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The nature of the gamma-ray source HESS J1507-622 that is locatedsignificantly off-set from the Galactic plane is not ascertained to date.Identifying the environment of an enigmatic object may help to constrain itsnature. The path of the line of sight of HESS J1507-622 through the Galaxy iscompared to the characteristic length scales of stellar populations ofdifferent ages. Furthermore, for this object, the energy density in particlesis contrasted to the magnetic field energy density and constraints on thedistance based on equipartition between these two components are calculated.The line of sight of HESS J1507-622 reaches a minimum distance to the Galacticcenter at around a galactocentric distance of 5.3 kpc at about 300 pc off theGalactic disc. This location coincides with the scale length and width of starswith an age of 1.2 Gyr which could in principle be an indication that HESSJ1507-622 is connected to a stellar population of similar age. For such a casethe source appears to be strongly particle dominated. In a leptonic scenario,if a magnetic field in the source of 1 $\mu$G is assumed, equipartition betweenmagnetic field and particles would be realized at a distance of >1 Mpc. Thiscould indicate an extragalactic origin of this object. However, anextragalactic origin is challenged by the extension of the source. Theenvironment of HESS J1507-622 still remains elusive. For the case where thissource belongs to a new class of gamma-ray emitters, the distribution ofrelated objects (if existing) may help to settle the respective environment anddistance scale.

The environment of the unidentified gamma-ray source HESS J1507-622