J/A+A/688/A118ivo://CDS.VizieR/J/A+A/688/A118doi:10.26093/cds/vizier.36880118CDSLin S.-J.Lai S.-P.Pagani L.Lefevre C.Thieme J.T.2024-11-21T20:02:27Z2024-08-13T07:29:55ZCDS support team

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

cds-question@unistra.frinterstellar-mediummolecular-cloudsinfrared-astronomyMolecular deuteration is commonly seen in starless cores and is expected to occur on a timescale comparable to that of the core contraction. Thus, the deuteration serves as a chemical clock, allowing us to investigate dynamical theories of core formation. We aim to provide a 3D cloud description for the starless core L 1498 located in the nearby low-mass star-forming region Taurus and explore its possible core formation mechanism. We carried out nonlocal thermal equilibrium radiative transfer with multi-transition observations of the high-density tracer N_2_H+ to derive the density and temperature profiles of the L 1498 core. By combining these observations with the spectral observations of the deuterated species, ortho-H_2_D+, N_2_D+, and DCO+, we derived the abundance profiles for the observed species and performed chemical modeling of the deuteration profiles across L 1498 to constrain the contraction timescale. We present the first ortho-H_2_D+ (110-111) detection toward L 1498. We find a peak molecular hydrogen density of 1.6_-0.3_^+3.0^x10^5^cm^-3^, a temperature of 7.5_-0.5_^+0.7^K, and a N_2_H+ deuteration of 0.27_-0.15_^+0.12^ in the center. We derived a lower limit of the core age for L 1498 of 0.16Ma, which is compatible with the typical free-fall time, indicating that L 1498 likely formed rapidly.2024A&A...688A.118Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/688/A118CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/688/A118https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/688/A118http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/688/A118https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/688/A118https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/688/A118http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/688/A118GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/688/A118/list (List of of CFHT fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/688/A118/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/688/A118/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/688/A118/list?GETtext/xml+votable180.050000true62.6982325.151710.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/688/A1180/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/688/A118?format=asciiInfrareddefaultJ/A+A/688/A118/listList of of CFHT fits imagesTitleTitle of the FITS filemeta.title;meta.fitscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainscaleScale of the imagearcsec/pixinstr.scalefloatNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitschar