J/ApJ/769/79ivo://CDS.VizieR/J/ApJ/769/79doi:10.26093/cds/vizier.17690079CDSWylezalek D.Galametz A.Stern D.Vernet J.De Breuck C.Seymour N.,Brodwin M.Eisenhardt P.R.M.Gonzalez A.H.Hatch N.Jarvis M.,Rettura A.Stanford S.A.Stevens J.A.2017-10-18T08:25:04Z2015-01-13T08:29:28ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-sourcesradio-galaxiesredshiftedquasarsWe report the first results from the Clusters Around Radio-Loud AGN program, a Cycle 7 and 8 Spitzer Space Telescope snapshot program to investigate the environments of a large sample of obscured and unobscured luminous radio-loud active galactic nuclei (AGNs) at 1.2<z<3.2. These data, obtained for 387 fields, reach 3.6 and 4.5{mu}m depths of [3.6]_AB_=22.6 and [4.5]_AB_=22.9 at the 95% completeness level, which is two to three times fainter than L* in this redshift range. By using the color cut [3.6]-[4.5]>-0.1 (AB), which efficiently selects high-redshift (z>1.3) galaxies of all types, we identify galaxy cluster member candidates in the fields of the radio-loud AGN. The local density of these Infrared Array Camera (IRAC)-selected sources is compared to the density of similarly selected sources in blank fields. We find that 92% of the radio-loud AGN reside in environments richer than average. The majority (55%) of the radio-loud AGN fields are found to be overdense at a>=2{sigma} level; 10% are overdense at a>=5{sigma} level. A clear rise in surface density of IRAC-selected sources toward the position of the radio-loud AGN strongly supports an association of the majority of the IRAC-selected sources with the radio-loud AGN. Our results provide solid statistical evidence that radio-loud AGN are likely beacons for finding high-redshift galaxy (proto-)clusters. We investigate how environment depends on AGN type (unobscured radio-loud quasars versus obscured radio galaxies), radio luminosity and redshift, finding no correlation with either AGN type or radio luminosity. We find a decrease in density with redshift, consistent with galaxy evolution for this uniform, flux-limited survey. These results are consistent with expectations from the orientation-driven AGN unification model, at least for the high radio luminosity regimes considered in this sample.2013ApJ...769...79Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/769/79CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)VIII/79 : The VLA Low-frequency Sky Survey at 74MHz (Cohen+ 2007)VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/MNRAS/438/1149 : WISE data for radio-loud AGN samples (Gurkan+, 2014)J/A+A/567/A76 : COSMOS field radio-loud AGN population at z>1 (Baldi+, 2014)J/ApJ/763/127 : Galaxy clusters discovered in the SPT survey (Reichardt+, 2013)J/ApJ/746/85 : THe HST Cluster Supernova Survey. V. (Suzuki+, 2012)J/MNRAS/416/2041 : H{alpha} emitters at z=2.23 (Matsuda+, 2011)J/AJ/140/533 : Morphologies of selected AGN (Griffith+, 2010)J/ApJ/716/530 : Mid-IR variability from the SDWFS (Kozlowski+, 2010)J/ApJ/684/905 : Galaxy clusters from IRAC Shallow Survey (Eisenhardt+, 2008)J/ApJ/658/815 : Radio loudness of active galactic nuclei (Sikora+, 2007)J/A+A/461/823 : Candidate Ly{alpha} emitting galaxies (Venemans+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/769/79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/769/79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/769/79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/769/79https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/769/79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/769/79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/769/79/table1 (The CARLA sample of radio-loud AGNs (Clusters Around Radio-Loud AGNs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/769/79/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/769/79/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/769/79/table1?GETtext/xml+votable180.050000true1.5466667-1.69727780.0055555555555555566/28 220 546 573 1009 2075 2142 2158 2247 2286 2311 2327 2471 2530 2547 2602 2617 2637 2640 2713 2741 2755 2843 4108 4120 4242 4245 4269 4280 4299 4333 4361 4446 4594 4599 4651 4674 4708 4720 4798 4809 4818 4822 4829 4831 4850 4888 4892 5035 5070 5072 5082 5087 5119 5147 5193 5243 5271 5286 5303 5319 5345 5352 5356 5391 5411 5432 5440 5442 5448 5511 5514 5534 5562 5574 5676 5758 5765 5794 5814 5817 5846 5847 5848 5864 5873 5955 6033 6037 6079 6117 6167 6198 6230 6234 6356 6359 6412 6417 6430 6460 6469 6479 6494 6528 6535 6546 6560 6566 6574 6589 6601 6633 6648 6899 6998 7055 7195 7274 7311 7346 7351 7371 7393 7426 7472 7617 8229 8274 8349 8365 8368 8468 8504 8525 8548 8588 8632 8640 8660 8673 8709 8740 8769 8805 8868 8925 9021 9170 9232 9244 9270 9334 9369 9398 9412 9442 9452 9460 9467 9512 9819 9906 9961 9976 9978 10103 10219 10229 10237 10260 10457 10463 10529 10545 10596 10634 10673 10694 10695 10787 10798 10812 10832 10849 10925 10964 10971 11006 11078 11191 11197 11226 11260 11273 11284 11353 11413 11438 11480 11514 11601 11606 11607 11615 11640 11650 11782 11805 11822 11833 11845 11924 12306 12338 12687 13074 13643 13716 15011 15126 15335 15354 15358 15359 16043 16454 16463 16522 16638 16668 16722 16776 16784 17026 17095 17224 17399 17816 17823 17999 18004 18019 18058 18290 18514 18544 18624 18773 18881 19101 19390 19426 19500 19557 19613 19685 19698 19713 19798 20034 20122 20167 20369 20726 21038 21171 21975 22375 22398 23069 23375 24691 24698 24761 24762 25479 25822 25919 26000 26011 26035 26036 26097 26100 26254 26448 26457 26511 26525 26614 26673 26966 27102 27220 27253 27290 27301 27436 27448 27468 27481 27518 27559 27583 27761 27794 27814 27908 28004 28376 28383 28538 28540 28632 28648 28666 28994 30031 30076 31332 31439 31478 31535 31575 31589 31645 31663 32338 32391 33202 33871 35587 35792 35795 35895 36042 36100 36151 36189 36228 36493 36601 36627 36863 38360 38518 38777 38829 38895 40240 40288 40395 40742 40825 41285 41300 42730 43359 43491 44057 44201 44337 46545 46564 46829 46831 47049 47576 48174 48183 48319 48330 48356 48420 48463 48714 48803https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/769/79?format=asciiOpticalInfraredRadiodefaultJ/ApJ/769/79/table1The CARLA sample of radio-loud AGNs (Clusters Around Radio-Loud AGNs)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (sorted by increasing RA)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainz[1.3/4.2] Redshiftsrc.redshiftfloatlogL[0/29.5] log of rest-frame 500MHz luminositylog(W.Hz**-1)phys.luminosity;em.radiofloatSigma[4.5/22.6]? Surface density {Sigma} of IRAC-selected sources in the CARLA fieldarcmin**-2src.densityfloatnullableTypeAGN type (HzRGs=high-redshift radio galaxies; RLQ=radio-loud quasars)meta.code.classcharDR7QCross-match with the SDSS-DR7 quasar catalog (VII/260) within 10"meta.ref.urlintnullable