----- Attempting Submission 1 (Thu Jul 03 17:20:00 GMT 2008) -----
Assigned ID: 700
----- Attempting Submission 1 (Fri Mar 07 23:00:11 GMT 2008) -----
Direct Observations of Dark Matter from a Second Bullet: The Spectacular Abell 2744
Vigorous cluster mergers provide a unique opportunity to directly "see" dark matter and to probe its properties through the analysis of the segregation of the baryonic and non-baryonic components. This is accomplished through detailed comparison of the mass distributions as traced by X-ray emitting gas and by gravitational lensing. This condition is rare and so far only one cluster has met these requirements, the so-called "bullet" cluster, producing exciting results and placing constraints to the properties of dark matter. These constraints have a broad impact on models for formation of structure and on galaxy evolution. This multi-wavelength analysis has the potential confront alternative gravity models such as MOND. Therefore, it is crucial to find new “bullet clusters” to corroborate and improve previous measurements. This is the most direct way to constrain dark matter properties and A2744 is ideal for corroborating this study since it maximizes all the requirements for this analysis. Here, we propose to carry out such analysis through combined ACS and Chandra observations of the cluster merger Abell 2744.
The proposed science will be achievable with 2 overlapping pointings, using a filter and depth distribution similar to that of
the GOODS survey: 3 F435W orbits, 2.5 F606W orbits and 2.5 F814W orbits
COSMOLOGY
12
false
0.0
0.0
false
false
false
false
false
SUPPORTED
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
HIGH REDSHIFT CLUSTER
RICH CLUSTER
This object was generated by the targetselector and retrieved from the NED database.
J2000
00 14 22.0770
-30 22 36.10
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
HIGH REDSHIFT CLUSTER
RICH CLUSTER
J2000
00 14 18.6180
-30 23 36.64
J2000
ACS/WFC
Imaging
No
No
F435W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F435W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
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