SIMBAD references

We present new Kitt Peak National Observatory 0.9 m optical and Very Large Array H I spectral line observations of the Orion dwarf galaxy. This nearby (D ≃ 5.4 Mpc), intermediate-mass (M_dyn≃ 1.1x10¹⁰ M_☉) dwarf displays a wealth of structure in its neutral interstellar medium, including three prominent "hole/depression" features in the inner H I disk. We explore the rich gas kinematics, where solid-body rotation dominates and the rotation curve is flat out to the observed edge of the H I disk (∼6.8 kpc). The Orion dwarf contains a substantial fraction of dark matter throughout its disk: comparing the 4.7x10⁸ M_☉ of detected neutral gas with estimates of the stellar mass from optical and near-infrared imaging (3.7x10⁸ M_☉) implies a mass-to-light ratio ≃13. New Hα observations show only modest-strength current star formation (SF; ∼0.04 M_☉/yr); this SF rate is consistent with our 1.4 GHz radio continuum non-detection.