EDP Sciences
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Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
Page(s) L427 - L432
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20031369

A&A 411, L427-L432 (2003)
DOI: 10.1051/0004-6361:20031369


INTEGRAL discovery of a bright highly obscured galactic X-ray binary source IGR J16318-4848

R. Walter1, 2, J. Rodriguez3, 1, L. Foschini4, J. de Plaa5, S. Corbel3, 6, T. J.-L. Courvoisier1, 2, P. R. den Hartog5, F. Lebrun3, A. N. Parmar7, J. A. Tomsick8 and P. Ubertini9

1  INTEGRAL Science Data Centre, Chemin d'Écogia 16, 1290 Versoix, Switzerland
2  Observatoire de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
3  CEA Saclay, DSM/DAPNIA/SAp (CNRS FRE 2591), Bât. 709, 91191 Gif-sur-Yvette Cedex, France
4  IASF/CNR Section of Bologna, via Pietro Gobetti 101, 40129 Bologna, Italy
5  SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
6  Université Paris VII (Fédération APC), 91191 Gif-sur-Yvette, France
7  Astrophysics Missions Division, Research and Scientific Support Department of ESA, ESTEC, PO Box 299, 2200 AG Noordwijk, The Netherlands
8  CASS, Code 0424, University of California San Diego, La Jolla, CA 92093-0424, USA
9  IASF/C.N.R. Section of Roma, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, 00133 Roma, Italy

(Received 14 July 2003 / Accepted 4 September 2003 )

INTEGRAL regularly scans the Galactic plane to search for new objects and in particular for absorbed sources with the bulk of their emission above $10{-}20~{\rm keV}$. The first new INTEGRAL source was discovered on 2003 January 29, 0.5 $\degr$ 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 $200~{\rm keV}$.

Key words: X-rays: individuals: IGR J16318-4848 -- X-rays: binaries -- X-rays: diffuse background

Offprint request: R. Walter, Roland.Walter@obs.unige.ch

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