Angular sizes of AGN cores at 2-43GHz J/MNRAS/452/4274 ivo://CDS.VizieR/J/MNRAS/452/4274 doi:10.26093/cds/vizier.74524274 CDS Pushkarev A.B. Kovalev Y.Y. 2024-08-15T20:14:39Z 2015-08-21T10:21:24Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr radio-galaxies interferometry very-long-baseline-interferometry interstellar-medium We have measured the angular sizes of radio cores of active galactic nuclei (AGN) and analyzed their sky distributions and frequency dependencies to study synchrotron opacity in AGN jets and the strength of angular broadening in the interstellar medium. We have used archival very long baseline interferometry (VLBI) data of more than 3000 compact extragalactic radio sources observed at frequencies, {nu}, from 2 to 43GHz to measure the observed angular size of VLBI cores. We have found a significant increase in the angular sizes of the extragalactic sources seen through the Galactic plane (|b|<10{deg}) at 2, 5 and 8GHz, about 1/3 of which show significant scattering. These sources are mainly detected in directions to the Galactic bar, the Cygnus region, and a region with galactic longitudes 220{deg}<l<260{deg} (the Fitzgerald window). The strength of interstellar scattering of the AGNs is found to correlate with the Galactic H{alpha} intensity, free-electron density, and Galactic rotation measure. The dependence of scattering strengths on source redshift is insignificant, suggesting that the dominant scattering screens are located in our Galaxy. The observed angular size of Sgr-A* is found to be the largest among thousands of AGN observed over the sky; we discuss possible reasons of this strange result. Excluding extragalactic radio sources with significant scattering, we find that angular size of opaque cores in AGN scales typically as {nu}^-1^ confirming predictions of a conical synchrotron jet model with equipartition. 2015MNRAS.452.4274P https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/452/4274 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/452/4274 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/452/4274 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/452/4274 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/452/4274 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/452/4274 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/452/4274 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/452/4274/table2 (Apparent angular sizes of the VLBI cores of AGN) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/452/4274/table2? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/452/4274/table2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/452/4274/table2? 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28251 28258 28265-28266 28268 28271 28282 28293 28303 28305 28311 28315 28318 28321 28335 28338-28340 28344 28365 28368 28370 28377 28384 28386 28405 28408 28416 28442 28447 28449 28456 28460 28466 28495 28501 28511 28514 28516 28522-28523 28528-28530 28541-28542 28547 28560 28563 28567 28581 28587 28594 28600-28601 28612 28617 28619 28622 28629 28643 28650-28651 28653 28664 28668 28670 28673 28762 28781 28789 28798 28818 28822 28828 28830 28859 28888 28900 28915 28920 28928 28934 28936 28945 28959 28979 28998-28999 29003 29005 29008 29017-29018 29039 29063 29072 29074 29079 29110 29138 29151 29185 29196 29202 29215 29218 29221 29247 29251 29270-29271 29275 29303 29311 29320 29337 29340 29350 29352 29368 29378 29385 29401 29403 29415 29417 29423 29437 29467 29477 29480 29518 29522 29546 29558 29571 29588 29598 29614 29617 29620 29630 29653 29658 29678 29703 29715 29730 29736 29772 29795 29823 29828 29833 29844 29876 29895 29907 29909 29946 29963 29974 29978 29993 29996 30012 30017 30036 30050 30075 30091 30094 30131 30160 