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Hubble Space Telescope Identification of the Optical Counterparts of Ultraluminous X‐Ray Sources in M51
Terashima, Inoue, & Wilson 2006 The Astrophysical Journal 645 264.
Caption: Fig. 2.
ACS F658N (Hα) images around ULX‐1. Image size is the same as Fig. 1. North is up and east is to the left.
© 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.