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We report on INTEGRAL observations of AX J1838.0-0655, one of theunidentified objects listed in the first IBIS/ISGRI survey catalogue andlocated in the Scutum arm region. This object, detected in the 20-300 keV bandat a confidence level of 15.3 sigma (9 x 10^-11 erg cm-2 s-1) is the likelycounterpart of the still unidentified TeV source HESS J1837-069. It has beendetected in the past by various X-ray telescopes, including ASCA, implying thatit is a persistent rather than a transient source; the ASCA image is compatiblewith the source not being resolved. The broad 1-300 keV spectrum ischaracterized by an absorbed (NH = 6.7+/-1.3 x 10^22 cm-2) and hard (Gamma =1.5+/- 0.2) power law continuum. Possible counterparts (radio and infrared)present within the X-ray error box are discussed, even if no clear associationcan be identified. The broad band spectrum together with the TeV detectionsuggests that AX J1838.0-0655 maybe a supernova remnant or a pulsar windnebula, which has so far eluded detection in the radio band. This is the secondunidentified HESS source that shows a substantial soft gamma-ray emission.Comment: 12 pages, 3 figures; accepted for publication in ApJ Letter

The INTEGRAL /IBIS Source AX J1838.0-0655: A Soft X-Ray-to-TeV γ-Ray Broadband Emitter