Molecular Gas and Star-Formation In Low Surface Brightness Galaxies

Abstract

We have obtained CO(J=2-1) spectra of nine face-on low surface brightness galaxies(LSBGs) using the JCMT 15-meter telescope and observed Ha images using the 2.16-meter telescope of NAOC. As no CO has been detected, only upper limits on the H2 masses are given. The upper limits of total molecular hydrogen masses are about (1.2-82.4) x 10^7 Msun. Their star formation rates are mainly lower than 0.4 Msun/yr and star formation efficiencies are lower than 1.364 x 10^10 /yr. Our results show that the absence of molecular gas content is the direct reason for the low star formation rate. The low star formation efficiency probably resulted from the low efficiency of HI gas transforming to H2 gas.

27 pages, 7 figures, 3 tables, Accepted for publication in AJ

References in corpus (5)

• GALEX observations of Low Surface Brightness Galaxies: UV color and star formation efficiency
• GHASP : An Halpha kinematic survey of 203 spiral and irregular galaxies - VII. Revisiting the analysis of Halpha data cubes for 97 galaxies
• The AGN and Gas Disk in the Low Surface Brightness Galaxy PGC045080
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• An $\mathrm{H}\alpha$ Imaging Survey of the Low Surface Brightness Galaxies Selected from the Spring Sky Region of the 40% ALFALFA HI Survey
• CO observations toward HI-rich Ultra Diffuse Galaxies
• Understanding the chemical evolution of blue Edge-on Low Surface Brightness Galaxies
• Formation of A Nuclear Star Cluster Through A Merger Event In The Low Surface Brightness Galaxy AGC 223218