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arXiv 1302.6451astro-ph.GA
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对高质量恒星形成区G29的Hi-GAL研究

A Hi-GAL study of the high-mass star-forming region G29.96-0.02

M. T. Beltran, L. Olmi, R. Cesaroni, E. Schisano, D. Elia, S. Molinari, A. M. Di Giorgio, J. M. Kirk, J. C. Mottram, M. Pestalozzi, L. Testi, M. A. Thompson

摘要:

上下文G29.96-0.02是一个在70、160、250、350和500微米处被观测到的高质量恒星形成云,是赫歇尔在科学演示阶段对银道面进行巡天的一部分。目标。我们希望通过估计它们的物理性质和演化阶段,并调查团簇质量函数,恒星形成效率和速率,对与该恒星形成区相关的源进行远红外研究。方法.我们已经确定了与云相关的Hi-GAL源,在厘米和红外波长处搜索了可能的对应物,拟合了它们的光谱能量分布并估计了它们的物理参数。结果在所有5个Hi-GAL波段中共检测到198个来源,其中117个与24微米发射相关,87个与24微米发射无关。我们称前者为24微米亮,后者为24微米暗。24微米暗光源的[70-160]色小于24微米亮光源的[70-160]色。24微米暗光源的L_bol和L_bol/M_env值低于24微米亮光源,说明它们处于较早的演化阶段。G29-SFR云与10个NVSS源有关,并与70微米发射很好地相关的扩展厘米连续发射。大多数NVSS源似乎是早期B型或晚期O型星。星云中质量最大、亮度最高的Hi-GAL源位于G29-UC区域附近,这表明在G29-SFR星云的中心有一个大质量恒星形成的特权区域。几乎所有的Hi-GAL源的质量都远高于金斯质量,但只有5%的质量高于维里质量,这表明大多数源对引力坍缩是稳定的。具有M_env > M_virial的源,并且...

英文摘要:

Context. G29.96-0.02 is a high-mass star-forming cloud observed at 70, 160, 250, 350, and 500 microns as part of the Herschel survey of the Galactic Plane during the Science Demonstration Phase. Aims. We wish to conduct a far-infrared study of the sources associated with this star-forming region by estimating their physical properties and evolutionary stage, and investigating the clump mass function, the star formation efficiency and rate in the cloud. Methods. We have identified the Hi-GAL sources associated with the cloud, searched for possible counterparts at centimeter and infrared wavelengths, fitted their spectral energy distribution and estimated their physical parameters. Results. A total of 198 sources have been detected in all 5 Hi-GAL bands, 117 of which are associated with 24 microns emission and 87 of which are not associated with 24 microns emission. We called the former sources 24 microns-bright and the latter ones 24 microns-dark. The [70-160] color of the 24 microns-dark sources is smaller than that of the 24 microns-bright ones. The 24 microns-dark sources have lower L_bol and L_bol/M_env than the 24 microns-bright ones for similar M_env, which suggests that they are in an earlier evolutionary phase. The G29-SFR cloud is associated with 10 NVSS sources and with extended centimeter continuum emission well correlated with the 70 microns emission. Most of the NVSS sources appear to be early B or late O-type stars. The most massive and luminous Hi-GAL sources in the cloud are located close to the G29-UC region, which suggests that there is a privileged area for massive star formation towards the center of the G29-SFR cloud. Almost all the Hi-GAL sources have masses well above the Jeans mass but only 5% have masses above the virial mass, which indicates that most of the sources are stable against gravitational collapse. The sources with M_env > M_virial and that ...

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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