The Starburst-Interstellar Medium Interaction in NGC 1569. I. Location and Nature of He II Sources Using HUBBLE SPACE TELESCOPE WFPC2 Imagery
The Starburst-Interstellar Medium Interaction in NGC 1569. I. Location and Nature of He II Sources Using HUBBLE SPACE TELESCOPE WFPC2 Imagery
复制标题
NGC 1569 中的星暴-星际介质相互作用。 I. 使用哈勃太空望远镜 WFPC2 图像的 He II 源的位置和性质
DOI：
10.1086/316820
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
D. Walter
中科院分区：
文献类型：
--
作者：
B. Buckalew;R. Dufour;P. Shopbell;D. Walter
我们给出了从哈勃太空望远镜WFPC2图像中探测到的Im星系NGC1569中的He II源。在15次探测中，7次是Wolf-Rayet恒星，5次是伴随着He II发射的星团，3次是来源不明。探测到的沃尔夫-瑞耶星的颜色和星等与大麦哲伦星云晚型WN恒星的颜色和星等相似。讨论了其他He II源的物理来源。我们的结论是，在NGC1569中已经探测到相当于51±19颗WNL恒星，我们估计NGC1569中的Wolf-Rayet总数为78±51。这些数字与SMC、LMC、银河系和其他星暴星系中的Wolf-Rayet恒星群相对于它们的光度、动力学质量和电离气体质量进行了比较。在这项研究之前，NGC1569中的Wolf-Rayet恒星不是用地面图像探测到的，而是通过长缝光谱显示的。这是第一次确定沃尔夫-瑞叶恒星在这个附近的、经过充分研究的“后恒星暴增”星系中的确切位置。
We present the detection of He II sources in the Im galaxy NGC 1569 from Hubble Space Telescope WFPC2 imagery. Of the 15 detections, seven were Wolf-Rayet stars, five were stellar clusters with associated He II emission, and three were sources of unknown origin. The detected Wolf-Rayet stars' colors and magnitudes are similar to those of Large Magellanic Cloud late-type WN stars. The physical origins of the other He II sources are discussed. We conclude that the equivalent of 51 ± 19 WNL stars have been detected in NGC 1569, and we have estimated the total Wolf-Rayet population in NGC 1569 as 78 ± 51. These numbers are compared with the Wolf-Rayet stellar populations in the SMC, LMC, Milky Way, and other starburst galaxies relative to their luminosities, dynamical masses, and ionized gas masses. Previous to this study, Wolf-Rayet stars in NGC 1569 were not detected using ground-based imagery but were only indicated through long-slit spectroscopy. This is the first time the exact locations of the Wolf-Rayet stars in this nearby, well-studied, "poststarburst" galaxy have been determined.