RCW 49 at Mid-Infrared Wavelengths: A GLIMPSE from the Spitzer Space Telescope
RCW 49 at Mid-Infrared Wavelengths: A GLIMPSE from the Spitzer Space Telescope
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中红外波长的 RCW 49：斯皮策太空望远镜的一瞥
DOI：
10.1086/422504
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Stolovy
中科院分区：
文献类型：
--
作者：
E. Churchwell;Barbara A. Whitney;B. Babler;R. Indebetouw;M. Meade;C. Watson;M. Wolff;M. Wolfire;T. Bania;Robert A. Benjamin;D. Clemens;M. Cohen;K. Devine;John M. Dickey;F. Heitsch;James M. Jackson;H. Kobulnicky;A. P. Marston;J. S. Mathis;E. P. Mercer;J. R. Stauffer;S. Stolovy
位于南银道面的明亮大质量星星形成区RCW 49是由斯皮策太空望远镜上的红外线阵列相机（IRAC）拍摄的，这是银河遗产红外线中面巡天计划（GLIMPSE）的一部分。IRAC谱带在3.3、6.2、7.7和8.6 μm处包含多环芳烃（PAH）特征以及Brα谱线。这些特征是RCW 49在IRAC波段中的漫发射的主要贡献者。斯皮策IRAC图像显示，RCW 49中的尘埃分布在一个由细丝、柱子、结、清晰的边界、气泡和弓形激波组成的网络中。电离星星团和W-R恒星周围的区域被恒星风和辐射抽空了尘埃。RCW 49的IRAC图像显示，RCW 49中的尘埃是由星云内部5′（内部1.66 pc）嵌入的发光恒星的风和辐射塑造的。当从中心电离星团投射的角半径θ> 5′时，方位平均红外强度福尔斯下降为θ-3。高分辨率的射电和中红外图像都表明该星云的密度沿着其西部边界。RCW 49中尘埃的丝状结构表明该星云的尘埃填充因子很小，因此整个星云的密度可能略微受限于H电离光子。
The luminous, massive star formation region RCW 49, located in the southern Galactic plane, was imaged with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope as part of the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) program. The IRAC bands contain polycyclic aromatic hydrocarbon (PAH) features at 3.3, 6.2, 7.7, and 8.6 μm, as well as the Brα line. These features are the major contributors to the diffuse emission from RCW 49 in the IRAC bands. The Spitzer IRAC images show that the dust in RCW 49 is distributed in a network of fine filaments, pillars, knots, sharply defined boundaries, bubbles, and bow shocks. The regions immediately surrounding the ionizing star cluster and W-R stars are evacuated of dust by stellar winds and radiation. The IRAC images of RCW 49 suggest that the dust in RCW 49 has been sculpted by the winds and radiation from the embedded luminous stars in the inner 5′ (inner ∼6 pc) of the nebula. At projected angular radii ϕ > 5′ from the central ionizing cluster, the azimuthally averaged infrared intensity falls off as ∼ϕ-3. Both high-resolution radio and mid-IR images suggest that the nebula is density bounded along its western boundary. The filamentary structure of the dust in RCW 49 suggests that the nebula has a small dust filling factor and, as a consequence, the entire nebula may be slightly density bounded to H-ionizing photons.
DOI：
10.1117/12.550744
发表时间：
2004-07
期刊：
--
影响因子：
--
作者：
G. Fazio;J. Hora;L. E. Allen;M. Ashby;P. Barmby;L. Deutsch;J.-S. Huang;S. Kleiner;M. Marengo-M.
通讯作者：
G. Fazio;J. Hora;L. E. Allen;M. Ashby;P. Barmby;L. Deutsch;J.-S. Huang;S. Kleiner;M. Marengo-M.