Astronomy & Astrophysics manuscript no. ms December 4, 2018 (DOI: will be inserted by hand later) Optical BVI Imaging and H i Synthesis Observations of the Dwarf Irregular Galaxy ESO 364-G029 M. B. N. Kouwenhoven1,2,3, M. Bureau4, S. Kim5, and P. T. de Zeeuw2 1 Department of Physics and Astrophysics, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom (t.kouwenhoven@sheffield.ac.uk) 2 Sterrewacht Leiden, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, Netherlands (
[email protected]) 3 Astronomical Institute Anton Pannekoek, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands 4 Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom (
[email protected]) 5 Astronomy & Space Science Department, Sejong University, 98 Kwangjin-gu, Kunja-dong, Seoul, 143-747, Korea (
[email protected]) Received / Accepted Abstract. As part of an effort to enlarge the number of well-studied Magellanic-type galaxies, we obtained broadband op- tical imaging and neutral hydrogen radio synthesis observations of the dwarf irregular galaxy ESO 364-G029. The optical morphology characteristically shows a bar-like main body with a one-sided spiral arm, an approximately exponential light distribution, and offset photometric and kinematic centers. The H i distribution is mildly asymmetric and, although slightly offset from the photometric center, roughly follows the optical brightness distribution, extending to over 1.2 Holmberg radii −2 (where µB = 26.5 mag arcsec ). In particular, the highest H i column densities closely follow the bar, one-arm spiral, and a third optical extension. The rotation is solid-body in the inner parts but flattens outside of the optical extent.