Fermi Detection of a Luminous γ-Ray Pulsar in a Globular Cluster

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Science  25 Nov 2011:
Vol. 334, Issue 6059, pp. 1107-1110
DOI: 10.1126/science.1207141

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  1. Fig. 1

    Phase-aligned radio and γ-ray profiles for J1823–3021A. (Bottom) Nançay 1.4 GHz radio profile. (Top and middle) γ-ray profiles obtained with the Fermi LAT in different energy bands. The dark histogram is for events with E > 3.0GeV. The γ-ray background for the 0.1 GeV light curve was estimated from a surrounding ring, and it is indicated by the dashed horizontal line in the top panel. The highlighted area there shows the on-pulse region selection.

  2. Fig. 2

    Fermi LAT γ-ray count map above 100 MeV for J1823–3021A during the on-pulse (Left) and off-pulse (Right) regions, as defined in Fig. 1. The 6° by 6° region is centered on the pulsar position (cross). The map was adaptively smoothed by imposing minimum signal-to-noise ratios of 13 and 16 for the on- and off-pulse regions, respectively. The large circle indicates the tidal radius of NGC 6624. The small circle shows the 99% confidence region for the location of the γ-ray source.