 Å, and an emission line at 5,344.9 Å these features can be identified with the long wavelength edge of the H and K lines, and with the [O II] λ3,727 doublet, respectively. Assuming an average wavelength of 3,727.4 Å for the [O II] doublet, the redshift is 0.4340 (not corrected for galactic rotation). The two galaxies on the slit are separated by about 2.5 arc s and are not well resolved on the spectrogram, so it is not certain to which one the redshift refers.
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References
Wampler, E. J., Baldwin, J. A., Burke, W. L., Robinson, L. B., and Hazard, C., Nature, 246, 203–205 (1973).
Hazard, C., Jauncey, D. L., Sargent, W. L. W., Baldwin, J. A., and Wampler, E. J., Nature, 246, 205–208 (1973).
Burbidge, G. R., Nature phys. Sci., 246, 17–25 (1973).
Gunn, J. E., Astrophys. J. Lett., 164, L113–L118 (1971).
Robinson, L. B., and Wampler, E. J., Astrophys. J. Lett., 171, L83–L86 (1972).
Stockton, A., Nature phys. Sci., 246, 25 (1973).
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STOCKTON, A. Redshift of a galaxy near 4C11.50. Nature 250, 308 (1974). https://doi.org/10.1038/250308a0
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DOI: https://doi.org/10.1038/250308a0
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