J/A+A/693/A142ivo://CDS.VizieR/J/A+A/693/A142doi:10.26093/cds/vizier.36930142CDSMarchesi S.Iuliano A.Prandini E.Da Vela P.Doro M.Loporchio S.,Miceli D.Righi C.Zanin R.Bronzini E.Vignali C.2025-03-03T20:01:11Z2025-01-13T08:23:55ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsactive-galactic-nucleix-ray-sourcesgamma-ray-astronomyWe present the results of a multi-wavelength study of blazars selected from the 5th ROMABZCAT catalog. We selected from this sample a subsample of 2435 objects having at least one counterpart in one of the three main archival X-ray catalogs, which is, the fourth release of the XMM-Newton Survey Science Catalogue, the second release of the Chandra Source Catalog, and the second Swift X-ray Point Source catalog of detections by Swift-XRT, or in the recently released eROSITA-DE Data Release 1 catalog. We first searched for different multi-wavelength trends between sources with a Gamma-ray counterpart in the Fermi-LAT 14-year Source Catalog (4FGL-DR4) and sources lacking one. We find that the non-4FGL sources are on average fainter both in the X-rays and in the radio with respect to the 4FGL-detected ones, but the two samples have similar X-ray-to-radio flux ratios, as well as synchrotron peak frequencies. We then focused on the 1007 non-Gamma-ray detected population, to determine if there is a sample of X-ray sources that could be TeV emitters. We find that a large number of sources, mostly BL Lacs or BL Lacs with host-galaxy contribution to the spectral energy distribution, have large synchrotron peak frequency and X-ray to radio flux ratio, two properties that characterize the vast majority of known TeV emitters. With respect to these known TeV emitters, our targets have X-ray fluxes ~1 order of magnitude fainter. We then computed the 0.2-12keV and 20GeV-300TeV fluxes for the known 5BZCAT TeV emitters, and determined the existence of a direct correlation between X-ray and TeV fluxes in the BL Lacs population. We used this trend to estimate the VHE flux of our targets, and found a promising sample of sources for follow-up observations with current or future, more sensitive, Cherenkov telescopes, first and foremost the Cherenkov Telescope Array Observatory.2025A&A...693A.142Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A142CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015)IX/69 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR13 (Webb+, 2023)IX/58 : 2SXPS Swift X-ray telescope point source catalogue (Evans+, 2020)IX/57 : The Chandra Source Catalog (CSC), Release 2.0 (Evans+, 2019)J/A+A/682/A34 : SRG/eROSITA all-sky survey catalogs (eRASS1) (Merloni+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/693/A142https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/693/A142http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/693/A142https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/693/A142https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/693/A142http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/693/A142GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/693/A142/catalog (Catalog of the 1007 sources without a 4FGL counterpart)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A142/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A142/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A142/catalog?GETtext/xml+votable180.050000true0.0849583-32.35027780.0055555555555555566/1 48 172 304 594 731 975 1222 1419 1702 1988 2098 2334 2397 2441 2464 2469 2564 2628 2631 2710 3971 4027 4098 4122 4141 4143 4146 4168 4210 4260 4318 4405 4436 4446 4472 4475 4477 4486 4543 4594 4601 4612 4627 4634 4638 4684 4686 4696 4741 4754 4831 4862 4866 4892 4902 4923 4963 4968 5001 5033 5107 5119 5163 5170 5200 5222 5303 5305 5312 5345 5349 5367 5371 5470 5506 5510 5535 5552 5569 5584 5598 5625 5630 5637 5652 5657 5676-5677 5698 5703 5717 5758 5767 5769 5773 5778 5781 5800-5801 5814 5858 5881 5984 5988 