2004/07/20 by C. A. Garland, D. J. Pisano, J. P. Williams +2 · 5 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/424562
published as Astrophys.J. 615 (2004) 689-701 · 33 pages, 8 figures, accepted by ApJ
arxiv created 2004/07/20 · openalex publication_date 2004/11/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We present single-dish H I spectra obtained with the Green Bank Telescope, along with optical photometric properties from the Sloan Digital Sky Survey, of 20 nearby ( D ≲ 70 Mpc) luminous compact blue galaxies (LCBGs). These ~ L *, blue, high surface brightness, starbursting galaxies were selected using the same criteria as were used to define LCBGs at higher redshifts. We find that these galaxies are gas-rich, with M H i ranging from 5 × 10 8 to 8 × 10 9 M ☉ and M H i L ranging from 0.2 to 2 M ☉ L , consistent with a variety of morphological types of galaxies. We find that the dynamical masses (measured within R 25 ) span a wide range, from 1 to 1 × 10 11 M ☉ . However, at least half have dynamical mass-to-light ratios smaller than those of nearby galaxies of all Hubble types, as found for LCBGs at intermediate redshifts. By comparing line widths and effective radii with local galaxy populations, we find that LCBGs are consistent with the dynamical mass properties of Magellanic (low luminosity) spiral galaxies and the more massive irregular and dwarf elliptical galaxies, such as NGC 205.