J/AJ/168/52ivo://CDS.VizieR/J/AJ/168/52doi:10.26093/cds/vizier.51680052CDSYu S.Jiang Z.Chen Z.Yang Y.Feng H.2025-02-12T20:07:58Z2024-10-11T13:23:51ZCDS support team

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

cds-question@unistra.frmolecular-cloudsradio-astronomyinterstellar-mediumWe have carried out HCO+(J=1-0) and HCN(J=1-0) line observations towards 210 infall candidates selected from the CO blue-profile catalog by Jiang+ 2023RAA....23g5001J, using the Purple Mountain Observatory 13.7m telescope. Out of the 210 targets, 42 sources are further confirmed to have infall signatures in HCO+ and/or HCN lines, with a confirmation rate of ~20%. According to the line profiles, we classify them into two categories: double-peaked and peak-shoulder. Some physical properties are estimated through profile fitting using the RATRAN model. We find that the two types are separated in parameter space, indicating they may be of different properties. The median values of kinetic temperature, infall velocity, and mass infall rate for the two types are 10.5K and 40.8K, 0.40km/s and 1.00km/s, and 4.6x10^-5^M_{sun}_/yr and 3.5x10^-4^M_{sun}_/yr, respectively. The infall velocities and mass-infall rates of peak-shoulder sources are slightly larger than those of double-peaked ones, suggesting they tend to form more massive stars. We also discuss the association of the 42 confirmed sources with other star formation activities such as maser and outflow, which supports this result.2024AJ....168...52Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/52CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/7 : Lynds' Catalogue of Dark Nebulae (LDN) (Lynds 1962)J/A+AS/58/197 : 11cm survey, 357.4<=l<=76, -1.5<=b<=1.5 (Reich+, 1984)J/A+AS/101/153 : Galactic H2O masers (Palagi+ 1993)J/MNRAS/276/57 : IRAS Galactic star-forming regions. II. (Codella+ 1995)J/ApJ/463/205 : CS and NH3 Survey of H2O Maser Emission (Anglada+ 1996)J/ApJS/110/21 : Molecular clouds in Cepheus & Cassiopeia (Yonekura+ 1997)J/A+AS/132/211 : Interstellar SiO sources (Harju+ 1998)J/ApJ/526/788 : Infall motions toward starless cores (Lee+, 1999)J/A+AS/143/269 : 6.7GHz methanol maser emission survey (Szymczak+, 2000)J/A+A/368/845 : Arcetri Cat. of H2O maser sources. (Valdettaro+, 2001)J/A+A/413/233 : 12.2 GHz methanol survey (Blaszkiewicz+, 2004)J/A+A/458/789 : ISOCAM survey of Serpens/G3-G6 (Djupvik+, 2006)J/A+A/453/911 : VLA and IR obs. of the S235A-B region (Felli+, 2006)J/PASJ/59/1185 : Water maser in galactic IRAS sources (Sunada+, 2007)J/A+A/487/993 : MAMBO Mapping of c2d Clouds and Cores (Kauffmann+, 2008)J/ApJS/184/18 : Spitzer survey of young stellar cl. (Gutermuth+, 2009)J/ApJ/714/L285 : YSO candidates in M17 SWex (Povich+, 2010)J/PASJ/63/S1 : Atlas & cat. of dark clouds from 2MASS (Dobashi+, 2011)J/MNRAS/418/1689 : Red MSX water maser & ammonia emissions (Urquhart+, 2011)J/ApJ/750/125 : Spitzer imaging of Cepheus OB3b cluster (Allen+, 2012)J/MNRAS/431/1752 : ATLASGAL 6.7GHz methanol masers (Urquhart+, 2013)J/MNRAS/435/400 : ATLASGAL. Compact HII regions (Urquhart+, 2013)J/MNRAS/439/3719 : Embedded clusters infrared photometry (Chavarria+, 2014)J/MNRAS/450/1926 : Infall motions in massive star-forming regions (He+, 2015)J/MNRAS/461/2288 : Infall motions in massive star-forming regions (He+, 2016)J/ApJ/833/18 : Compact HII regions & methanol masers. I. (Hu+, 2016)J/A+A/590/A72 : Herschel counterparts of SDC (Peretto+, 2016)J/A+A/594/A28 : Planck Cat. of Galactic cold clumps (PGCC) (Planck+, 2016)J/ApJ/838/80 : JHK polarimetry of stars behind bubble N4 (Chen+, 2017)J/ApJS/231/20 : A new 95GHz methanol maser catalog. I. (Yang+, 2017)J/A+A/620/A158 : IR-dark clumps MALT90 molecular content (Saral+, 2018)J/A+A/628/A90 : OH maser emission in THOR survey (Beuther+, 2019)J/MNRAS/490/2779 : Dust clumps associated with masers (Billington+, 2019)J/MNRAS/485/2895 : The SCOPE 850um compact source catalogue (Eden+, 2019)J/ApJ/884/4 : KEYSTONE: ammonia structures in Gal. GMCs (Keown+, 2019)J/ApJ/885/131 : High-mass SFR plx & proper motion with VLBI (Reid+, 2019)J/A+A/632/A58 : Physical properties of CHIMPS