Fermi cat. of High-lat. Extended Sources (FHES) J/ApJS/237/32 ivo://CDS.VizieR/J/ApJS/237/32 doi:10.26093/cds/vizier/bb-7d-10 CDS Ackermann M. Ajello M. Baldini L. Ballet J. Barbiellini G.,Bastieri D. Bellazzini R. Bissaldi E. Blandford R.D. Bloom E.D.,Bonino R. Bottacini E. Brandt T.J. Bregeon J. Bruel P. Buehler R.,Cameron R.A. Caputo R. Caraveo P.A. Castro D. Cavazzuti E. Charles E.,Cheung C.C. Chiaro G. Ciprini S. Cohen-Tanugi J. Costantin D.,Cutini S. D'Ammando F. De Palma F. Desai A. Di Lalla N. Di Mauro M.,Di Venere L. Favuzzi C. Finke J. Franckowiak A. Fukazawa Y. Funk S.,Fusco P. Gargano F. Gasparrini D. Giglietto N. Giordano F.,Giroletti M. Green D. Grenier I.A. Guillemot L. Guiriec S. Hays E.,Hewitt J.W. Horan D. Johannesson G. Kensei S. Kuss M. Larsson S.,Latronico L. Lemoine-Goumard M. Li J. Longo F. Loparco F.,Lovellette M.N. Lubrano P. Magill J.D. Maldera S. Manfreda A.,Mazziotta M.N. McEnery J.E. Meyer M. Mizuno T. Monzani M.E.,Morselli A. Moskalenko I.V. Negro M. Nuss E. Omodei N. Orienti M.,Orlando E. Ormes J.F. Palatiello M. Paliya V.S. Paneque D.,Perkins J.S. Persic M. Pesce-rollins M. Piron F. Porter T.A.,Principe G. Raino S. Rando R. Rani B. Razzaque S. Reimer A.,Reimer O. Reposeur T. Sgro C. Siskind E.J. Spandre G. Spinelli P.,Suson D.J. Tajima H. Thayer J.B. Tibaldo L. Torres D.F. Tosti G.,Valverde J. Venters T.M. Vogel M. Wood K. Wood M. Zaharijas G.,Biteau J. The Fermi-lat Collaboration 2026-08-03T07:24:37Z 2023-10-26T11:39:18Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr gamma-ray-astronomy active-galactic-nuclei astronomical-object-identification redshifted We present a search for spatial extension in high-latitude (|b|>5{deg}) sources in recent Fermi point source catalogs. The result is the Fermi High-Latitude Extended Sources Catalog, which provides source extensions (or upper limits thereof) and likelihood profiles for a suite of tested source morphologies. We find 24 extended sources, 19 of which were not previously characterized as extended. These include sources that are potentially associated with supernova remnants and star-forming regions. We also found extended {gamma}-ray emission in the vicinity of the Cen A radio lobes and-at GeV energies for the first time-spatially coincident with the radio emission of the SNR CTA 1, as well as from the Crab Nebula. We also searched for halos around active galactic nuclei, which are predicted from electromagnetic cascades induced by the e^+^e^-^ pairs that are deflected in intergalactic magnetic fields. These pairs are produced when {gamma}-rays interact with background radiation fields. We do not find evidence for extension in individual sources or in stacked source samples. This enables us to place limits on the flux of the extended source components, which are then used to constrain the intergalactic magnetic field to be stronger than 3x10^-16^G for a coherence length {lambda}>~10kpc, even when conservative assumptions on the source duty cycle are made. This improves previous limits by several orders of magnitude. 