Two views of the Andromeda Galaxy H-alpha and far infrared
Two views of the Andromeda Galaxy H-alpha and far infrared
复制标题
仙女座星系 H-alpha 和远红外线的两个视图
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
N. Duric
中科院分区：
文献类型：
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作者：
N. Devereux;R. Price;L. Wells;N. Duric
仙女座星系（M31）的一个完整的H-α图像，允许第一次直接测量的总H-α光度是（7.3 +/- 2.4）x 10（exp 6）太阳光度。H-α辐射与三个形态上不同的组成部分有关：一个大规模的恒星形成环，直径约1.65度，贡献了总H-α辐射的66%，一个明亮的核心贡献了总H-α辐射的6%，剩下的28%是由以前未识别的星星形成环内部的扩展和间接H-α辐射组成的。当H-alpha图像和红外天文卫星远红外高分辨率图像被卷积到105角秒的共同分辨率时，两者之间的对应关系是惊人的。远红外和H-α图像之间的密切对应表明这两种发射的共同来源。恒星形成环贡献了M31远红外光度的70%。环发射是由高质量恒星激发的证据包括这样一个事实，即远红外发射的峰值与H-α图像中的H II区域一致。此外，恒星形成环内的远红外与H-α光度比与人们对由光谱类型在O 9和B 0之间的恒星提供动力的H II区域的预期相似。恒星形成环内部的H-α和远红外光度的起源不太清楚，但几乎可以肯定不是由高质量恒星产生的。
A complete H-alpha image of the Andromeda Galaxy (M31) is presented allowing the first direct measurement of the total H-alpha luminosity which is (7.3 +/- 2.4) x 10(exp 6) solar luminosity. The H-alpha emission is associated with three morphologically distinct components; a large scale star-forming ring, approximately 1.65 deg in diameter, contributing 66% of the total H-alpha emission, a bright nucleus contributing 6% of the total H-alpha emission with the remaining 28% contributed by a previously unidentified component of extended and filamentary H-alpha emission interior to the star forming ring. The correspondence between the H-alpha image and the Infrared Astronomy Satellite (IRAS) far-infrared high resolution image is striking when both are convolved to a common resolution of 105 arcsec. The close correspondence between the far-infrared and H-alpha images suggests a common origin for the two emissions. The star-forming ring contributes 70% of the far-infrared luminosity of M31. Evidence that the ring emission is energized by high mass stars includes the fact that peaks in the far-infrared emission coincide identically with H II regions in the H-alpha image. In addition, the far-infrared to H-alpha luminosity ratio within the star-forming ring is similar to what one would expect for H II regions powered by stars of spectral types ranging between O9 and B0. The origin of the filamentary H-alpha and far-infrared luminosity interior to the star-forming ring is less clear, but it is almost certainly not produced by high mass stars.