Extremely metal-poor gas at a redshift of 7

Robert A. Simcoe (), Peter W. Sullivan, Kathy L. Cooksey, Melodie M. Kao, Michael S. Matejek and Adam J. Burgasser
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Robert A. Simcoe: MIT-Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, Building 37, Room 664L, Cambridge, Massachusetts 02139, USA
Peter W. Sullivan: MIT-Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, Building 37, Room 664L, Cambridge, Massachusetts 02139, USA
Kathy L. Cooksey: MIT-Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, Building 37, Room 664L, Cambridge, Massachusetts 02139, USA
Melodie M. Kao: MIT-Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, Building 37, Room 664L, Cambridge, Massachusetts 02139, USA
Michael S. Matejek: MIT-Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, Building 37, Room 664L, Cambridge, Massachusetts 02139, USA
Adam J. Burgasser: Center for Astrophysics and Space Science, University of California San Diego, MC 0424, 9500 Gilman Drive, La Jolla, California 92093, USA

Nature, 2012, vol. 492, issue 7427, 79-82

Abstract: The spectrum of a quasar at redshift 7.04 reveals absorption from a large column of foreground neutral hydrogen with no corresponding heavy elements; this absorbing gas is either diffuse and intergalactic but has not yet been ionized by starlight at this early epoch, or it is gravitationally bound to a proto-galaxy that has a chemical abundance

Date: 2012
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DOI: 10.1038/nature11612

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