A search for new sources below 100 MeV in the Fermi-LAT data

  • G. PrincipeEmail author
  • D. Malyshev
  • J. Ballet
  • S. Funk
A decade of AGILE
Part of the following topical collections:
  1. A Decade of AGILE: Results, Challenges and Prospects of Gamma-Ray Astrophysics
  2. A Decade of AGILE: Results, Challenges and Prospects of Gamma-Ray Astrophysics
  3. A Decade of AGILE: Results, Challenges and Prospects of Gamma-Ray Astrophysics


The Fermi Large Area Telescope (LAT) has discovered more than 3000 sources between 100 MeV and 300 GeV (3FGL), including over 200 \(\gamma \)-ray pulsars. The majority of these pulsars have their spectral energy peaks (in \(\nu F_{\nu }\)) above 1 GeV. There exists another population of very energetic, young rotation-powered pulsars having non-thermal hard X-ray emission with spectral energy distributions (SEDs) peaking around 1 MeV, but having no detected emission by Fermi LAT above 100 MeV. Previous analyses of point sources in the gamma ray range were done only below 30 MeV (COMPTEL) or above 100 MeV (Fermi-LAT). Below 30 MeV, the imaging Compton telescope (COMPTEL) detected 26 steady sources in the energy range from 0.75 to 30 MeV. Since the Fermi LAT detects gamma rays down to 20 MeV, we create a list of sources detected in the energy range between 30 MeV and 100 MeV, using PGWave, a background-independent tool that makes use of a wavelet transform. This closes a gap of point source analysis between the COMPTEL catalog and the Fermi-LAT catalog and provides information and constraint for this missing MeV pulsar population.


Gamma rays: general-catalog Pulsars 



The Fermi-LAT Collaboration acknowledges support for LAT development, operation and data analysis from NASA and DOE (USA), CEA/Irfu and IN2P3/CNRS (France), ASI and INFN (Italy), MEXT, KEK, and JAXA (Japan), and the K.A. Wallenberg Foundation, the Swedish Research Council and the National Space Board (Sweden). Science analysis support in the operations phase from INAF (Italy) and CNES (France) is also gratefully acknowledged.


  1. Acero F, Ackermann M, Ajello M (2015) Fermi large area telescope third source catalog. Astrophys J Suppl 44:25Google Scholar
  2. Atwood WB, Abdo AA, Ackermann M (2009) The large area telescope on the Fermi gamma-ray space telescope mission. Astrophys J 697:1071CrossRefGoogle Scholar
  3. Atwood W, Albert A, Baldini L, et al. (2013) arXiv:1303.3514
  4. Damiani F, Maggio A, Micela G, Sciortino S (1997) A method based on wavelet transforms for source detection in photon-counting detector images. I. Theory and general properties. Astrophys J 483:350CrossRefGoogle Scholar
  5. De Angelis A, Tatischeff V, Tavani M (2017) The e-ASTROGAM mission. Exp Astron 44:25CrossRefGoogle Scholar
  6. Harding AK, Kalapotharakos C (2017) Proceedings of the 7th International Fermi SymposiumGoogle Scholar
  7. Hartman RC, Bertsch DL, Fichtel CE et al (1992) NASA Conference Publication, 3137Google Scholar
  8. Hartman RC, Bertsch DL, Bloom SD (1999) The third EGRET catalog of high-energy gamma-ray sources. Astrophys J Suppl 123:79CrossRefGoogle Scholar
  9. Kuiper L, Hermsen W (2015) Monthly Notices of the RAS 449:3827Google Scholar
  10. Kuiper L, Hermsen W, Dekker A (2018) Monthly Notices of the RAS 475:1238Google Scholar
  11. McEnery JE. (2017) AAS/High Energy Astrophysics Division #16, 16, 103.13Google Scholar
  12. Principe G, Malyshev D (2017) 6th International Symposium on High Energy Gamma-Ray Astronomy, 1792, 070016Google Scholar
  13. Principe G, Malyshev D, Funk S (2018) arXiv:1802.02913
  14. Principe G, Malyshev D, Ballet J (2018) The first catalog of Fermi-LAT sources below 100 MeV. Astron Astrophys 618:A22CrossRefGoogle Scholar
  15. Schönfelder V, Bennett K, Blom JJ (2000) The first COMPTEL source catalogue. Astron Astrophys Suppl 143:145CrossRefGoogle Scholar

Copyright information

© Accademia Nazionale dei Lincei 2019

Authors and Affiliations

  1. 1.Erlangen Centre for Astroparticle PhysicsErlangenGermany
  2. 2.AIM-DAp, CEASaclayFrance

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