A search for molecular gas in a high-redshift radio galaxy

Ivison, R. J., Papadopoulos, P., Seaquist, E. R. and Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X 1996. A search for molecular gas in a high-redshift radio galaxy. Monthly Notices of the Royal Astronomical Society 278 (2) , pp. 669-672.

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Abstract

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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Oxford University Press
ISSN:	0035-8711
Related URLs:	http://adsabs.harvard.edu/abs/1996MNRAS....
Last Modified:	24 Oct 2022 11:37
URI:	https://orca.cardiff.ac.uk/id/eprint/48781

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