J/A+A/605/L3ivo://CDS.VizieR/J/A+A/605/L3doi:10.26093/cds/vizier.36059003CDSCodella C.Ceccarelli C.Caselli P.Balucani N.Baroneinst V.,Fontani F.Lefloch B.Podio L.Viti S.Feng S.Bachiller R.,Bianchi E.Dulieu F.Jimenez-Serra I.Holdship J.Neri R.Pineda J.,Pon A.Sims I.Spezzano S.Vasyunin A.I.Alves F.Bizzocchi L.,Bottinelli S.Caux E.Chacon-Tanarro A.Choudhury R.Coutens A.,Favre C.Hily-Blant P.Kahane C.Jaber Al-Edhari A.Laas J.,Lopez-Sepulcre A.Ospina J.Oya Y.Punanova A.Puzzarini C.,Quenard D.Rimola A.Sakai N.Skouteris D.Taquet V.Testi L.,Theule P.Ugliengo P.Vastel C.Vazart F.Wiesenfeld L.Yamamoto S.2020-06-11T07:11:29Z2017-09-08T07:39:12ZCDS support team

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

cds-question@unistra.frinterstellar-mediuminterferometryModern versions of the Miller-Urey experiment claim that formamide (NH_2_CHO) could be the starting point for the formation of metabolic and genetic macromolecules. Intriguingly, formamide is indeed observed in regions forming Solar-type stars as well as in external galaxies. How NH_2_CHO is formed has been a puzzle for decades: our goal is to contribute to the hotly debated question of whether formamide is mostly formed via gas-phase or grain surface chemistry. We used the NOEMA interferometer to image NH_2_CHO towards the L1157-B1 blue-shifted shock, a well known interstellar laboratory, to study how the components of dust mantles and cores released into the gas phase triggers the formation of formamide. Results. We report the first spatially resolved image (size ~9", ~2300AU) of formamide emission in a shocked region around a Sun-like protostar: the line profiles are blueshifted and have a FWHM~=5km/s. A column density of N(NH_2_CHO)=8x10^12^cm^-1^, and an abundance (with respect to H-nuclei) of 4x10^-9^ are derived. We show a spatial segregation of formamide with respect to other organic species. Our observations, coupled with a chemical modelling analysis, indicate that the formamide observed in L1157-B1 is formed by gas-phase chemical process, and not on grain surfaces as previously suggested. The SOLIS interferometric observations of formamide provide direct evidence that this potentially crucial brick of life is efficiently formed in the gas-phase around Sun-like protostars.2017A&A...605L...3Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/605/L3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/605/A57 : SOLIS. II. OMC2-FIR4 HC_3_N and HC_5_N images (Fontani+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/605/L3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/605/L3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/605/L3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/605/L3https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/605/L3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/605/L3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/605/L3/list (Informations of fits image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/605/L3/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/605/L3/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/605/L3/list?GETtext/xml+votable180.050000true309.7924168.019490.0055555555555555566/15965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/605/L3?format=asciidefaultJ/A+A/605/L3/listInformations of fits imagerecnoRecord 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 filemeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits