The Discovery of Young, Luminous, Compact Stellar Clusters in the Starburst Galaxy NGC 253
The Discovery of Young, Luminous, Compact Stellar Clusters in the Starburst Galaxy NGC 253
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在星爆星系 NGC 253 中发现年轻、发光、致密的星团
DOI：
10.1086/118032
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
J. Westphal
中科院分区：
文献类型：
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作者：
A. Watson;J. Gallagher;J. Holtzman;J. Hester;J. Mould;G. Ballester;C. Burrows;S. Casertano;J. Clarke;D. Crisp;R. Evans;R. Griffiths;J. Hoessel;P. Scowen;K. Stapelfeldt;J. Trauger;J. Westphal
我们报告发现了四个年轻的，明亮的，紧凑的恒星团在中央区域的
螺旋星系NGC 253其中一个星团的内禀M_v约为-15或更亮，
如果它具有类似于银河系球状星团的径向轮廓，则它的半光半径约为2.5秒差距。其他人
本征M_v约为-11或更亮，推断质量超过5 × 10^4 M_v，
紧凑.这些星团是年轻球状星团的绝佳候选者。较亮的星系团类似于
光度、推断的质量和致密性与在其他正在进行或最近强烈星星形成的地点发现的超级星星星团相当。这些星团位于星爆区域的中心，这表明强烈的星星形成可能是它们形成的关键因素。有迹象表明，这些候选的年轻球状星团可能正在以高频率形成。
We report the discovery of four young, luminous, compact stellar clusters in the central region of the
starburst spiral galaxy NGC 253. One cluster has an intrinsic M_v of about -15 or brighter, an inferred mass
in excess of 1.5X10^6 M_☉, assuming a Salpeter IMF from 0.08M_☉ to l00M_☉, and is resolved with a half-light radius of about 2.5 parsec if it has a radial profile similar to a Galactic globular cluster. The others
have intrinsic M_v of about -11 or brighter, inferred masses in excess of 5 X 10^4 M_☉, and are similarly
compact. These clusters are excellent candidate young globular clusters. The brighter cluster is similar in
luminosity, inferred mass, and compactness to the super star clusters found in other sites of ongoing or recent intense star formation. The location of these clusters in the midst of a starburst region suggests that intense star formation may be a key ingredient in their creation. There are hints that these candidate young globular clusters may be forming with a high specific frequency.