J/ApJS/265/8ivo://CDS.VizieR/J/ApJS/265/8doi:10.26093/cds/vizier.22650008CDSReddy K.Georganopoulos M.Meyer E.T.Keenan M.Kollmann K.E.2023-10-03T13:09:14Z2023-06-12T11:44:17ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-sourcesx-ray-sourcesredshiftedgalaxy-classification-systemsThe X-ray emission mechanism of powerful extragalactic jets-which has important implications for their environmental impacts-is poorly understood. The X-ray/radio positional offsets in the individual features of jets provide important clues. Extending previous work in Reddy+ (Paper I; 2021ApJS..253...37R), we present a detailed comparison between X-ray maps, deconvolved using the Low-count Image Reconstruction and Analysis tool, and radio maps of 164 components from 77 Chandra-detected X-ray jets. We detect 94 offsets (57%), with 58 new detections. In FR II-type jet knots, the X-rays peak and decay before the radio in about half the cases, disagreeing with the predictions of one-zone models. While a similar number of knots lack statistically significant offsets, we argue that projection and distance effects result in offsets below the detection level. Similar deprojected offsets imply that X-rays could be more compact than radio for most knots, and we qualitatively reproduce this finding with a "moving-knot" model. The bulk Lorentz factor ({Gamma}) derived for knots under this model is consistent with previous radio-based estimates, suggesting that kiloparsec-scale jets are only mildly relativistic. An analysis of the X-ray/radio flux ratio distributions does not support the commonly invoked mechanism of X-ray production from inverse Compton scattering of the cosmic microwave background, but does show a marginally significant trend of declining flux ratio as a function of the distance from the core. Our results imply the need for multi-zone models to explain the X-ray emission from powerful jets. We provide an interactive list of our X-ray jet sample at http://astro.umbc.edu/Atlas-X2023ApJS..265....8Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/265/8CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)J/MNRAS/392/1509 : Distribution of AGNs in galaxy clusters (Gilmour+, 2009)J/ApJ/704/1586 : BCGs with radio AGN (Sun, 2009)J/ApJS/197/24 : Chandra large-scale extragalactic jets. I. (Massaro+, 2011)J/ApJ/914/130 : Chandra & VLA obs. of 14 high-redshift QSOs (Snios+, 2021)http://hea-www.harvard.edu/XJET/ : XJET database home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/265/8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/265/8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/265/8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/265/8https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/265/8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/265/8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/265/8/table5 (List of all Chandra detected X-ray jets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/265/8/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/265/8/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/265/8/table5?GETtext/xml+votable180.050000true5.10416715.6818610.0055555555555555566/18 821 911 946 1129 1263 1466 1701 2052 2214 2227 2249 2343 2402 2414 2484 2569 2704 2899 4014 4088 4114 4263 4285 4303 4341 4366 4376 4446 4695 4820 4924 4927 5018 5027 5284 5439 5597 5673 5758 5794 5817 6193 6252 6399 6532 7005 7061 7181 7351 7426 7508 7873 7925 8288 8525 8528 8556 8644 8675 8705 8858 9273 9633 10004 10217 10228 10355 10529 10598 10601 10743 10802 10849 10877 11104 11377 11408 11461 11512 11613 11652 11667 11715 11924 12010 12241 12593 12796 13074 13496 13663 13707 14744 15023 15067 15174 15286 15344 15494 16027 16059 16093 16184 16281 16301 17105 17184 