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Journal Article

A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions

MPS-Authors

Hunter,  Deidre A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gallardo,  Samavarti
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhang,  Hong-Xin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Adamo,  Angela
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cook,  David O.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Oh,  Se-Heon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Elmegreen,  Bruce G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  Hwihyun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kahre,  Lauren
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ubeda,  Leonardo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bright,  Stacey N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ryon,  Jenna E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fumagalli,  Michele
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sacchi,  Elena
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kennicutt,  R. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tosi,  Monica
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dale,  Daniel A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cignoni,  Michele
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Messa,  Matteo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Grebel,  Eva K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gouliermis,  Dimitrios A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sabbi,  Elena
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Grasha,  Kathryn
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gallagher III,  John S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Calzetti,  Daniela
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee,  Janice C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018ApJ...855....7H
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Citation

Hunter, D. A., Gallardo, S., Zhang, H.-X., Adamo, A., Cook, D. O., Oh, S.-H., et al. (2018). A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions. The Astrophysical Journal, 855.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CD32-C
Abstract
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.