J/A+A/641/A162ivo://CDS.VizieR/J/A+A/641/A162doi:10.26093/cds/vizier.36410162CDSPanessa F.Castangia P.Malizia A.Bassani L.Tarchi A.Bazzano A.,Ubertini P.2020-12-07T11:26:25Z2020-09-24T08:23:35ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiastrophysical-masersradio-astronomyx-ray-sourcesWater megamaser emission at 22GHz has proven to be a powerful tool for astrophysical studies of active galactic nuclei (AGN) because it allows an accurate determination of the mass of the central black hole and of the accretion disc geometry and dynamics. However, after searches among thousands of galaxies, only ~200 of them have shown such spectroscopic features, most of them of uncertain classification. In addition, the physical and geometrical conditions under which a maser activates are still unknown. We characterize the occurrence of water maser emission in an unbiased sample of AGN by investigating the relation with the X-ray properties and the possible favourable geometry that is required to detect water maser. We searched for 22GHz maser emission in a hard X-ray selected sample of AGN, taken from the INTEGRAL/IBIS survey above 20keV. Only half of the 380 sources in the sample have water maser data. We also considered a volume-limited sub-sample of 87 sources, for which we obtained new observations with the Green Bank and Effelsberg telescopes (for 35 sources). We detected one new maser and increased its radio coverage to 75%. The detection rate of water maser emission in the total sample is 15+/-3%. This fraction increases to 19+/-5% for the complete sub-sample, especially when we consider type 2 (22+/-5% and 31+/-10% for the total and complete samples, respectively) and Compton-thick AGN (56+/-18% and 50+/-35% for the total and complete samples, respectively). No correlation is found between water maser and X-ray luminosity. We note that all types of masers (disc and jet) are associated with hard X-ray selected AGN. These results demonstrate that the hard X--ray selection may significantly enhance the maser detection efficiency over comparably large optical or infrared surveys. A possible decline in detection fraction with increasing luminosity might suggest that an extremely luminous nuclear environment does not favour maser emission. The large fraction of CT AGN with water maser emission could be explained in terms of geometrical effects. The maser medium would then be the very edge-on portion of the obscuring medium.2020A&A...641A.162Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/641/A162CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/695/276 : Search for megamasers in type-2 AGNs (Bennert+, 2009)J/MNRAS/426/1750 : INTEGRAL/IBIS AGN catalogue (Malizia+, 2012)J/MNRAS/460/19 : Update of INTEGRAL/IBIS AGN catalogue (Malizia+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/641/A162https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/641/A162http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/641/A162https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/641/A162https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/641/A162http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/641/A162GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/641/A162/tablea1 (Water maser data of 380 galaxies detected by INTEGRAL/IBIS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/641/A162/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/641/A162/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/641/A162/tablea1?GETtext/xml+votable180.050000true1.00870.32180560.0055555555555555566/43 815 893 941 953 1121 1263 1405 1526 1546 1566 1583 1638 1677 1701-1702 1835 1841 2004 2221 2549 2551 2564 2994 3023 3056 3223 3309 3375 3502 3616 3682 3762 3771 3886 4158 4439 5149 5423 6665 6977 7060 7246 7386 7422 7424 7560 7606 7642 7869 7921 7952 7959 7969 8029 8071 8299 8868 8870 8922 8945 8972 9468 9502 9513 9519 9529 9612 9707 10118 10348 10605 10707 10847 10912 10925 10927 10977 10984 11071 11618 12640 12921 12973 13021 13179 13202 13541 13707 13927 14051 14205 14534 14541 14641 14653 14702 14744 14777 14858 15331 15351 15433-15434 15481 15654 15658 15698 15808 15825 15969 16042 16100 16184-16185 16301 16333 17075 17214 17448 17520 17525 17727 17748 17754 17785 17795 17814 17845 18484 18524 19283 19373 19622 20000 20014 20079 20099 20156 20201 20489 20556 20657 20676 20750 20861 21036 21450 21758 21996 22890 22912 22975 23010 23167 23323 23332 23469 24084 24120 24123 24127 24170 24381 24842 25035 25054 25182 25439 25610 25735 25742 25790 25907 26071 26131 26148 26267 26292 26297 26300 26303 26374 26393 26400 26515 26547 27699 27721-27722 27734 27767 27976 28060 28075 28083 28517 28535 28639 28643 28719 28742 28805 28848 28908 28911 29046 29072 29125 29262 29265 29346 29466 29558 29570 29574 29648 29668 29675 29774 29795 29906 30027 30140 30306 31158 31509 31833 31940 32028 32683 32931 32961 33034 33164 33924 34104 34264 34294 34531 34881 35161 35246 35521 35623 36158 36552 36668 36765 36785-36786 36861 36896 37117 37190 37321 37346 37385 37650 37850 37913 38113 38129 38268 38479 38539 38653 38704 38817 38916 38948 39182 39295 39322 39349 39366 39690 39717 39942 39977 40204 40221 40410 40818 41014 41087 41423 41435 41442 41444 41493 41499 41586 41679 41701 41736 41738 41798 41873 41876 41929 41938 41982 42005 42012 42016 42027 42120 42179 42456 42528 42669 42677 42683 42704 42722 42822 42852 43057 43064 43104-43105 43233 43262 43294 43339 43359 43366 43412 43417 43429 43452 43520 43625 43634 43667 43677 43806 43825 43860 43877 44043 44448 44507 44551 44660 44668 44892 44908 45220 45222 45735 45779 45985 46399 46831 46987 47016 47047 47120 47154 47169 47245 47534 47597 47731 47854 47971 48022-48023 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/641/A162?format=asciiX-rayRadiodefaultJ/A+A/641/A162/tablea1Water maser data of 380 galaxies detected by INTEGRAL/IBISSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the sourcemeta.id;meta.maincharn_Name[*12] Note on Name (1)meta.notecharRAJ2000Right Ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainz? Redshiftsrc.redshiftdoublenullableClassOptical classificationmeta.code.classcharl_F20-100Limit flag on F20-100meta.code.errorcharF20-10020-100keV flux (3)1e-14W.m**-2phot.flux;em.X-ray.hardfloatl_F2-10Limit flag on F2-10meta.code.errorcharF2-10? 2-10keV flux (3)1e-14W.m**-2phot.flux;em.X-ray.mediumfloatnullablen_F2-10Interval of 2-10keV flux when variablemeta.notecharl_logNHLimit flag on NHmeta.code.errorcharlogNH? X-ray column densitylog(cm**-2)phys.columnDensityfloatnullableNotesNotes on the water maser (4)meta.notecharrms? 1 sigma rms in mJy (5)mJyinstr.det.noiseintnullableChannel? Wide channel if not 0.3km/s for rmskm/sstat.error;instrfloatnullablel_L(H2O)Limit flag on L(H2O)meta.code.errorcharL(H2O)? Water maser isotropic luminosities (6)solLumphys.luminositydoublenullablee_L(H2O)? rms uncertainty on L(H20)solLumstat.errorfloatnullableRefReferences for the rms (7)meta.refcharn_Ref[*] Note on Ref (8)meta.notechar