The Warm-Hot Intergalactic Medium: Past, Present and Bright Future

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In the first part of my talk, I will summarize the current evidence of the Warm-Hot Intergalactic Medium, showing Chandra and XMM-Newton detections of this important baryonic component of the local Universe, along four different lines of sight. I will then dedicate the second half of the talk to future prospects for WHIM studies. I will show spectral simulations performed with the baseline Constellation-X gratings and XEUS calorimeters, and will also present the science case and WHIM spectral simulations for a mid-size dedicated mission concept, called Pharos. Pharos will allow us to efficiently X-ray the intergalactic medium at very high spectral resolution (R > 3000) and in the soft X-ray band (0.08-1.5 keV), along hundreds of lines of sight, in less than 5 years, exploiting the large fluences of GRB X-ray rich afterglows. To reach this goal Pharos will need to start the high resolution observations within 30-60 seconds after the Gamma-Ray prompt emission, and will do this exploiting autonomous and automated onboard triggers from an integrated light (< 80 kg) 5-40 keV All Sky Monitor, based on the "SuperAgile" technology.

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