30171 30200 30203 30220 30229 30251 30255 30323-30324 30345 30366-30367 30382 30385 30388 30395 30397 30416-30417 30431 30436 30443-30444 30446 30456 30461 30507 30512 30527 30533 30542 30556 30558 30565 30587 30609 30629 30667 30672 30683 30701 30705-30706 30726 30748 30750 30763 30768 30781 30786-30787 30837 30842 30860 30864 30885 30891 30907 30923 30929 30941-30942 30975 30991 30996-30997 31001-31002 31005 31026 31029 31055 31076 31101 31111-31112 31124 31135 31140 31145-31146 31155 31157 31176 31190 31196 31199 31202 31211 31222 31224 31229 31234-31235 31252 31256 31275-31276 31288 31294 31297 31311 31330 31333-31334 31338 31346 31353 31382 31391 31397 31418-31419 31421 31423 31429 31439 31441 31444 31451 31460 31463 31470 31472 31474 31486 31496 31509 31513 31520 31523 31527 31529 31535 31542 31547 31555 31559 31562 31566 31574 31599 31608 31656 31663 31665-31666 31689 31696 31718 31733-31734 31745 31754 31770 31773-31774 31781 31783-31784 31789 31794 31809-31810 31824-31825 31830 31846 31850 31857 31859 31868 31875 31886 31891 31895 31903 31905 31909 31930 31945 31986 31991 31995 31997-31998 32019 32028 32031 32035 32066 32068-32069 32073 32112 32124-32125 32130-32131 32136 32152 32160 32181 32211 32230-32231 32266 32292 32300 32317 32327 32338 32347-32348 32362 32375 32387 32395 32404 32408 32420 32424 32427 32444 32454 32460 32472 32478 32514 32517-32518 32527 32546 32559 32581 32595 32601 32610 32615 32623 32641 32658 32661 32663 32675 32701 32727 32741 32746 32754 32765 32915 32945 33440 33756 34002 34021 34033 34078 34088 34149 34213 34235 34245 34254 34272 34279 34297 34416 34425 34450 34471 34506 34526 34558 34562 34582 34584 34588 34601 34629 34658 34662 34668 34672 34681 34688 34696 34705 34715 34724 34731 34746 34800 34810-34811 34925 35074 35159 35180 35183 35237 35246 35269 35288 35299 35305 35312 35322 35432 35442 35471 35476 35481 35506 35526 35551 35577 35581 35604 35615 35628 35650 35663 35693-35694 35719 35739-35740 35743-35744 35757-35758 35762 35768 35775 35787 35794 35806 35817 35826 35834 35879 35891 35913 35919 35928 35943 35972 35982 35986 36000 36005 36042 36044 36058 36075 36088-36089 36106 36108 36114 36119 36130 36132 36137-36138 36151 36153 36173 36176 36185 36210 36214 36219 36225 36228 36241 36251 36275 36280-36281 36295 36304 36308 36325 36333 36346 36360 36367-36368 36380 36404 36408 36420 36459 36475 36499 36506 36520 36531 36546 36549-36552 36554 36574 36578 36580 36585-36586 36602 36605 36609 36614 36620 36655 36665 36690 36735 36738 36754 36785 36815 36834 36840 36863 36935 37035 37817 38128 38141 38263 38279 38299 38317 38341 38355 38375 38380 38393 38399 38418 38486 38496 38508 38572 38579-38580 38583 38617 38623 38636 38643 38652 38669 38675 38687 38693 38699 38710 38719 38731 38740 38746 38756 38763-38764 38793 38800 38808 38819 38822 38834-38835 38839 38847 38854 38859 38861 38875 38903 38905 39101 39142 39286-39287 39314 39326 39342 39345 39354 39377 39391-39392 39398 39406 39477 39480 39483 39540 39547 39556 39577 39609 39617 39619 39642 39655-39656 39659 39665 39677 39682 39693 39716 39719 39728-39729 39734 39747 39752 39773-39775 39780 39783 39795 39847 39853 39864 39881 39888 39891 39894 39920 39923-39924 39946 39956 39959 39970 39978 39980 39982 39985 39993 39999 40002 40004-40005 40014 40026 40029 40031 40038-40039 40056 40062 40077 40083 40089 40093 40096 40106 40119 40131 40133 40141 40162 40164-40166 40178 40195 40199-40200 40223 40238 40255 40259 40261 40267 40270 40274 40281 40299 40307 40321 40332 40335 40345-40346 40349 40353 40355 40360 40370 40372 40380 40382 40394 40414 40440-40441 40458 40463 40473 40479 40494 40496 40499 40505 40521-40522 40527 40532-40533 40535 40539 40543 40558 40569 40598 40607 40619 40635 40637 40642-40643 40650 