We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:

Gas filaments of the cosmic web located around active galaxies in a protocluster.

Umehata, H. and Fumagalli, M. and Smail, I. and Matsuda, Y. and Swinbank, A. M. and Cantalupo, S. and Sykes, C. and Ivison, R. J. and Steidel, C. C. and Shapley, A. E. and Vernet, J. and Yamada, T. and Tamura, Y. and Kubo, M. and Nakanishi, K. and Kajisawa, M. and Hatsukade, B. and Kohno, K. (2019) 'Gas filaments of the cosmic web located around active galaxies in a protocluster.', Science., 366 (6461). pp. 97-100.


Cosmological simulations predict the Universe contains a network of intergalactic gas filaments, within which galaxies form and evolve. However, the faintness of any emission from these filaments has limited tests of this prediction. We report the detection of rest-frame ultraviolet Lyman-alpha radiation from multiple filaments extending more than one megaparsec between galaxies within the SSA 22 proto-cluster at a redshift of 3.1. Intense star formation and supermassive black-hole activity is occurring within the galaxies embedded in these structures, which are the likely sources of the elevated ionizing radiation powering the observed Lyman-alpha emission. Our observations map the gas in filamentary structures of the type thought to fuel the growth of galaxies and black holes in massive proto-clusters.

Item Type:Article
Full text:(AM) Accepted Manuscript
Download PDF
Publisher Web site:
Publisher statement:This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science, Volume 366 October 2019, DOI: 10.1126/science.aaw5949.
Date accepted:02 September 2019
Date deposited:16 October 2019
Date of first online publication:04 October 2019
Date first made open access:16 October 2019

Save or Share this output

Look up in GoogleScholar