J/ApJ/923/240ivo://CDS.VizieR/J/ApJ/923/240doi:10.26093/cds/vizier.19230240CDSSakamoto K.Martin S.Wilner D.J.Aalto S.Evans A.S.Harada N.2023-11-03T13:08:11Z2023-08-01T13:03:40ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleigalaxiesinfrared-sourcesinterstellar-mediumradio-spectroscopyWe present the line observations in our Atacama Millimeter-Submillimeter Array imaging spectral scan toward three deeply buried nuclei in NGC 4418 and Arp 220. We cover 67GHz in f_rest_=215-697GHz at about 0.2 (30, 80pc) resolution. All the nuclei show dense line forests; we report our initial line identification using 55 species. The line velocities generally indicate gas rotation around each nucleus, tracing nuclear disks of ~100pc in size. We confirmed the counter-rotation of the nuclear disks in Arp 220 and that of the nuclear disk and the galactic disk in NGC 4418. While the brightest lines exceed 100K, most of the major lines and many ^13^C isotopologues show absorption against even brighter continuum cores of the nuclei. The lines with higher upper-level energies, including those from vibrationally excited molecules, tend to arise from smaller areas, indicating radially varying conditions in these nuclei. The outflows from the two Arp 220 nuclei cause blueshifted line absorption below the continuum level. The absorption mostly has small spatial offsets from the continuum peaks to indicate the outflow orientations. The bipolar outflow from the western nucleus is also imaged in multiple emission lines, showing the extent of ~1" (400pc). Redshifted line absorption against the nucleus of NGC 4418 indicates either an inward gas motion or a small collimated outflow slanted to the nuclear disk. We also resolved some previous confusions due to line blending and misidentification.2021ApJ...923..240Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/923/240CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/73/359 : 1.49 GHz atlas of the IRAS bright galaxies (Condon+, 1990)J/ApJ/378/65 : 8.4GHz observations of compact starbursts (Condon+ 1991)J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)J/ApJ/799/10 : Arp 220 6 and 33GHz images (Barcos-Munoz+, 2015)J/A+A/582/A91 : NGC 4418 ALMA mm-wave spectral scan (Costagliola+, 2015)J/A+A/590/A25 : Arp 220 HCN and HCO^+^ data cubes (Martin+, 2016)J/A+A/593/A86 : Arp 220 LOFAR radio images at 150MHz (Varenius+, 2016)J/ApJS/233/11 : Cyanoacetylene (HC_3_N) infrared spectrum (Bizzocchi+, 2017)J/A+A/607/A43 : NGC 4418/VV 655 HI images (Varenius+, 2017)J/A+A/623/A173 : SNe/SNRs in starburst galaxy Arp 220 (Varenius+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/923/240https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/923/240http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/923/240https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/923/240https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/923/240http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/923/240GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredMillimeterdefaultJ/ApJ/923/240/table5Initial spectral model of the nucleus of NGC 4418recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFrest[216.27/366.24] Rest frequencyGHzem.freqdoubleInu[3/832] Peak line intensitymJy/beamspect.line.intensity;stat.maxfloatS[0.4/192] Velocity integrated line intensityJy.km.s**-1.beam**-1spect.line.intensityfloatSpeciesSpecies with vibrational states when necessarymeta.id;phys.molchar