Little Things

D. A. Hunter, D. Ficut-Vicas, T. Ashley, E. Brinks, P. Cigan, B. G. Elmegreen, V. Heesen, K. A. Herrmann, M. Johnson, S.H. Oh, M. P. Rupen, A. Schruba, C.E. Simpson, F. Walter, D. J. Westpfahl, L. M. Young, H.-X. Zhang

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185 Citations (Scopus)
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We present LITTLE THINGS (Local Irregulars That Trace Luminosity Extremes, The H I Nearby Galaxy Survey), which is aimed at determining what drives star formation in dwarf galaxies. This is a multi-wavelength survey of 37 dwarf irregular and 4 blue compact dwarf galaxies that is centered around H I-line data obtained with the National Radio Astronomy Observatory (NRAO) Very Large Array (VLA). The H I-line data are characterized by high sensitivity (≤1.1 mJy beam–1 per channel), high spectral resolution (≤2.6 km s–1), and high angular resolution (~6''). The LITTLE THINGS sample contains dwarf galaxies that are relatively nearby (≤10.3 Mpc; 6'' is ≤300 pc), that were known to contain atomic hydrogen, the fuel for star formation, and that cover a large range in dwarf galactic properties. We describe our VLA data acquisition, calibration, and mapping procedures, as well as H I map characteristics, and show channel maps, moment maps, velocity-flux profiles, and surface gas density profiles. In addition to the H I data we have GALEX UV and ground-based UBV and Hα images for most of the galaxies, and JHK images for some. Spitzer mid-IR images are available for many of the galaxies as well. These data sets are available online

Original languageEnglish
Article number134
Number of pages29
JournalThe Astronomical Journal
Issue number5
Publication statusPublished - Nov 2012


  • galaxies: irregular, galaxies: ISM, galaxies: kinematics and dynamics, galaxies: star formation, galaxies: structure


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