2018ApJS..237...32A https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/237/32 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) IX/67 : Incremental Fermi LAT 4th (4FGL-DR3) (Fermi-LAT col., 2022) J/MNRAS/353/1311 : Long-term timing observations of 374 pulsars (Hobbs+, 2004) J/MNRAS/360/974 : Proper motionsof pulsars (Hobbs+, 2005) J/MNRAS/362/1189 : Proper motions of 74 pulsars (Zou+, 2005) J/A+A/545/A113 : MOJAVE IX. Core shift effects (Pushkarev+, 2012) J/A+A/551/A97 : Lockman Hole/XMM VLBI observations (Middelberg+, 2013) J/ApJS/208/17 : 2nd Fermi LAT cat. of gamma-ray pulsars (2PC) (Abdo+, 2013) J/AJ/147/14 : The mJIVE-20 catalog (Deller+, 2014) J/AJ/150/58 : VLBI ICRF2 (Fey+, 2015) J/MNRAS/453/2599 : Fermi-LAT pulsar spectral data (Vigano+, 2015) J/ApJS/217/2 : Refined associations of Fermi/LAT sources (Massaro+, 2015) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) J/ApJS/224/8 : The first Fermi LAT SNR catalog (1SC) (Acero+, 2016) J/ApJ/820/8 : 3FGL sources statistical classif. (Saz Parkinson+, 2016) J/MNRAS/458/3341 : 42 ms pulsars high-precision timing (Desvignes+, 2016) J/MNRAS/462/3180 : 3FGL Blazar of Unknown Type classification (Chiaro+, 2016) J/ApJS/232/18 : The third Fermi-LAT >10GeV catalog (3FHL) (Ajello+, 2017) J/A+A/602/A86 : Blazar cand. among Fermi/LAT 3FGL cat. (Lefaucheur+, 2017) J/MNRAS/470/1291 : Classifying 3FGL with ANN (Salvetti+, 2017) J/MNRAS/485/1822 : AGN core shift measurements (Plavin+, 2019) J/MNRAS/490/4770 : Classifying Fermi-LAT gamma-ray sources (Kovacevic+, 2019) J/ApJ/892/105 : 4th cat. of Fermi LAT-detected AGNs (4LAC) (Ajello+, 2020) J/ApJ/916/28 : Cross-match between Swift-BAT & Fermi-LAT (Tsuji+, 2021) J/ApJS/254/26 : Identifying 3FHL. V. CTIO-COSMOS spectra (Rajagopal+, 2021) J/A+A/660/A87 : Machine learning methods with Fermi-LAT cat. (Bhat+, 2022) http://fermi.gsfc.nasa.gov/ssc/data/analysis/documentation/Cicerone/ Cicerone_Data/LAT_DP.html : Fermi Support Center on NASA webpage https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/237/32 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/237/32 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/237/32 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/237/32 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/237/32 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/237/32 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/237/32/catalog (Fermi catalog of high-latitude (|b|>5{deg}) extended sources (FHES) with best-fit parameters and likelihood ratios) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/237/32/catalog? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/237/32/catalog? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/237/32/catalog? 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47306 47319 47327 47375 47398 47407 47413 47419 47442 47447 47460-47461 47466 47479 47487 47497 47512 47529 47534 47540 47605 47630 47636 47649 47655 47675 47708 47714 47720 47777 47828 47866 47894 47912 47942 47960-47961 47969 48019 48023 48090 48100 48123 48154 48193 48201 48227 48245 48259 48274 48306 48352 48388 48398 48407 48419 48443 48446 48528 48580 48589 48595 48603 48624 48629 48670 48685 48699 48778 48798 48829 48841 48845 48854 48858 48868 48878 48885 48933 48951 48962 48985 48995 49037 49043 49053 49068 49071 49083 49141-49142 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/237/32?format=ascii Gamma-ray default J/ApJS/237/32/catalog Fermi catalog of high-latitude (|b|>5{deg}) extended sources (FHES) with best-fit parameters and likelihood ratios Simbad Simbad column added by the CDS meta.ref.url char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int 3FGL 3FGL source association (assoc_3fgl) meta.id.assoc char 3FHL 3FHL source association (assoc_3fhl) meta.id.assoc char FL8Y Name of associated source in preliminary LAT 8yr point source list (assoc_fl8y) meta.id.assoc char SepLAT [0.0001/0.7]? Angular separation between FHES source and associated source in FL8Y (sep_fl8y) deg pos.angDistance double nullable Assoc Source association from 3FGL (column ASSOC1) or 3FHL (column ASSOC) meta.id.assoc char Class Source class from 3FGL (column CLASS1) or 3FHL (column CLASS) meta.code.class char z [0.0018/3.11]? Redshift from 3FHL or 3LAC (redshift) src.redshift float nullable nupeak [2.9e+11/1.95e+18]? Synchrotron peak frequency from 3FHL or 3LAC (nupeak) Hz em.freq double nullable RAJ2000 Right ascension of 3FGL or 3FHL source (J2000) (RAJ2000) deg pos.eq.ra;meta.main DEJ2000 Declination of 3FGL or 3FHL source (J2000) (DEJ2000) deg pos.eq.dec;meta.main GLON Galactic longitude of 3FGL or 3FHL source deg pos.galactic.lon GLAT Galactic latitude of 3FGL or 3FHL source deg pos.galactic.lat double e68Pos [0.0014/0.3] Symmetric statistical error (68%) on position (pos_r68) deg stat.error double s68Pos [0/1.1] Symmetric systematic error (68%) on position (pos_r68_sys) deg stat.error.sys;pos double e95Pos [0.002/0.5] Symmetric statistical error (95%) on position (pos_r95) deg stat.error double Index [0.08/7.2] Spectral slope at 1GeV spect.index double e_Index [0/2.2] Statistical error on index (index_err) stat.error;spect.index double s_Index [0/0.6] Systematic error (1{sigma}) on index (index_sys_err) stat.error.sys;spect.index double SpMod Spectral type (PowerLaw, LogParabola, PLSuperExpCutoff) (SpectrumType) meta.id;stat.fit char ts [16/170674] Detection test statistic stat.fit.param double tsExt [0/367] Extension test statistic TS_ext_ (ts_ext) stat.fit.param double tsExtsys [0/256] Minimum extension test statistic (TS_ext_) under bracketing models for systematics (ts_ext_sys) stat.fit.param double tsHalo [-0.0041/77.7] Halo test statistic TS_halo_ (ts_halo) stat.fit.param float Flux [3e-11/1.1e-07] Integrated photon flux (1GeV-1TeV) cm**-2.s**-1 phot.flux.density;em.gamma.hard double e_Flux [1.6e-11/1.2e-09] Statistical error (1{sigma}) on Flux (flux_err) cm**-2.s**-1 stat.error;phot.flux double s_Flux [0/2.9e-09] Systematic error (1{sigma}) on Flux (flux_sys_err) cm**-2.s**-1 stat.error.sys;phot.flux double EFlux [2.6e-07/0.0004] Integrated energy flux (1GeV-1TeV) MeV.cm**-2.s**-1 phot.flux;em.gamma double e_EFlux [7.4e-08/1.4e-05] Statistical error (1{sigma}) on EFlux (eflux_err) MeV.cm**-2.s**-1 stat.error double Model Best-fit spatial morphology (RadialGaussian, RadialDisk, PointSource) (ext_model) meta.id;stat.fit char Rext [0.003/2] Best-fit extension (ext_r68) deg phys.angSize;meta.modelled float e_Rext [0.0028/0.4]? Statistical error (1{sigma}) on Rext (ext_r68_err) deg stat.error float nullable s_Rext [0/0.9] Systematic error (1{sigma}) on Rext (ext_r68_sys_err) deg stat.error.sys float B_Rext [0.017/2.3]? 95% CL upper limit on Rext (ext_r68_ul95) deg phys.angSize;meta.modelled;stat.max float nullable 3LAC Display data from the 3LAC (Ackermann+ 2015, J/ApJ/810/14) meta.ref.url int nullable Name Source designation (3FGL JHHMM.m+DDMMc; 3FHL or FHES JHHMM.m+DDMM) meta.id;meta.main char