The star formation histories of red and blue low surface brightness disk galaxies

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Table 1:

Stellar populations of red and blue disk LSBGs.
SSP		blue LSBGs	red LSBGs
age(t, Gyr)	young $(t \leq 0.5)$	58.8	38.9
	intermediate $(0.64 \leq t \leq 2.5)$	35.3	27.8
	old $(t \geq 5.0)$	5.9	33.3
$Z/Z_{\odot}$	0.2	58.8	35.3
	1	29.4	47.1
	2.5	11.8	17.6

Notes. Results of fitting the combined spectra by using STARLIGHT with 45 SSPs from Bruzual & Charlot (2003). The contributed light fractions in three age-bins (young populations with age ${\leq} 5 \times 10^8$ yr, intermediate populations with $6.4 \times 10^8~{\rm yr} \leq {\rm age} \leq 2.5 \times 10^9$ yr and old populations with age ${\geq} 5.0 \times 10^9$ yr) and three metallicities (0.2, 1.0 and 2.5 $Z_\odot$ ) are presented. It is noticed that the percent fractions here are slightly different from the x_j component output by STARLIGHT directly.

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