Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..669i&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. Vol. 278, No. 2, p. 669 - 672
Astronomy and Astrophysics
Astronomy
10
Galaxies: Individual: 4C 41.17 -- Galaxies: Ism -- Cosmology: Observations-- Radio Continuum: Galaxies, Radio Galaxies: Radio Maps, Radio Galaxies: Radio Spectra, Radio Galaxies: Molecules
Scientific paper
There is reason to suspect that 4C 41.17, a radiogalaxy at z = 3.800±0.003, contains a large quantity of enriched molecular gas. The authors describe a search for CO in 4C 41.17, taking advantage of the fact that the J = 1→0 rotational transition is redshifted into the radio-frequency band centred at 23 GHz for 3.80 < z < 4.25. There is no sign of CO line emission in the authors' resulting spectrum, which covers 2000 km s-1 (or 3.785 < z < 3.821), nor in the 78-km s-1 wide channel maps. The authors' upper limit for the integrated line intensity is SL < 0.17 Jy km s-1, for a linewidth of 500 km s-1. Naively assuming a Galactic conversion factor, this places a limit of around 4×1011Msun on the mass of molecular hydrogen, which is similar to the stellar mass of a present-day giant galaxy, and consistent with gas-to-dust ratios as high as 4400.
Eales Stephen A.
Ivison Rob J.
Papadopoulos Philippos
Seaquist Ernest R.
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