Picture of the Month 

June 2004

INTEGRAL observations of EGRET sources in the Norma region

These two images show a deep exposure (~700 ks obtained from Galactic Center Deep Exposure observations) of the Norma spiral arm tangent region. The images show the IBIS/ISGRI image in the 20-100 keV range (top) with EGRET contours superimposed and the 100-250 keV image (bottom). In the case of 3EG J1639-4702 the possible dust-enshrouded source IGR J16313-4643 has been proposed as a counterpart (Malizia et al. 2004, Atel 227; Combi et al. 2004, astro-ph/0401643). However, the high energy image shows that only GX 337+00 (a black hole candidate) emits above 100 keV. GX 337+00 shows many chararacteristics of galactic microquasars (radio jets, QPO, and X-ray behaviour).

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