Simulation of Soft X‐Ray Emission Lines from the Missing Baryons
Croft, Rupert A. C.
Sanders, Wilton T.
Weinberg, David H.
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CitationFang, Taotao, Rupert A. C. Croft, Wilton T. Sanders, John Houck, Romeel Dave, Neal Katz, David H. Weinberg, and Lars Hernquist. 2005. “Simulation of Soft X‐Ray Emission Lines from the Missing Baryons.” The Astrophysical Journal 623 (2): 612–26. https://doi.org/10.1086/428656.
AbstractWe study the soft X-ray emission (0.1-1 keV) from the warm-hot intergalactic medium (WHIM) in a hydrodynamic simulation of a cold dark matter universe. Our main goal is to investigate how such emission can be explored with a combination of imaging and spectroscopy and to motivate future X-ray missions. We first present high-resolution images of the X-ray emission in several energy bands in which emission from different ion species dominates. We pick three different areas to study the high-resolution spectra of X-rays from the WHIM: (1) a galaxy group, (2) a filament, and (3) an underluminous region. By taking into account the background X-ray emission from AGNs and foreground emission from the Galaxy, we compute composite X-ray spectra of the selected regions. We briefly investigate angular clustering of the soft X-ray emission, finding a strong signal. Most interestingly, the combination of high spectral resolution and angular information allows us to map the emission from the WHIM in three dimensions. We cross-correlate the positions of galaxies in the simulation with this redshift map of emission and detect the presence of six different ion species (Ne IX, Fe XVII, O VII, O VIII, N VII, and C VI) in the large-scale structure traced by the galaxies. Finally, we show how such emission can be detected and studied with future X-ray satellites, with particular attention to a proposed mission, the Missing Baryon Explorer (MBE). We present simulated observations of the WHIM gas with MBE.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41381818
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