J/ApJ/678/96ivo://CDS.VizieR/J/ApJ/678/96doi:10.26093/cds/vizier.16780096CDSBraatz J.A.Gugliucci N.E.2017-12-22T05:33:22Z2010-09-29T11:10:41ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiastrophysical-masersradio-astronomyradio-sourcesradial-velocityUsing the Green Bank Telescope, we conducted a "snapshot" survey for water maser emission toward the nuclei of 611 galaxies and detected eight new sources. The sample consisted of nearby (v<5000km/s) and luminous (M_B_<-19.5) galaxies, some with known nuclear activity but most not previously known to host AGNs. Our detections include both megamasers associated with AGNs and relatively low luminosity masers probably associated with star formation. The detection in UGC 3789 is particularly intriguing because the spectrum shows both systemic and high-velocity lines indicative of emission from an AGN accretion disk seen edge-on. Based on 6 months of monitoring, we detected accelerations among the systemic features ranging from 2 to 8km/s/yr, the larger values belonging to the most redshifted systemic components. High-velocity maser lines in UGC 3789 show no detectable drift over the same period. Although UGC 3789 was not known to be an AGN prior to this survey, the presence of a disk maser is strong evidence for nuclear activity, and an optical spectrum obtained later has confirmed it. With follow-up observations, it may be possible to measure a geometric distance to UGC 3789.2008ApJ...678...96Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/678/96CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/132/1322 : Water maser survey (Gomez+, 2006)J/ApJ/658/1096 : H2O maser classification (Deacon+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/678/96https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/678/96http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/678/96https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/678/96https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/678/96http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/678/96GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/678/96/table1 (H2O masers detected during the Green Bank Telescope (GBT) survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/678/96/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/678/96/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/678/96/table1?GETtext/xml+votable180.050000true2.472525.9238890.005555555555555556Cone search capability for table J/ApJ/678/96/table2 (Galaxies surveyed for water maser emission but not detected)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/678/96/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/678/96/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/678/96/table2?GETtext/xml+votable180.050000true0.361531.43372220.0055555555555555566/11 14 32 43 131 144 177 203 538 550 552 556 558 564 620 626 638 649 652 664 697 700 738 745 908 932 936 941 948 950 953 956 959 975 986 987 1000 1013 1067 1596 1598 1672 1675 1684 1696 1700 1701 1702 1707 2051 2077 2121 2123 2173 2201 2206 2215 2218 2227 2228 2236 2248 2251 2254 2260 2261 2263 2265 2266 2276 2282 2290 2310 2311 2347 2354 2355 2362 2390 2400 2412 2432 2437 2564 2566 2569 2654 2708 2856 3072 3078 3085 3119 3397 3421 3446 3519 3538 3559 3910 3968 4053 4088 4105 4110 4182 4188 4654 4716 4718 4719 4740 4801 4803 4804 4806 5739 5818 5820 5827 6103 6129 6138 6637 6936 7030 7036 7037 7098 7137 7157 7177 7198 7199 7231 7234 7241 7272 7303 7457 7488 7498 7523 7602 7606 7659 7738 7783 7792 7796 7815 7824 7869 7888 7947 7957 7975 7980 7982 7986 8004 8010 8064 8067 8085 8111 8113 8114 8122 8167 8169 8173 8196 8256 8320 8458 8479 8482 8506 8512 8523 8548 8552 8557 8558 8562 8563 8589 8617 8642 10151 10202 10213 10475 10627 10628 10637 10723 10727 11246 11379 11383 11389 11443 11446 11726 11738 11750 11975 12005 12140 12422 12444 12455 12467 12471 12484 12497 12532 12723 13124 13558 13566 13581 13862 13900 13902 13903 13906 13913 13925 14526 14935 14961 15056 15061 15161 15197 15323 15881 15974 16108 16120 16322 16470 16479 16679 16696 16791 16807 16871 16886 16986 17032 17038 17235 17245 17281 17286 17340 17525 17595 17604 17661 17662 17698 17747 17753 17761 17777 17780 17795 17838 17855 17905 17973 17975 17980 17991 17995 18013 18016 18055 18071 18103 18115 18122 18123 18204 18209 18214 18243 18245 18271 18300 18325 18379 18383 18384 18398 18458 18507 18536 18591 18689 18692 18714 18745 18800 18809 18829 18854 18864 18868 18877 18895 18913 18931 18932 18941 19051 19125 19139 19227 19268 19283 19481 19491 19611 19618 19624 19625 19749 19818 19943 19954 20000 20014 20060 20090 20177 20188 20225 20242 20254 20277 20279 20309 20312 20332 20342 20390 20403 20405 20417 20418 20432 21859 21875 21953 21966 21970 21994 22343 22361 22488 22654 22742 22750 22772 22923 22943 22944 22953 22956 22966 22972 22973 23000 23001 23013 23017 23019 23075 23077 23123 23124 23177 23208 23296 23301 23313 23349 23362 23887 25946 25972 26175 26261 26271 26307 26336 26803 27028 27030 27098 27227 27347 27348 27367 27376 27377 27384 27426 27512 27514 27519 27603 27604 27720 27721 27723 27741 27743 27764 27766 27767 27773 27857 27860 27861 27862 27914 27936 27937 27938 27944 27945 27947 28015 28032 28035 28039 28123 28141 28167 28173 28184 28208 28381 28453 28458 28461 28463 28464 28513 28515 28593 29795 30044 30058 30071 30172 30174 30529 31430 31665 31880 31919 31964 31991 31998 32168 32207 32224 32231 32240 32244 32328 32335 32478 32479 32482 32550 32582 32584 32669 32713 32740 34531 35674 35799 35827 36020 36081 36249 36255 36258 36261 36272 36276 36338 36716 36789 36796 40151 40221 40250 40254 40294 40300 40304 40337 40384 40410 40939 40943 45054 47003 47005 47046 47047 47058 47069 47071 47076 47077 47078 48283 48406 48462 48464 48487 48605 48665https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/678/96?format=asciiOpticalRadiodefaultJ/ApJ/678/96/table1H2O masers detected during the Green Bank Telescope (GBT) surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNGC or UGC Sourcemeta.idcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of right ascension (J2000)pos.eq.dec;meta.mainHVelHeliocentric recession velocity from NEDkm/sspect.dopplerVeloc;pos.heliocentricinte_HVelHVel uncertaintykm/sstat.errorintSpeakPeak flux densitymJyphot.flux.density;em.radio.12-30GHzintLisoInferred isotropic luminosity of the maser emissionsolLumphys.luminosityfloatObsDateDate of observationtime.epochnullableSimbadSimbad column added by the CDScharNEDSimbad column added by the CDScharJ/ApJ/678/96/table2Galaxies surveyed for water maser emission but not detectedNameSource namemeta.id;meta.maincharTimeIntegration timemintime.duration;obs.exposureintrms1RMS noise from first spectral window (1)mJyinstr.det.noisefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVelRecession velocitykm/sinstr.bandwidthintObsDateDate of the observationtime.epochnullableTempSystem temperature from first spectral windowKphys.temperaturefloatV1lowLower velocity range covered by first windowkm/sinstr.bandwidthintV1hiUpper velocity range covered by first windowkm/sinstr.bandwidthintrms2RMS noise from second spectral windown (1)mJyinstr.det.noisefloatV2lowLower velocity range covered by second windowkm/sinstr.bandwidthintV2hiUpper velocity range covered by second windowkm/sinstr.bandwidthintSimbadSimbad column added by the CDScharNEDSimbad column added by the CDSchar