J/A+A/634/A95ivo://CDS.VizieR/J/A+A/634/A95doi:10.26093/cds/vizier.36340095CDSCairos L.M.Gonzalez-Perez J.N.2021-01-05T11:53:42Z2020-02-13T07:26:57ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyLow-luminosity, active star-forming blue compact galaxies (BCGs) are excellent laboratories for investigating the process of star formation on galactic scales and probing the interplay between massive stars and the surrounding interstellar (or intergalactic) medium. We investigated the morphology, structure, and stellar content of the Blue Compact Galaxy Mrk 900, combining optical integral field observations obtained with VIMOS at the VLT and deep broad-band photometry taken at the 2.5 m NOT telescope. From the integral field data, we built continuum, emission, and diagnostic line ratio maps and produced velocity and velocity dispersion maps. We also generated the integrated spectrum of the major HII regions and the nuclear area to determine reliable physical parameters and oxygen abundances. The broad-band data, tracing the galaxy up to radius 4 kpc, allowed us to investigate the properties of the low surface brightness underlying stellar host. We disentangle two different stellar components in Mrk 900: a young population, which resolves into individual stellar clusters with ages ~5.5-6.6Myr and extends about 1 kpc along the galaxy minor axis, is placed on top of a rather red and regular shaped underlying stellar host, several Gyr old. We find evidence of a substantial amount of dust and an inhomogeneous extinction pattern, with a dust lane crossing the central starburst. Mrk 900 displays overall rotation, although distorted in the central, starburst regions; the dispersion velocity map is highly inhomogeneous, with values increasing up to 60km/s at the periphery of the SF regions, where we also find hints of the presence of shocks. Our observational results point to an interaction or merger with a low-mass object or infalling gas as plausible trigger mechanisms for the present starburst event.2020A&A...634A..95Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/634/A95CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/634/A95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/634/A95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/634/A95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/634/A95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/634/A95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/634/A95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/634/A95/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/634/A95/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/634/A95/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/634/A95/list?GETtext/xml+votable180.050000true322.498472.414240.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/634/A956/19125https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/634/A95?format=asciidefaultJ/A+A/634/A95/listList of fits filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNz? Number of slices for the datacubesmeta.numberintnullableObs.dateObservation datestime.epoch;obsnullableblambda? Lower value of wavelength interval, for the datacubes0.1nmem.wlfloatnullableBlambda? Upper value of wavelength interval, for the datacubes0.1nmem.wlfloatnullabledlambda? Wavelength resolution, for the datacubes0.1nmspect.resolutionfloatnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar