用GHAFAS法布里-珀罗干涉仪在H-α发射中观察到的M83中供给核星暴的螺旋流入
Spiral inflow feeding the nuclear starburst in M83, observed in H-alpha emission with the GHAFAS Fabry-Perot interferometer
摘要：
我们目前的观测附近的酒吧星暴星系，M83（NGC 5236），与新的法布里-珀罗干涉仪GHAFAS安装在4.2米的威廉赫歇尔望远镜在拉帕尔马。前所未有的高分辨率观测，16 pc/FWHM，H-α发射气体覆盖了星系的中心2 kpc。速度场显示了主导盘旋转与签名的气体流入kpc尺度下的核区域。在主杆的内林德布拉德共振半径内，以主星系盘动力学中心d为中心，形成了一个尺度长度为$60 \pm 20$ pc的快速旋转的核$5.5 (\pm 0.9) \times 10^8 M_\odot$盘。核星爆在这个核盘的附近和内部都有发现，我们的观测证实，气体从外部螺旋进入，为核星爆提供能量，在M83中心100 pc半径范围内，在不同时期产生了几个恒星形成事件。
英文摘要：
We present observations of the nearby barred starburst galaxy, M83 (NGC5236), with the new Fabry-Perot interferometer GHAFAS mounted on the 4.2 meter William Herschel Telescope on La Palma. The unprecedented high resolution observations, of 16 pc/FWHM, of the H-alpha-emitting gas cover the central two kpc of the galaxy. The velocity field displays the dominant disk rotation with signatures of gas inflow from kpc scales down to the nuclear regions. At the inner Inner Lindblad Resonance radius of the main bar and centerd at the dynamical center of the main galaxy disk, a nuclear $5.5 (\pm 0.9) \times 10^8 M_\odot$ rapidly rotating disk with scale length of $60 \pm 20$ pc has formed. The nuclear starburst is found in the vicinity as well as inside this nuclear disk, and our observations confirm that gas spirals in from the outer parts to feed the nuclear starburst, giving rise to several star formation events at different epochs, within the central 100 pc radius of M83.
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