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Title: Fermi Large Area Telescope Fourth Source Catalog

Journal Article · · The Astrophysical Journal. Supplement Series (Online)
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We present the fourth Fermi Large Area Telescope catalog (4FGL) of γ-ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, it is the deepest yet in this energy range. Relative to the 3FGL catalog, the 4FGL catalog has twice as much exposure as well as a number of analysis improvements, including an updated model for the Galactic diffuse γ-ray emission, and two sets of light curves (one-year and two-month intervals). The 4FGL catalog includes 5064 sources above 4σ significance, for which we provide localization and spectral properties. Seventy-five sources are modeled explicitly as spatially extended, and overall, 358 sources are considered as identified based on angular extent, periodicity, or correlated variability observed at other wavelengths. For 1336 sources, we have not found plausible counterparts at other wavelengths. More than 3130 of the identified or associated sources are active galaxies of the blazar class, and 239 are pulsars.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1608579
Journal Information:
The Astrophysical Journal. Supplement Series (Online), Journal Name: The Astrophysical Journal. Supplement Series (Online) Journal Issue: 1 Vol. 247; ISSN 1538-4365
Publisher:
American Astronomical Society/IOPCopyright Statement
Country of Publication:
United States
Language:
English

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Australia Telescope Compact Array observations of Fermi unassociated sources journal April 2013
Fermi LAT observation of supernova remnant HB9 journal August 2014
Blazar flaring patterns (B-FlaP) classifying blazar candidate of uncertain type in the third Fermi -LAT catalogue by artificial neural networks journal July 2016
Detection of gamma-ray emission from globular clusters M15, NGC 6397, 5904, 6218 and 6139 with Fermi -LAT journal March 2016
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The First FERMI LAT Supernova Remnant Catalog text January 2016
Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of FERMI Large Area Telescope Data text January 2016
Deep Morphological and Spectra Study of the SNR RCW 86 with FERMI-LAT text January 2016
FERMI/LAT Study of Gamma-Ray Emission in the Direction of the Monoceros Loop Supernova Remnant text January 2016
Search for Extended Sources in the Galactic Plane Using Six Years of Fermi -Large Area Telescope Pass 8 Data above 10 GeV text January 2017
The second catalog of flaring gamma-ray sources from the Fermi All-sky Variability Analysis text January 2017
3FHL: The Third Catalog of Hard Fermi -LAT Sources text January 2017
The $γ$-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT text January 2018
A Decade of Gamma-Ray Bursts Observed by Fermi -LAT: The Second GRB Catalog text January 2019
Optical Spectroscopic Observations of Gamma-Ray Blazar Candidates. v. tng, Kpno, and oan Observations of Blazar Candidates of Uncertain type in the Northern Hemisphere journal January 2016
Optical Spectroscopic Observations of Gamma-Ray Blazar Candidates. vi. Further Observations from tng, wht, oan, Soar, and Magellan Telescopes journal March 2016
FERMI LAT DISCOVERY OF EXTENDED GAMMA-RAY EMISSIONS IN THE VICINITY OF THE HB 3 SUPERNOVA REMNANT journal February 2016
DEEP MORPHOLOGICAL AND SPECTRAL STUDY OF THE SNR RCW 86 WITH FERMI -LAT journal March 2016
FERMI LARGE AREA TELESCOPE DETECTION OF EXTENDED GAMMA-RAY EMISSION FROM THE RADIO GALAXY FORNAX A journal July 2016
FERMI- LAT GAMMA-RAY DETECTIONS OF CLASSICAL NOVAE V1369 CENTAURI 2013 AND V5668 SAGITTARII 2015 journal July 2016
STUDYING THE SGR 1806-20/Cl* 1806-20 REGION USING THE FERMI LARGE AREA TELESCOPE journal August 2016
THE INFRARED–GAMMA-RAY CONNECTION: A WISE VIEW OF THE EXTRAGALACTIC GAMMA-RAY SKY journal August 2016
FERMI /LAT STUDY OF GAMMA-RAY EMISSION IN THE DIRECTION OF THE MONOCEROS LOOP SUPERNOVA REMNANT journal October 2016
2FHL: THE SECOND CATALOG OF HARD FERMI -LAT SOURCES journal January 2016
THE IBIS SOFT GAMMA-RAY SKY AFTER 1000 INTEGRAL ORBITS journal March 2016
DEVELOPMENT OF THE MODEL OF GALACTIC INTERSTELLAR EMISSION FOR STANDARD POINT-SOURCE ANALYSIS OF FERMI LARGE AREA TELESCOPE DATA journal April 2016
THE FIRST FERMI LAT SUPERNOVA REMNANT CATALOG journal May 2016
Identifying the 3FHL Catalog. II. Results of the KOSMOS Optical Spectroscopy Campaign journal October 2018
GAMMA-RAY UPPER LIMITS ON MAGNETARS WITH SIX YEARS OF FERMI -LAT OBSERVATIONS journal January 2017
On the Redshift of TeV BL Lac Objects journal March 2017
Observations of M31 and M33 with the Fermi Large Area Telescope: A Galactic Center Excess in Andromeda? journal February 2017
Gamma-Ray Emission of the Kes 73/1E 1841-045 Region Observed with the Fermi Large Area Telescope journal March 2017
Radio Follow-up on All Unassociated Gamma-Ray Sources from the Third Fermi Large Area Telescope Source Catalog journal April 2017
Detection of GeV Gamma-Rays from HESS J1534−571 and Multiwavelength Implications for the Origin of the Nonthermal Emission journal June 2017
Search for Extended Sources in the Galactic Plane Using Six Years of Fermi -Large Area Telescope Pass 8 Data above 10 GeV journal July 2017
Spectroscopy of 10 γ -Ray BL Lac Objects at High Redshift journal July 2017
GeV Detection of HESS J0632+057 journal September 2017
The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis journal August 2017
