论文标题

矮星银河系中的H II区域的运动学和反馈IC 10

Kinematics and Feedback in H II regions in the Dwarf Starburst Galaxy IC 10

论文作者

Cosens, Maren, Wright, Shelley A., Murray, Norman, Armus, Lee, Sandstrom, Karin, Do, Tuan, Larson, Kirsten, Martinez, Gregory, Sabhlok, Sanchit, Vayner, Andrey, Wiley, James

论文摘要

我们使用W. M. Keck天文台Keck Cosmic Web Imager(KCWI)以高光谱和空间分辨率进行了对最近的Starburst Galaxy,IC 10的中央区域的调查。我们绘制IC 10的中央星积,以采样单个恒星形成区域的运动学和电离特性。使用KCWI的低光谱分辨率模式,我们绘制氧气丰度,并使用高光谱分辨率模式,我们识别46个单独的H II区域。这些H II区域的平均半径为4.0 PC,星形率$ \ sim1.3 \ times10^{ - 4} $ m $ _ \ odot $ yr $^{ - 1} $和速度分散$ \ sim $ \ sim $ 16 km s $ s $ s $ s $^{ - 1} $。 H II区域似乎都没有被病毒($ \rmα_{vir} >> 1 $),并且平均而言,它们显示出正在进行的扩张的证据。 IC 10的H II区域与恒星形成区域尺寸稀疏度缩放关系以及与大小和速度分散相关的Larson定律所抵消。我们研究了内向和外部压力的余额,$ \ rm p_ {in} $和$ \ rm p_ {out} $,在89%的H II区域中找到$ \ rm p_ {out}> p_ {in} $,即使在这些低质量h II地区,也表明反馈驱动的扩展。我们发现温暖的气压($ \ rm p_ {gas} $)为向外压力提供了主要贡献($ \ rm p_ {out} $)。这抵消了内向压力,这是由于周围气体而不是自我重力所支配的。五个H II地区显示了流出的证据,这些证据很可能受到恒星风(2个地区)或香槟流(3个地区)的支持。这些观察结果为IC 10中的星形区域的状态提供了新的见解和低质量簇的负反馈。

We present a survey of the central region of the nearest starburst galaxy, IC 10, using the W. M. Keck Observatory Keck Cosmic Web Imager (KCWI) at high spectral and spatial resolution. We map the central starburst of IC 10 to sample the kinematic and ionization properties of the individual star-forming regions. Using the low spectral resolution mode of KCWI we map the oxygen abundance and with the high spectral resolution mode we identify 46 individual H II regions. These H II regions have an average radius of 4.0 pc, star formation rate $\sim1.3\times10^{-4}$ M$_\odot$ yr$^{-1}$, and velocity dispersion $\sim$16 km s$^{-1}$. None of the H II regions appear to be virialized ($\rm α_{vir}>>1$), and, on average, they show evidence of ongoing expansion. IC 10's H II regions are offset from the star forming region size-luminosity scaling relationships, as well as Larson's Law that relates size and velocity dispersion. We investigate the balance of inward and outward pressure, $\rm P_{in}$ and $\rm P_{out}$, finding $\rm P_{out}>P_{in}$ in 89% of H II regions, indicating feedback driven expansion even in these low mass H II regions. We find warm gas pressure ($\rm P_{gas}$) provides the dominant contribution to the outward pressure ($\rm P_{out}$). This counteracts the inward pressure which is dominated by turbulence in the surrounding gas rather than self-gravity. Five H II regions show evidence of outflows which are most likely supported by either stellar winds (2 regions) or champagne flows (3 regions). These observations provide new insights into the state of the star-forming regions in IC 10 and negative feedback from low mass clusters.

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