A median redshift of 2.4 for galaxies bright at submillimetre wavelengths
Abstract
A significant fraction of the energy emitted in the early Universe came from very luminous galaxies that are largely hidden at optical wavelengths (because of interstellar dust grains); this energy now forms part of the cosmic background radiation at wavelengths near 1 mm (ref. 1). Some submillimetre (submm) galaxies have been resolved from the background radiation, but they have been difficult to study because of instrumental limitations. This has impeded the determination of their redshifts (z), which is a crucial element in understanding their nature and evolution. Here we report spectroscopic redshifts for ten submm galaxies that were identified using high-resolution radio observations. The median redshift for our sample is 2.4, with a quartile range of 1.9–2.8. This population therefore coexists with the peak activity of quasars, suggesting a close relationship between the growth of massive black holes and luminous dusty galaxies. The space density of submm galaxies at redshifts over 2 is about 1,000 times greater than that of similarly luminous galaxies in the present-day Universe, so they represent an important component of star formation at high redshifts.
Additional Information
© 2003 Nature Publishing Group. Received 1 July 2002; accepted 17 February 2003. We thank C. Steidel, A. Shapley and T. Heckman for discussions. S.C.C. acknowledges support from NASA. I.R.S. acknowledges support from the Royal Society and a Philip Leverhulme Prize Fellowship. NRAO is operated by Associated Universities Inc., under a cooperative agreement with the US National Science Foundation. Data presented herein were obtained using the W. M. Keck Observatory, which is operated as a scientific partnership among Caltech, the University of California and NASA. The Observatory was made possible by the financial support of the W. M. Keck Foundation.Attached Files
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Additional details
- Eprint ID
- 56109
- Resolver ID
- CaltechAUTHORS:20150326-090532312
- NASA
- Royal Society
- Leverhulme Trust
- W. M. Keck Foundation
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2015-03-26Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field