J/A+A/603/A68ivo://CDS.VizieR/J/A+A/603/A68doi:10.26093/cds/vizier.36030068CDSMoser L.Sanchez-Monge A.Eckart A.Requena-Torres M.A.,Garcia-Marin M.Kunneriath D.Zensus A.Britzen S.Sabha N.,Shahzamanian B.Borkar A.Fischer S.2017-07-17T11:44:54Z2017-07-10T06:36:39ZCDS support team

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

cds-question@unistra.frmilky-way-galaxymolecular-cloudsmillimeter-astronomysubmillimeter-astronomyWe report serendipitous detections of line emission with the Atacama Large Millimeter/submillimeter Array (ALMA) in bands 3, 6, and 7 in the central parsec down to within 1" around Sgr A* at an up to now highest resolution (<0.5") view of the Galactic center (GC) in the submillimeter (sub-mm) domain. From the 100GHz continuum and the H39{alpha} emission we obtain a uniform electron temperature around Te~6000K for the minispiral. The spectral index (S{prop.to}{nu}^{alpha}^) of Sagittarius A* (Sgr A*) is ~0.5 at 100-250GHz and ~0.0 at 230-340GHz. The bright sources in the center show spectral indices around -0.1 implying Bremsstrahlung emission, while dust emission is emerging in the minispiral exterior. Apart from CS, which is most widespread in the center, H^13^CO^+^, HC_3_N, SiO, SO, C_2_H, CH_3_OH, ^13^CS and N_2_H+ are also detected. The bulk of the clumpy emission regions is at positive velocities and in a region confined by the minispiral northern arm (NA), bar, and the sources IRS 3 and 7. Although partly spatially overlapping with the radio recombination line (RRL) emission at same negative velocities, the relation to the minispiral remains unclear. A likely explanation is an infalling clump consisting of denser cloud cores embedded in diffuse gas. This central association (CA) of clouds shows three times higher CS/X (X: any other observed molecule) ratios than the circumnuclear disk (CND) suggesting a combination of higher excitation, by a temperature gradient and/or infrared (IR) pumping, and abundance enhancement due to UV and/or X-ray emission. Hence, we conclude that this CA is closer to the center than the CND. Moreover, we find molecular line emission at velocities up to 200km/s. Apart from the CA, we identified two intriguing regions in the CND. One region shows emission in all molecular species and higher energy levels tested in this and previous observations and contains a methanol class I maser. The other region shows similar behavior of the line ratios such as the CA. Outside the CND, we find the traditionally quiescent gas tracer N_2_H^+^ coinciding with the largest IR dark clouds (IRDC) in the field. Methanol emission is found at and around previously detected methanol class I masers in the same region. We propose to make these particular regions subject to further studies in the scope of hot core, cold core, and extreme photon and/or X-ray dominated region (PDR/XDR) chemistry and consequent star formation in the central few parsecs.2017A&A...603A..68Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/603/A68CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/502/91 : Proper motions of stars near SgrA* (Schoedel+, 2009)J/A+A/511/A18 : NIR observations of stars near SgrA* (Schoedel+, 2010)J/A+A/534/A117 : NIR polarimetry of sources near SgrA* (Buchholz+, 2011)J/ApJ/755/90 : [NeII] emission line obs. from SgrA West (Irons+, 2012)J/MNRAS/428/2731 : SgrA* emission at 7mm (Beaklini+, 2013)J/A+A/582/A118 : OH-streamer in SgrA at 1665 and 1667MHz (Karlsson+, 2015)J/ApJ/820/90 : 4yr 1.3mm VLBI observations of SgrA* with EHT (Fish+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/603/A68https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/603/A68http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/603/A68https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/603/A68https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/603/A68http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/603/A68GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/603/A68/list (List of fits datacubes and images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/603/A68/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/603/A68/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/603/A68/list?GETtext/xml+votable180.050000true266.41681-29.007830.0055555555555555566/28830https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/603/A68?format=asciiRadiodefaultJ/A+A/603/A68/listList of fits datacubes and imagessizeSize of FITS fileKibytephys.size;meta.fitsintrecnoRecord 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 slicesmeta.numberintnullableObs.DateObservation date (YYYY-MM-DDThh:mm:ss.ssssss)time.epoch;obscharFreqObserved frequency, or lower value of frequency interval for datacubesHzem.freqdoubleBFreq? Upper value of observed frequency for datacubesHzem.freq;stat.maxdoublenullabledFreq? Frequency resolution for datacubesHzspect.resolutiondoublenullableFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar