Discovery of a GeV Blazar Shining Through the Galactic Plane

Discovery of a GeV Blazar Shining Through the Galactic Plane,10.1088/2041-8205/718/2/L166,Astrophysical Journal Letters,J. Vandenbroucke,R. Buehler,M.

Discovery of a GeV Blazar Shining Through the Galactic Plane   (Citations: 1)
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J. Vandenbroucke, R. Buehler, M. Ajello, K. Bechtol, A. Bellini, M. Bolte, C. C. Cheung, F. Civano, D. Donato, L. Fuhrmann, S. Funk, S. E. Healey
The Fermi Large Area Telescope (LAT) discovered a new gamma-ray source near the Galactic plane, Fermi J0109+6134, when it flared brightly in 2010 February. The low Galactic latitude (b = -1fdg2) indicated that the source could be located within the Galaxy, which motivated rapid multi-wavelength follow-up including radio, optical, and X-ray observations. We report the results of analyzing all 19 months of LAT data for the source, and of X-ray observations with both Swift and the Chandra X-ray Observatory. We determined the source redshift, z = 0.783, using a Keck Low-Resolution Imaging Spectrometer observation. Finally, we compiled a broadband spectral energy distribution (SED) from both historical and new observations contemporaneous with the 2010 February flare. The redshift, SED, optical line width, X-ray absorption, and multi-band variability indicate that this new GeV source is a blazar seen through the Galactic plane. Because several of the optical emission lines have equivalent width >5 Å, this blazar belongs in the flat-spectrum radio quasar category.
Journal: Astrophysical Journal Letters - ASTROPHYS J LETT , vol. 718, no. 2, pp. L166-L170, 2010
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