Roma-BZCAT synchrotron peak & Compton dominance J/ApJ/841/113 ivo://CDS.VizieR/J/ApJ/841/113 doi:10.26093/cds/vizier.18410113 CDS Mao P. Urry C.M. 2023-12-19T11:07:34Z 2018-03-02T09:28:41Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr bl-lacertae-objects quasars We investigate a sample of 622 blazars with measured fluxes at 12 wavebands across the radio-to-gamma-ray spectrum but without spectroscopic or photometric redshifts. This sample includes hundreds of sources with newly analyzed X-ray spectra reported here. From the synchrotron peak frequencies, estimated by fitting the broadband spectral energy distributions (SEDs), we find that the fraction of high-synchrotron-peaked blazars in these 622 sources is roughly the same as in larger samples of blazars that do have redshifts. We characterize the no-redshift blazars using their infrared colors, which lie in the distinct locus called the WISE blazar strip, then estimate their redshifts using a KNN regression based on the redshifts of the closest blazars in the WISE color-color plot. Finally, using randomly drawn values from plausible redshift distributions, we simulate the SEDs of these blazars and compare them to known blazar SEDs. Based on all these considerations, we conclude that blazars without redshift estimates are unlikely to be high-luminosity, high- synchrotron-peaked objects, which had been suggested in order to explain the "blazar sequence"-an observed trend of SED shape with luminosity-as a selection effect. Instead, the observed properties of no-redshift blazars are compatible with a causal connection between jet power and electron cooling, i.e., a true blazar sequence. 2017ApJ...841..113M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/841/113 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) VIII/59 : the FIRST Survey, version 1999Jul (White+ 1999) V/139 : The SDSS Photometric Catalog, DR9 (Adelman-McCarthy+, 2012) V/147 : The SDSS Photometric Catalog, DR12 (Alam+, 2015) J/MNRAS/323/757 : Deep X-Ray Radio Blazar Survey (DXRBS). II. (Landt+, 2001) J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006) J/A+A/488/867 : Synchrotron peak frequency of 135 AGN (Nieppola+, 2008) J/A+A/495/691 : Multifrequency catalog of blazars Roma-BZCAT (Massaro+, 2009) J/ApJ/748/68 : WISE IR colors of gamma-ray blazars (D'Abrusco+, 2012) J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013) J/ApJS/206/12 : Blazars with {gamma}-ray counterparts. I. (D'Abrusco+, 2013) J/ApJS/215/14 : WISE {gamma}-ray blazar radio candidates (D'Abrusco+, 2014) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) J/ApJ/810/14 : Third catalog of LAT-detected AGNs (3LAC) (Ackermann+, 2015) J/ApJS/224/26 : SEDs of Roma BZCAT blazars (Mao+, 2016) http://www.sdss3.org/ : SDSS-III home page http://www.asdc.asi.it/bzcat/ : Roma BZCAT - 5th edition home page http://fermi.gsfc.nasa.gov/ssc/data/access/lat/4yr_catalog/ : 3FGL home page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/841/113 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/841/113 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/841/113 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/841/113 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/841/113 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/841/113 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/841/113/table3 (*Synchrotron peak and Compton dominance for samples I and II) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/841/113/table3? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/841/113/table3? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/841/113/table3? 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48846 48878 48883 48893 48926 48965 48974-48975 48985 48989 48995 49019 49037 49069 49071 49084 49141 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/841/113?format=ascii default J/ApJ/841/113/table3 *Synchrotron peak and Compton dominance for samples I and II n_logPkC Note on logPkC (4) meta.note char logPkCr [18/25]? Log rest frame Compton peak frequency (2) log(Hz) em.freq float nullable n_logPkCr Note on logPkCr (4) meta.note char AC [-1.5/2.1]? Compton Dominance in observed frame (f_peak,C_/f_peak,s_) stat.fit.param float nullable ACr [-1.1/2.6]? Compton Dominance corrected to rest frame (L_peak,C_/L_peak,s_; only for Sample I) stat.fit.param float nullable PapI Display data from Paper I (Mao+, 2016, J/ApJS/224/26) if any meta.ref.url int nullable SimbadName Simbad column added by the CDS meta.id char nullable NED NED column added by the CDS meta.ref.url char _RA Right Ascension (J2000) from SIMBAD (not part of the original data) deg pos.eq.ra;meta.main _DE Declination (J2000) from SIMBAD (not part of the original data) deg pos.eq.dec;meta.main recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int BZCAT BZCAT identifier (1) meta.id;meta.main char logPk [12/18]? Log observed frame synchrotron peak frequency (2) log(Hz) em.freq float nullable n_logPk Note on logPk (3) meta.note char logPkr [12/18]? Log rest frame synchrotron peak frequency (2) log(Hz) em.freq float nullable n_logPkr Note on logPkr (3) meta.note char logPkC [19/25]? Log observed frame Compton peak frequency (2) log(Hz) em.freq float nullable