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A study of two dwarf irregular galaxies with asymmetrical star formation distributions.

Hunter, Deidre A. and Gallardo, Samavarti and Zhang, Hong-Xin and Adamo, Angela and Cook, David O. and Oh, Se-Heon and Elmegreen, Bruce G. and Kim, Hwihyun and Kahre, Lauren and Ubeda, Leonardo and Bright, Stacey N. and Ryon, Jenna E. and Fumagalli, Michele and Sacchi, Elena and Kennicutt, R. C. and Tosi, Monica and Dale, Daniel A. and Cignoni, Michele and Messa, Matteo and Grebel, Eva K. and Gouliermis, Dimitrios A. and Sabbi, Elena and Grasha, Kathryn and Gallagher, John S. and Calzetti, Daniela and Lee, Janice C. (2018) 'A study of two dwarf irregular galaxies with asymmetrical star formation distributions.', Astrophysical journal., 855 (1). p. 7.


Two dwarf irregular galaxies, DDO 187 and NGC 3738, exhibit a striking pattern of star formation: intense star formation is taking place in a large region occupying roughly half of the inner part of the optical galaxy. We use data on the H i distribution and kinematics and stellar images and colors to examine the properties of the environment in the high star formation rate (HSF) halves of the galaxies in comparison with the low star formation rate halves. We find that the pressure and gas density are higher on the HSF sides by 30%–70%. In addition we find in both galaxies that the H i velocity fields exhibit significant deviations from ordered rotation and there are large regions of high-velocity dispersion and multiple velocity components in the gas beyond the inner regions of the galaxies. The conditions in the HSF regions are likely the result of large-scale external processes affecting the internal environment of the galaxies and enabling the current star formation there.

Item Type:Article
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Publisher statement:© 2018. The American Astronomical Society. All rights reserved.
Date accepted:17 January 2018
Date deposited:16 March 2018
Date of first online publication:27 February 2018
Date first made open access:16 March 2018

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