ALFALFA DISCOVERY OF THE NEARBY GAS-RICH DWARF GALAXY LEO P. II. OPTICAL IMAGING OBSERVATIONS

作者：Rhode Katherine L^*; Salzer John J; Haurberg Nathalie C; Van Sistine Angela; Young Michael D; Haynes Martha P; Giovanelli Riccardo; Cannon John M; Skillman Evan D; McQuinn Kristen B W; Adams Elizabeth A K

来源：Astronomical Journal, 2013, 145(6): 149.

DOI：10.1088/0004-6256/145/6/149

• galaxies: distances and redshifts
• galaxies: dwarf
• galaxies: irregular
• galaxies: photometry
• galaxies: stellar content

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-o similar to 25. We also use narrowband H alpha imaging from the KPNO 2.1 m telescope to identify a H II 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.

• 出版日期2013-6