J/ApJ/854/124ivo://CDS.VizieR/J/ApJ/854/124doi:10.26093/cds/vizier.18540124CDSZhao W.Braatz J.A.Condon J.J.Lo K.Y.Reid M.J.Henkel C.,Pesce D.W.Greene J.E.Gao F.Kuo C.Y.Impellizzeri C.M.V.2019-01-22T13:34:22Z2019-01-02T11:06:42ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiastrophysical-masersradio-astronomyradio-sourcesblack-holesinterferometryWe present high-resolution (submas) Very Long Baseline Interferometry maps of nuclear H_2_O megamasers for seven galaxies. In UGC 6093, the well-aligned systemic masers and high-velocity masers originate in an edge-on, flat disk and we determine the mass of the central supermassive black holes (SMBH) to be M_SMBH_=2.58x10^7^M_{sun}_ (+/-7%). For J1346+5228, the distribution of masers is consistent with a disk, but the faint high-velocity masers are only marginally detected, and we constrain the mass of the SMBH to be in the range (1.5-2.0)x10^7^M_{sun}_. The origin of the masers in Mrk 1210 is less clear, as the systemic and high-velocity masers are misaligned and show a disorganized velocity structure. We present one possible model in which the masers originate in a tilted, warped disk, but we do not rule out the possibility of other explanations including outflow masers. In NGC 6926, we detect a set of redshifted masers, clustered within a parsec of each other, and a single blueshifted maser about 4.4pc away, an offset that would be unusually large for a maser disk system. Nevertheless, if it is a disk system, we estimate the enclosed mass to be M_SMBH_<4.8x10^7^M_{sun}_. For NGC 5793, we detect redshifted masers spaced about 1.4pc from a clustered set of blueshifted features. The orientation of the structure supports a disk scenario as suggested by Hagiwara+ (2001ApJ...560..119H). We estimate the enclosed mass to be M_SMBH_<1.3x10^7^M_{sun}_. For NGC 2824 and J0350-0127, the masers may be associated with parsec- or subparsec-scale jets or outflows.2018ApJ...854..124Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/854/124CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/695/276 : Search for megamasers in type-2 AGNs (Bennert+, 2009)J/A+A/530/A147 : Megamaser detection in Seyfert galaxies (Ramolla+, 2011)J/ApJ/727/20 : The Megamaser Cosmology Project (MCP). III. (Kuo+, 2011)J/ApJ/817/128 : Megamaser Cosmology Project. VIII. NGC5765B (Gao+, 2016)J/ApJ/826/L32 : Black hole masses in megamaser disk galaxies (Greene+, 2016)J/ApJ/834/52 : The Megamaser Cosmology Project (MCP). IX. (Gao+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/854/124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/854/124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/854/124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/854/124https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/854/124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/854/124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/854/124/table1 (The megamaser sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/854/124/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/854/124/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/854/124/table1?GETtext/xml+votable180.050000true165.199821110.72816080.0055555555555555566/4930 11090 21996 23095 27486 30027 44812https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/854/124?format=asciiRadiodefaultJ/ApJ/854/124/table4Re-averaged dataGalGalaxy identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCodeExperiment code identifiermeta.idcharVel[7971/11602] Center of velocity rangekm/sphys.veloc;instr.bandwidthdoubleb_Vel[7967/11588] Lower boundary of velocity range (1)km/sphys.veloc;instr.bandwidth;stat.mindoubleB_Vel[7976/11616] Upper boundary of velocity range (1)km/sphys.veloc;instr.bandwidth;stat.maxdoublethetaX[-0.3/0.3] East-west position offset (2)maspos;arith.difffloate_thetaX[0.001/0.05] Uncertainty in thetaX (3)masstat.errorfloatthetaY[-0.4/0.5] North-south position offset (2)maspos;arith.difffloate_thetaY[0.003/0.08] Uncertainty in thetaY (3)masstat.errorfloatSNR[4/124] Signal-to-Noise ratio (4)stat.snrfloatJ/ApJ/854/124/table1The megamaser sampleSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy namemeta.id;meta.maincharf_GalFlag on Gal (1)meta.codecharVLSR[2752/12307] LSR "optical" velocity from NEDkm/sspect.dopplerVeloc.opt;em.opt;pos.lsrintDist[38.9/167.4] Distance D_A_ (2)Mpcpos.distance;pos.heliocentricfloatMorphHost galaxy morphological type from NEDsrc.morph.typecharTypeAGN type from NEDsrc.classcharDiscDiscovery referencemeta.bibcharf_Disc[e] e: Megamaser discovery from previous Megamaser Cosmology Project (MCP) work and datemeta.codecharNmNumber of maser fits for this galaxy (link to Table 3,and Table 4)meta.numberintnullableNEDNED column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/854/124/table3Maser fitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy identifiermeta.id;meta.maincharCodeExperiment code identifiermeta.idcharVLSR[2527/12414] Local Standard of Rest velocity (1)km/sphys.veloc;pos.lsrdoubleWidth[1.7/9] Channel widthkm/sspect.resolutionfloatthetaX[-5.4/4.9] East-west position offset (2)maspos;arith.difffloate_thetaX[0.0009/0.2] Uncertainty in thetaX (3)masstat.errordoublethetaY[-13/10.8] North-south position offset (2)maspos;arith.diffdoublee_thetaY[0.003/0.5] Uncertainty in thetaY (3)masstat.errorfloatFnu[1/402] Fitted peak intensity; mJy/beamphot.flux.density;em.radio.12-30GHzfloate_Fnu[0.5/4.3] RMS uncertainty in Fnustat.errorfloat