A Multiwavelength Look at Galactic Massive Star-forming Regions
A Multiwavelength Look at Galactic Massive Star-forming Regions
复制标题
银河系大质量恒星形成区域的多波长观察
DOI：
10.3847/1538-4357/aad7b2
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
M. Povich
中科院分区：
文献类型：
--
作者：
B. Binder;M. Povich
我们提出了28银河大质量恒星形成的H ii区域的多波长研究。对于其中的17个区域，我们提出了基于Gaia DR2视差的新距离测量方法。通过将多组分尘埃、黑体和幂律连续体模型拟合到3.6 μm到10 mm的光谱能量分布，我们发现大质量恒星发射的~ 34%的Lyman连续体光子在H区电离之前被尘埃吸收，而恒星热光度的~ 68%被H区和周围光解离区的尘埃吸收和再加工。与较不明亮的区域相比，最明亮的红外明亮区域（电离光子率NC≥1050 s−1，尘埃处理的LTIR≥106.8 L⊙）完全采样了上部恒星的初始质量函数（电离光子率NC≥1050 s−1），平均吸收莱曼连续谱光子的百分比（~ 51%）和再处理星光（~ 82%）更高。明亮的H ii区比不明亮的H ii区多环芳烃（PAH）的平均含量更低，这表明来自早型大质量恒星的强辐射场能够有效地破坏多环芳烃分子。平均而言，8、24和70 μm的单色光度合计携带94%的尘埃再处理LTIR。L70捕获了~ 52%的LTIR，因此是推断尘埃恒星形成区域的热光度的首选。我们根据L24和L70对每个区域的大质量恒星的Lyman连续光子速率校准了恒星形成速率（SFRs）。基于种群综合模型的单色SFRs的标准河外校准通常与我们的值一致。
We present a multiwavelength study of 28 Galactic massive star-forming H ii regions. For 17 of these regions, we present new distance measurements based on Gaia DR2 parallaxes. By fitting a multicomponent dust, blackbody, and power-law continuum model to the 3.6 μm through 10 mm spectral energy distributions, we find that ∼34% of Lyman continuum photons emitted by massive stars are absorbed by dust before contributing to the ionization of H ii regions, while ∼68% of the stellar bolometric luminosity is absorbed and reprocessed by dust in the H ii regions and surrounding photodissociation regions. The most luminous, infrared-bright regions that fully sample the upper stellar initial mass function (ionizing photon rates NC ≥ 1050 s−1 and dust-processed LTIR ≥ 106.8 L⊙) have on average higher percentages of absorbed Lyman continuum photons (∼51%) and reprocessed starlight (∼82%) compared to less luminous regions. Luminous H ii regions show lower average polycyclic aromatic hydrocarbon (PAH) fractions than less luminous regions, implying that the strong radiation fields from early-type massive stars are efficient at destroying PAH molecules. On average, the monochromatic luminosities at 8, 24, and 70 μm combined carry 94% of the dust-reprocessed LTIR. L70 captures ∼52% of LTIR, and is therefore the preferred choice to infer the bolometric luminosity of dusty star-forming regions. We calibrate star formation rates (SFRs) based on L24 and L70 against the Lyman continuum photon rates of the massive stars in each region. Standard extragalactic calibrations of monochromatic SFRs based on population synthesis models are generally consistent with our values.
登录
查看更多内容
大质量恒星的 VLT-FLAMES 巡天：NGC 3293、NGC 4755 和 NGC 6611 中的恒星参数和旋转速度
影响因子：
6.5
作者：
Dufton P
通讯作者：
Dufton P
影响因子：
6.5
作者：
K. Menten;M. Reid;J. Forbrich;J. Forbrich;A. Brunthaler
通讯作者：
K. Menten;M. Reid;J. Forbrich;J. Forbrich;A. Brunthaler
DOI：
10.1088/0004-637x/693/1/406
发表时间：
2008-11
期刊：
The Astrophysical Journal
影响因子：
--
作者：
L. Moscadelli;Mark J. Reid;K. Menten;A. Brunthaler;X. Zheng;Ye Xu;Ye Xu
通讯作者：
L. Moscadelli;Mark J. Reid;K. Menten;A. Brunthaler;X. Zheng;Ye Xu;Ye Xu
影响因子：
6.5
作者：
L. Hunt;B. Draine;S. Bianchi;K. Gordon;K. Gordon;G. Aniano;G. Aniano;D. Calzetti;D. Dale;G. Helou;J. Hinz;R. Kennicutt;H. Roussel;C. Wilson;A. Bolatto;M. Boquien;K. Croxall;M. Galametz;A. Paz;J. Koda;J. Muńoz-Mateos;K. Sandstrom;K. Sandstrom;M. Sauvage;L. Vigroux;S. Zibetti
通讯作者：
L. Hunt;B. Draine;S. Bianchi;K. Gordon;K. Gordon;G. Aniano;G. Aniano;D. Calzetti;D. Dale;G. Helou;J. Hinz;R. Kennicutt;H. Roussel;C. Wilson;A. Bolatto;M. Boquien;K. Croxall;M. Galametz;A. Paz;J. Koda;J. Muńoz-Mateos;K. Sandstrom;K. Sandstrom;M. Sauvage;L. Vigroux;S. Zibetti