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[Context] Recent detections of disks around young high-mass stars support theidea of massive star formation through accretion rather than coalescence, butthe detailed kinematics in the equatorial region of the disk candidates is notwell known, which limits our understanding of the accretion process. [Aims]This paper explores the kinematics of the gas around a young massive star withmillimeter-wave interferometry to improve our understanding of the formation ofmassive stars though accretion. [Methods] We use Plateau de Bureinterferometric images to probe the environment of the nearby (~1 kpc) andluminous (~20000 Lsun) high-mass (10-16 Msun) young star AFGL 2591-VLA3 incontinuum and in lines of HDO, H218O and SO2 in the 115 and 230 GHz bands.Radiative transfer calculations are employed to investigate the kinematics ofthe source. [Results] At ~0.5" (500 AU) resolution, the line images clearlyresolve the velocity field of the central compact source (diameter of ~ 800 AU)and show linear velocity gradients in the northeast-southwest direction.Judging from the disk-outflow geometry, the observed velocity gradient resultsfrom rotation and radial expansion in the equatorial region of VLA3. Radiativetransfer calculations suggest that the velocity field is consistent withsub-Keplerian rotation plus Hubble-law like expansion. The line profiles of theobserved molecules suggest a layered structure, with HDO emission arising fromthe disk mid-plane, H218O from the warm mid-layer, and SO2 from the upper disk.[Conclusions] We propose AFGL 2591-VLA3 as a new massive disk candidate, withpeculiar kinematics. The rotation of this disk is sub-Keplerian, probably dueto magnetic braking, while the stellar wind may be responsible for theexpansion of the disk. The expansion motion [...]

Kinematics of the inner thousand AU region around the young massive star AFGL 2591-VLA3: a massive disk candidate?