Even one zoom-in and I find something interesting. What's that faint illuminated tendril extending from M61 (the large spiral galaxy at the bottom center of th

Even one zoom-in and I find something interesting. What's that faint illuminated tendril extending from M61 (the large spiral galaxy at the bottom center of the image) upwards towards that red giant? It seems too straight and off-center to be an extension of the spiral arm. EDIT: The supposed "Tidal tail" on M61 was evidently known from deep astrophotography, but only rarely detected & commented upon.