OmegaWINGS: OmegaCAM-VST observations of WINGS galaxy clusters

Abstract

Context. Wide-field observations targeting galaxy clusters at low redshift are complementary to field surveys and provide the local benchmark for detailed studies of the most massive haloes in the local Universe. The Wide-field Nearby Galaxy-cluster Survey (WINGS) is a wide-field multi-wavelength survey of X-ray selected clusters at z = 0.04-0.07. The original 34 × 34 WINGS field of view has now been extended to cover a 1 deg 2 field with both photometry and spectroscopy. Aims. We 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. Methods. The data reduction was carried out with a modified version of the ESO-MVM (also known as ALAMBIC) reduction package, adding a cross-talk correction, the gain harmonisation, and a control procedure for problematic CCDs. The stray-light component was corrected for by employing our own observations of populated stellar fields. Results. With a median seeing of 1 in both bands, our 25-min exposures in each band typically reach the 50% completeness level at V = 23.1 mag. The quality of the astrometric and photometric accuracy has been verified by comparison with the 2MASS and SDSS astrometry, and SDSS and previous WINGS imaging. Star-to-galaxy separation and sky-subtraction procedure were tested comparing them with previous WINGS data. Conclusions. The Sextractor photometric catalogues are publicly available at the CDS and will be included in the next release of the WINGS database on the Virtual Observatory together with the OmegaCAM reduced images. These data form the basis for a large ongoing spectroscopic campaign with AAOmega at the AAT and are being employed for a variety of studies.

Characterization of Omega-WINGS galaxy clusters

“…The photometric and spectroscopic WINGS/Omega-WINGS catalogs are now available on the Virtual Observatory (Moretti et al 2014;Gullieuszik et al 2015). The WINGS database includes not only the magnitudes of the galaxies in the field, but also important quantities derived from the photometric and spectroscopic analyses, such as effective radii and surface brightness, flattening, masses, light indexes, and velocity dispersions.…”

“…The V-and B-band magnitudes used in this work are the SExtractor AUTO magnitudes (see Bertin & Arnouts 1996 for further details), whose V-band completeness was calculated by Varela et al (2009) for the WINGS sample (90% completeness threshold at m V ∼ 21.7 mag), and by Gullieuszik et al (2015) for the Omega-WINGS sample (90% completeness threshold at m V ∼ 21.2 mag).…”

“…The first work is dedicated to the problem of the accurate determination of stellar light and stellar mass profiles of galaxy clusters. We exploit for this goal the large optical and spectroscopic database provided by the WIde-field Nearby Galaxy-cluster Survey (WINGS; Fasano et al 2006;Varela et al 2009;Cava et al 2009) and its Omega-WINGS extension (Gullieuszik et al 2015;Moretti et al 2017), which is available for nearby galaxy clusters (0.04 z 0.07). The first step carried out here provides the integrated luminosity (and stellar mass) profiles for 46 (42) nearby clusters.…”

Structural and dynamical modeling of WINGS clusters

“…Additional photometric information comes from follow-up imaging surveys in the near-infrared (NIR) J and K bands (WINGS-NIR, 28 clusters; Valentinuzzi et al 2009) and the U Johnson band (17 clusters; Omizzolo et al 2014). Currently, the photometric data set is being expanded by very wide field observations (four times the original WINGS area) taken with the VLT Survey Telescope (VST) OmegaCAM in the usual B and V Johnson bands (Gullieuszik et al 2015) and in the Sloan u band (D'Onofrio et al, in prep. ).…”

GASP. III. JO36: A Case of Multiple Environmental Effects at Play?

“…GASP 1 (GAs Stripping Phenomena in galaxies with MUSE) is an ESO large program (P.I. B. Poggianti) that uses the second generation IFU MUSE mounted on the Nasmyth focus of the UT4 at the VLT, to observe a sample of 124 low redshift (z = 0.04−0.07) galaxies with evidence of disturbed morphology in optical images of clus-1 http://web.oapd.inaf.it/gasp/index.html ters from the WINGS/OmegaWINGS project (Fasano et al 2006;Gullieuszik et al 2015). GASP was granted 120 hours of time spread over four semesters from Period 96 (October 2015), and the second half of the observational campaign is currently being performed.…”