[ Previous | Next | ADS ]

Fermi LAT detection of a new gamma-ray source associated with PKS 0920-39

ATel #5326; Y. T.Tanaka (Hiroshima University) and S. Buson (INFN & University of Padova) on behalf of the Fermi Large Area Telescope Collaboration
on 26 Aug 2013; 12:34 UT
Credential Certification: Yasuyuki T. Tanaka (tanaka@astro.isas.jaxa.jp)

Subjects: >GeV, AGN

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed increasing flux from a new gamma-ray source which is not included in any Fermi-LAT catalog. Preliminary analysis indicated the source position of R.A.=140.55 deg (J2000), Dec.=-39.70 deg (J2000), with a 95% containment radius of 0.17 deg. The daily averaged gamma-ray flux was (1.0+/-0.2) 10^-6 photons cm^-2 s^-1 in the 100 MeV - 300 GeV energy range on August 23, 2013. All the flux and position errors are statistical only.

This source is positionally consistent with a quasar PKS 0920-39 located at R.A.= 140.6934 deg, Dec.= -39.9931 deg (J2000, Johnston et al. 1995, AJ, 110, 880), whose redshift is z=0.591 (Hewitt and Burbidge 1989, ApJS, 69, 1). We note that extended jet structure is detected from this quasar by Chandra observation (Massaro et al. 2011, ApJS, 197, 24).

Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. Multiwavelength observations of this source are strongly encouraged. The Fermi LAT contact person is Yasuyuki Tanaka (e-mail: ytanaka@hep01.hepl.hiroshima-u.ac.jp).

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.