Baseline errors on European VLBI Network measurements. II. Instrumental polarization.

Details Baseline errors on European VLBI Network measurements. II. Instrumental polarization. Baseline errors on European VLBI Network measurements. II. Instrumental polarization.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..116..167m&link_type=abstract

Astronomy and Astrophysics Supplement, v.116, p.167-176

Astronomy and Astrophysics

Astrophysics

3

Methods: Analytical, Methods: Data Analysis, Techniques: Interferometric, Instruments: Interferometers

Scientific paper

This paper belongs to a series of articles which aim at determining higher quality maps from VLBI measurements. We discuss the result of a statistical study on closure phases of point-like sources observed with the EVN at 6 cm. Such a quantity is a combination of baseline based errors and thermal noise. The average closure phase is found to be in the range 0.2deg -0.5deg while the associated thermal noise contribution is found to be almost one order of magnitude lower. In order to quantify this effect in terms of dynamic range degradation we have added such closure errors to simulated data of an EVN observation of a point source. The dynamic range ratio between two maps, one produced with thermal noise only, and the other with closure errors is a factor of 6. In the second part of this paper is discussed how the instrumental polarization contributes significantly to the closure phase. Its removal should therefore improve the quality of the maps. Finally problems connected with the cross polarization data for baselines with Westerbork along with the necessity of a similar analysis to be performed in each 2 MHz frequency channel are discussed.

Affiliated with

Also associated with

No associations

Rating

Baseline errors on European VLBI Network measurements. II. Instrumental polarization. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Baseline errors on European VLBI Network measurements. II. Instrumental polarization., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Baseline errors on European VLBI Network measurements. II. Instrumental polarization. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1642722