J/ApJ/890/118ivo://CDS.VizieR/J/ApJ/890/118doi:10.26093/cds/vizier.18900118CDSPesce D.W.Braatz J.A.Reid M.J.Condon J.J.Gao F.Henkel C.,Kuo C.Y.Lo K.Y.Zhao W.2022-07-08T07:31:28Z2021-08-17T12:07:51ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiastrophysical-masersradio-astronomyinterferometryradial-velocityAs part of the survey component of the Megamaser Cosmology Project, we have discovered a disk megamaser system in the galaxy CGCG 074-064. Using the Green Bank Telescope and the Very Large Array, we have obtained spectral monitoring observations of this maser system at a monthly cadence over the course of two years. We find that the systemic maser features display line-of-sight accelerations of ~4.4km/s/yr that are nearly constant with velocity, while the high-velocity maser features show accelerations that are consistent with zero. We have also used the High-Sensitivity Array to make a high-sensitivity very long baseline interferometric map of the maser system in CGCG 074-064, which reveals that the masers reside in a thin, edge-on disk with a diameter of ~1.5mas (0.6pc). Fitting a three-dimensional warped disk model to the data, we measure a black hole mass of 2.42_-0.20_^+0.22^x10^7^M_{sun}_ and a geometric distance to the system of 87.6_-7.2_^+7.9^Mpc. Assuming a cosmic microwave background-frame recession velocity of 7308+/-150km/s, we constrain the Hubble constant to H_0_=81.0_-6.9_^+7.4^(stat.)+/-1.4(sys.)km/s/Mpc.2020ApJ...890..118Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/890/118CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/ApJ/659/1040 : VLBI monitoring of NGC 4258 (Argon+, 2007)J/ApJ/689/108 : MASIV survey. II. First four epochs (Lovell+, 2008)J/ApJ/727/20 : The Megamaser Cosmology Project (MCP). III. (Kuo+, 2011)J/AJ/149/171 : 2MASS galaxy group catalog (Tully, 2015)J/ApJ/817/128 : Megamaser Cosmology Project. VIII. NGC5765B (Gao+, 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/890/118https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/890/118http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/890/118https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/890/118https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/890/118http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/890/118GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/890/118/table4 (Measurements for individual maser spots)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/890/118/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/890/118/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/890/118/table4?GETtext/xml+votable180.050000true210.76857386358.94750967890.0055555555555555566/26451https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/890/118?format=asciiRadiodefaultJ/ApJ/890/118/table4Measurements for individual maser spotsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeSpot type (1)meta.codecharRV[6007/7776] Radial velocity in the optical, barycentric reference frame (2)km/sphys.veloc;pos.barycenterfloatSnu[0.0012/0.142] Maser flux density in VLBI channel mapsJyphot.flux.density;em.radio.12-30GHzdoublee_Snu[0.0001/0.0008] Uncertainty in SnuJystat.errordoubleX[-0.832/1.076] Cartesian x coordinate (3)maspos.cartesian.xdoublee_X[0.001/0.025] Uncertainty in Xmasstat.error;pos.cartesian.xdoubleY[-0.26/0.33] Cartesian y coordinate (3)maspos.cartesian.ydoublee_Y[0.0029/0.07] Uncertainty in Ymasstat.error;pos.cartesian.ydoublea[-1.7/7.5] Measured or modeled accelerationkm.s**-1.yr**-1phys.accelerationfloate_a[0.14/3.4] Associated uncertainty from the disk modelingkm.s**-1.yr**-1stat.errorfloatf_a[0/1] Acceleration type; 1=measured; 0=modeledmeta.codeint_RAPosition, computed from position (14:03:04.457746+08:56:51.03483) with X and Y offsets (right ascension part)degpos.eq.ra;meta.main_DEPosition, computed from position (14:03:04.457746+08:56:51.03483) with X and Y offsets (declination part)degpos.eq.dec;meta.main