J/AJ/144/173ivo://CDS.VizieR/J/AJ/144/173doi:10.26093/cds/vizier.51440173CDSDirienzo W.J.Indebetouw R.Brogan C.Cyganowski C.J.Churchwell E.,Friesen R.K.2019-12-03T10:56:19Z2014-02-14T08:32:37ZCDS support team

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

cds-question@unistra.frh-ii-regionsyoung-stellar-objectsstellar-massesradial-velocitygalaxy-kinematicsWe investigated six HII regions with infrared, bright rimmed bubble or cometary morphology, in search of quantitative evidence for triggered star formation, both collect and collapse and radiatively driven implosion (RDI). We identified and classified 458 young stellar objects (YSOs) in and around the HII regions. YSOs were determined by fitting a collection of radiative transfer model spectral energy distributions to infrared photometry for a large sample of point sources. We determined areas where there exist enhanced populations of relatively unevolved YSOs on the bright rims of these regions, suggesting that star formation has been triggered there. We further investigated the physical properties of the regions by using radio continuum emission as a proxy for ionizing flux powering the HII regions, and ^13^CO(1-0) observations to measure masses and gravitational stability of molecular clumps. We used an analytical model of collect and collapse triggered star formation, as well as a simulation of RDI, and thus we compare the observed properties of the molecular gas with those predicted in the triggering scenarios. Notably, those regions in our sample that show evidence of cometary, or "blister", morphology are more likely to show evidence of triggering.2012AJ....144..173Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/173CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)VIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989)J/MNRAS/424/2442 : Catalog of bubbles from Milky Way Project (Simpson+, 2012)J/ApJ/741/110 : The BGPS. VII. Massive star-forming regions (Dunham+, 2011)J/ApJ/690/706 : Distances of Galactic HII regions (Anderson+, 2009)J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)J/ApJ/688/1142 : Star formation in W5: Spitzer observations (Koenig+, 2008)J/ApJ/670/428 : Bubbles in the galactic disk. II. (Churchwell+, 2007)J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)J/AJ/131/2525 : MAGPIS 20cm survey (Helfand+, 2006)J/MNRAS/301/640 : Ultracompact H II regions studies. II. (Walsh+, 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/173https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/173http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/173https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/173https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/173http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/173GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/144/173/table1 (HII region sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/173/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/173/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/173/table1?GETtext/xml+votable180.050000true281.184583-3.7594440.005555555555555556Cone search capability for table J/AJ/144/173/table4 (Young Stellar Objects (YSOs) identified by SED fitting)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/173/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/173/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/173/table4?GETtext/xml+votable180.050000true281.132-3.92310.005555555555555556Cone search capability for table J/AJ/144/173/table6 (Molecular gas clump parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/173/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/173/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/173/table6?GETtext/xml+votable180.050000true281.2096-3.74180.0055555555555555566/30256 30258 30595 30598 30601 30604 30617 30618 30619https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/144/173?format=asciidefaultJ/AJ/144/173/table1HII region samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionNearest HII region in this sample (G1)src.sample;obs.fieldcharONameHII region identifier in Churchwell et al. (2006, cat. J/ApJ/649/759)meta.id;obs.fieldcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainTypePrinciple morphology (bubble or cometary)src.morphcharRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatr_RVSource of RV (1)meta.ref;pos.framecharDist1Near kinematic distance (2)kpcpos.distance;pos.heliocentricfloatDist2Far kinematic distance (2)kpcpos.distance;pos.heliocentricfloatHIINearest HII region short name (added at CDS) (G1)obs.fieldcharprimarySimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/144/173/table4Young Stellar Objects (YSOs) identified by SED fittingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIINearest HII region in this sample (G1)src.sample;obs.fieldcharr_YSO[GM] Origin of the YSO (G=GLIMPSE) (1)meta.ref;pos.framecharYSOYSO name (LLL.llll+BB.bbbb)meta.id;meta.maincharStEvolutionary stage (I, II or III) (2)src.classnullablechi2Best-fit parameter ({chi}^2^_best_/n_data_)stat.fit.chi2floatf24Presence of a 24{mu}m point source? (Y or N)meta.codecharMassMass of central source (3)solMassphys.massfloate_MassUncertainty in Mass (3)solMassstat.error;phys.massfloatlogLLog of total luminositylog(solLum)phys.luminosityfloate_logL? Log of uncertainty in logL (4)log(solLum)stat.errorfloatnullablelogMe? Log of envelope accretion rate (5)log(solMass.yr**-1)phys.mass.lossfloatnullablee_logMe[-9.5/-3.3]? Log of uncertainty in logMe (5)log(solMass.yr**-1)stat.errorfloatnullablelogMdLog of accretion disk masslog(solMass)phys.massfloate_logMd[-4.1/-0.8]? Log of uncertainty in logMd (4)log(solMass)stat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition, derived from YSO position (right ascension part)degpos.eq.ra;meta.main_DEPosition, derived from YSO position (declination part)degpos.eq.dec;meta.mainJ/AJ/144/173/table6Molecular gas clump parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIINearest HII region in this sample (G1)src.sample;obs.fieldcharm_HIIMultiplicity flag on HII (1)meta.code.multipcharGLONGalactic longitude of peak (l_peak_)degpos.galactic.lonGLATGalactic latitude of peak (b_peak_)degpos.galactic.latRVRadial velocity of peak (v_peak_)km/sphys.veloc;pos.heliocentricfloatRadClump effective radius (R_cl_)pcphys.size.radiusfloatsigmaClump velocity dispersion ({sigma}_cl_)km/sphys.veloc.dispersionfloatSepClump nearest neighbor (peak-to-peak) separation in the plane of the sky (d_cl_)pcpos.distance;phys.size;obs.fieldfloatNH2Peak column density of the molecular gas for the clump (N_cl_(H_2_)) (see Equation (4) in Section 2.4)1e+21cm**-2phys.columnDensity;stat.maxfloat<nH2>Average number density of the gas for the clump (n_cl_(H_2_))cm**-3meta.id;meta.mainintMclTotal mass in molecular gas for the clump (M_cl_(H_2_)) (see Eq. (5) in Section 2.4)solMassphys.massintalphaVirial parameter ({alpha}_vir_) (2)phys.mass;arith.ratiofloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed