J/ApJ/938/82ivo://CDS.VizieR/J/ApJ/938/82doi:10.26093/cds/vizier.19380082CDSO'Neill T.J.Indebetouw R.Sandstrom K.Bolatto A.D.Jameson K.E.,Carlson L.R.Finn M.K.Meixner M.Sabbi E.Sewilo M.2025-02-12T20:09:23Z2024-10-08T08:19:03ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsh-ii-regionsmolecular-cloudsyoung-stellar-objectsinterstellar-mediumco-line-emissionstellar-massesgalaxy-kinematicsinfrared-sourcesvisible-astronomyNGC 602 is a young, low-metallicity star cluster in the "Wing" of the Small Magellanic Cloud. We reveal the recent evolutionary past of the cluster through analysis of high-resolution (~0.4pc) Atacama Large Millimeter/submillimeter Array observations of molecular gas in the associated HII region N90. We identify 110 molecular clumps (R<0.8pc) traced by CO emission, and study the relationship between the clumps and associated young stellar objects (YSOs) and pre-main-sequence (PMS) stars. The clumps have high virial parameters (typical {alpha}_vir_=4-11) and may retain signatures of a collision in the last <~8Myr between HI components of the adjacent supergiant shell SMC-SGS 1. We obtain a CO-bright-to-H2 gas conversion factor of X_CO,B_=(3.4+/-0.2)x10^20^cm^-2^ (K.km/s)^-1^, and correct observed clump properties for CO-dark H_2_ gas to derive a total molecular gas mass in N90 of 16600+/-2400M_{sun}_. We derive a recent (<~1Myr) star formation rate of 130+/-30M_{sun}_/Myr with an efficiency of 8%+/-3% assessed through comparing total YSO mass to total molecular gas mass. Very few significant radial trends exist between clump properties or PMS star ages and distance from NGC 602. We do not find evidence for a triggered star formation scenario among the youngest (<~2Myr) stellar generations, and instead conclude that a sequential star formation process in which NGC 602 did not directly cause recent star formation in the region is likely.2022ApJ...938...82Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/938/82CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/428/693 : Rosette Nebula & Maddalena Cloud structures (Williams+ 1994)J/MNRAS/289/225 : SMC HI shells velocities (Staveley-Smith+ 1997)J/ApJS/110/21 : Molecular clouds in Cepheus and Cassiopeia (Yonekura+ 1997)J/ApJ/686/948 : CO in extragalactic giant molecular clouds (Bolatto+, 2008)J/ApJ/681/290 : HST/ACS photometry in the SMC (Schmalzl+, 2008)J/ApJ/699/1092 : Giant molecular clouds (SRBY) (Heyer+, 2009)J/ApJ/691/1560 : Dense core survey in the Orion B cloud (Ikeda+, 2009)J/ApJ/730/78 : Hubble and Spitzer photometry of NGC 602 (Carlson+, 2011)J/A+A/533/A109 : Pisa pre-main sequence tracks & isochrones (Tognelli+, 2011)J/ApJ/745/173 : UV absorption sight lines of LMC and SMC (Welty+, 2012)J/A+A/549/A70 : NGC 4214 multiband images (Hermelo+, 2013)J/ApJ/774/73 : ALMA CO observations of 30 Dor (Indebetouw+, 2013)J/AJ/146/62 : HERschel HERITAGE in Magellanic Clouds (Meixner+, 2013)J/AJ/148/124 : Herschel key program Heritage (Seale+, 2014)J/MNRAS/449/639 : VMC survey. XIV. SFR in SMC (Rubele+, 2015)J/ApJ/811/78 : Elemental depletions in Magellanic Clds (Tchernyshyov+, 2015)J/ApJ/833/229 : Star forming cloud-giant mocl complexes (Lee+, 2016)J/A+A/589/A28 : N66, N88 & N25+N26 emission line maps (Requena-Torres+, 2016)J/A+A/599/A9 : NGC 4214 [CII] line profile (Fahrion+, 2017)J/ApJ/841/109 : Cloud decomposition & SFR measurements (Ochsendorf+, 2017)J/ApJ/835/278 : Molecular clouds in the dwarf galaxy NGC6822 (Schruba+, 2017)J/ApJ/853/175 : ^12^CO & 13CO cores & clumps in LHA 120-N 55 (Naslim+, 2018)J/ApJ/854/154 : N159 ^12^CO and ^13^CO (2-1) clumps (Nayak+, 2018)J/ApJ/876/141 : ALMA obs. of giant moclds in Hen 2-10 (Imara+, 2019)J/A+A/632/A106 : LMC-N11 (LHA 120-N11) [CII], HI, CO sp. (Lebouteiller+, 2019)J/A+A/625/A104 : Stellar param. of OB stars in SMC wing (Ramachandran+, 2019)J/A+A/643/A141 : Tracing total molecular gas in galaxies (Madden+, 2020)J/A+A/641/A97 : ALMA Magellanic Bridge A mocl (Valdivia-Mena+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/938/82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/938/82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/938/82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/938/82https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/938/82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/938/82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/938/82/tablea1 (Clump properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/938/82/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/938/82/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/938/82/tablea1?GETtext/xml+votable180.050000true22.3982-73.55010.005555555555555556Cone search capability for table J/ApJ/938/82/tablea2 (YSO properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/938/82/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/938/82/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/938/82/tablea2?GETtext/xml+votable180.050000true22.3582-73.57970.0055555555555555566/33297 33299https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/938/82?format=asciiOpticalInfraredRadiodefaultJ/ApJ/938/82/tablea1Clump propertiesDEJ2000[-73.6/-73.5] Declination (J2000)degpos.eq.dec;meta.mainTpk12CO[2.2/22.6] ^12^CO peak antenna temperatureKphot.antennaTemp;em.line.CO;stat.maxfloatTpk13CO[0.5/7.2] ^13^CO peak antenna temperatureKphot.antennaTemp;em.line.CO;stat.maxfloatW12[59.6/13902] Total integrated ^12^CO intensityK.km/sphot.flux.density;em.line.COdoubleReff[0.26/0.8] Effective radius from ellipse fittingpcphys.size.radiusfloate_Reff[0/0.4] Uncertainty in Reffpcstat.error;phys.size.radiusfloatVlsr12Pk[159/180] Peak ^12^CO velocitykm/sphys.veloc;pos.lsr;em.line.COfloatsigv12[0.2/1.1] CO velocity dispersionkm/sphys.veloc.dispersion;em.line.COfloatmvir12[16.5/619.5] Virial masssolMassphys.massfloate_mvir12[0.7/256.3] Uncertainty in mvir12solMassstat.errorfloataVir12[1.3/39] Virial parameter, {alpha}_vir_phys.mass;arith.ratiofloate_aVir12[0.1/12.3] Uncertainty in aVir12stat.errorfloat[CSM2011]YSO identifier(s) as in Table A2 (2)meta.id.assoccharGroup[r] Group (3)meta.code.memberchare_sigv12[0/0.04] Uncertainty in sigv12km/sstat.error;phys.veloc.dispersion;em.line.COfloatmLTE[12/287]? LTE clump mass (1)solMassphys.massfloatnullablee_mLTE[6/19.1]? Uncertainty in mLTEsolMassstat.error;phys.massfloatnullablemXCO[1/281] X factor corrected, ^12^CO clump masssolMassphys.mass;em.line.COfloate_mXCO[0.2/18] Uncertainty in mXCOsolMassstat.error;phys.mass;em.line.COfloatsurfp[3.3/243.4] Surface densitysolMass.pc**-2phot.flux.density.sbfloatrhoc[16.6/1217.1] Volume density at 0.1pcsolMass.pc**-3meta.bib.volumefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/110] Clump running sequence identifiermeta.id;meta.mainintRAJ2000[22.3/22.5] Right Ascension (J2000)degpos.eq.ra;meta.mainJ/ApJ/938/82/tablea2YSO propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[CSM2011]YSO identifier (YNNN) (1)meta.id;meta.maincharf_[CSM2011][i] "i" flag for source Y270 (1)(2)meta.codecharSSTNGC602IRAC designation (JHHMMSS.ss+DDMMSS.s) (1)meta.idcharRAJ2000[22.17/22.6] Right Ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000[-73.6/-73] Declination (J2000) (1)degpos.eq.dec;meta.mainMstar[1.2/7.8] Fit YSO MasssolMassphys.mass;meta.modelledfloatdM/dt[0.02/252] Fit envelope accretion rate1e-06solMass.yr**-1phys.mass.lossfloat