Summary
 

Observation code	:	vs01a		AIPS Version	:	15APR99
Date of Observation	:	1997/354		Difmap Version	:	2.3c
Source Name	:	M87		vsop_difmap used	:	Yes
Calibration Source(s)	:
Ground telescopes	:	BR-MK,PT,SC		Model Fitted to data	:	Yes
Tracking Station(s)	:	NZ,RZ		Image made	:	Yes
Correlator	:	Socorro

 

Abstract This survey dataset is an extraction of the GOT experiment v081b. The extraction was received on tape from Socorro containing data for five GRTs plus HALCA. All but 3 GRTs at any one time were flagged before imaging in Difmap. BR,PT,SC are used during the RZ tracking pass, and MK,PT,SC during the NZ tracking pass. In order to find weak HALCA fringes, the ground telescopes were fringed first. These solutions were applied and the resulting data was averaged in frequency and time using SPLAT. This helped increase the SNR for the weak HALCA fringes. Because of this, the GRTs in the final fringe plots have zero delays and rates, and there are two TASAV files: the final version and the tables as they were before SPLAT was applied. Suggested parameters for all AIPS tasks were used. CALIB was not run so the final SN and CL tables have non-zero phases in them. Imaging and model-fitting both went very well and produced good results.

Model
Flux (Jy)	Radius (mas)	Theta (deg)	Major (mas)	Axial ratio	Phi (deg)	TB (10^12 K)
0.164844	0.666251	91.7064	0.410604	1.00000	-21.8014	0.0477
0.453460	0.311647	20.5205	0.545123	1.00000	-45.0000	0.0745
0.359487	0.800635	-85.4254	0.712312	1.00000	-19.2901	0.0346
0.159505	1.59666	-86.5193	0.457189	1.00000	-15.9454	0.0372
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.

AIPS Input Files

UVFLG.TXT ANTAB.TXT

Comments - None -

AIPS Output Files

PRTAN.LIS LISTR.LIS DTSUM_1.LIS DTSUM_0.LIS UVPLT_UVD.PS UVPLT_UVPA.PS SN_ACCOR_AMP_2.PS SN_APCAL_AMP_1.PS SN_FRING01_DEL_2.PS SN_APCAL_AMP_2.PS VPLOT_AP_2.PS POSSM01_AP_1.PS

POSSM01_AP_2.PS POSSM02_AP_1.PS POSSM02_AP_2.PS SN_CALIB_DEL_1.PS SN_FRING01_PHA_1.PS SN_FRING01_PHA_2.PS SN_FRING01_RAT_1.PS SN_FRING01_RAT_2.PS SN_FRING01_SNR_1.PS SN_FRING01_SNR_2.PS SN_FRING01_DEL_1.PS SN_CALIB_DEL_2.PS

SN_CALIB_PHA_1.PS SN_CALIB_PHA_2.PS SN_CALIB_RAT_1.PS SN_CALIB_RAT_2.PS SN_CALIB_SNR_1.PS SN_CALIB_SNR_2.PS VPLOT_AP_1.PS UVPLT_UV.PS SN_ACCOR_AMP_1.PS

More details on the Images and Modelfits are found in this page.