The PdBI Arcsecond Whirlpool Survey (PAWS): The Role of Spiral Arms in Cloud and Star Formation
The PdBI Arcsecond Whirlpool Survey (PAWS): The Role of Spiral Arms in Cloud and Star Formation
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PdBI 弧秒漩涡巡天 (PAWS)：旋臂在云和恒星形成中的作用
DOI：
10.3847/1538-4357/836/1/62
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
K. Schuster
中科院分区：
文献类型：
--
作者：
E. Schinnerer;S. Meidt;D. Colombo;R. Chandar;C. Dobbs;S. Garcia;A. Hughes;A. Leroy;J. Pety;M. Querejeta;C. Kramer;K. Schuster
沿着突出的旋臂观察到的明亮恒星形成点的形成过程仍然难以捉摸。我们介绍了对附近的大设计螺旋星系M51的螺旋臂段的多波长研究结果，该星系属于螺旋密度波，并具有9个气体杂散。利用恒星形成示踪剂（H ii区，<10 Myr的年轻星团）对（电离的，原子的，分子的，尘埃的）星际介质的综合观测表明：(1)巨分子云（GMC）性质在旋臂和气体热刺之间没有变化；(2)气体热刺和消光羽产生于相同的结构，气体热刺和正在/最近的恒星形成之间具有密切的空间关系（尽管旋臂中的气体表面密度更高）。(3)恒星形成年龄没有沿臂或沿鞭梢的趋势；(4)在气体鞭梢中存在强烈的恒星形成反馈的证据；(5)一个鞭梢的恒星反馈触发恒星形成的初步证据；(6)GMC关联不是特殊的实体，而是在低分辨率观测中气体臂/鞭梢截面混合的结果。我们得出的结论是，没有证据表明连贯的恒星形成开始机制可以单独与螺旋密度波的存在相关。这表明其他（更局部的）机制对于延迟恒星形成很重要，比如它发生在马刺中。恒星形成过程在单个热刺中持续了数百万年的证据表明，导致恒星形成的机制在更长的时间尺度上起作用或持续下去。
The process that leads to the formation of the bright star-forming sites observed along prominent spiral arms remains elusive. We present results of a multi-wavelength study of a spiral arm segment in the nearby grand-design spiral galaxy M51 that belongs to a spiral density wave and exhibits nine gas spurs. The combined observations of the (ionized, atomic, molecular, dusty) interstellar medium with star formation tracers (H ii regions, young <10 Myr stellar clusters) suggest (1) no variation in giant molecular cloud (GMC) properties between arm and gas spurs, (2) gas spurs and extinction feathers arising from the same structure with a close spatial relation between gas spurs and ongoing/recent star formation (despite higher gas surface densities in the spiral arm), (3) no trend in star formation age either along the arm or along a spur, (4) evidence for strong star formation feedback in gas spurs, (5) tentative evidence for star formation triggered by stellar feedback for one spur, and (6) GMC associations being not special entities but the result of blending of gas arm/spur cross sections in lower resolution observations. We conclude that there is no evidence for a coherent star formation onset mechanism that can be solely associated with the presence of the spiral density wave. This suggests that other (more localized) mechanisms are important to delay star formation such that it occurs in spurs. The evidence of star formation proceeding over several million years within individual spurs implies that the mechanism that leads to star formation acts or is sustained over a longer timescale.
PdBI 弧秒漩涡调查 (PAWS)：M51 中巨分子云特性的环境依赖性
DOI：
10.1088/0004-637x/784/1/3
发表时间：
2014
期刊：
The Astrophysical Journal
影响因子：
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作者：
Colombo;Hughes;Schinnerer
通讯作者：
Schinnerer
DOI：
10.1088/0004-637x/779/1/42
发表时间：
2013-04
期刊：
The Astrophysical Journal
影响因子：
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作者：
E. Schinnerer;S. Meidt;J. Pety;A. Hughes;D. Colombo;S. García-Burillo;K. Schuster;G. Dumas;C. Dobbs;A. Leroy;C. Kramer;T. Thompson;M. Regan
通讯作者：
E. Schinnerer;S. Meidt;J. Pety;A. Hughes;D. Colombo;S. García-Burillo;K. Schuster;G. Dumas;C. Dobbs;A. Leroy;C. Kramer;T. Thompson;M. Regan
DOI：
10.1088/0004-6256/141/2/41
发表时间：
2010-11
期刊：
The Astronomical Journal
影响因子：
--
作者：
G. Dumas;E. Schinnerer;F. Tabatabaei;R. Beck;T. Velusamy;E. Murphy
通讯作者：
G. Dumas;E. Schinnerer;F. Tabatabaei;R. Beck;T. Velusamy;E. Murphy