Fermi-LAT detection of a new gamma-ray source associated with the FSRQ PMN J1032-1400

ATel #15642; Janeth Valverde (UMBC/NASA GSFC), Stefano Ciprini (INFN Roma Tor Vergata, & ASI Space Science Data Center, Roma, Italy), C. C. Cheung (Naval Research Laboratory), on behalf of the the Fermi Large Area Telescope Collaboration
on 2 Oct 2022; 15:39 UT
Credential Certification: Teddy Cheung (Teddy.Cheung@nrl.navy.mil)

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The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed gamma-ray emission from a source positionally consistent with the flat spectrum radio quasar PMN J1032-1400, also known as WGA J1032.1-1400 (Perlman et al. 1998, AJ, 115, 1253), with coordinates R.A. = 158.025944 deg, Decl. = -14.005408 deg (J2000; Petrov et al. 2007 AJ, 133, 1236), and redshift z=1.039 (Perlman et al. 1998, AJ, 115, 1253). This source is not in any published LAT catalog and was not detected by AGILE or EGRET.

Preliminary analysis indicates that this source was significantly detected (>5 sigma) in a high gamma-ray state on September 28, 2022 with a daily averaged gamma-ray flux (E>100MeV) of (1.2+/-0.3) X 10^-6 photons cm^-2 s^-1 and a single power-law photon index of 2.4+/-0.2 (statistical uncertainties only). The best fit gamma-ray position was located at R.A. = 158.04 deg, Decl. = -14.06 deg, with a 68% confidence radius of 0.19 deg and an angular separation of 0.06 deg from the proposed radio counterpart.

Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. This source is being added to the "LAT Monitored Sources" and consequently, a preliminary estimation of the daily gamma-ray flux observed by Fermi-LAT will be publicly available (http://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/ ). We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact persons are J. Valverde (valverde@llr.in2p3.fr) and S. Ciprini (stefano.ciprini[at]ssdc.asi.it).

The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.