MOS Observations



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MOS Observations

 

MOS observations were conducted as a secondary observing program during 1.5 nights of engineering/discretionary time on July 27-28, 1994. The first half-night was plagued by high humidity, but one field was successfully observed. Weather was good on the second night except for high altitude cirrus clouds towards the end. Two fields were observed. The bonnette angle had to remain fixed for the needs of the primary observing program. Slitlets in these multi-object MOS observations were aligned along the major axis of a galaxy only when the galaxy position angle corresponded to the bonnette angle of the telescope. Misalignments between the position angle of the major axis of a target galaxy and the position angle of the slitlet artificially decrease the magnitude of V sin . The velocity error depends on slit width, seeing, and the rotation curve in the central regions of the target galaxies.

 

 

 

 



Luc Simard
Mon Sep 2 12:37:40 PDT 1996