Media type: E-Article Title: UNCOVERING THE ORIGINS OF SPIRAL STRUCTURE BY MEASURING RADIAL VARIATION IN PATTERN SPEEDS Contributor: Meidt, Sharon E.; Rand, Richard J.; Merrifield, Michael R. Published: American Astronomical Society, 2009 Published in: The Astrophysical Journal, 702 (2009) 1, Seite 277-290 Language: Without Specification DOI: 10.1088/0004-637x/702/1/277 ISSN: 0004-637X; 1538-4357 Origination: Footnote: Access State: Open Access