VI/112ivo://CDS.VizieR/VI/112CDSKnapen J.H.de Jong R.S.Stedman S.Bramich D.M.Folkes S.L.,Bradley T.R.2016-09-19T14:44:11Z2006-09-14T18:54:51ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesvisible-astronomyinfrared-sourcesphotometryWe present optical observations of a sample of 57 spiral galaxies and describe the procedures followed to reduce the data. We have obtained images in the optical B and I broad bands, as well as in H{alpha}, with moderate spatial resolution and across wide enough fields to image the complete disks of the galaxies. In addition, we observed 55 of our sample galaxies in the R and eight in the V band, and imaged a subset through a dedicated narrow continuum filter for the H{alpha} line. We describe the data reduction procedures we developed in the course of this work to register, combine and photometrically calibrate each set of images for an individual galaxy. We describe in some detail the procedure used to subtract the continuum emission from our H{alpha} images. In companion papers, we describe near-infrared imaging of the galaxy sample, and present analyses of disk scale lengths, and of properties of bars, rings, and HII regions in the sample galaxies. The images described here will be made available for use by other researchers through the CDS.2003MNRAS.344..527Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/VI/112CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=VI/112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=VI/112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=VI/112https://vizier.cds.unistra.fr/viz-bin/votable?-source=VI/112https://vizier.iucaa.in/viz-bin/votable?-source=VI/112http://vizieridia.saao.ac.za/viz-bin/votable?-source=VI/112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=VI/112InfraredOpticaldefaultVI/112/tableGlobal parameters of the galaxiesiInclination (1)degsrc.orbital.inclinationintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCNGC galaxy identification numbermeta.id;meta.maincharMTypeMorphological type (1)src.morph.typecharD25Apparent major isophotal diameter (1)arcminphys.angSizefloatArmClassSpiral arm class (2)meta.code.class;src.morph.paramintPA? Position angle of disk major axis (1)degpos.posAngintnullableBMAGTotal absolute B-magnitude (1)magphys.magAbs;em.opt.BfloatRVMean heliocentric radial velocity (1)km/sspect.dopplerVeloc;stat.meanintDistDistance (3)Mpcpos.distancefloatscaleImage scalepc/arcsecinstr.scale;obs.imageintBexpB-band exposure timemintime.duration;obs.exposureintRexp? R-band exposure timemintime.duration;obs.exposureintnullableIexp? I-band exposure timemintime.duration;obs.exposureintnullableKsexp? Ks-band exposure timemintime.duration;obs.exposureintnullableHaexpH-alpha exposure timemintime.duration;obs.exposure;em.line.HalphaintBSeeingB-band seeingarcsecinstr.obsty.seeingfloatRSeeing? R-band seeingarcsecinstr.obsty.seeingfloatnullableISeeing? I-band seeingarcsecinstr.obsty.seeingfloatnullableKsSeeing? Ks-band seeingarcsecinstr.obsty.seeingfloatnullableHaSeeingH-alpha seeingarcsecinstr.obsty.seeing;spect.linefloatHaFiltFilter used for H-alpha imaginginstr.setup;instr.filtercharHacsFiltFilter used for continuum imaginginstr.setup;instr.filtercharHaScale? Scale factor used to subtract the continuum from H-alpha.arith.factor;instr.scale;spect.continuumfloatnullableKsSizeSize of Ks-band imagearcminpos.distance;phys.sizefloatSizeSize of optical imagesarcminphys.angSize;em.optcharVI/112/imagesImage filenamesBB imagecharHaH{alpha} imagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCNGC galaxy identification numbercharHaContH{alpha} image for the 6470/115 continuum filtercharHacsH{alpha} image, continuum subtractedcharII-band imagecharKK-band imagecharRR-band imagecharVV-band imagechar