J/A+A/640/A38ivo://CDS.VizieR/J/A+A/640/A38doi:10.26093/cds/vizier.36400038CDSRampazzo R.Omizzolo A.Uslenghi M.Roman J.Mazzei P.,Verdes-Montenegro L.Marino A.Jones M.G.2021-03-29T12:13:18Z2020-08-10T07:36:52ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryvisible-astronomysloan-photometryIsolated early-type galaxies are evolving in unusually poor environments for this morphological family, which is typical of cluster inhabitants. We investigate the mechanisms driving the evolution of these galaxies. Several studies indicate that interactions, accretions, and merging episodes leave their signature on the galaxy structure, from the nucleus down to the faint outskirts. We focus on revealing such signatures, if any, in a sample of isolated early-type galaxies, and we quantitatively revise their galaxy classification. We observed 20 (out of 104) isolated early-type galaxies, selected from the AMIGA catalog, with the 4KCCD camera at the Vatican Advanced Technology Telescope (VATT) in the Sloan Digital Sky Survey (SDSS) g and r bands. These are the deepest observations of a sample of isolated early-type galaxies so far: on average, the light profiles reach {mu}_g_~=28.11+/-0.70mag/arcsec^2^ and {mu}_r_~=27.36+/-0,68mag/arcsec^2^. The analysis was performed using the AIDA package, providing point spread function-corrected 2D surface photometry up to the galaxy outskirts. The package provides a model of the 2D galaxy light distribution, which after model subtraction enhances the fine and peculiar structures in the residual image of the galaxies. Our re-classification suggests that the sample is composed of bona fide early-type galaxies spanning from ellipticals to late-S0s galaxies. Most of the surface brightness profiles are best fitted with a bulge plus disc model, suggesting the presence of an underlying disc structure. The residuals obtained after the model subtraction show the nearly ubiquitous presence of fine structures, such as shells, stellar fans, rings, and tails. Shell systems are revealed in about 60% of these galaxies. Because interaction, accretion, and merging events are widely interpreted as the origin of the fans, ripples, shells and tails in galaxies, we suggest that most of these isolated early-type galaxies have experienced such events. Because they are isolated (after 2-3Gyr), these galaxies are the cleanest environment in which to study phenomena connected with events like these.2020A&A...640A..38Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/640/A38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/77 : Isolated Pairs of Galaxies in Northern HemisphereJ/A+A/436/443 : AMIGA. I. Velocities of CIG galaxies (Verdes-Montenegro+ 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/640/A38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/640/A38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/640/A38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/640/A38https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/640/A38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/640/A38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/640/A38/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/640/A38/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/640/A38/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/640/A38/list?GETtext/xml+votable180.050000true129.0157130.212110.0055555555555555566/5029 5922 7515 9248 9591 9777 10145 10546 10590 10626 11379 11418 11446 11694 11826 27566 27779 27993 28465 31642https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/640/A38?format=asciiOpticaldefaultJ/A+A/640/A38/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy name, KIGNNN, K73 NNN in Simbadmeta.id;meta.maincharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainscaleScale of the imagearcsec/pixinstr.scalefloatNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintBand[gr] Observed bandinstr.bandpasscharsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharSimbadSimbad column added by the CDSmeta.ref.urlchar