Searching for molecular gas in a radio galaxy at redshift 3.8

Ivison, Robert J., Papadopoulos, Peter, Seaquist, Ernest R. and Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X 1996. Searching for molecular gas in a radio galaxy at redshift 3.8. Presented at: Cold Gas at High Redshift: A Workshop Celebrating the 25th Anniversary of the Westerbork Synthesis Radio Telescope, Hoogeveen, The Netherlands, 28–30 August 1995. Published in: Bremer, M. N., van der Werf, P. P., Röttgering, H. J. A. and Carilli, C. L. eds. Cold Gas at High Redshift: Proceedings of a Workshop Celebrating the 25th Anniversary of the Westerbork Synthesis Radio Telescope, held in Hoogeveen, The Netherlands, August 28–30, 1995. Cold Gas at High Redshift Proceedings of a Workshop Celebrating the 25th Anniversary of the Westerbork Synthesis Radio Telescope, held in Hoogeveen, The Netherlands, August 28–30, 1995. Astrophysics and Space Science Library (206) Dordrecht: Springer Netherlands, pp. 305-309. 10.1007/978-94-009-1726-2_35

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Abstract

There is reason to suspect that 4C 41.17, a radio galaxy at z = 3.8, contains a large quantity of enriched molecular gas. We have searched for CO in 4C 41.17, taking advantage of the fact that the J = 1-0 transition is redshifted into the K radio band for 3.80 < z < 4.25. There is no sign of CO line emission in our resulting spectrum (which covers 2000 km s-1, or 3.785 < z < 3.821), nor in the channel maps. Our limit for the integrated line intensity is SCOΔv < 0.17 Jy km s-1, for a line width of 500km s-1. Naively assuming a Galactic conversion factor gives M(H2) < 4 × 1011 M⊙, similar to the stellar mass of a present-day giant galaxy, and consistent with gas-to-dust ratios as high as 4400.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Springer Netherlands
ISBN:	9789400917262
Related URLs:	Publisher
Last Modified:	24 Oct 2022 11:35
URI:	https://orca.cardiff.ac.uk/id/eprint/48646

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