[ Previous | Next | ADS ]

Fermi-LAT Detection of Gamma-ray Emission from the FSRQ PKS 0035-252

ATel #10951; Janeth Valverde (LLR/Ecole Polytechnique) and Roopesh Ojha (NASA/GSFC/UMBC) on behalf of the Fermi Large Area Telescope Collaboration
on 11 Nov 2017; 14:12 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)

Subjects: Gamma Ray, >GeV, AGN, Blazar, Quasar

The Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope, has observed a gamma-ray flare from a source positionally consistent with the flat spectrum radio quasar PKS 0035-252 with coordinates RA: 00h38m14.7355s, Dec: -24d59m02.234s, J2000, (Fey et al. 2015, AJ, 150, 58) and redshift z=0.498058 (Jones et al. 2009, MNRAS, 399, 683).

Preliminary analysis indicates that on 9 November 2017, this source was in a high-flux state, with a daily averaged gamma-ray flux (E>100MeV) of (0.4+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only) which is a factor of about 30 greater than the average flux reported in the third Fermi LAT catalog (3FGL; Acero et al. 2015, ApJS, 218, 23). The corresponding photon spectral index of 1.9+/-0.3 is harder than the typical range for a Fermi blazar.

Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. We encourage further multifrequency observations of this source. For this source the Fermi LAT contact person is Janeth Valverde (valverde@llr.in2p3.fr).

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.