Data Analysis Of VMC Survey Project

Magellanic Clouds are the nearest neighbor of our Milky Way. Their lowmetallicity and distance from us make it to be the interested object for as-tronomers。VISTA survey of Magellanic Clouds system (VMC) is one of impor?tant survey projects from Europe South Observatory. It provide inferred imageswhich cover most part of Magellanic Clouds with Y, J, Ks bands, including LargeMagellanic Cloud, Small Magellanic Cloud, the bridge between them and part ofstar stream of Magellanic Cloud.As one of important part of VMC project, the VISTA Data Flow Sys-tem(VISTA) provide the final images and data acquired by VMC project. Theproducts of VISTA includes the original images, pre-precess images, deep images,catalogue of sources in these images with magnitude from aperture photometry.Since the VDFS pipeline was designed for general object, we are not sureif it can provide good enough data for the fainter sources. Some project will besensitive with the low mass sources and the fainter hand of data from VMC willplay important role in the final result so that confirm the behave of fainter handare crucial for these project.The goal of our work was to make sure if the final result from VDFS aregood enough to be used on fainter sources, we perform our own data reductionon the origin images and compare our result with data from VDFS and point thebenefit of our processing, result description as bellow:1.Point Spread Function(PSF) of the images combined from origin imagesof several epoch don’t vary from one region to another.2.Results description of aperture and PSF photometry.3.The final result from our data reduction provide higher accuracy thanthe VDFS’s and give larger catalogue in the fainter hand.4.The completeness of different region in three bands will be provide, causeits importance for defining the fainter limits of observation。 5. Luminosity of our test region with deferent density.