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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Lyα emission from cosmic structure. I. Fluorescence
Astrophysical Journal, Volume 708, No. 2, Year 2010
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Description
We present predictions for the fluorescent Lyα emission signature arising from photoionized, optically thick structures in smoothed particle hydrodynamic cosmological simulations of a ΛCDM universe using a Monte Carlo Lyα radiative transfer code. We calculate the expected Lyα image and two-dimensional spectra for gas exposed to a uniform ultraviolet ionizing background as well as gas exposed additionally to the photoionizing radiation from a local quasar, after correcting for the self-shielding of hydrogen. As a test of our numerical methods and for application to current observations, we examine simplified analytic structures that are uniformly or anisotropically illuminated. We compare these results with recent observations. We discuss future observing campaigns on large telescopes and realistic strategies for detecting fluorescence owing to the ambient metagalactic ionization and in regions close to bright quasars. While it will take hundreds of hours on the current generation of telescopes to detect fluorescence caused by the ultraviolet background alone, our calculations suggest that on the order of 10 sources of quasar-induced fluorescent Lyα emission should be detectable after a 10 hr exposure in a 10 arcmin2 field around a bright quasar. These observations will help probe the physical conditions in the densest regions of the intergalactic medium as well as the temporal light curves and isotropy of quasar radiation. © 2010. The American Astronomical Society.
Authors & Co-Authors
Kollmeier, Juna A.
United States, Pasadena
Carnegie Observatories
Zheng, Zheng
United States, Princeton
Institute for Advanced Study
Dav́e, Romeel
United States, Tucson
The University of Arizona
Gould, Andrew P.
United States, Columbus
The Ohio State University
Katz, Neal S.
United States, Amherst
University of Massachusetts Amherst
Miralda-Escudé, Jordi
Spain, Barcelona
Institució Catalana de Recerca I Estudis Avançats
Spain, Barcelona
Universitat de Barcelona
Weinberg, David H.
United States, Columbus
The Ohio State University
Statistics
Citations: 102
Authors: 7
Affiliations: 7
Identifiers
Doi:
10.1088/0004-637X/708/2/1048
ISSN:
0004637X
Research Areas
Cancer
Environmental