Fermi-LAT detection of a new gamma-ray source associated with the FSRQ TXS 1029-137
ATel #15571; Sara Cutini (INFN Perugia) on behalf of the Fermi-LAT Collaboration
on 24 Aug 2022; 14:55 UT
Credential Certification: Stefano Ciprini (stefano.ciprini@ssdc.asi.it)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar, Quasar
Referred to by ATel #: 15572
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 TXS 1029-137, also known as BZQ J1032-1400 (Massaro et al. 2009, A&A, 495, 691), with coordinates R.A. = 158.0259 deg, Decl. = +14.0054 deg (J2000; Kovalev et al, 2007, AJ, 133, 123), and redshift z=1.039 (Caccianiga et al. 2000, A&A, 144, 247). 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 August 22, 2022 with a daily averaged gamma-ray flux (E>100MeV) of (1.0+/-0.2) 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. = 158.09 deg, Decl. = +-14.09 deg, with a 68% confidence radius of 0.11 deg and an angular separation of 0.1 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. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Sara Cutini (sara.cutini[at]pg.infn.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.
