S. Wolfe, D. Pisano, F. Lockman, S. McGaugh, and E. Shaya. (2013)cite arxiv:1305.1631Comment: 7 pages, 4 figures, including supplementary information and figure, to appear in Nature.
N. Goldbaum, M. Krumholz, C. Matzner, and C. McKee. (2011)cite arxiv:1105.6097
Comment: 23 Pages, 9 Figures. Resubmitted to ApJ with referee comments.
Comments are welcome.