6013 6015 6037-6038 6117 6153 6161 6170 6174 6193 6223 6234 6242-6244 6252 6267 6367 6377 6381 6399 6409 6422 6457 6464 6468 6477 6483 6487 6519 6529 6531 6554 6582 6623 6629 6646 6648 6686 6747 6751 6790 6848 6853 6882 6940 6962 7128-7129 7169 7222 7266 7285 7301 7316 7343 7351 7371 7396 7436 7452 7475 7564 7604 7618 7642 7745 7857 7942 8175 8216 8220 8227 8345 8556 8711 8714 8912 8950 9047 9104 9150-9151 9165 9168 9372 9402 9406 9452 9455 9470 9482 9497 9536 9604 9614 9618 9664 9705 9707 9732 9747 9754 9796 9914 9960 9976 9999 10006 10020 10061 10071 10137 10153 10250 10321 10336-10337 10343 10401 10472 10491 10510 10518 10570-10571 10592 10598 10650 10694 10706 10748 10805 10815 10877 10943 10969 10974 10977 10992 10999 11043 11064 11087 11091 11094 11118 11124 11126 11160 11178 11191 11260 11312 11402 11426 11467 11514 11529 11557 11589 11608 11686 11845 12241 12471 12547 12580 12632 12896 13359 13380 13496 13504 13545 13578 14737 14905 15036 15143 15153 15344 15819 15936 16302 16434 16444 16606 16649 16714 16758 16891 16952 17110 17188 17213 17492 17558 17693 17703 17734 17785 17898 17979 17997 18005 18019 18048 18075 18090 18158 18184 18209 18242 18271 18324 18402 18409 18627 18726 18749 18756 18772 18852 18865 18907 19033 19061 19099 19166 19253 19327 19411 19436 19487 19567 19609 19872 19882-19883 19905 19996-19997 20018 20072 20156 20224 20358 20395 20460 20550 20609 20678 20689 20703 20768 20770 20873 20912 20969 20974 21010 21012 21020 21028 21049 21060 21117 21131 21147 21154 21163 21170 21191 21196 21254 21266 21298 21445 21554 21704 21763 21790 21844 21886 21903 22184 22328 22375 22554 22563 22659 22703 22722 22724 22789 22856-22857 22894 22914 22926 22947 22978 22993 23016 23030 23099 23103 23181 23195 23210 23261 23304 23355 23416 23420 23427 23478 23547-23548 23761 23805 24346 24415 24658 24681 24724 24796 24809 24814 24828 24870 24931 25033 25094 25112 25126 25128 25131 25174 25211 25213 25245 25256 25284 25299 25307 25348 25354 25413 25427-25428 25493 25511 25572 25580 25630 25647 25650 25654 25659 25677-25678 25693 25707 25742 25800 25816 25824 25855 25863 25934 25937 25948 25956 25983 25991 26000 26003 26027 26035 26083 26087 26089-26090 26107 26115 26119 26198 26207 26220-26221 26225 26243 26245 26247 26259 26277-26278 26282-26283 26297 26322 26335 26344-26345 26362 26365 26446 26466 26520 26523 26563 26568 26596 26602 26614 26624 26650 26696 26755 26806 26816 26852 26878 26885 26905 26946 26966 26975 26983 26985 27034 27076 27080 27082 27095-27096 27101 27124 27131 27133 27145-27146 27212 27214 27219 27230 27246-27247 27249 27263 27289-27290 27302 27321 27324 27405 27417 27428 27446 27464 27520 27559 27583 27595 27603 27611 27622 27641 27653 27657 27659 27675 27711 27715 27726 27796-27797 27812 27845 27905 27962 28002 28208 28210 28214 28227 28248 28258 28277 28315 28343 28383 28471 28476 28478 28481 28495 28516 28589 28595 28616 28643 29795 29925 29991 30131 30193 30388 30757 30772 30836 30923 31176 31211 31274 31355 31389 31472 31529 31547 31857 31995 32160 32163 32247 32289 32674 32764 32871 32874 32897 32902 32916 32961 32968 32979 32994 33000 33011 33057 33107 33137 33189 33247 33259 33378 33398 33460 33489 33611 33634 33648 33656 33659 33665 33703 33740 33752 33789 33795 33816 33823 33827 33829 33967 33973 34009 34026 34041 34044 34050 34097 34117 34146 34168 34210 34233 34238 34271 34330 34371 34398 34406 34437 34489 34531 34568 34570-34572 34646 34656 34665 34669 34683 34691 34710 34856 34871 35016 35081 35136 35192 35281 35318 35440 35457 35484 35487 35491 35522 35532 35581 35631 35648 35651 35696 35704 35741 35758 35764 35769 35771 35781 35806 35849 35865 35897 35910 35918 35943 35952 36005 36042 36089 36117 36130 36139 36176 36211 36214 36219 36230 36264 36282-36283 36343 36407 36432 36459 36505 36520 36526 36558 36596 36609 36640 36655 36672 36735 36754 36769 36780 36784-36785 36818 36863 36871 36944 36972 36988 37032 37062 37091 