J/ApJ/703/121ivo://CDS.VizieR/J/ApJ/703/121doi:10.26093/cds/vizier.17030121CDSKobayashi H.Kawakita H.2011-11-23T16:55:00Z2011-11-09T14:12:25ZCDS support team

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

cds-question@unistra.frcometsspectroscopyinfrared-astronomyWe observed comet C/2004 Q2 (Machholz) with the Keck II telescope in late 2005 January and we obtained the spectra of C/2004 Q2 including many emission lines of volatile species such as H_2_O, HCN, C_2_H_2_, NH_3_, CH_4_, C_2_H_6_, CH_3_OH, and H_2_CO with high-signal-to-noise ratios. Based on our observations, we determined the mixing ratios of the molecules relative to H_2_O in C/2004 Q2. C/2004 Q2 might be the intermediate type between Oort Cloud and Jupiter Family comets. To investigate the formation conditions of such intermediate type comet, we focused on the (C_2_H_2_+C_2_H_6_)/H_2_O ratios and C_2_H_6_/(C_2_H_6_+C_2_H_2_) ratios in comets from the viewpoint of conversion from C_2_H_2_ to C_2_H_6_ in the precometary ices. We employed the dynamical-evolutional model and the chemical-evolutional model to determine the formation region of C/2004 Q2 more precisely. We found that comet C/2004 Q2 might have formed in relatively inner region of the solar nebula than the typical Oort Cloud comet (but slightly further than 5AU from the proto-Sun).2009ApJ...703..121Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/121CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/169/458 : Highly excited H2 in Comets (Liu+, 2007)J/PAZh/30/946 : Unidentified cometary emission lines (Simonia, 2004)J/A+A/393/1053 : 18-cm OH lines in comets (Crovisier+, 2002)J/AJ/112/1197 : Catalog of cometary emission lines (Brown+ 1996)J/A+AS/103/83 : Line identifications in a fireball spectrum (Borovicka 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/703/121https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/703/121http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/703/121https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/703/121https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/703/121http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/703/121GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/703/121/table1Line fluxes and g-factors including transmittancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMolMolecule namemeta.id;phys.molcharf_Line[a-z ] Indicator of blended line (1)meta.codecharLineLine assignment (3)meta.id;phys.atmol.transitioncharsigmaRest wave numbercm**-1em.wavenumberfloatFSet1? Line flux of Set 1 (2)W.m**-2phot.fluxdoublenullableFSet2? Line flux of Set 2 (2)W.m**-2phot.fluxdoublenullableFSet3? Line flux of Set 3 (2)W.m**-2phot.fluxdoublenullablegSet1? g-factor of Set 1 (emission efficiency)W/sphys.atmol.collisionaldoublenullablegSet2? g-factor of Set 2 (emission efficiency)W/sphys.atmol.collisionaldoublenullablegSet3? g-factor of Set 3 (emission efficiency)W/sphys.atmol.collisionaldoublenullable