J/ApJ/830/127ivo://CDS.VizieR/J/ApJ/830/127doi:10.26093/cds/vizier.18300127CDSStorm S.Mundy L.G.Lee K.I.Fernandez-Lopez M.Looney L.W.Teuben P.,Arce H.G.Rosolowsky E.W.Meisner A.M.Isella A.Kauffmann J.,Shirley Y.L.Kwon W.Plunkett A.L.Pound M.W.Segura-Cox D.M.,Tassis K.Tobin J.J.Volgenau N.H.Crutcher R.M.Testi L.2017-05-29T08:04:29Z2017-02-20T09:59:48ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediumgalaxy-kinematicsmillimeter-astronomysubmillimeter-astronomyinterferometryWe present a 3mm spectral line and continuum survey of L1451 in the Perseus Molecular Cloud. These observations are from the CARMA Large Area Star Formation Survey (CLASSy), which also imaged Barnard 1, NGC1333, Serpens Main, and Serpens South. L1451 is the survey region with the lowest level of star formation activity-it contains no confirmed protostars. HCO^+^, HCN, and N_2_H^+^ (J=1->0) are all detected throughout the region, with HCO^+^ being the most spatially widespread, and molecular emission seen toward 90% of the area above N(H_2_) column densities of 1.9x10^21^cm^-2^. HCO^+^ has the broadest velocity dispersion, near 0.3km/s on average, compared with ~0.15km/s for the other molecules, thus representing a range of subsonic to supersonic gas motions. Our non-binary dendrogram analysis reveals that the dense gas traced by each molecule has a similar hierarchical structure, and that gas surrounding the candidate first hydrostatic core (FHSC), L1451-mm, and other previously detected single-dish continuum clumps has similar hierarchical structure; this suggests that different subregions of L1451 are fragmenting on the pathway to forming young stars. We determined that the three-dimensional morphology of the largest detectable dense-gas structures was relatively ellipsoidal compared with other CLASSy regions, which appeared more flattened at the largest scales. A virial analysis shows that the most centrally condensed dust structures are likely unstable against collapse. Additionally, we identify a new spherical, centrally condensed N_2_H^+^ feature that could be a new FHSC candidate. The overall results suggest that L1451 is a young region starting to form its generation of stars within turbulent, hierarchical structures.2016ApJ...830..127Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/830/127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/819/143 : HCO+ and N2D+ dense cores in Perseus (Campbell+, 2016)J/MNRAS/402/603 : Properties of SCUBA cores in Perseus (Curtis+, 2010)J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)J/ApJ/684/1240 : Prestellar cores in Perseus, Serpens & Oph. (Enoch+, 2008)J/A+A/487/993 : MAMBO Mapping of c2d Clouds and Cores (Kauffmann+, 2008)J/ApJ/683/822 : Star formation in Ophiuchus & Perseus. II. (Jorgensen+, 2008)J/ApJS/175/509 : Ammonia spectral atlas in Perseus (Rosolowsky+, 2008)J/ApJ/646/1009 : Structures of dust in Perseus molecular cloud (Kirk+, 2006)J/ApJ/638/293 : 1.1mm sources in the Perseus Molecular Cloud (Enoch+, 2006)J/A+A/440/151 : Observations at 850um in Perseus clusters (Hatchell+, 2005)http://admit.astro.umd.edu/classy/ : CLASSy home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/830/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/830/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/830/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/830/127https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/830/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/830/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/830/127/table4 (HCO+ dendrogram leaf and branch properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/830/127/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/830/127/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/830/127/table4?GETtext/xml+votable180.050000true51.17208330.4351110.005555555555555556Cone search capability for table J/ApJ/830/127/table5 (HCN dendrogram leaf and branch properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/830/127/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/830/127/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/830/127/table5?GETtext/xml+votable180.050000true51.37958330.3711110.005555555555555556Cone search capability for table J/ApJ/830/127/table6 (N_2_H+ dendrogram leaf and branch properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/830/127/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/830/127/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/830/127/table6?GETtext/xml+votable180.050000true51.37833330.357750.0055555555555555566/858https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/830/127?format=asciiRadiodefaultJ/ApJ/830/127/table4HCO+ dendrogram leaf and branch propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeDendrogram type ("Branch" or "Leaf")meta.notecharSeq[0/112] Source index numbermeta.id;meta.mainintRAJ2000[3] Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000[30] Degree of Declination (J2000) (1)pos.eq.dec;meta.mainamaj[13/776] Major axis(1)arcsecphys.angSizefloatbmin[6/269] Minor axis(1)arcsecphys.angSize;srcfloatPAPosition angle (1)degpos.posAngfloatb/aAxis ratio; bmin/amajphys.angSize;arith.ratiofloatFFFilling factor (2)stat.fit.omcfloatSize[0.01/0.5] Size (3)pcsrc.morph.scLengthfloat<VLSR>[3.3/5.1]? Weighted mean Local Standard of Rest velocity (4)km/sphys.veloc;pos.lsrfloatnullablee_<VLSR>[1/8]? Uncertainty in <VLSR>0.01km.s**-1stat.error;phys.veloc;pos.lsrintnullableDelVLSR[0.02/0.3]? Weighted standard deviation of all fitted V_LSR_ values (5)km/sstat.stdev;phys.veloc;phys.atmol.wOscStrengthfloatnullablee_DelVLSR[0/6]? Uncertainty in DelVLSR0.01km.s**-1stat.errorintnullable<sig>[0.07/0.5]? Weighted mean velocity dispersionkm/sphys.veloc.dispersionfloatnullablee_<sig>[0/9]? Uncertainty in <sig> (6)0.01km.s**-1stat.errorintnullableDelsig[0.01/0.2]? Weighted standard deviation of all fitted velocity dispersion valueskm/sstat.stdev;phys.veloc.dispersion;meta.modelledfloatnullablee_Delsig[0/7]? Uncertainty in Delsig (7)0.01km.s**-1stat.errorintnullablePInt[0.3/2.8] Peak intensity (8)Jy/beamphot.flux.density;em.mm.50-100GHzfloatCtst[2/10]? Contrast (9)phot.flux;arith.ratiofloatnullableLevel[0/7] Branching level in the dendrogram (10)meta.numberintJ/ApJ/830/127/table5HCN dendrogram leaf and branch propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeDendrogram type ("Branch" or "Leaf")meta.notecharSeq[0/112] Source index numbermeta.id;meta.mainintRAJ2000[3] Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000[30] Degree of Declination (J2000) (1)pos.eq.dec;meta.mainamaj[13/776] Major axis(1)arcsecphys.angSizefloatbmin[6/269] Minor axis(1)arcsecphys.angSize;srcfloatPAPosition angle (1)degpos.posAngfloatb/aAxis ratio; bmin/amajphys.angSize;arith.ratiofloatFFFilling factor (2)stat.fit.omcfloatSize[0.01/0.5] Size (3)pcsrc.morph.scLengthfloat<VLSR>[3.3/5.1]? Weighted mean Local Standard of Rest velocity (4)km/sphys.veloc;pos.lsrfloatnullablee_<VLSR>[1/8]? Uncertainty in <VLSR>0.01km.s**-1stat.error;phys.veloc;pos.lsrintnullableDelVLSR[0.02/0.3]? Weighted standard deviation of all fitted V_LSR_ values (5)km/sstat.stdev;phys.veloc;phys.atmol.wOscStrengthfloatnullablee_DelVLSR[0/6]? Uncertainty in DelVLSR0.01km.s**-1stat.errorintnullable<sig>[0.07/0.5]? Weighted mean velocity dispersionkm/sphys.veloc.dispersionfloatnullablee_<sig>[0/9]? Uncertainty in <sig> (6)0.01km.s**-1stat.errorintnullableDelsig[0.01/0.2]? Weighted standard deviation of all fitted velocity dispersion valueskm/sstat.stdev;phys.veloc.dispersion;meta.modelledfloatnullablee_Delsig[0/7]? Uncertainty in Delsig (7)0.01km.s**-1stat.errorintnullablePInt[0.3/2.8] Peak intensity (8)Jy/beamphot.flux.density;em.mm.50-100GHzfloatCtst[2/10]? Contrast (9)phot.flux;arith.ratiofloatnullableLevel[0/7] Branching level in the dendrogram (10)meta.numberintJ/ApJ/830/127/table6N_2_H+ dendrogram leaf and branch propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeDendrogram type ("Branch" or "Leaf")meta.notecharSeq[0/112] Source index numbermeta.id;meta.mainintRAJ2000[3] Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000[30] Degree of Declination (J2000) (1)pos.eq.dec;meta.mainamaj[13/776] Major axis(1)arcsecphys.angSizefloatbmin[6/269] Minor axis(1)arcsecphys.angSize;srcfloatPAPosition angle (1)degpos.posAngfloatb/aAxis ratio; bmin/amajphys.angSize;arith.ratiofloatFFFilling factor (2)stat.fit.omcfloatSize[0.01/0.5] Size (3)pcsrc.morph.scLengthfloat<VLSR>[3.3/5.1]? Weighted mean Local Standard of Rest velocity (4)km/sphys.veloc;pos.lsrfloatnullablee_<VLSR>[1/8]? Uncertainty in <VLSR>0.01km.s**-1stat.error;phys.veloc;pos.lsrintnullableDelVLSR[0.02/0.3]? Weighted standard deviation of all fitted V_LSR_ values (5)km/sstat.stdev;phys.veloc;phys.atmol.wOscStrengthfloatnullablee_DelVLSR[0/6]? Uncertainty in DelVLSR0.01km.s**-1stat.errorintnullable<sig>[0.07/0.5]? Weighted mean velocity dispersionkm/sphys.veloc.dispersionfloatnullablee_<sig>[0/9]? Uncertainty in <sig> (6)0.01km.s**-1stat.errorintnullableDelsig[0.01/0.2]? Weighted standard deviation of all fitted velocity dispersion valueskm/sstat.stdev;phys.veloc.dispersion;meta.modelledfloatnullablee_Delsig[0/7]? Uncertainty in Delsig (7)0.01km.s**-1stat.errorintnullablePInt[0.3/2.8] Peak intensity (8)Jy/beamphot.flux.density;em.mm.50-100GHzfloatCtst[2/10]? Contrast (9)phot.flux;arith.ratiofloatnullableLevel[0/7] Branching level in the dendrogram (10)meta.numberint