37469 37474-37475 38128 38141 38199 38296 38303 38310 38350 38383 38397 38474 38502 38519 38638-38639 38646 38744 38788 38791 38880 38930 39004 39088 39522 39557 39566 39577 39592 39664 39740 40037 40060 40131 40141 40217 40247 40281 40300 40332 40339 40360 40515 40607 40635 40637 40642 40658 40710 40730 40795 40798 40902 40955 40959 40995 41043 41059 41238 41275 41356 41991 42076 42670 43293 43501 43530 43549 43628 43679 43694 43715 43739 43812 43830 43837 43850 43863 43865 43870 43884-43885 43908 43914-43916 43924 43929 43936 43945 43980 44034 44038 44075 44106 44128 44144 44166 44260 44269 44293 44310 44449 44513 44555 44563 44604 44663 44670 44699 44724 44729 44774 44776 44802 44818 44832 44899 44944 45158-45159 45165 45196-45197 45227 45286 45295 45303 45309 45393 45409 45424 45558 45575 45580 45599 45621 45648 45655 45660 45690 45699 45795 45803 45846 45923 45999 46040 46123 46175 46232 46246 46342 46354 46388 46459 46481 46490 46510 46521 46529 46546 46588 46615 46629 46724 46736 46851 46887 46932 46994 47001 47050 47107 47141 47187 47268 47319 47341 47354 47642 47656 47672 47805 47941 48137 48142 48292 48306 48316 48422 48477 48496 48610 48708 48757 48965 48975 48985 490199.276497240453405e-25 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/693/A142?format=asciiGamma-rayX-raydefaultJ/A+A/693/A142/catalogCatalog of the 1007 sources without a 4FGL counterpartrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint5BZCAT5BZCAT source ID, from Massaro et al. (2015. Cat. VII/274) (ID_5BZCAT)meta.id;meta.maincharRAJ2000Right Ascension (J2000), 5BZCAT source (RA_5BZCAT)pos.eq.ra;meta.mainDEJ2000Declination (J2000), 5BZCAT source (DEC_5BZCAT)pos.eq.dec;meta.mainz? Source redshift (Redshift)src.redshiftfloatnullableTypeObject classification from the 5BZCAT (BZB, BZG, BZQ, or BZU) (OBJECT_TYPE)meta.code.class;src.classcharRmag? Optical, R-band AB magnitude of the source, from the 5BZCAT (RMAG)magphot.mag;em.opt.RfloatnullableF1.5GHz1.4 GHz flux density of the source, from the 5BZCAT (FLUX_1P4_GHZ)mJyphot.flux.density;em.radio.750-1500MHzfloat4XMDR13Source ID from the 4XMM-DR13 catalog (ID_4XMDR13)meta.idcharRAX? Right Ascension (J2000), 4XMM-DR13 counterpart (RA_4XMMDR13)pos.eq.ranullableDEX? Declination (J2000), 4XMM-DR13 counterpart (DEC_4XMMDR13)meta.id.assoc;pos.eq.decnullable2CSCSource ID from the 2CSC catalog (ID_2CSC)meta.idcharRA2deg? Right Ascension (J2000), 2CSC counterpart (RA_2CSC)degpos.eq.ranullableDE2? Declination (J2000), 2CSC counterpart (DEC_2CSC)meta.id.assoc;pos.eq.decnullable2SXPSSource ID from the 2SXPS catalog (ID_2SXPS)meta.idcharRAS? Right Ascension (J2000), 2SXPS counterpart (RA_2SXPS)pos.eq.ranullableDES? Declination (J2000), 2SXPS counterpart (DEC_2SXPS)meta.id.assoc;pos.eq.decnullableeRASS1Source ID from the eRASS1 catalog (ID_eRASS1)meta.idcharRAR? Right Ascension (J2000), eRASS1 counterpart (RA_eRASS1)pos.eq.ranullableDER? Declination, (J2000), eRASS1 counterpart (DEC_eRASS1)meta.id.assoc;pos.eq.decnullablelogF02-12? 0.2-12keV flux (in erg/s/cm^2^) from one of the four X-ray catalogs, in this order of priority: 4XMM-DR13, 2CSC, 2SXPS, eRASS1 (Log_Flux_02-12)log(mW.m**-2)phot.flux;em.X-rayfloatnullableb_logF02-12? 90% confidence level lower boundary on the 0.2-12keV flux (Log_Flux_02-12_lo)log(mW.m**-2)phot.flux;em.X-ray.medium;phys.atmol.levelfloatnullableB_logF02-12? 90% confidence level upper boundary on the 0.2-12keV flux (Log_Flux_02-12_up)log(mW.m**-2)phot.flux;em.X-ray.medium;phys.atmol.levelfloatnullableRatio? 0.2-12keV to 1.4GHz flux ratio (X_ray_to_radio_rat)phot.flux;em.X-ray.medium;arith.ratiodoublenullablelognupeak? Logarithm of the blazar SED synchrotron peak computed using the Blazar Synchrotron Tool, BlaST (nu_peak_BLAST)log(Hz)em.freqfloatnullablee_lognupeakUncertainty on the logarithm of the blazar SED synchrotron peak computed using the Blazar Synchrotron Tool, BlaST (nu_peak_BLAST_err)log(Hz)stat.errorfloat