J/A+A/666/A191ivo://CDS.VizieR/J/A+A/666/A191doi:10.26093/cds/vizier.36660191CDSWakelam V.Coutens A.Gratier P.Vidal T.H.G.Vaytet N.2024-11-28T20:00:59Z2022-10-28T09:24:26ZCDS support team

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

cds-question@unistra.frinterstellar-mediumastrophysical-masersradio-astronomyThe observational counterpart of theoretically predicted first hydrostatic cores (FHSC) have been hunted in the interstellar medium for nearly two decades now. Distinguishing them from other types of more evolved but still embedded objects remains a challenge as these objects have a short lifetime, are small, and embedded in a dense cocoon. One possible lead is through the characterization of outflows launched by these objects, which are supposed to be low velocity and small in extent. We observed the L1451-mm FHSC candidate with the NOEMA interferometer (and complementary IRAM 30m data) in order to study the emission of several molecules. Among the targeted molecules, we detected lines of c-C_3_H_2_, CH_3_OH, CS, C^34^S, SO, DCN, DCO+, H_2_CO, HC_3_N, HDCO, and SiO. One of the methanol lines appear to be a maser line. Both the detection of this Class I maser and SiO line in L1451- mm support the presence of low velocity and compact outflow. The excitation conditions of the thermal lines of methanol are also compatible with shocks (H_2_ density of ~3{AA}*10^6^cm^-3^ and temperature larger than 40K). Although the presence of such low velocity outflow is theoretically predicted by some models of FHSC, these models also predict the shock temperature to be below 20K, i.e. not evaporating methanol. In addition, the predicted velocities would not erode the grains and release silicon in the gas-phase. We then conclude that these new observations favor the hypothesis that L1451- mm would be at a very early proto-stellar stage launching an outflow nearly on the plan of the sky with a higher velocity that what is observed.2022A&A...666A.191Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A191CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A191https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A191http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A191https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A191https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A191http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A191GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/666/A191/list (List of fits datacubes and images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A191/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A191/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A191/list?GETtext/xml+votable180.050000true51.2924730.398620.0055555555555555566/858https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/666/A191?format=asciiRadiodefaultJ/A+A/666/A191/listList of fits datacubes and imagesrecnoRecord 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.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNz? Number of slicesmeta.numberintnullablebVRAD? Lower value of VRAD interval for the datacubesm/sphys.veloc;pos.heliocentricintnullableBVRAD? Upper value of VRAD interval for the datacubesm/sphys.veloc;pos.heliocentricintnullabledVRAD? VRAD resolutionm/sspect.resolutionintnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar