J/AJ/159/17ivo://CDS.VizieR/J/AJ/159/17doi:10.26093/cds/vizier.51590017CDSWeistrop D.Nelson C.H.Angione R.Bachilla R.2020-02-27T07:41:48Z2020-02-27T08:38:11ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopystar-forming-regionsredshiftedchemical-abundancesinfrared-photometryvisible-astronomyWide-band photometryWe report long-slit spectroscopy of the early major merger galaxies NGC 3395/NGC 3396. The spectra are consistent with those for star-forming galaxies, but there is some indication of LINER-like active galactic nucleus activity in the center of NGC 3396. The total star formation rate in the regions observed is 2.83 M_{sun}_/yr, consistent with estimates for the entire galaxies. The highest abundances are in the centers of the galaxies, with the abundances decreasing with distance. There is a correlation between high abundance and high ionization parameter, both of which can be attributed to the presence of massive stars. Modeling with SB 99 indicates the star-forming regions are younger than 10 Myr. There are 1000-2000 WNL stars in the system, along with several thousand O stars, consistent with the ages of the star-forming regions. The highest electron densities are found in young regions with high star formation rates. The electron temperatures are higher than results for non-interacting galaxies, which is probably due to shock waves produced by the galaxy-galaxy interaction, the outflow of gas from massive stars, and/or collisions between gas clouds in the galaxies. There is star formation in the bridge of material between the galaxies. These regions are among the youngest in the system and have low abundances, suggesting the gas was pulled from the outer parts of the galaxies. X-ray point sources, probably high-mass X-ray binaries, are associated with several star-forming regions.2020AJ....159...17Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/17CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/125/1696 : Star-forming knots in NGC 3395/3396 (Hancock+, 2003)J/AJ/143/98 : Spectroscopy of star-forming regions in NGC 4194J/ApJS/208/10 : Effects of a {kappa}-distribution in HII regionsJ/MNRAS/432/998 : Kinematics of Arp 270 (NGC 3395) (Zaragoza-Cardiel+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/17https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/159/17/table2 (Region photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/159/17/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/17/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/17/table2?GETtext/xml+votable180.050000true162.4586932.982890.0055555555555555566/5241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/159/17?format=asciiOpticalInfrareddefaultJ/AJ/159/17/table5Results for individual spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPA[12/136] Position angle of slit, north to eastdegobs.paramintDist[-41.1/98.7] Distance of spectrum from slit centerarcsecobs.paramfloatSFR[0/0.18] Star formation ratesolMass/yrphys.SFRfloate_SFR[0/0.02] Uncertainty in SFRsolMass/yrstat.error;phys.SFRfloat12+log(O/H)[8.55/8.98]? Oxygen abundance (1)phys.abundfloatnullableE_12+log(O/H)[0.01/0.23]? Upper uncertainty in 12+log(O/H)stat.error;stat.maxfloatnullablee_12+log(O/H)[0.01/0.31]? Lower uncertainty in 12+log(O/H)stat.error;stat.minfloatnullablelog(q)[6.8/8.28]? Log of the ionization parameterphys.ionizParamfloatnullableE_log(q)[0.02/0.46]? Upper uncertainty in log(q)stat.error;stat.maxfloatnullablee_log(q)[0.02/0.31]? Lower uncertainty in log(q)stat.error;stat.minfloatnullableAge(M6)[1.6/5.5] Age calculated using Model 6Myrtime.age;meta.modelledfloate_Age(M6)[0/0.9] Uncertainty in Age(M6)Myrstat.errorfloatAge(M2)[6/10] Age calculated using Model 2Myrtime.age;meta.modelledfloate_Age(M2)[0/0.65] Uncertainty in Age(M2)Myrstat.errorfloatn(e)[0.2/24]? Electron density10cm**-3phys.density;phys.electronfloatnullablel_n(e)[<] Limit flag on electron density rangemeta.code.errorcharb_n(e)[0.03/29]? Lower limit of n(e) range1000cm**-3phys.density;phys.electron;stat.minfloatnullableB_n(e)[0.2/0.36]? Upper limit of n(e) range1000cm**-3phys.density;phys.electron;stat.maxfloatnullableRegionGalaxy feature identified in Figure 3 (see table2.dat)obs.fieldcharJ/AJ/159/17/table2Region photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionRegion identifier (see Figure 1 of this paper)meta.id;obs.fieldcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmag[16.59/22.07]? V band magnitudemagphot.mag;em.opt.VfloatnullableU-B[-1.16/0.07]? U-B colox indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V[0.18/0.52]? B-V colox indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-R[0.23/0.5]? V-R colox indexmagphot.color;em.opt.V;em.opt.RfloatnullableJ/AJ/159/17/table4Redshift, reddening, and relative fluxes for individual spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPA[12/136] Position angle of slit, north to eastdegobs.paramintDist[-53.7/102.3] Distance of spectrum from slit centerarcsecobs.paramfloatz[0.00511/0.00615] Spectroscopic redshiftsrc.redshiftdoubleE(B-V)[0/0.58]? The (B-V) color excessmagphot.color.excessfloatnullableO2-3727[1.6/8.09]? Relative flux of [O II] 3727{AA} (1)phot.flux;arith.ratiofloatnullableO3-4363[0.02/0.35]? Relative flux of [O III] 4363{AA} (1)phot.flux;arith.ratiofloatnullableu_O3-4363[:] Uncertainty flag in O3-4363meta.code.errorcharFe3-4658[0.01/0.1]? Relative flux of [Fe III] 4658{AA} (1)phot.flux;arith.ratiofloatnullableu_Fe3-4658[:] Uncertainty flag in Fe3-4658meta.code.errorcharHe2-4686[0.03/0.06]? Relative flux of [He II] 4686{AA} (1)phot.flux;arith.ratiofloatnullableu_He2-4686[:] Uncertainty flag in He2-4686meta.code.errorcharHb[1]? Relative H{beta} flux (1)phot.flux;arith.ratiofloatnullableO3-4959[0.24/1.11]? Relative flux of [O III] 4959{AA} (1)phot.flux;arith.ratiofloatnullableu_O3-4959[:] Uncertainty flag in O3-4959meta.code.errorcharO3-5007[0.73/2.95]? Relative flux of [O III] 5007{AA} (1)phot.flux;arith.ratiofloatnullableu_O3-5007[:] Uncertainty flag in O3-5007meta.code.errorcharN2-6548[0.07/0.35]? Relative flux of [N II] 6548{AA} (1)phot.flux;arith.ratiofloatnullableu_N2-6548[:] Uncertainty flag in N2-6548meta.code.errorcharHa[2.84/2.86]? Relative H{alpha} flux (1)phot.flux;arith.ratiofloatnullableN2-6583[0.27/0.91]? Relative flux of [N II] 6583{AA} (1)phot.flux;arith.ratiofloatnullableu_N2-6583[:] Uncertainty flag in N2-6583meta.code.errorcharS2-6716[0.24/1.07]? Relative flux of [S II] 6716{AA} (1)phot.flux;arith.ratiofloatnullableu_S2-6716[:] Uncertainty flag in S2-6716meta.code.errorcharS2-6731[0.19/0.69]? Relative flux of [S II] 6731{AA} (1)phot.flux;arith.ratiofloatnullableu_S2-6731[:] Uncertainty flag in S2-6731meta.code.errorcharFHb[9.3e-17/4.2e-14]? Measured H{beta} flux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.flux;em.line.Hbetafloatnullableu_FHb[:] Uncertainty flag in FHbmeta.code.errorcharSlit[2/15] Combined spectrum slit heightpixinstr.setupint