Extreme and high synchrotron peak blazars beyond 4FGL : the 2BIGB gamma-ray catalogue

Agradecimentos: During this work, BA was supported by São Paulo Research Foundation (FAPESP) with grant number 2017/00517-4. BA would like to thank Prof. Marcelo M. Guzzo for his support to this research proposal. BM thank Uppsala University International Science Programme (ISP) for the financial support towards developing this work. We thank the Centro de Computação John David Rogers CCJDR at IFGW Unicamp, Campinas-Brazil, for granting access to the Feynman and Planck Clusters. We thank IcraNet, Prof. Remo Ruffini and Prof. Carlo Bianco for the cooperation and granted access to Joshua Computer Cluster (Rome-Italy). The availability of computational resources was key to the development of our work. The VO publication of our data (vo.bsdc.icranet.org) is made by the Brazilian Science Data Center (BSDC) service maintained at CBPF, Rio de Janeiro, and accessible through the United Nations Open Universe Initiative at http://www.openuniverse.asi.it. We thank the entire Fermi-LAT collaboration for maintaining a public mission data base, which promotes discoveries involving the entire ?-ray community in a multitude of scientific efforts. We thank J. Biteau for his help in obtaining VHE data from published papers which is now available via OpenUniverse and SSDC-ASI Data Science portals. We make use of archival data and bibliographic information obtained from the NASA-IPAC Extragalactic Database (NED), data, and software facilities maintained by the Space Science Data Center (SSDC) from the Italian Space Agency. We thank the anonymous referee for all comments, which helped to improve the discussion and presentation of the paper This paper presents the results of a gamma-ray likelihood analysis over all the extreme and high synchrotron peak blazars (EHSP and HSP) from the 3HSP catalogue. We investigate 2013 multifrequency positions under the eyes of Fermi Large Area Telescope, co Abstract: This paper presents the results of a gamma-ray likelihood analysis over all the extreme and high synchrotron peak blazars (EHSP and HSP) from the 3HSP catalogue. We investigate 2013 multifrequency positions under the eyes of Fermi Large Area Telescope, considering 11 yr of observations in the energy range between 500MeV and 500 GeV, which results in 1160 gamma-ray signatures detected down to the TS = 9 threshold. The detections include 235 additional sources concerning the Fermi Large Area Telescope Fourth Source Catalog (4FGL), all confirmed via high-energy TS (Test Statistic) maps, and represent an improvement of similar to 25 per cent for the number of EHSP and HSP currently described in gamma-rays. We build the gamma-ray spectral energy distribution (SED) for all the 1160 2BIGB sources, plot the corresponding gamma-ray logN-logS, and measure their total contribution to the extragalactic gamma-ray background, which reaches up to similar to 33 per cent at 100 GeV. Also, we show that the gamma-ray detectability improves according to the synchrotron peak flux as represented by the figure of merit parameter, and note that the search for TeV peaked blazars may benefit from considering HSP and EHSP as a whole, instead of EHSPs only. The 2BIGB acronym stands for 'Second Brazil-ICRANet Gamma-ray Blazars' catalogue, and all the broad-band models and SED data points will be available on public data repositories (OpenUniverse, GitHub, and Brazilian Science Data Center-BSDC) FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP Aberto