J/A+A/636/A67ivo://CDS.VizieR/J/A+A/636/A67doi:10.26093/cds/vizier.36360067CDSAllen V.van der Tak F.F.S.Lopez-Sepulcre A.Sanchez-Monge A.,Rivilla V.M.Cesaroni R.2020-08-21T09:37:46Z2020-04-20T08:21:15ZCDS support team

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

cds-question@unistra.frstar-forming-regionso-starsinterstellar-mediuminterferometryspectroscopyastronomical-modelschemical-abundancesAs a building block for amino acids, formamide (NH_2_CHO) is an important molecule in astrobiology and astrochemistry, but its formation path in the interstellar medium is not understood well. We aim to find empirical evidence to support the chemical relationships of formamide to HNCO and H_2_CO. We examine high angular resolution (~0.2") Atacama Large Millimeter/submillimeter Array (ALMA) maps of six sources in three high-mass star-forming regions and compare the spatial extent, integrated emission peak position, and velocity structure of HNCO and H_2_CO line emission with that of NH_2_CHO by using moment maps. Through spectral modeling, we compare the abundances of these three species. In these sources, the emission peak separation and velocity dispersion of formamide emission is most often similar to HNCO emission, while the velocity structure is generally just as similar to H_2_CO and HNCO (within errors). From the spectral modeling, we see that the abundances between all three of our focus species are correlated, and the relationship between NH_2_CHO and HNCO reproduces the previously demonstrated abundance relationship. In this first interferometric study, which compares two potential parent species to NH_2_CHO, we find that all moment maps for HNCO are more similar to NH_2_CHO than H_2_CO in one of our six sources (G24 A1). For the other five sources, the relationship between NH_2_CHO, HNCO, and H_2_CO is unclear as the different moment maps for each source are not consistently more similar to one species as opposed to the other.2020A&A...636A..67Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/636/A67CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/636/A67https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/636/A67http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/636/A67https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/636/A67https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/636/A67http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/636/A67GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/636/A67/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/636/A67/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/636/A67/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/636/A67/list?GETtext/xml+votable180.050000true275.60977-13.503270.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/636/A676/29504 30218 42398https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/636/A67?format=asciidefaultJ/A+A/636/A67/listList of fits filesrecnoRecord 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 pixels along Z-axismeta.numberintnullableObs.dateObservation datestime.epoch;obsnullableFreq? Observed frequency or lower value of observed frequency for the datacubesGHzem.freqfloatnullableBFreq? Upper value of observed frequency for the datacubesGHzem.freq;stat.maxfloatnullabledFreq? Frequency resolution for the datacubesHzspect.resolutionintnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitsAssocDataAssociated Data web pagemeta.ref.urlchar