High-energy Gamma Rays from the Milky Way: Three-dimensional Spatial Models for the Cosmic-Ray and Radiation Field Densities in the Interstellar Medium journal August 2017
Optical Spectroscopic Survey of a Sample of Unidentified Fermi Objects journal December 2017
GeV Emission in the Region of HESS J1809−193 and HESS J1813−178: Is HESS J1809−193 a Proton Pevatron? journal May 2018
High-redshift BL Lac Objects: Spectroscopy of Candidates journal July 2018
Searching a Thousand Radio Pulsars for Gamma-Ray Emission journal January 2019
A Decade of Gamma-Ray Bursts Observed by Fermi -LAT: The Second GRB Catalog journal June 2019
A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Data Release 12 journal April 2017
3FHL: The Third Catalog of Hard Fermi -LAT Sources journal September 2017
The 105-Month Swift -BAT All-sky Hard X-Ray Survey journal March 2018
The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope journal August 2018
An Updated Catalog of Giant Radio Sources journal September 2018
THE FIRST DETECTION OF GeV EMISSION FROM AN ULTRALUMINOUS INFRARED GALAXY: Arp 220 AS SEEN WITH THE FERMI LARGE AREA TELESCOPE journal April 2016
CONSTRAINING GAMMA-RAY EMISSION FROM LUMINOUS INFRARED GALAXIES WITH FERMI -LAT; TENTATIVE DETECTION OF ARP 220 journal May 2016
The rotational broadening of V395 Car - implications on compact object's mass text January 2007
Identification of the Early Fermi LAT Gamma-Ray Bright Objects with Extragalactic VLBI sources text January 2009
Fermi-LAT Discovery of Extended Gamma-ray Emission in the Direction of Supernova Remnant W51C text January 2009
A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope text January 2010
Simultaneous Planck, Swift, and Fermi observations of X-ray and gamma-ray selected blazars text January 2011
Fermi Large Area Telescope Observations of the Cygnus Loop Supernova Remnant text January 2011
Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium text January 2012
Identification of the infrared non-thermal emission in Blazars text January 2012
The observed properties of dwarf galaxies in and around the Local Group text January 2012
Gamma-Ray Active Galactic Nucleus Type through Machine-Learning Algorithms text January 2012
Australia Telescope Compact Array observations of Fermi unassociated sources text January 2013
Swift X-ray Telescope Monitoring of Fermi-LAT Gamma Ray Sources of Interest text January 2013
Photometrically Triggered Keck Spectroscopy of Fermi BL Lac Objects text January 2013
A state change in the missing link binary pulsar system PSR J1023+0038 text January 2013
Optical spectroscopic observations of gamma-ray blazars candidates I: preliminary results text January 2014
Fermi LAT Observation of Supernova Remnant HB9 text January 2014
Unveiling the nature of the unidentified gamma-ray sources VI: gamma-ray blazar candidates in the WISH survey and their radio properties text January 2015
Optical spectroscopic observations of blazars and gamma-ray blazar candidates in the Sloan Digital Sky Survey Data Release Nine text January 2015
Fermi LAT Discovery of Extended Gamma-Ray Emissions in the Vicinity of the HB3 Supernova Remnant text January 2016
Deep morphological and spectral study of the SNR RCW 86 with Fermi-LAT text January 2016
Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data text January 2016
Search for Gamma-ray Emission from Dark Matter Annihilation in the Small Magellanic Cloud with the Fermi Large Area Telescope text January 2016
Planck intermediate results. XLVIII. Disentangling Galactic dust emission and cosmic infrared background anisotropies text January 2016
Optical archival spectra of blazar candidates of uncertain type in the 3$^{rd}$ Fermi Large Area Telescope Catalog text January 2016
H.E.S.S. observations of RX J1713.7-3946 with improved angular and spectral resolution; evidence for gamma-ray emission extending beyond the X-ray emitting shell text January 2016
HI4PI: A full-sky HI survey based on EBHIS and GASS text January 2016
3FHL: The Third Catalog of Hard Fermi-LAT Sources text January 2017
FRII{\sl{CAT}}: A FIRST catalog of FR~II radio galaxies text January 2017
Optical spectroscopic survey of a sample of Unidentified Fermi objects text January 2017
Disentangling hadronic from leptonic emission in the composite SNR G326.3$-$1.8 text January 2018
The first catalog of Fermi-LAT sources below 100 MeV text January 2018
Identifying the 3FHL catalog: I. Results of the KOSMOS optical spectroscopy campaign text January 2018
Optical Spectroscopic Observations of Gamma-Ray Blazar Candidates. VII. Follow-up Campaign in the Southern Hemisphere text January 2019
Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope text January 2019
Optical characterization of WISE selected blazar candidates text January 2019
SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue text January 2003
HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere text January 2004
Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631 text January 2005
Can Astrophysical Gamma Ray Sources Mimic Dark Matter Annihilation in Galactic Satellites? text January 2006
An Intense Gamma-Ray Flare of PKS1622-297 text January 1996

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Contribution of starburst nuclei to the diffuse gamma-ray and neutrino flux journal March 2020
VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multiwavelength Study journal June 2020
Unraveling the Complex Behavior of Mrk 421 with Simultaneous X-Ray and VHE Observations during an Extreme Flaring Activity in 2013 April journal June 2020


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