Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-19
Astron.Astrophys.411:L427-L432,2003
Astronomy and Astrophysics
Astrophysics
6 pages, 4 figures (fig 1 quality lowered), accepted for publication in A&A letters (INTEGRAL special issue)
Scientific paper
10.1051/0004-6361:20031369
INTEGRAL regularly scans the Galactic plane to search for new objects and in particular for absorbed sources with the bulk of their emission above 10-20 keV. The first new INTEGRAL source was discovered on 2003 January 29, 0.5 degree from the Galactic plane and was further observed in the X-rays with XMM-Newton. This source, IGR J16318-4848, is intrinsically strongly absorbed by cold matter and displays exceptionally strong fluorescence emission lines. The likely infrared/optical counterpart indicates that IGR J16318-4848 is probably a High Mass X-Ray Binary neutron star or black hole enshrouded in a Compton thick environment. Strongly absorbed sources, not detected in previous surveys, could contribute significantly to the Galactic hard X-ray background between 10 and 200 keV.
Corbel Sephane
Courvoisier Thierry J. -L.
de Plaa Jelle
den Hartog Peter R.
Foschini Luca
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