基于积分场光谱数据的近邻星系恒星形成区多波段恒星形成率定标研究

为探究多波段数据相结合的恒星形成率定标在近邻星系恒星形成区的可应用性,基于窄带Hα成像观测数据、二维积分场光谱数据(IFS)以及Spitzer/MIPS 24μm和Herschel/PACS 70、100、160μm的中远红外波段高空间分辨率图像,对5个近邻恒星形成星系中119个恒星形成区进行恒星形成率定标研究.以由IFS数据测得的巴尔末减缩得到的内部消光改正后的Hα光度为基准,将24、70、100和160μm与未经过内部消光改正的Hα光度相结合进行定标.结果发现:在1034~1039 erg/s光度范围内,4个红外波段与Hα光度的结合均能很好地示踪经过内部消光改正的Hα光度,RMS为0.20~0.27 dex.良好的数据分布表明基于较小样本的研究结果具有统计意义和可应用性.

Hybrid star formation rate calibration on star-forming region in nearby galaxies with integral field spectroscopy

Based on narrowband Hα imaging data, integral field spectroscopy data （IFS） and Spitzer/MIPS 24 μm mid- infrared, Herschel/PACS 70, 100 and 160 μm far-infrared high spatial resolution images, star formation rate calibrations for a sample of 119 star forming regions in 5 nearby star-forming galaxies were carried out. The internal attenuation- corrected Ha luminosities from the Balmer decrements that were measured by the IFS data, are used as the reference star formation rate tracer. The combinations of 24, 70, 100 and 160 μm luminosities with Hα luminosities were calibrated as SFR indicators. Results show that in the luminosity range of 10^34-10^39 erg·s^-1, these four composite star formation rate indicators can trace the internal attenuation corrected Ha luminosities closely, with RMS scatters of 0.2-0.27 dex.