paper

An H Imaging Survey of the Low-surface-brightness Galaxies Selected from the Fall Sky Region of the 40 ALFALFA \ion{H}{1} Survey

arXiv:1803.02650 · doi:10.3847/1538-4365/aaa7ec

Abstract

We present the observed H flux and derived star formation rates (SFRs) for a fall sample of lowsurfacebrightness galaxies (LSBGs). The sample is selected from the fall sky region of the 40 ALFALFA {\ion{H}{1}} survey SDSS DR7 photometric data, and all the images were obtained using the 2.16 m telescope, operated by the National Astronomy Observatories, Chinese Academy of Sciences. A total of 111 LSBGs were observed and flux was measured in 92 of them. Though almost all the LSBGs in our sample are {\ion{H}{1}}rich, their SFRs derived from the extinction and filtertransmissioncorrected flux, are less than 1$M_{\sun}$. LSBGs and star forming galaxies have similar {\ion{H}{1}} surface densities, but LSBGs have much lower SFRs and SFR surface densities than starforming galaxies. Our results show that LSBGs deviate from the Kennicutt-Schmidt law significantly, which indicate that they have low star formation efficiency. The SFRs of LSBGs are close to average SFRs in Hubble time and support the previous arguments that most of the LSBGs are stable systems and they tend to seldom contain strong interactions or major mergers during their star formation histories.

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