Bibcode
                                    
                            Trujillo, I.; Martinez-Valpuesta, Inma; Martínez-Delgado, David; Peñarrubia, Jorge; Gabany, R. Jay; Pohlen, Michael
    Bibliographical reference
                                    The Astrophysical Journal, Volume 704, Issue 1, pp. 618-628 (2009).
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                        10
            
                        2009
            
  Journal
                                    
                            Citations
                                    24
                            Refereed citations
                                    22
                            Description
                                    We have conducted a deep multiwavelength analysis (0.15-160 μm) to
study the outer region of the nearby galaxy M94. We show that the
non-optical data support the idea that the outskirts of this galaxy are
not formed by a closed stellar ring (as traditionally claimed in the
literature) but by a spiral arm structure. In this sense, M94 is a good
example of a Type III (anti-truncated) disk galaxy having a very bright
outer disk. The outer disk of this galaxy contains ~23% of the total
stellar mass budget of the galaxy and contributes ~10% of the new stars
created showing that this region of the galaxy is active. In fact, the
specific star formation rate (SFR) of the outer disk (~0.012
Gyr-1) is a factor of ~2 larger (i.e., the star formation is
more efficient per unit stellar mass) than in the inner disk. We have
explored different scenarios to explain the enhanced star formation in
the outer disk. We find that the inner disk (if considered as an oval
distortion) can dynamically create a spiral arm structure in the outer
disk which triggers the observed relatively high SFR as well as an inner
ring similar to what is found in this galaxy.
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