近邻恒星形成星系的主序关系  

Main sequence of the nearby star-forming galaxies

作　　者：李力[1] 郝彩娜[1] 郭蕊[1] LI Li;HAO Caina;GUO Rui(Astrophysics Center, Tianjin Normal University, Tianjin 300387, Chin)

机构地区：[1]天津师范大学天体物理中心,天津300387

出　　处：《天津师范大学学报（自然科学版）》2018年第3期14-20,共7页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11373027)

摘　　要：为了验证现有孔径改正方法的有效性,基于一个具有星系总体Hα、Hβ发射线流量和紫外(UV)、远红外(FIR)多波段数据的近邻(<150 Mpc)星系样本,研究不受孔径效应影响的Hα作为恒星形成率指示剂的恒星形成主序关系,并对Hα和远紫外(FUV)分别作为恒星形成率探针时的主序关系进行对比.结果表明:不受孔径效应影响的Hα作为恒星形成率指示剂的主序关系与已有的利用孔径改正所得主序关系一致,表明通常采用的孔径改正方法可以还原星系整体Hα流量.此外,利用总红外(TIR)与FUV之比以及FUV-NUV颜色对FUV流量进行尘埃消光改正所得FUV作为恒星形成率示踪物的主序关系一致,表明FUV-NUV颜色对FUV流量进行消光改正没有引入更大的误差.To test the availability of the commonly used methods of aperture correction,the star-forming main sequence（MS）relation using the total Hα luminosities free from aperture effects as a star formation rate（SFR）tracer was studied based on a nearby（150 Mpc）star-forming galaxy sample with total Hα,Hβ flux densities and ultra-violet（UV）,far-infrared（FIR）multi-wavelength data,and was compared with those MS relations based on SFR derived from FUV luminosities. The results show that the MS relation based on our total Hα luminosities without aperture correction is consistent with those based on Hα luminosities with aperture corrections,which suggests that the total Hα luminosities can be recovered well using the commonly used methods to correct for aperture effects. Furthmore,the MS relations based on dust-corrected FUV luminosities using total infrared（TIR） to FUV ratio is in agreement with that using FUV-NUV color for dust correction,which implies that extra errors would not be introduced into the MS relation when FUV-NUV color is used for dust correction.

关 键 词：近邻恒星形成星系 恒星形成率 孔径效应 

分 类 号：P157[天文地球—天文学]