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

Hunter, Deidre A.; Gallardo, Samavarti; Zhang, Hong-Xin; Adamo, Angela; Cook, David O.; Oh, Se-Heon; Elmegreen, Bruce G.; Kim, Hwihyun; Kahre, Lauren; Ubeda, Leonardo; Bright, Stacey N.; Ryon, Jenna E.; Fumagalli, Michele; Sacchi, Elena; Kennicutt, R.C.; Tosi, Monica; Dale, Daniel A.; Cignoni, Michele; Messa, Matteo; Grebel, Eva K.; Gouliermis, Dimitrios A.; Sabbi, Elena; Grasha, Kathryn; Gallagher, John S.; Calzetti, Daniela; Lee, Janice C.

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Authors

Deidre A. Hunter

Samavarti Gallardo

Hong-Xin Zhang

Angela Adamo

David O. Cook

Se-Heon Oh

Bruce G. Elmegreen

Hwihyun Kim

Lauren Kahre

Leonardo Ubeda

Stacey N. Bright

Jenna E. Ryon

Elena Sacchi

R.C. Kennicutt

Monica Tosi

Daniel A. Dale

Michele Cignoni

Matteo Messa

Eva K. Grebel

Dimitrios A. Gouliermis

Elena Sabbi

Kathryn Grasha

John S. Gallagher

Daniela Calzetti

Janice C. Lee



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.

Citation

Hunter, D. A., Gallardo, S., Zhang, H., Adamo, A., Cook, D. O., Oh, S., …Lee, J. C. (2018). A Study of Two Dwarf Irregular Galaxies with Asymmetrical Star Formation Distributions. Astrophysical Journal, 855(1), Article 7. https://doi.org/10.3847/1538-4357/aaa964

Journal Article Type Article
Acceptance Date Jan 17, 2018
Online Publication Date Feb 27, 2018
Publication Date Feb 27, 2018
Deposit Date Mar 15, 2018
Publicly Available Date Mar 16, 2018
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 855
Issue 1
Article Number 7
DOI https://doi.org/10.3847/1538-4357/aaa964

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Copyright Statement
© 2018. The American Astronomical Society. All rights reserved.





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