| PROPOSAL OVERVIEW | |
| Proposal Title | Stacking the X-ray Line Forest: Detecting the Missing Baryons |
| Proposal Category | Galaxies, Groups of Galaxies, Clusters of Galaxies and Superclusters |
| Proposal Type | UNDEFINED |
| Proposal Id | 088265 |
| Number of Observations | 5 |
| Total exposure time (ks) | 535 |
| PI DETAILS | |
| PI | Dr Akos Bogdan |
| Institute | Smithsonian Astrophysical Obs |
| Country | UNITED STATES |
| CO-INVESTIGATORS | ||
| Name | Country | |
| R. Smith | UNITED STATES | |
| O. Kovacs | HUNGARY | |
| W. Forman | UNITED STATES | |
| R. Kraft | UNITED STATES | |
| ABSTRACT | |
| In the low-redshift universe, a fraction of the baryons remains unaccounted for on the largest scales and on the galaxy scales, which define the global and local missing baryon problems. A promising approach to resolve these problems is to probe X-ray absorption lines imprinted on the spectrum of background quasars. By utilizing our novel stacking method, we detected an OVII absorption line in the spectrum of PKS0405-123. We propose deep XMM-Newton observations that will boost the stacked exposure time to 10.4 Ms, allowing us to probe the absorption lines to unprecedented depths. We will demonstrate the robust nature of the detection, increase its significance to >5sigma, and build an accurate gas density profile, thereby addressing the global and the local missing baryon problems. | |
| PAPERS |
| - CLASS 1: | papers that present specific XMM-Newton observations |
| - CLASS 2: | papers that refer to published XMM-Newton results with complementary observations, follow-up analysis, or theoretical analysis |
| - CLASS 3: | further deliveries which resulted from the program and which are made available to the community (e.g. source catalogues, processed images or spectra in public data base) |
| - CLASS 4: | comments and suggestions from PI |