EUV and X-ray observation of Abell 2199: a three-phase intracluster medium with a massive warm component
| dc.creator | Lieu, Richard | |
| dc.creator | Bonamente, Massimiliano | |
| dc.creator | Mittaz, Jonathan P. D. | |
| dc.date | 2000-01-08 | |
| dc.date.accessioned | 2026-07-07T01:51:37Z | |
| dc.date.available | 2026-07-07T01:51:37Z | |
| dc.description | Various independent ways of constraining the Hubble constant and the baryonic content of the universe finally converged at a consensus range of values which indicates that at the present epoch the bulk of the universe's baryons is in the form of a warm $\sim$ 10$^6$ K gas - a temperature regime which renders them difficult to detect. The discovery of EUV and soft X-ray excess emission from clusters of galaxies was originally interpreted as the first direct evidence for the large scale presence of such a warm component. We present results from an EUVE Deep Survey (DS) observation of the rich cluster Abell 2199 in the Lex/B (69 - 190 eV) filter passband. The soft excess radial trend (SERT), shown by a plot against cluster radius $r$ of the percentage EUV emission $η$ observed above the level expected from the hot intracluster medium (ICM), reveals that $η$ is a simple function of $r$ which decreases monotonically towards $r = 0$; it smoothly turns negative at $r \sim$ 6 arcmin, inwards of this radius the EUV is absorbed by cold matter with a line-of-sight column density of $\geq$ 2.7 $\times$ 10$^{19}$ cm$^{-2}$. The area of absorption is much larger than that of the cooling flow. These facts together provide strong evidence for a centrally concentrated but cluster-wide distribution of clumps of cold gas which co-exist with warm gas of similar spatial properties. Further, the simultaneous modeling of EUV and X-ray data requires a warm component even within the region of absorption. The phenomenon demonstrates a three phase ICM, with the warm phase estimated to be $\sim$ 5-10 times more massive than the hot. | |
| dc.description | To be presented at the Atlanta AAS meeting | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0001127 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0001127 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/354 | |
| dc.subject | Astrophysics | |
| dc.title | EUV and X-ray observation of Abell 2199: a three-phase intracluster medium with a massive warm component | |
| dc.type | text |