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Title:
The Nature of Nearby Counterparts to Intermediate-Redshift Luminous Compact Blue Galaxies. I. Optical/H I Properties and Dynamical Masses
Authors:
Garland, C. A.; Pisano, D. J.; Williams, J. P.; Guzmán, R.; Castander, F. J.
Affiliation:
AA(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; ), AB(CSIRO Australia Telescope National Facility, P.O. Box 76, Epping, NSW 1710, Australia; ), AC(Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; ), AD(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, P.O. Box 112055, Gainesville, FL 32611-2055 ), AE(Institut d'Estudis Espacials de Catalunya/CSIC, Gran Capità 2-4, E-08034 Barcelona, Spain; )
Publication:
The Astrophysical Journal, Volume 615, Issue 2, pp. 689-701. (ApJ Homepage)
Publication Date:
11/2004
Origin:
UCP
ApJ Keywords:
Galaxies: Evolution, Galaxies: Fundamental Parameters, Galaxies: ISM, Galaxies: Kinematics and Dynamics, Galaxies: Starburst
DOI:
10.1086/424562
Bibliographic Code:
2004ApJ...615..689G

Abstract

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 MHI ranging from 5×108 to 8×109 Msolar and MHIL-1B ranging from 0.2 to 2 Msolar L-1solar, consistent with a variety of morphological types of galaxies. We find that the dynamical masses (measured within R25) span a wide range, from 1 to 1×1011 Msolar. 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.

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