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We report on the first sub-arcsecond (0.44 $\times$ 0.41 arcsec$\rm ^2$)angular resolution image at 150 MHz of the A-nucleus in the Luminous InfraredGalaxy Arp$\,$299, from International Low Frequency Array (LOFAR) Telescopeobservations. The most remarkable finding is that of an intriguing two-sided,filamentary structure emanating from A-nucleus, which we interpret as anoutflow that extends up to at least 14 arcseconds from the A-nucleus in the N-Sdirection ($\approx$ 5 kpc deprojected size) and accounts for almost 40% of theextended emission of the entire galaxy system. We also discuss HST/NICMOS[FeII] 1.64 $\rm \mu m$ and H$\rm_2$ 2.12 $\rm \mu m$ images of Arp$\,$299-A,which show similar features to those unveiled by our 150 MHz LOFARobservations, thus giving string morphological support for the outflowscenario. Finally, we discuss unpublished NaI D spectra that confirm theoutflow nature of this structure. From energetic arguments, we rule out thelow-luminosity active galactic nucleus in Arp$\,$299-A as a driver for theoutflow. On the contrary, the powerful, compact starburst in the centralregions of Arp$\,$299-A provides plenty of mechanical energy to sustain anoutflow, and we conclude that the intense supernova (SN) activity in thenuclear region of Arp299-A is driving the observed outflow. We estimate thatthe starburst wind can support a mass-outflow rate in the range (11-63) $\rmM_{\odot} yr^{-1}$ at speeds of up to (370 - 890) $\rm km \, s^{-1}$, and isrelatively young, with an estimated kinematic age of (3 - 7) Myr. Those resultsopen an avenue to the use of low-frequency (150 MHz), sub-arcsecond imagingwith LOFAR to detect outflows in the central regions of local luminous infraredgalaxies.

Sub-arcsecond imaging of Arp\,299-A at 150 MHz with LOFAR: Evidence for a starburst-driven outflow