J/other/AstBu/78ivo://CDS.VizieR/J/other/AstBu/78.373CDSKirsanova M.S.Tatarnikov A.M.Boley P.A.Vibe D.A.Maclennikova N.A.,Tatarnikov A.A.2025-01-09T07:52:04Z2023-08-24T08:44:44ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesh-ii-regionsinterstellar-mediumchemical-abundancesWe performed photometric observations of the S255, S257, S140, NGC7358 and the Orion Bar photo-dissociation regions (PDRs) at 2 micron using narrow-band filters centered on the Br-gamma, H2 and [FeII] lines, as well as the narrow-band Kcont and the broad-band H filters for continuum subtraction. The observations were done with the 2.5-m telescope of the SAI Caucasian Mountain Observatory and the near-infrared camera and spectrograph ASTRONIRCAM. We find several high-density arc-like structures in the Br-gamma and [FeII] images of the ionized gas in NGC 7538 and extended shells and arcs visible through the H2 emission. The H ionization front and H2 dissociation front are merged in NGC 7538. In S 255 and S 257 we detected only Br-gamma emission from the H II regions and bright H2 emission from the PDRs. The projected distance between the H ionization and H2 dissociation fronts are approx. 0.3-0.4pc, which cannot be explained using models of a uniform medium. Most probably, the ionized and neutral gas in these PDRs is clumpy. The H I-to-H2 transitions in the NGC 7538, S 255, S 257 and S 140 PDRs are gradual with no sharp borders. This conclusion also agrees with the suggestion of a clumpy medium.2023AstBu..78..372Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/AstBu/78.373CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/AstBu/78.373https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/AstBu/78.373http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/AstBu/78.373https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/AstBu/78.373https://vizier.iucaa.in/viz-bin/votable?-source=J/other/AstBu/78.373http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/AstBu/78.373GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/AstBu/78.373/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/AstBu/78.373/list?https://vizier.iucaa.in/viz-bin/conesearch/J/other/AstBu/78.373/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/AstBu/78.373/list?GETtext/xml+votable180.050000true348.3988761.500010.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/other/AstBu/78.3736/14317 15667 21439 23969https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/AstBu/78.373?format=asciiInfrareddefaultJ/other/AstBu/78.373/listList of fits imagesFilterNarrow-band filtermeta.id;instr.filtercharrecnoRecord 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.mainNameTarget namemeta.id;meta.maincharscaleScale of the imagearcsec/pixinstr.scalefloatNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar