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ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. II. Optical Imaging Observations

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arxiv 1305.0270 v1 pith:EFXNFYRO submitted 2013-05-01 astro-ph.GA astro-ph.CO

ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. II. Optical Imaging Observations

Katherine L. Rhode , John J. Salzer , Nathalie C. Haurberg , Angela Van Sistine , Michael D. Young , Martha P. Haynes , Riccardo Giovanelli , John M. Cannon
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Evan D. Skillman Kristen B. W. McQuinn Elizabeth A. K. Adams
This is my paper
classification astro-ph.GA astro-ph.CO
keywords galaxyimagingalfalfadatadwarfkpnolocaloptical
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We present results from ground-based optical imaging of a low-mass dwarf galaxy discovered by the ALFALFA 21-cm HI survey. Broadband (BVR) data obtained with the WIYN 3.5-m telescope at Kitt Peak National Observatory (KPNO) are used to construct color-magnitude diagrams of the galaxy's stellar population down to V_0 ~ 25. We also use narrowband H-alpha imaging from the KPNO 2.1-m telescope to identify an HII region in the galaxy. We use these data to constrain the distance to the galaxy to be between 1.5 and 2.0 Mpc. This places Leo P within the Local Volume but beyond the Local Group. Its properties are extreme: it is the lowest-mass system known that contains significant amounts of gas and is currently forming stars.

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