The Intracluster Medium at z > 1

Details The Intracluster Medium at z > 1 The Intracluster Medium at z > 1

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19712403h&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #124.03; Bulletin of the American Astronomical Society, Vol. 32, p.1609

Other

Scientific paper

Using the Chandra X-ray Observatory, we have observed some of the highest redshift clusters in the ROSAT Deep Cluster Survey. We use these X-ray observations to study the intracluster medium in two clusters at a redshift of z ~ 1.27. Using these data, we measure fluxes, temperatures and compare the distribution of the X-ray emitting gas with the underlying galaxy population. First, we examined the spatial distribution of these two clusters. One has quite regular X-ray isophotes, so we fit an isothermal β model to constrain the mass of X-ray emitting gas. We find, with a value of β = 0.61 and a compact core radius of rc = 65 kpc (Ho = 65 km s-1 Mpc-1, Ω m = 0.3, Ω Λ = 0.7) a gas mass of 2.3x 1013 Msun(<1 Mpc). The second cluster has a much more irregular morphology, with no central concentration. For both clusters, we used the spatial distribution of X-ray events to define apertures for measuring the fluxes and temperatures of the clusters. The irregular cluster is quite faint, ~ 120 events inside a 30 arcsecond aperture. For that cluster, we find a temperature of ~ 1.6 keV but with large uncertainties. The more regular cluster has a temperature of ~ 7.0 keV, but a luminosity of only 1.3x 1044 erg s-1 (0.7--10.0 keV, rest frame) based on 450 events within a 36 arcsecond aperture. Both clusters lie slightly to the right of the low redshift luminosity-temperature relation, in contradiction with the expectation from Ω m = 1 intracluster medium evolution models. However, for both clusters, the intracluster medium is well correlated with the galaxy population which is apparently dominated by older stellar populations, a tantalizing clue for the formation of the intracluster medium.

Affiliated with

Also associated with

No associations

Rating

The Intracluster Medium at z > 1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Intracluster Medium at z > 1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Intracluster Medium at z > 1 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1728856