J/A+A/606/A142ivo://CDS.VizieR/J/A+A/606/A142doi:10.26093/cds/vizier.36060142CDSChacon-Tanarro A.Caselli P.Bizzocchi L.Pineda J.E.Harju J.,Spaans M.Desert F.-X.2017-11-02T12:01:30Z2017-10-26T08:43:36ZCDS support team

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

cds-question@unistra.frradio-continuum-emissionmolecular-cloudsIn dense and cold molecular clouds dust grains are surrounded by thick icy mantles. It is however not clear if dust growth and coagulation take place before the switch-on of a protostar. This is an important issue, as the presence of large grains may affect the chemical structure of dense cloud cores, including the dynamically important ionization fraction, and the future evolution of solids in protoplanetary disks. To study this further, we focus on L1544, one of the most centrally concentrated pre-stellar cores on the verge of star formation, and with a well-known physical structure. We observed L1544 at 1.2 and 2mm using NIKA, a new receiver at the IRAM 30 m telescope, and we used data from the Herschel Space Observatory archive. We find no evidence of grain growth towards the center of L1544 at the available angular resolution. Therefore, we conclude that single dish observations do not allow us to investigate grain growth towards the pre-stellar core L1544 and high sensitivity interferometer observations are needed. We predict that dust grains can grow to 200um in size toward the central ~300au of L1544. This will imply a dust opacity change by a factor of ~2.5 at 1.2mm, which can be detected using the Atacama Large Millimeter and submillimeter Array (ALMA) at different wavelengths and with an angular resolution of 2".2017A&A...606A.142Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/606/A142CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/555/A109 : ^14^N/^15^N isotopic ratio in L1544 (Bizzocchi+, 2013)J/A+A/606/A82 : Observed chemical structure of L1544 (Spezzano+, 2017)J/ApJ/833/176 : The magnetic field of L1544. I. NIR data (Clemens+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/606/A142https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/606/A142http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/606/A142https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/606/A142https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/606/A142http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/606/A142GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/606/A142/list (List of fitd maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/606/A142/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/606/A142/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/606/A142/list?GETtext/xml+votable180.050000true76.0639625.185280.0055555555555555566/24300https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/606/A142?format=asciiRadiodefaultJ/A+A/606/A142/listList of fitd mapsrecnoRecord 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.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar