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Fermi LAT Detection of a New Gamma-ray Source 4C +50.11

ATel #5838; B. Carpenter (Catholic U.), R. Ojha (NASA/GSFC/UMBC/CRESST), F. D'Ammando (INAF-IRA Bologna), M. Orienti (INAF-IRA Bologna), C. C. Cheung (NRL) on behalf of the Fermi Large Area Telescope Collaboration
on 31 Jan 2014; 15:31 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)

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

Referred to by ATel #: 5878

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed strong gamma-ray emission from a source positionally consistent with the extragalactic radio source 4C +50.11 (also known as NRAO 150) with coordinates RA=03h59m29.7472s, Dec=+50d57m50.161s (J2000; Beasley et al. 2002, ApJS, 141, 13). This source is classified as an FSRQ at a redshift of 1.52 (Agudo et al. 2007, A&A 476, L17).

Preliminary analysis indicates that on January 29, 2014, the daily averaged flux (E>100MeV) was (1.3+/-0.2) x 10^-6 photons cm^-2 s^-1 (errors are statistical only). This source is not in any published LAT catalog and was not detected by EGRET. The source had a photon index of (2.2+/-0.1) which is a typical value for LAT-detected FSRQs.

Because Fermi 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 further multifrequency observations of this source. The Fermi LAT contact person is Bryce Carpenter (carpbr01@gmail.com).

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.