Compact Core, Extended Reach: A Bipolar kpc-Scale Elongation in a Little Red Dot at z about 5.5

Little Red Dots (LRDs) appear extremely compact at rest-frame optical wavelengths, yet many show extended rest-frame UV morphology revealing more complex internal structure. We present a combined analysis of VLT/MUSE rest-frame UV integral-field spectroscopy and continuum-subtracted [O III], H β, and H α +[N II] emission-line maps from JWST/NIRCam imaging at sub-kpc resolution for LRD-204851 at z=5.482 in GOODS-S. We find that LRD-204851 hosts a remarkably thin, bipolar, elongated structure passing through the optical continuum centroid and extending several kpc on either side, traced by both the UV continuum and the rest-frame optical emission lines, with a bright [O III] clump-like structure about 2 kpc to the south-east of the centroid. The MUSE observations reveal a double-peaked Ly α profile, with a broad and bright near-systemic red peak and a relatively faint peak blueshifted by about 430 km s-1, accompanied by a tentative N V λ1238 detection at similar velocity. In narrow-band imaging extracted from the MUSE IFU cube, both the blue Ly α peak and the tentative N V emission lean toward this same south-eastern direction. Independently, radiative-transfer modeling of the integrated Ly α profile favors a biconical low-column-density cavity in a dense, slowly expanding neutral envelope, in support of the bipolar geometry traced by the line maps. Together, these results suggest that the elongated emission of LRD-204851 is connected to radiation and/or gas flow from its central engine through a low-column-density channel with a small opening angle that may trace either a slow outflow or a quasi-static ionization cone. LRD-204851 is one of the first LRDs where the central engine's impact on its host galaxy is potentially directly observable on kpc scales.