Search of MeV–GeV counterparts of TeV sources with AGILE in pointing mode^⋆

¹ INFN–Pavia, via Bassi 6, 27100 Pavia, Italy
e-mail: andrea.rappoldi@pv.infn.it
² ASI Science Data Center, via del Politecnico snc, 00133 Roma, Italy
³ INAF–Osservatorio Astronomico di Roma, via di Frascati 33, 00040 Monteporzio Catone, Roma, Italy
⁴ INAF–Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, 34143 Trieste, Italy
⁵ INFN–Trieste, Padriciano 99, 34012 Trieste, Italy
⁶ INAF-IAPS Roma, via Fosso del Cavaliere 100, 00133 Roma, Italy
⁷ Dip. di Fisica, Università “Tor Vergata”, via della Ricerca Scientifica 1, 00133 Roma, Italy
⁸ INAF–IASF Bologna, via Gobetti 101, 40129 Bologna, Italy
⁹ School of Physics, University of the Witwatersrand, Johannesburg Wits 2050, South Africa
¹⁰ INAF–IASF Milano, via E. Bassini 15, 20133 Milano, Italy
¹¹ INFN–Roma Tor Vergata, via della Ricerca Scientifica 1, 00133 Roma, Italy
¹² INAF–IASF Palermo, via Ugo La Malfa 153, 90146 Palermo, Italy

Received: 9 June 2015
Accepted: 2 December 2015

Abstract

Context. Known TeV sources detected by major Čerenkov telescopes are investigated to identify possible MeV-GeV γ-ray counterparts.

Aims. A systematic study of the known sources in the web-based TeVCat catalog has been performed to search for possible γ-ray counterparts on the AGILE data collected during the first period of operations in observing pointing mode.

Methods. For each TeV source, a search for a possible γ-ray counterpart that is based on a multi-source maximum likelihood algorithm is performed on the AGILE data taken with the GRID instrument from July 2007 to October 2009.

Results. In the case of high-significance detection, the average γ-ray flux is estimated. For cases of low-significance detection the 95% confidence level (CL) flux upper limit is given. 52 TeV sources out of 152 (corresponding to ~34% of the analysed sample) show a significant excess in the AGILE data covering the pointing observation period.

Conclusions. This analysis found 26 new AGILE sources with respect to the AGILE reference catalogs, 15 of which are galactic, 7 are extragalactic and 4 are unidentified. Detailed tables with all available information on the analysed sources are presented.