Measurement of the small-scale structure of the intergalactic medium using close quasar pairs

Rorai, Alberto; Hennawi, Joseph F.; Oñorbe, Jose; White, Martin; Prochaska, J. Xavier; Kulkarni, Girish; Walther, Michael; Lukić, Zarija; Lee, Khee-Gan

doi:10.1126/science.aaf9346

Title: Measurement of the small-scale structure of the intergalactic medium using close quasar pairs

Journal Article · Fri Apr 28 00:00:00 EDT 2017 · Science

DOI:https://doi.org/10.1126/science.aaf9346· OSTI ID:1441051

^[1]; Hennawi, Joseph F. ^[2];

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^[5];

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^[3]; Lukić, Zarija ^[6];

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Institute of Astronomy, Cambridge, UK., Max-Planck-Institut für Astronomie, Königstuhl, Germany.
Max-Planck-Institut für Astronomie, Königstuhl, Germany., Department of Physics, University of California, Santa Barbara, CA, USA.
Max-Planck-Institut für Astronomie, Königstuhl, Germany.
Department of Astronomy, University of California, Berkeley, CA, USA., Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
University of California Observatories–Lick Observatory, University of California, Santa Cruz, CA, USA.
Lawrence Berkeley National Laboratory, Berkeley, CA, USA.

Using quasar pairs to measure smoothness Space between galaxies is filled with a tenuous gas known as the intergalactic medium (IGM). The presence of hydrogen atoms in the IGM at different redshifts imprints a series of absorption lines in the spectra of background quasars. Rorai et al. studied pairs of closely spaced quasars and quantified how similar their absorption lines are as a function of transverse separation and redshift. They thus assessed the smoothness of the IGM on relatively small scales—several times the size of a galaxy. The results constrain interactions between galaxies and the IGM, such as heating by ultraviolet photons. Science , this issue p. 418

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; AST-1010004

OSTI ID:: 1441051

Alternate ID(s):: OSTI ID: 1393226

Journal Information:: Science, Journal Name: Science Vol. 356 Journal Issue: 6336; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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