40659 40673 40676 40692 40698 40710 40715 40733 40737 40752 40755 40762 40766 40784 40793 40799 40825 40831 40867 40873-40874 40908 40915 40919 40921 40928 40931 40934 40949 40955 40959 41088 41300 41306 41982 42058 42363 42432 42471 42482-42484 42492 42571 42592 42612 42638 42727 42750 42802 42805 42825 42834 42861 42864 42866 42878 42886 42928 42939 42944 42958 42968 42980-42982 43007 43254 43263 43365 43386 43399 43452 43465 43480 43486 43488 43490 43502 43506 43595 43607 43628 43633 43663-43664 43694 43717 43722 43739 43765 43785 43807 43821 43826 43829 43833 43837 43841 43861-43862 43869 43877-43878 43885 43889 43894 43912 43915-43916 43918 43924 43937 43954 43957 43975 43979 43985 43992 43995-43996 44010 44022 44029 44035 44037 44042 44046 44056 44058 44063 44078 44083 44088 44107 44110 44123 44129 44134 44145 44151 44159 44165 44167 44169 44199 44210 44218 44261 44272 44276 44280 44283 44294 44298 44304 44311 44316 44321 44342 44346-44347 44351 44359 44364 44380-44381 44401 44416 44430 44444 44478 44483 44485 44501 44503 44516 44526-44527 44535 44542 44546 44548 44550 44555-44556 44566 44575 44595 44599 44615 44618 44649-44650 44659 44671 44678 44688 44701 44705 44712 44716 44718 44725 44728 44732 44743 44754 44764 44771 44778 44812 44816 44819 44825 44833 44835 44840-44841 44856 44901 44903 44909-44910 44921 44940 44945 44958 44970 44974 45006 45008 45011 45044-45045 45047 45355 45387 45674 45739 45949 46020 46030 46070 46281 46322 46351 46375 46387 46413-46414 46440-46441 46451 46458 46463 46505-46506 46517 46521-46522 46533 46547 46554 46579 46587 46684 46708 46712 46747 46754 46771 46786 46790 46815 46821 46832 46835 46839 46847 46884 46914 46923 46928 46936 46942 46960-46961 46964 46994 47007 47009 47014 47019 47031 47056 47058 47067 47093 47095 47098 47102 47366 47410 47447 47519 47530 47537 47567 47582 47598 47699 47796 47805 47815 47846 47911 47937 47946 47959 47968 47971 47978 48015 48021 48028 48047 48090 48099 48120 48123 48126 48130 48133 48137 48176 48184 48191 48203 48215 48281 48289 48297 48314 48317 48319 48330 48332 48338 48375 48381 48398 48407 48420 48432 48434 48437 48457 48473 48483 48492 48496 48527 48529 48532 48535 48539-48540 48580 48589 48595 48604 48610 48618 48629 48643 48649 48653-48654 48684 48705 48708 48713 48721 48732 48757-48758 48761 48767 48782 48796 48799 48803 48814 48816 48821 48838 48841 48846 48867 48878 48883 48885 48890 48893 48900 48918 48952 48965 48974 48985 48995 49019 49049 49069-49071 49075 49083-49084 49127 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/452/4274?format=ascii Radio default J/MNRAS/452/4274/table2 Apparent angular sizes of the VLBI cores of AGN recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Source Source name (J2000) meta.id;meta.main char GLAT Galactic latitude (1) deg pos.galactic.lat GLON Galactic longitude (1) deg pos.galactic.lon z [0.001/5.3]? Redshift (2) src.redshift float nullable theta2 ? FWHM angular size of VLBI core at 2GHz (3) mas phys.angSize;em.radio.1500-3000MHz float nullable theta5 ? FWHM angular size of VLBI core at 5GHz (3) mas phys.angSize;em.radio.3-6GHz float nullable theta8 ? FWHM angular size of VLBI core at 8GHz (3) mas phys.angSize;em.radio.6-12GHz float nullable theta15 ? FWHM angular size of VLBI core at 15GHz (3) mas phys.angSize;em.radio.12-30GHz float nullable theta24 ? FWHM angular size of VLBI core at 24GHz (3) mas phys.angSize;em.radio.12-30GHz float nullable theta43 ? FWHM angular size of VLBI core at 43GHz (3) mas phys.angSize;em.mm.30-50GHz float nullable _RA.icrs Right ascension (ICRS) (computed by VizieR, not part of the original data) deg pos.eq.ra nullable indexed _DE.icrs Declination (ICRS) (computed by VizieR, not part of the original data) deg pos.eq.dec nullable indexed