Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387l..29m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 387, March 1, 1992, p. L29-L32.
Astronomy and Astrophysics
Astrophysics
39
H Alpha Line, Lyman Alpha Radiation, Radio Galaxies, Red Shift, Astronomical Spectroscopy, Emission Spectra, Interstellar Extinction, Signal To Noise Ratios
Scientific paper
The first spectroscopic detection of H-alpha emission from radio galaxies at z greater than 2 are presented. Strong H-alpha emission is detected at z = 2.429 in B3 0731 + 438, and H-alpha is directed at z = 2.428 in 0406 - 244 at a significant level of greater than 6 sigma. The resulting Ly-alpha/H-alpha ratios for 0731 + 438 and 0406 - 244 are 3.9 and 3.2 with 3 sigma uncertainties of 1.5 for each. A range of possible extinctions is derived depending on the reddening-free Ly-alpha/H-alpha ratio assumed and the extinction curve employed. The most important result of this study is the demonstration that the Ly-alpha/H-alpha ratio in distant galaxies can now be measured with relative ease.
Eisenhardt Peter
Elston Richard
McCarthy Patrick. J.
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