论文标题
Starburst Galaxy NGC 1482中的分子气体流出
Molecular Gas Outflow in the Starburst Galaxy NGC 1482
论文作者
论文摘要
银河风对于调节星系中的恒星形成至关重要。为了研究风中分子气体的分布和动力学，我们使用Atacama大毫米/外部阵列以1''（$ \ \ y ot的100 $ pc）的分辨率（$ \ \ \ yournimeter/insimtimeter Array）以1''（$ \ your -of 100 $ pc）的分辨率成像了附近的Starburst Galaxy NGC 1482。在几乎边缘的磁盘中检测到分子气体，半径为3 kpc，并且从中央1 kpc starburst出现的双良好流出，并至少延伸至垂直于磁盘的1.5 kpc。在流出中，CO气体大约作为圆柱对称的包膜分布，周围是由H $α$和软X射线追踪的温暖和热离子气体。分子流出的速度，质量流出率和动能是$ v_ \ mathrm {w} \ sim100〜 \ mathrm {km〜s^{ - 1}} $， $ \ dot {m} _ \ mathrm {w} \ sim7〜m_ \ odot〜 \ mathrm {yr}^{ - 1} $，以及$ e_ \ mathrm {w} \ sim7 \ sim7 \ sim7 \ sim7 \ times10^{54} 〜4}〜\ mathrm {erg {erg {erg {erg {erg {erg {erg} $。 $ \ dot {m} _ \ mathrm {w} $可与恒星形成率（$ \ dot {m} _ \ mathrm {w}/\ mathrm {sfrm {sfr} \ sim2 $）和$ e_ \ e _ \ m m ins1 $ \ sim1 \ sim1 \ sim1 \ sim1 \ sim fef n of sim fef n of for $ 1 \ times10^7〜 \ mathrm {yr} $，这是流出的动态时间尺度。结果表明，风是驱动的。
Galactic winds are essential to regulation of star formation in galaxies. To study the distribution and dynamics of molecular gas in a wind, we imaged the nearby starburst galaxy NGC 1482 in CO ($J=1\rightarrow0$) at a resolution of 1'' ($\approx100$ pc) using the Atacama Large Millimeter/submillimeter Array. Molecular gas is detected in a nearly edge-on disk with a radius of 3 kpc and a biconical outflow emerging from the central 1 kpc starburst and extending to at least 1.5 kpc perpendicular to the disk. In the outflow, CO gas is distributed approximately as a cylindrically symmetrical envelope surrounding the warm and hot ionized gas traced by H$α$ and soft X-rays. The velocity, mass outflow rate, and kinetic energy of the molecular outflow are $v_\mathrm{w}\sim100~\mathrm{km~s^{-1}}$, $\dot{M}_\mathrm{w}\sim7~M_\odot~\mathrm{yr}^{-1}$, and $E_\mathrm{w}\sim7\times10^{54}~\mathrm{erg}$, respectively. $\dot{M}_\mathrm{w}$ is comparable to the star formation rate ($\dot{M}_\mathrm{w}/\mathrm{SFR}\sim2$) and $E_\mathrm{w}$ is $\sim1\%$ of the total energy released by stellar feedback in the past $1\times10^7~\mathrm{yr}$, which is the dynamical timescale of the outflow. The results indicate that the wind is starburst driven.
