Geometric configuration around GL 2591

We present observations of K band (λ = 2.2 μm) polarization and CS J = 2 - 1 and 1 - 0 emission around GL2591. The polarization map reveals an infrared reflection nebula extended (2' x 1') to both east and west. The maps of CS lines delineate a dense disk (50'' x 80''). The infrared reflection nebula and the bipolar CO flow are parallel to each other, and perpendicular to the CS disk. The density and the mass of the disk are derived to be 1 x 105 cm-3 and 1000(Solar mass), respectively. The velocity gradient in the CS emission is nearly perpendicular to the major axis of the disk; this can be interpreted either as rotation about an axis tilted from the disk axis, or as contraction of the disk toward the central source. (author)