Submission is late due to a personal/family situation. I would like to thank Beth and others at the STScI for your
understanding and patience.
----- Submission 1 (Mon May 23 09:22:48 GMT 2005) -----
Assigned ID: 277
----- Submission 1 (Fri Jan 21 18:22:22 GMT 2005) -----
Phase I Proposal 277 (cycle14_crab_polarization) successfully submitted.
Dynamics of the Polarization Structure of the Crab Nebula
The Crab Nebula is not a free expansion SNR. Rather, it is a pulsar wind nebula expanding from the inside out into a larger remnant of freely expanding ejecta. At the heart of this object is the Crab Pulsar and the region where the pulsar's highly nonisotropic wind interacts with the larger synchtron nebula. HST and Chandra monitoring has shown this to be one of the most intricately structured and highly dynamical objects ever observed. In Cycle 12 we demonstrated our ability to use the polarization capabilities of the ACS to isolate physically discrete features within the Crab Synchrotron Nebula and accurately measure their polarization characteristics. These data provide a unique look at the physical structure in the heart of the Crab, adding a new dimension to past observations. Polarization provides extensive information about field geometries, the degree of disorder in the field, and particle pitch angle distributions. But one image of the Crab is like a single image of waves at the beach. It necessarily misses the point. In the Crab, the name of the game is "dynamics". In this proposal we request time to monitor changes in the polarization structure of the Crab. This program will allow us to follow the changing polarization of features including relativistically moving wisps in the Crab Nebula. This is the only place in the sky where a dynamic relativistic plasma can be observed in sufficient detail to make such measurements possible, and the HST/ACS is the only instrument that we are likely to see in our careers capable of making the measurement. These observations will be an important addition to the already rich observational legacy of HST for what is arguably the most important single object in astrophysics.
The purpose of this proposal is to obtain polarization observations of the Crab synchrotron nebula on each of 12 visits spread as uniformly as possible through the Cycle 14 visibility window for the Crab. Each visit consists of 4 orbits. During the first orbit a CR-SPLIT observation is obtained with F550M, a relatively line-free continuum filter. This image gives us an image of the total intensity from the synchrotron nebula, with very little contamination from emission-line filaments. The next three orbits obtain CR-SPLIT F606W images crossed with POL0V, POL60V, and POL120V, respectively. The observations use the ACS/WFC. "WFC1-2K" is used with F550M, while "WFC" is used with F606W+POLXXV. It is our understanding that this should put the object at the same place on the detectors for all four exposures. The only special requirement is that the position and orientation be the same for each of the three polarizer images taken during each visit, since this greatly simplifies reconstruction of polarization information. The proposal specifies a visit every 9*N +/- 1 days from the date of the first visit. Exposure times were backed off to 2000 seconds per orbit to facilitate schedulability, but if possible better packing of orbits would be preferable.
ISM AND CIRCUMSTELLAR MATTER
12
false
0.0
false
false
false
false
false
SUPPORTED
ISM
SNR
J2000
05 34 32.1100
+22 01 6.80
J2000
ACS/WFC
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No
Yes
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ACS/WFC
Imaging
No
No
F550M
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No
Yes
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ACS/WFC
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No
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ACS/WFC
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No
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Yes
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ACS/WFC
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ACS/WFC
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No
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No
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Yes
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No
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ACS/WFC
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No
No
F550M
ACS/WFC
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No
Yes
F606W
ACS/WFC
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No
No
F550M
The intention of the pointing and aperture specification is to place the specified coordinates as close as possible to the geometrical center of the field of view of the ACS polarizers when used with the WFC.
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