IRS Spectroscopy and MIPS Mapping of the Intracluster Medium in the Bullet Cluster 1E0657-56

Details IRS Spectroscopy and MIPS Mapping of the Intracluster Medium in the Bullet Cluster 1E0657-56 IRS Spectroscopy and MIPS Mapping of the Intracluster Medium in the Bullet Cluster 1E0657-56

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40137a&link_type=abstract

Spitzer Proposal ID #40137

Physics

Scientific paper

We propose deep IRS and MIPS observations of the powerful X-ray cluster 1E0657-56 to map the distribution and properties of a likely cool intra-cluster medium associated with the Bullet-like collision of a dark-matter/galaxy sub-clump with the main cluster. Observations of 1E0657-56 (at z = 0.3) have been interpreted as conclusive evidence that dark-matter associated with the sub-clump interacts much more weakly with the cluster than the baryonic material in the clump. Weak-lensing tomography shows the dark-matter (and associated galaxies) lie ahead of a dissipative bow-shock structure seen in the X-ray-emitting gas mapped recently by Chandra. Our proposal will test this hypothesis further by studying the thermally important shock-coolants (large dust grains and molecules) which we predict should be associated with the shocked X-ray gas lagging the clump, and which is best detected in the mid and far-IR. We exploit the large angular scale of the IRS low-res slits to perform deep observations of 1E0657-56 to search for powerful emission from dust and molecular gas which we expect to be important in such shocks spread over several tens of arcsecs: the scale of the X-ray shock and filaments seen by Chandra. The recent discovery of ultra-powerful (L > 6 x 1042 ergs/s) H2 emission in the cluster Zwicky 3146 at a similar redshift to 1E0657-56 provides strong support for the feasibility of this project. Our MIPS imaging of the entire cluster will also test the idea that the dark matter/gaseous separation might affect the process of accretion onto the most massive cluster galaxies: a process that seems common in dynamically relaxed systems.

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