X-Ray Emission from the Warm Hot Intergalactic Medium
| dc.creator | Ursino, E. | |
| dc.creator | Galeazzi, M. | |
| dc.date | 2006-04-07 | |
| dc.date | 2006-04-10 | |
| dc.date.accessioned | 2026-07-07T11:04:00Z | |
| dc.date.available | 2026-07-07T11:04:00Z | |
| dc.description | The number of detected baryons in the Universe at z<0.5 is much smaller than predicted by standard big bang nucleosynthesis and by the detailed observation of the Lyman alpha forest at red-shift z=2. Hydrodynamical simulations indicate that a large fraction of the baryons today is expected to be in a ``warm-hot'' (10^5-10^7K) filamentary gas, distributed in the intergalactic medium. This gas, if it exists, should be observable only in the soft X-ray and UV bands. Using the predictions of a particular hydrodynamic model, we simulated the expected X-ray flux as a function of energy in the 0.1-2 keV band due to the Warm-Hot Intergalactic Medium (WHIM), and compared it with the flux from local and high red-shift diffuse components. Our results show that as much as 20% of the total diffuse X-ray background (DXB) in the energy range 0.37-0.925keV could be due to X-ray flux from the WHIM, 70% of which comes from filaments at redshift z between 0.1 and 0.6. Simulations done using a FOV of 3', comparable with that of Suzaku and Constellation-X, show that in more than 20% of the observations we expect the WHIM flux to contribute to more than 20% of the DXB. These simulations also show that in about 10% of all the observations a single bright filament in the FOV accounts, alone, for more than 20% of the DXB flux. Red-shifted oxygen lines should be clearly visible in these observations. | |
| dc.description | 19 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0604175 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0604175 | |
| dc.identifier | Astrophys.J.652:1085-1089,2006 | |
| dc.identifier | doi:10.1086/507265 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/188741 | |
| dc.subject | Astrophysics | |
| dc.title | X-Ray Emission from the Warm Hot Intergalactic Medium | |
| dc.type | text |