Cold Gas at High Redshift: Proceedings of a Workshop by Colin A. Norman, Robert Braun (auth.), M. N. Bremer, P. P.

By Colin A. Norman, Robert Braun (auth.), M. N. Bremer, P. P. van der Werf, H. J. A. Röttgering, C. L. Carilli (eds.)

Recent years have obvious expanding facts that the most epoch of galaxy formation within the universe should be without delay available to statement. An­ gular fluctuations within the historical past relict radiation were detected by way of a number of ground-based tools in addition to by means of the COBE satellite tv for pc, and recommend that the epoch of galaxy formation was once now not so very early. mixed optical and radio reports have came across galaxies at redshifts above 2. zero, platforms that no less than superficially exhibit the features anticipated of enormous galaxies obvious in basic terms presently after their formation. And absorption traces within the spectra of quasars appear to be telling us that almost all chilly fuel at early to intermediate cosmological epochs used to be in clouds having approximately galaxy sized lots. What types of new observations will top aid us research this excessive redshift universe in destiny? What new tools should be wanted? those are questions that loom huge within the minds of the Dutch astronom­ ical group as we rejoice 25 years of operation of the Westerbork Synthesis Radio Telescope. party of this Silver Jubilee has incorporated a party (on 23 June, 1995), a commemorative quantity either the heritage and the way forward for the ability ("The Westerbork Observa­ tory, carrying on with event in Radio Astronomy," Kluwer 1996), and a global workshop, held within the village of Hoogeveen on 28-30 August, 1995.

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In order to obtain more information about the physical conditions of the molecular gas in these galaxies we have performed observations of the CO(a-2) and CO(2-1) emission. Furthermore, we observed the submillimeter continuum at several wavelengths, which, together with the IRAS fluxes, allows the dust temperature and mass to be derived. 2. Observations The observations were carried out in June 1994 using the 15-m James Clerk Maxwell Telescope (JCMT) on Mauna Kea, Hawaii. , 1995). For the CO observations, single-channel SIS receivers [Receiver A2 for CO(2-1), Receiver B3 for CO(3-2)] were used together with the DAS backend spectrometer.

Mdyn) often exceed 50% (as compared with typical values of 5% near the centers of normal galaxies). Recently, several of these galaxies have been observed at 2" resolution in CO (1-0) and at I" resolution in the CO (2-1) transition. We describe three of these objects (VV 114, Mrk 231, and Arp 220) in more detail below. 1. VV 114 VV 114 is an early merger system with LJR = 6 X 1011 Le;) and a very large gas content, MH2 = 5 X 10 10 Me;). The two galaxy nuclei are seperated by 6 kpc, and CO (1-0) images show the molecular peak between the optical and infrared nuclei (Yun, Scoville, & Knop 1994).

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