Observations of a z~0.9 cluster of galaxies
Résumé
We present a multi-wavelength study on a z~0.9, Cl 1257+4738. The cluster Cl 1257+4738 was found by comparing a ROSAT image with red ground based images, taken to determine if the red galaxies were young dusty ones or old early type galaxies. This adds another cluster to the handful of clusters with z larger than about 0.9. Each one provides new insights as to the relationship between the evolution of galaxies and the ICM. We acquired Chandra, XMM-Newton, Spitzer IRAC plus MIPS 24 data to study this relationship between galaxies and the ICM. The Chandra plus Spitzer and ground-based data gave us the unique opportunity to find candidate galaxies and AGNs that could be at redshifts from 3 up to as high as 10.
Mots clés
clusters of galaxies
redshift
interstellar matter
galactic nuclei
brightness
98.65.Cw
98.62.Py
98.58.Ca
98.62.Js
98.62.Qz
Galaxy clusters
Distances redshifts radial velocities
spatial distribution of galaxies
Interstellar dust grains
diffuse emission
infrared cirrus
Galactic nuclei circumnuclear matter and bulges
Magnitudes and colors
luminosities