J/ApJS/254/14ivo://CDS.VizieR/J/ApJS/254/14doi:10.26093/cds/vizier.22540014CDSYi H.-W.Lee J.-E.Kim K.-T.Liu T.Lim B.Tatematsu K.2023-08-16T16:07:31Z2021-08-13T13:44:38ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediumstar-forming-regionsyoung-stellar-objectsradio-astronomymillimeter-astronomysubmillimeter-astronomymolecular-physicsMassive stars have a strong impact on their local environments. However, how stellar feedback regulates star formation is still under debate. In this context, we studied the chemical properties of 80 dense cores in the Orion molecular cloud complex composed of the Orion A (39 cores), B (26 cores), and {lambda} Orionis (15 cores) clouds using multiple molecular line data taken with the Korean Very Long Baseline Interferometry Network 21m telescopes. The {lambda} Orionis cloud has an HII bubble surrounding the O-type star {lambda} Ori, and hence it is exposed to the ultraviolet (UV) radiation field of the massive star. The abundances of C_2_H and HCN, which are sensitive to UV radiation, appear to be higher in the cores in the {lambda} Orionis cloud than in those in the Orion A and B clouds, while the HDCO to H_2_CO abundance ratios show the opposite trend, indicating warmer conditions in the {lambda} Orionis cloud. The detection rates of dense gas tracers such as the N_2_H^+^, HCO^+^, and H^13^CO^+^ lines are also lower in the {lambda} Orionis cloud. These chemical properties imply that the cores in the {lambda} Orionis cloud are heated by UV photons from {lambda} Ori. Furthermore, the cores in the {lambda} Orionis cloud do not show any statistically significant excess in the infall signature of HCO^+^ (1-0), unlike those in the Orion A and B clouds. Our results support the idea that feedback from massive stars impacts star formation in a negative way by heating and evaporating dense materials, as in the {lambda} Orionis cloud.2021ApJS..254...14Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/254/14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/328 : AllWISE Data Release (Cutri+ 2013)J/AJ/118/2409 : VRI photometry of {lambda} Ori PMS stars (Dolan+, 1999)J/A+A/357/1001 : The {lambda}-Orionis ring in CO (Lang+ 2000)J/AJ/123/387 : VRI phot. of {lambda} Ori star-forming region (Dolan+, 2002)J/ApJS/155/149 : CH_3_OH 7_0_-6_1_ A^+^ maser sources (Kurtz+, 2004)J/AJ/128/805 : Low-mass stars in Cepheus OB2 region (Sicilia-Aguilar+ 2004)J/A+A/426/503 : Cat. of high velocity molecular outflows (Update) (Wu+ 2004)J/ApJ/665/1194 : Dense cores in the Orion A cloud survey (Ikeda+, 2007)J/ApJ/688/1142 : Star formation in W5: Spitzer observations (Koenig+, 2008)J/ApJ/702/1615 : CH_3_OH maser survey of EGOs (Cyganowski+, 2009)J/ApJ/722/1226 : IR photometry in {lambda} Orionis cluster (Hernandez+, 2010)J/MNRAS/426/2917 : X-rays sources in Trumpler 37 (Getman+, 2012)J/ApJS/202/4 : Planck cold clumps survey in the Orion complex (Liu+, 2012)J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO cat. (Megeath+, 2012)J/ApJ/756/60 : A 3mm line survey in 37 IR dark clouds (Sanhueza+, 2012)J/A+A/560/A73 : Horsehead H2CO and CH3OH 30m and PdBI maps (Guzman+, 2013)J/ApJ/767/36 : APEX observations of HOPS protostars (Stutz+, 2013)J/MNRAS/443/454 : UBVIH{alpha} photometry in NGC 1893 (Lim+, 2014)J/MNRAS/439/2584 : Southern methanol masers at 36 and 44GHz (Voronkov+, 2014)J/A+A/575/A87 : Deuteration in massive star formation (Fontani+, 2015)J/MNRAS/450/1926 : Infall motions in massive star-forming regions (He+, 2015)J/ApJS/224/5 : Herschel Orion Protostar Survey (HOPS): SEDs (Furlan+, 2016)J/A+A/594/A28 : Planck Cat. of Galactic cold clumps (PGCC) (Planck+, 2016)J/ApJ/820/37 : HCO+ & HCN obs. toward PGCCs (Yuan+, 2016)J/ApJ/834/142 : Gould's Belt Distances Survey. II. OMC (Kounkel+, 2017)J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)J/MNRAS/477/1993 : NGC 1893 stars LSR velocities (Lim+, 2018)J/ApJS/236/51 : PGCCs in lambda Orionis. II. Cores at 850um (Yi+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/254/14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/254/14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/254/14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/254/14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/254/14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/254/14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/254/14/cores (Line properties (Tables 2 and 3), spectral line velocities, line assymmetry and infall rate (Table 10) and column densitities (Table 12) for the 80 cores toward {lambda} Orionis, Orion A and B)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/14/cores?