|Proposal Number||Subject Category||PI Name||Chandra Time||Title|
|07800936||CLUSTERS OF GALAXIES||Christopher Mullis||MEASURING THE PHYSICAL PROPERTIES OF THE MOST DISTANT X-RAY MASSIVE GALAXY CLUSTER AT z=1.4|
|07910358||GALACTIC DIFFUSE EMISSION AND SURVEYS||Leisa Townsley||Hot Plasma in W4: A Supernova-free Superbubble?|
Subject Category:CLUSTERS OF GALAXIES
Proposal Number: 07800936
Title:MEASURING THE PHYSICAL PROPERTIES OF THE MOST DISTANT X-RAY MASSIVE GALAXY CLUSTER AT z=1.4
PI Name: Christopher Mullis
We propose joint Chandra/XMM observations to measure the fundamental properties of XMMUJ2235.3-2557 (z=1.4), the most distant massive galaxy cluster known. Based on its high Lx, ICM temperature and optical/NIR richness, it is very likely the most massive z>1 structure yet identified. The cluster provides a compelling opportunity to extend the baseline of evolutionary studies to the largest look-back time currently accessible, and yields very strong leverage for testing cluster formation scenarios and for deriving cosmological constraints. Chandra's resolution is crucial to measure structural parameters free from point source confusion and to establish the cluster's dynamical state. XMM's high sensitivity is necessary to derive accurate measures of ICM temperature, metallicity and mass.
Subject Category:GALACTIC DIFFUSE EMISSION AND SURVEYS
Proposal Number: 07910358
Title:Hot Plasma in W4: A Supernova-free Superbubble?
PI Name: Leisa Townsley
This joint Chandra/XMM-Newton mosaic of the massive star-forming region Westerhout 4 (W4) in the Perseus Arm chronicles the X-ray output of all aspects of high-mass stars: wind shocks near the stellar surface, wind-wind and wind-cloud shocks on parsec scales, triggered star formation, superbubbles, and chimneys. This study focuses on the feedback of the W4 complex on the interstellar medium, where stellar winds from the massive young cluster IC 1805 are re-energizing the famous W4 superbubble that triggered star formation in the adjacent W3 giant molecular cloud. W4 is the best Galactic example of the superbubble phenomenon and provides direct evidence that massive stellar clusters have a profound influence on galactic halos.