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OBSERVATIONAL STATUS
In accordance with NRAO's policy for data
access to large proposals, we make all of our data
publically
available within approximately eight weeks of observation. This
includes the final
polarized and
total intensity images, as well as the calibrated visibility
data. Below we summarize the status of our
individual observing epochs, each of which spans 24 hours.
The MOJAVE-I observations (BL111, BL123; 2002-2006) were optimized for obtaining suitably high-dynamic range, full-polarization images on a sample of 135 sources at reasonable intervals for measuring superluminal motion. We provide a full description of our observing and scheduling strategies, as well as a sample calibration pipeline script. The MOJAVE-II observations in 2006 (BL137A-L) followed the same strategy, but with an extended sample (192 sources), and polarimetric observations at 8.1, 8.4, 12.1 and 15.3 GHz. The scan lengths were chosen to achieve roughly the same image rms at each frequency. The MOJAVE-III (GLAST Era) observations of the extended sample, beginning in 2007 (BL137R and onwards) are carried out at 15.3 GHz only, with 25 AGN being observed in each 24 hour session. Beginning with BL149AC, observations are carried out with a 256 Mbps recording rate. For the purposes of polarization calibration, we maintain the following lists: 1. Sources that should NOT be used as
polarization leakage calibrators. The polarization structure
of these sources is either too complex for the linearized D-term model
(LPCAL) or their structure is not sufficiently core-dominated.
2. Sources that are good EVPA calibrators. These highly core-dominated sources show consistently good correspondence between the integrated VLBA EVPA and near-simultaneous EVPA measurements at the U. Michigan radio observatory. In the table below, the "AN Table" column has links to the AN table at each epoch containing the leakage term corrections. Note that these are uncorrected for the instrumental EVPA offset. The amount of EVPA rotation required in degrees at the appropriate reference antenna is indicated. We provide a PERL script that rotates and plots these leakage terms.
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