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/14/cores?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/14/cores?GETtext/xml+votable180.050000true79.75462513.13493890.0055555555555555566/21396-21397 21430 21436 21438 22805 22807 22854-22855 22861 22873 23561 23563 23590 23597 23697 23704 23738-23739 24077https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/254/14?format=asciiMillimeterRadiodefaultJ/ApJS/254/14/coresLine properties (Tables 2 and 3), spectral line velocities, line assymmetry and infall rate (Table 10) and column densitities (Table 12) for the 80 cores toward {lambda} Orionis, Orion A and BSimbadNameSimbad column added by the CDSmeta.idcharnullableH13CO+[0.2/7.9]? H^13^CO^+^ column density1e+12cm**-2phys.columnDensityfloatnullableHCN[2.6/109.5]? HCN column density1e+12cm**-2phys.columnDensityfloatnullableC2H[0.8/31.1]? C_2_H column density1e+14cm**-2phys.columnDensityfloatnullableH2CO[0.28/28.8]? H_2_CO column density1e+13cm**-2phys.columnDensityfloatnullableHDCO[0.38/11.6]? HDCO column density1e+12cm**-2phys.columnDensityfloatnullableH230[0.2/28.4] H_2_ column density over 30 arcsec (1)1e+22cm**-2phys.columnDensityfloatH220[1.2/51.8] H_2_ column density over 20 arcsec (2)1e+22cm**-2phys.columnDensityfloat_RAPositions from Paper II (Yi+, 2018, J/ApJS/236/51) (right ascension part)degpos.eq.ra;meta.main_DEPositions from Paper II (Yi+, 2018, J/ApJS/236/51) (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloudCloud identifiermeta.id.parentCoreCore identifiermeta.id;meta.maincharTpeak1[0.15/1.63]? The H^13^CO^+^ peak temperatureKphys.temperaturefloatnullableVLSR1[1.3/13.5]? The H^13^CO^+^ Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFWHM1[0.3/2.4]? The H^13^CO^+^ Full-Width at Half Maximumkm/sspect.line.widthfloatnullableTpeak2[0.09/1.1]? The C_2_H peak temperatureKphys.temperaturefloatnullableVLSR2[1.5/13.7]? The C_2_H Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFWHM2[0.04/2.2]? The C_2_H Full-Width at Half Maximumkm/sspect.line.widthfloatnullableTpeak3[0.1/7.7]? The HCN peak temperatureKphys.temperaturefloatnullableVLSR3[1.6/13.8]? The HCN Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFWHM3[0.3/4.1]? The HCN Full-Width at Half Maximumkm/sspect.line.widthfloatnullableTpeak4[0.26/4.9]? The HCO^+^ peak temperatureKphys.temperaturefloatnullableVLSR4[1.2/14.4]? The HCO^+^ Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFWHM4[0.19/4]? The HCO^+^ Full-Width at Half Maximumkm/sspect.line.widthfloatnullableTpeak5[0.1/2.91]? The N_2_H^+^ peak temperatureKphys.temperaturefloatnullableVLSR5[0.3/12.5]? The N_2_H^+^ Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFWHM5[0.2/1.4]? The N_2_H^+^ Full-Width at Half Maximumkm/sspect.line.widthfloatnullableTpeak6[0.08/0.6]? The HDCO peak temperatureKphys.temperaturefloatnullableVLSR6[1.4/14.4]? The HDCO Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFWHM6[0.27/1.5]? The HDCO Full-Width at Half Maximumkm/sspect.line.widthfloatnullableTpeak7[0.13/2.1]? The H_2_CO peak temperatureKphys.temperaturefloatnullableVLSR7[1.3/13.9]? The H_2_CO Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFWHM7[0.4/2.92]? The H_2_CO Full-Width at Half Maximumkm/sspect.line.widthfloatnullableVthick[1.2/14.4]? Peak velocity of an optically thick linekm/sspect.dopplerVelocfloatnullableVthin[1.3/13.5]? Peak velocity of an optically thin linekm/sspect.dopplerVelocfloatnullableDelVthin[0.3/2.4]? Line width of the optically thin linekm/sspect.line.widthfloatnullabledeltav[-22/1.1]? The (Vthick-Vthin)/DelVthin valuestat.fit.omcfloatnullableProfileProfile line asymmetry typemeta.notechardM/dt[2.9/139]? Infall rate1e-06solMass.yr**-1arith.ratefloatnullableYSOAssociated YSOmeta.notecharN2H+[0.37/34.3]? N_2_H^+^ column density1e+12cm**-2phys.columnDensityfloatnullableHCO+[0.4/165.2]? HCO^+^ column density1e+12cm**-2phys.columnDensityfloatnullable