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

A. Malizia | Zendy; L. Bassani | Zendy; J. B. Stephen | Zendy; A. Bazzano | Zendy; P. Ubertini | Zendy; A. J. Bird | Zendy; A. J. Dean | Zendy; V. Sguera | Zendy; M. Renaud | Zendy; R. Walter | Zendy; F. Gianotti | Zendy

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

Author(s) -

A. Malizia,

L. Bassani,

J. B. Stephen,

A. Bazzano,

P. Ubertini,

A. J. Bird,

A. J. Dean,

V. Sguera,

M. Renaud,

R. Walter,

F. Gianotti

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/491653

Subject(s) - physics , ibis , astrophysics , pulsar , broadband , supernova remnant , pulsar wind nebula , astronomy , supernova , optics , paleontology , biology

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

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