clumps (Rigby+, 2019)J/ApJS/241/18 : 6.7GHz methanol maser survey. II. |b|<2{deg} (Yang+, 2019)J/MNRAS/492/1335 : Star formation and 6.7GHz methanol masers (Paulson+, 2020)J/ApJS/248/18 : 44 and 95GHz obs. of class I methanol masers (Yang+, 2020)J/other/RAA/20.115 : Molecular clumps CO, HCO and HCN data (Yang+, 2020)J/A+A/633/A51 : Distances to molecular clouds in SFR (Zucker+, 2020)J/A+A/666/A59 : GLOSTAR GPS. 6.7GHz Methanol Maser Catalog (Nguyen+, 2022)J/MNRAS/510/3389 : High-mass star formation evolut. trends (Urquhart+, 2022)J/AJ/167/220 : Molecular clouds dist. measurements; MWISP (Zhang+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/52https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/168/52http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/168/52https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/168/52https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/168/52http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/168/52GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/168/52/tablea1 (List of all 210 observed infall candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/168/52/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/168/52/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/168/52/tablea1?GETtext/xml+votable180.050000true269.43375-26.3422220.0055555555555555566/1301 1344 1790 1822 1843 1852 1935 1959 3035 3061 3068 3071 3157 3163 3169 3171 3184 3194-3195 3198 3627-3628 3630 3645 3648-3650 3747 3750 3752 12991 14053 14056 14315 14356 14410 14670 14675 14678 14680 14682-14683 14688 14690 14704 14706 14712 15370 15374 15380 15422 15426-15427 15631 15649 15670 15681-15684 22038 22233 22241 22251 22267 23641 23669 23795 23974 23982 23999 24158 24183 24324 24352 24499 24554 28878 28903 28914 29102-29103 29113 29457 29463-29464 29466 29469 29514 30218 30234-30235 30255 30260 30315 30319 30328 30330 30343 30355-30356 30358-30361 30363 30416-30417 30420-30421 30427-30428 30430 30449 30453 30508 30592-30594 30602 30608-30609 30628 30645 30666 30670 30692 30716 30719 32093https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/168/52?format=asciiRadiodefaultJ/AJ/168/52/tablea1List of all 210 observed infall candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/210] Running sequence numbermeta.idintProfinfall candidate profiles (Table 1)meta.ref.urlintnullableNameSource name (GLLL.ll+B.bb) identified by ^12^CO and ^13^CO unless flaggedmeta.id;meta.maincharprimaryConfconfirmed infall candidates (Table 4)meta.ref.urlintnullablef_NameFlag on Name (1)meta.codecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainVlsr[-49.6/47.1] LSR velocitykm/sphys.veloc;pos.lsrfloatDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainJ/AJ/168/52/table1Line parameters and profiles of 99 infall candidates with HCO+ and HCN emissionProfType of line profile for HCO+(1-0) and HCN(1-0) respectively (R=red; B=blue)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (GLLL.ll+B.bb)meta.id;meta.maincharf_Name[*] *: confirmed to have infall signaturemeta.codecharTHCO[0.13/5]? HCO^+^ peak intensityKphys.temperaturefloatnullableTHCN[0.09/4.8]? HCN peak intensityKphys.temperaturefloatnullableDelVHCO[0.5/5.2]? HCO^+^ line widthkm/sspect.line.widthfloatnullableDelVHCN[0.2/6.4]? HCN line widthkm/sspect.line.widthfloatnullableJ/AJ/168/52/table4Star-forming regions, masers, and outflows associated with further confirmed infall candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/42] Running sequence numbermeta.idintSFRStar forming regionobs.fieldcharHIIHII region?meta.codecharICH_3_OH maser class I?meta.codecharIICH_3_OH maser class II?meta.codecharH2OH_2_O maser?meta.codecharOHOH maser?meta.codecharOutOutflow?meta.codecharEvolEvolution (1)src.classcharRefReference(s) (see refs.dat file)meta.ref;pos.framecharNameSource name (GLLL.ll+B.bb)meta.id;meta.maincharJ/AJ/168/52/refsReferencesRef[1/67] Reference codemeta.noteintAuthFirst author's name(s)meta.bib.authorcharBibCodeBibcode of the referencemeta.bib.bibcodecharCatVizieR catalog referencemeta.id;meta.datasetcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint