University of Hertfordshire

Little Things

Research output: Contribution to journalArticle


  • 906747

    Submitted manuscript, 2.59 MB, PDF document

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


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


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