17979 18017 18035 18065 18365 18669 18683 18928 19157 19321 19341 19745 19842 20099 20355 21358 21990 22364 22396 22501 22659 23167 23223 23323 23476 23691 24300 24349 24775 25255 25302 25472 25630 25863 25905 26083 26245 26292 26374 26499 26525 27026 27102 27382 27514 27521 27580 27714 27765 27773 27955 28083 28149 28249 28315 28540 28574 28609 30140 31080 31333 31346 31352 31730 31940 32394 34013 34104 34264 34911 35079 36178 36263 37385 37686 38311 38579 38682 41701 43262 43281 43957 44247 44908 45446 46040 46481 46721 46964 48595https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/265/8?format=asciiX-rayOpticalRadiodefaultJ/ApJS/265/8/table5List of all Chandra detected X-ray jetsSimbadNameSimbad column added by the CDSmeta.idcharnullableXJETName in the XJET table if any; column added by CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePrimary identifiermeta.id;meta.maincharprimaryObsDisplay the details of radio and Chandra observations (link to Tables 1 and 2)meta.ref.urlintnullableCodeCode identifier for this work (1)meta.codecharIAUIAU identifier (HHMM+DDd; B1950)meta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainz[0.002/6.1] Spectroscopic redshiftsrc.redshiftfloatBeta[0.13/47]? Maximum apparent superluminal motion (2)phys.velocfloatnullableScale[0.02/8.7]? Angular scalekpc/arcsecinstr.scalefloatnullableClassRadio jet morphology descriptor (3)src.morphcharRefReference's bibcode to the previous X-ray observationmeta.bib.bibcodecharOffDisplay the offset analysis results (link to Table 4)meta.ref.urlintnullableJ/ApJS/265/8/table1Details of radio observationsNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPIDProject codemeta.id;obscharDateObserving date (UT)time.epochnullableFreq[1.43/20.16] Frequency of the observationGHzem.freq;obsfloatamaj[0.1/5] Major axis of the beamarcsecphys.angSize;instr.beamfloatbmin[0.1/4.3] Minor axis of the beamarcsecphys.angSize;instr.beamfloatPA[-87/173.5] Position angle of the beamdegpos.posAng;instr.beamfloatRMS[0.3/214] Image noise in 1e-5mJy/beaminstr.det.noisefloatJ/ApJS/265/8/table2Details of Chandra X-ray observationsNameSource namemeta.id;meta.maincharObsIDChandra Observation IDsmeta.id;obscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintExp[0.2/231] Effective exposure after removing any background flaressinstr.background;obs.exposurefloatModeChandra observation modes for each ObsID (1)instr.setupcharRate[0.001/1.2] Average of the count rate from each epochct/sphot.count;em.X-rayfloatJ/ApJS/265/8/table4Offset analysis results and spectral dataSepk[0/19]? Sky projected offsetkpcpos.distancefloatnullablee_Sepk[0/2.5]? Uncertainty in Sepkkpcstat.errorfloatnullableSpIndR[0.5/1.17]? Radio spectral indexspect.indexfloatnullablee_SpIndR[0.03/0.5]? Uncertainty in SpIndRstat.errorfloatnullableSpIndX[0.1/2.4]? X-ray spectral indexspect.indexfloatnullablee_SpIndX[0.01/0.9]? Uncertainty in SpIndXstat.errorfloatnullableNameName of the sourcemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCompX-ray feature's namemeta.idcharSepa[0.02/10]? Angular X-ray/radio offsetarcsecpos.angDistance;arith.difffloatnullablee_Sepa[0.01/0.7]? Uncertainty in Sepaarcsecstat.errorfloatnullabler_Sepa[1/45]? Reference for previous Sepa (see refs.dat file)meta.ref;pos.frameintnullableTypeType of the offset (1)src.classcharr_SpIndX[1/37]? Reference for SpIndX (see refs.dat file)meta.ref;pos.frameintnullablenuR[1.4/20.16]? Radio frequencyGHzem.freqfloatnullableFR[0.18/11600]? Radio flux at nuRmJyphot.flux.density;em.radiodoublenullableFX[0.09/293.1] X-ray flux at 1keVnJyphot.flux;em.X-rayfloatr_FX[1/31]? Reference for FX (see refs.dat file)meta.ref;pos.frameintnullableRatio[0.01/597]? X-ray-to-radio flux ratioarith.ratio;em.X-ray;em.radiofloatnullable