研究目的
To present the Johnson B- and V-band OmegaCAM at the VST observations of 46 WINGS clusters together with the data reduction, data quality, and Sextractor photometric catalogues.
研究成果
The OmegaWINGS survey provides high-quality B and V band imaging for 46 clusters, with robust data reduction and publicly available catalogues. The data support ongoing spectroscopic campaigns and various studies on galaxy properties and cluster environments, extending coverage to larger radii than previous surveys.
研究不足
The central vignetting cross from segmented filters could not be entirely removed, leading to a masked vertical stripe in images. Some CCDs had day-to-day gain variations, and CCD 82 had stability issues, requiring data discard in affected cases. The photometric depth is shallower than original WINGS in some cases, and classification reliability decreases for fainter objects.
1：Experimental Design and Method Selection:
The study involves wide-field optical imaging of galaxy clusters using the OmegaCAM on the VST telescope. Data reduction was performed with a modified version of the ESO-MVM (ALAMBIC) package, incorporating cross-talk correction, gain harmonization, and procedures for handling problematic CCDs. Stray-light correction was done using observations of stellar fields.
2：Sample Selection and Data Sources:
46 WINGS clusters at redshifts z=
3：04-07 were selected from X-ray samples, observed in B and V bands. Data include science, twilight flat-field, and bias frames. List of Experimental Equipment and Materials:
OmegaCAM camera on the VST telescope, CCD mosaic, Johnson B and V filters, calibration frames (bias and flats), reference catalogs (2MASS, SDSS).
4：Experimental Procedures and Operational Workflow:
Observations were conducted in service mode with specific dithering patterns to handle vignetting. Data reduction steps included splitting multi-extension files, cross-talk correction, stacking calibration frames, gain harmonization, illumination correction, astrometric calibration, sky subtraction, and final stacking.
5：Data Analysis Methods:
Photometric catalogues were generated using Sextractor, with parameters like magnitudes, sizes, and classifications. Photometric calibration was done using WINGS stars as standards, and astrometric accuracy was verified against 2MASS and SDSS.
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