We present flux-calibrated spectra in the range 3500 to 8000 ? for the nuclear regions of 250 galaxies and H I 21 cm line profiles for 238 galaxies selected from the catalog of low surface brightness galaxies identified in Automated Plate Measuring Facility (APM) scans of UK Schmidt Telescope survey plates. For the optical spectra, common nebular absorption- and emission-line equivalent widths and emission-line fluxes were measured with typical errors of about 20%. H I mass and velocity widths were measured from the 21 cm line emission, with 15% accuracy. Galaxies in this study span over 6 mag in surface brightness. Only about 20% of these galaxies show spectroscopic evidence of active galactic nuclei. Derived quantities such as synthetic colors, metallicity, star formation rate, the ratio of neutral hydrogen mass to blue light, and gas mass fraction are presented in a companion paper.
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机译：我们提出的通量校准光谱在3500至8000？ 250个星系的核区域和238个星系的H I 21 cm线剖面，这些数据选自英国施密特望远镜测量板的自动板测量设施（APM）扫描确定的低表面亮度星系目录。对于光谱，测量了常见的吸收和发射线等效宽度和发射线通量，典型误差约为20％。从21 cm的线发射测量H I质量和速度宽度，精度为15％。在这项研究中，星系的表面亮度跨越了6 mag。这些星系中只有约20％显示出活跃的银河核的光谱证据。随附的论文中提供了诸如合成色，金属性，恒星形成率，中性氢质量与蓝光之比以及气体质量分数之类的数量。
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