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We report the results of three Chandra observations covering most of theextent of the TeV gamma-ray source HESS J1616-508 and a search for a lowerenergy counterpart to this source. We detect 56 X-ray sources, of which 37 havecounterparts at lower frequencies, including a young massive star cluster, butnone of them appears to be a particularly promising counterpart to the TeVsource. The brightest X-ray source, CXOU J161423.4-505738 with a flux of5x10^{-13} c.g.s. in the 0.5-7.0 keV band, has a hard spectrum that is well fitby a power-law model with a photon index of 0.2+/-0.3 and is a likelyintermediate polar CV candidate. No counterparts of this source were detectedat other wavelengths. CVs are not known to produce extended TeV emission, andthe source is also largely offset (19') from HESS J1616-508, making themunlikely to be associated. We have also set an upper limit on the X-ray flux ofPSR J1614-5048 in the 0.5-8 keV band (F<5x10^{-15} c.g.s. at a 90% confidencelevel). This makes PSR J1614-5048 one of the least X-ray efficient pulsarsknown, with an X-ray efficiency {\eta}=L_x/Edot < 2x10^{-5} in the 0.5-8 keVband. We find no evidence supporting the association between the pulsar and theTeV source. We rule out a number of X-ray sources as possible counterparts tothe TeV emission and do not find a plausible counterpart among the othersources. Lastly, we discuss the possible relation of PSR J1617-5055 to HESSJ1616-508 in light of the new observations.

Chandra Observations of the field containing HESS J1616-508