J/ApJ/922/197ivo://CDS.VizieR/J/ApJ/922/197doi:10.26093/cds/vizier.19220197CDSWojtowicz A.Stawarz L.Machalski J.Ostorero L.2023-07-03T14:08:41Z2023-05-03T07:01:21ZCDS support team

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

cds-question@unistra.frradio-galaxiesactive-galactic-nucleiintergalactic-mediumThe dynamical evolution and radiative properties of luminous radio galaxies and quasars of the FR II type, are well understood. As a result, through the use of detailed modeling of the observed radio emission of such sources, one can estimate various physical parameters of the systems, including the density of the ambient medium into which the radio structure evolves. This, however, requires rather comprehensive observational information, i.e., sampling the broadband radio continua of the targets at several frequencies, and imaging their radio structures with high resolution. Such observations are, on the other hand, not always available, especially for high-redshift objects. Here, we analyze the best-fit values of the source physical parameters, derived from extensive modeling of the largest currently available sample of FR II radio sources, for which good-quality multiwavelength radio flux measurements could be collected. In the analyzed data set, we notice a significant and nonobvious correlation between the spectral index of the nonthermal radio emission continuum, and density of the ambient medium. We derive the corresponding correlation parameters, and quantify the intrinsic scatter by means of Bayesian analysis. We propose that the discovered correlation could be used as a cosmological tool to estimate the density of ambient medium for large samples of distant radio galaxies. Our method does not require any detailed modeling of individual sources, and relies on limited observational information, namely, the slope of the radio continuum between the rest-frame frequencies 0.4 and 5GHz, possibly combined with the total linear size of the radio structure.2021ApJ...922..197Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/922/197CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/204/151 : Bright radio sources at 178 MHz (3CRR) (Laing+ 1983)J/ApJS/80/501 : VLA survey of Abell clusters. II. (Owen+ 1992)J/A+AS/128/153 : Revised GB/GB2 sample of radio sources (Machalski 1998)J/AJ/124/1266 : Redshift survey around Abell 2199 (Rines+, 2002)J/ApJ/658/815 : Radio loudness of active galactic nuclei (Sikora+, 2007)J/ApJ/723/1119 : Optical properties of radio galaxies at z<0.3 (Lin+, 2010)J/MNRAS/415/1013 : FR II radio galaxies in SDSS (Koziel-Wierzbowska+, 2011)J/AJ/141/88 : Galaxy cluster environments of radio sources (Wing+, 2011)J/ApJ/756/116 : FR II radio galaxies from MaxBCG (Antognini+, 2012)J/ApJ/757/22 : Strong and weak lensing analysis of A2261 (Coe+, 2012)J/ApJ/783/52 : Redshifts in the field of A383 (Geller+, 2014)J/A+A/601/A81 : FIRST catalog of FR II radio galaxies (Capetti+, 2017)J/ApJ/871/129 : A redshift catalog of the galaxy cluster A2029 (Sohn+, 2019)J/ApJS/247/71 : Large-scale environment of radio gal. II. (Massaro+, 2020)J/ApJS/255/22 : FRII radio sources dynamical models (Machalski+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/922/197https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/922/197http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/922/197https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/922/197https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/922/197http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/922/197GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/922/197/table2 (*The the selected 271 FRII sources with the corresponding DYNAGE model data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/922/197/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/922/197/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/922/197/table2?GETtext/xml+votable180.050000true4.1316779.281030.0055555555555555565/1215 6/245 767 936-937 939 942-943 946 1129 2111 2136 2170 2225 2249 2292 2304 2306 2311 2313 2315 2317-2318 2321-2322 2324 2340 2364 2384 2396 2402 2466 2704 2866 2949 2951 3803 4014 4088 4285 4649 4822 4825-4827 4829-4831 4835 4837 4850 4854-4857 5005 5023 5027 5034 5048 5078 5086-5087 5116 5118 5206 5243 5260 5284 5295 5319 5355-5357 5371 5391 5396 5399 5411 5413 5415 5432 5435 5439-5440 5514 5553 5585 5588 5617 5671 5675 5692 5706 5712 5714 5758 5763 5768 5794 5806 5817 5845 5913 5929-5930 6075 6375 6379 6418 6430-6431 6437 6445 6454 6518 6536 6538 6611 6618 6640 6778 6986 7349 7383 7508 7763 7888 7920 7925 7959 8043 8116 8152 8357 8528 8555 8644 8675 8809 8927 9006 9022-9023 9042 9252 9273 9290 9349 9393 9398 9401 9437 9655 9742 9769 9992 10004 10052 10217 10318 10329 10355 10374 10482 10529 10686 10742-10743 10759 10774 10781 10787 10824 10839-10840 10849 10877 10881 10896 10899 10906 10925 10995 11073 11320 11336 11365 11377 11408 11652 11667 11874 12015 12250 12593 12796 13074 13455 13663 13707 13712 13855 14858 15045 15064 15909 16189 16221 16301 17115 17497 17934 18365 19745 19842 19857 20030 22364 23469 23476 23529 24023 24247 25704 27514 27784 27872 27955 28063 28279 28415 28540 28574 28603 28621 28626 28632 28638 28648 28652 28664 40433https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/922/197?format=asciiRadiodefaultJ/ApJ/922/197/table2*The the selected 271 FRII sources with the corresponding DYNAGE model dataSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.mainchar1+z[1/5.42] Spectroscopic redshiftsrc.redshift;pos.heliocentricfloatP1.4[0.00076/60.53] Observed power spectral density at 1.4GHz1e+26W.Hz**-1.sr**-1phot.flux.density;em.radio.750-1500MHzdoubleSize[9.6/2451] Total linear size, Dkpcphys.sizefloatAR[1.05/11] Aspect ratio of radio lobesphys.size.axisRatiofloattau[0.04/273] Jet lifetimeMyrtime.lifetimefloatQjet[0.0035/138] Total jet kinetic power; 10e+45erg/s1e+38Wphys.luminositydoublerho0a0[0.014/37] Scaled gaseous atmosphere central density (1)phys.densityfloatrho[0.02/886] Gas density at D/2 distance from host galaxy center1e-28g.cm**-3phys.densitydoublealpInj[0.45/0.8] Injection spectral indexspect.indexfloatalpha[0.56/1.24] Lobes' radio emission integrated spectral index (2)spect.indexfloatM21Display data for this object identifier in Machalski+, 2021, J/ApJS/255/22 if anymeta.ref.urlintnullableNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main