Ultraviolet Signatures of Tidal Interaction in the Giant Spiral Galaxy M101

  title={Ultraviolet Signatures of Tidal Interaction in the Giant Spiral Galaxy M101},
  author={William H. Waller and Ralph C. Bohlin and Robert H. Cornett and Michael Nicholas Fanelli and Wendy L. Freedman and Jesse K. Hill and Barry F. Madore and Susan Gale Neff and Joel D. Offenberg and Robert W. O’Connell and Morton S. Roberts and Andrew M. Smith and Theodore P. Stecher},
  journal={The Astrophysical Journal},
We present new evidence for the occurrence of tidal interactions in the disk of M101 during the last 108-109 yr. Recent imaging of the far-ultraviolet emission from M101 by the shuttle-borne Ultraviolet Imaging Telescope (UIT) reveals with unprecedented clarity a disk-wide pattern of multiple linear arm segments ("crooked arms"). The deep far-ultraviolet (FUV) image also shows a faint outer spiral arm with a ("curly tail") feature that appears to loop around the supergiant H II region NGC 5471… 

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